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[RFA] Linux Checkpoints, take 3


Fixups per Daniel and Eli.   Daniel,
1) Regarding register_raw_read, I just sidestepped the issue
and added a PC field to my saved context.
2) Regarding threads, I could make checkpoint_command refuse
if there are threads -- what's the best way to check that?
I could look at to_shortname, or better, I could add an
access method for the static variable "threaded" in linux-nat.

Mark, I'd still like to have your ok.

2005-12-19 Michael Snyder <msnyder@redhat.com>

	Checkpoint/Restart for Linux.
	* linux-nat.c: Add support for debugging multiple forks.
	Add #include for linux-fork.h (interface spec).
	(super_mourn_inferior): New function pointer.
	(child_mourn_inferior): New function / target method.
	(linux_target): Claim to_mourn_inferior method pointer.
	(child_follow_fork): Call interface to linux-fork, conditionally
	add new fork processes to list of debugged processes.
	(kill_inferior): Use interface to linux-fork to kill
	multiple processes.

	* linux-fork.h: New file.
	* linux-fork.c: New file.  Support for debugging multiple forks
	of the same program.  Support for checkpoint and restart commands.

* infrun.c (nullify_last_target_wait_ptid): New function.

	* Makefile.in: Add linux-fork.
	* config/i386/linux.mh: Add linux-fork.
	* doc/gdb.texinfo: Add documentation for linux-fork.
	* doc/gdbint.texinfo: Add internal documentation for checkpoints.
	* NEWS: Mention new functionality.

2005-12-19 Michael Van Meter Snyder <michsnyd@clwang-lnx.cisco.com>

	Add testing for checkpoint/restart and multiple fork debugging.
	* gdb.base/checkpoint.c: New file.
	* gdb.base/checkpoint.exp: New file.
	* gdb.base/multi-fork.c: New file.
	* gdb.base/multi-fork.exp: New file.
	* gdb.base/pi.txt: New file (data for checkpoint.c test).


Index: Makefile.in
===================================================================
RCS file: /cvs/src/src/gdb/Makefile.in,v
retrieving revision 1.766
diff -p -r1.766 Makefile.in
*** Makefile.in	22 Dec 2005 17:06:24 -0000	1.766
--- Makefile.in	23 Dec 2005 22:05:25 -0000
*************** MAKEOVERRIDES=
*** 1376,1382 ****
  
  ALLDEPFILES = \
  	aix-thread.c \
! 	alpha-nat.c alphabsd-nat.c alpha-linux-nat.c \
  	alpha-tdep.c alpha-linux-tdep.c alphabsd-tdep.c alphanbsd-tdep.c \
  	alpha-osf1-tdep.c alphafbsd-tdep.c alpha-mdebug-tdep.c \
  	amd64-nat.c amd64-tdep.c \
--- 1376,1382 ----
  
  ALLDEPFILES = \
  	aix-thread.c \
! 	alpha-nat.c alphabsd-nat.c alpha-linux-nat.c linux-fork.c \
  	alpha-tdep.c alpha-linux-tdep.c alphabsd-tdep.c alphanbsd-tdep.c \
  	alpha-osf1-tdep.c alphafbsd-tdep.c alpha-mdebug-tdep.c \
  	amd64-nat.c amd64-tdep.c \
*************** linespec.o: linespec.c $(defs_h) $(symta
*** 2179,2188 ****
  	$(symfile_h) $(objfiles_h) $(source_h) $(demangle_h) $(value_h) \
  	$(completer_h) $(cp_abi_h) $(parser_defs_h) $(block_h) \
  	$(objc_lang_h) $(linespec_h) $(exceptions_h)
  linux-nat.o: linux-nat.c $(defs_h) $(inferior_h) $(target_h) $(gdb_string_h) \
  	$(gdb_wait_h) $(gdb_assert_h) $(linux_nat_h) $(gdbthread_h) \
  	$(gdbcmd_h) $(regcache_h) $(inf_ptrace.h) $(auxv.h) $(elf_bfd_h) \
! 	$(gregset_h) $(gdbcore_h) $(gdbthread_h) $(gdb_stat_h)
  linux-thread-db.o: linux-thread-db.c $(defs_h) $(gdb_assert_h) \
  	$(gdb_proc_service_h) $(gdb_thread_db_h) $(bfd_h) $(exceptions_h) \
  	$(gdbthread_h) $(inferior_h) $(symfile_h) $(objfiles_h) $(target_h) \
--- 2179,2190 ----
  	$(symfile_h) $(objfiles_h) $(source_h) $(demangle_h) $(value_h) \
  	$(completer_h) $(cp_abi_h) $(parser_defs_h) $(block_h) \
  	$(objc_lang_h) $(linespec_h) $(exceptions_h)
+ linux-fork.o: linux-fork.c linux-fork.h $(defs_h) $(inferior_h) \
+ 	$(regcache_h) $(gdbcmd_h) $(infcall_h)
  linux-nat.o: linux-nat.c $(defs_h) $(inferior_h) $(target_h) $(gdb_string_h) \
  	$(gdb_wait_h) $(gdb_assert_h) $(linux_nat_h) $(gdbthread_h) \
  	$(gdbcmd_h) $(regcache_h) $(inf_ptrace.h) $(auxv.h) $(elf_bfd_h) \
! 	$(gregset_h) $(gdbcore_h) $(gdbthread_h) $(gdb_stat_h) linux-fork.h
  linux-thread-db.o: linux-thread-db.c $(defs_h) $(gdb_assert_h) \
  	$(gdb_proc_service_h) $(gdb_thread_db_h) $(bfd_h) $(exceptions_h) \
  	$(gdbthread_h) $(inferior_h) $(symfile_h) $(objfiles_h) $(target_h) \
Index: NEWS
===================================================================
RCS file: /cvs/src/src/gdb/NEWS,v
retrieving revision 1.181
diff -p -r1.181 NEWS
*** NEWS	8 Dec 2005 19:13:00 -0000	1.181
--- NEWS	23 Dec 2005 22:05:25 -0000
***************
*** 8,13 ****
--- 8,42 ----
  init-if-undefined		Initialize a convenience variable, but
  				only if it doesn't already have a value.
  
+ The following commands are presently only implemented for native GNU/Linux:
+ 
+ checkpoint			Save a snapshot of the program state.
+ 
+ restart	<n>			Return the program state to a 
+ 				previously saved state.
+ 
+ info checkpoints		List currently saved checkpoints.
+ 
+ delete-checkpoint <n>		Delete a previously saved checkpoint.
+ 
+ set|show detach-on-fork		Tell gdb whether to detach from a newly
+ 				forked process, or to keep debugging it.
+ 
+ info forks			List forks of the user program that
+ 				are available to be debugged.
+ 
+ fork <n>			Switch to debugging one of several
+ 				forks of the user program that are
+ 				available to be debugged.
+ 
+ delete-fork <n>			Delete a fork from the list of forks
+ 				that are available to be debugged (and
+ 				kill the forked process).
+ 
+ detach-fork <n>			Delete a fork from the list of forks
+ 				that are available to be debugged (and
+ 				allow the process to continue).
+ 
  * New architecture
  
  Morpho Technologies ms2		ms1-elf
Index: infrun.c
===================================================================
RCS file: /cvs/src/src/gdb/infrun.c,v
retrieving revision 1.208
diff -p -r1.208 infrun.c
*** infrun.c	17 Dec 2005 22:34:01 -0000	1.208
--- infrun.c	23 Dec 2005 22:05:28 -0000
*************** get_last_target_status (ptid_t *ptidp, s
*** 1102,1107 ****
--- 1102,1113 ----
    *status = target_last_waitstatus;
  }
  
+ void
+ nullify_last_target_wait_ptid (void)
+ {
+   target_last_wait_ptid = minus_one_ptid;
+ }
+ 
  /* Switch thread contexts, maintaining "infrun state". */
  
  static void
Index: linux-fork.c
===================================================================
RCS file: linux-fork.c
diff -N linux-fork.c
*** /dev/null	1 Jan 1970 00:00:00 -0000
--- linux-fork.c	23 Dec 2005 22:05:28 -0000
***************
*** 0 ****
--- 1,680 ----
+ /* GNU/Linux native-dependent code for debugging multiple forks.
+ 
+    Copyright 2005 Free Software Foundation, Inc.
+ 
+    This file is part of GDB.
+ 
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+ 
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+ 
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place - Suite 330,
+    Boston, MA 02111-1307, USA.  */
+ 
+ #include "defs.h"		/* Standard includes */
+ #include "inferior.h"
+ #include "regcache.h"		/* For regcache copy/restore */
+ #include "gdbcmd.h"
+ #include "infcall.h"		/* For call_function_by_hand */
+ #include "gdb_string.h"
+ #include "linux-fork.h"		/* External interface */
+ 
+ #include <sys/ptrace.h>
+ #include <sys/wait.h>
+ #include <sys/param.h>		/* For MAXPATHLEN */
+ #include <dirent.h>
+ #include <ctype.h>
+ 
+ struct fork_info *fork_list;
+ static int highest_fork_num;
+ 
+ int detach_fork = 1;		/* Default behavior is to detach
+ 				   newly forked processes (legacy).  */
+ 
+ /* Fork list data structure:  */
+ struct fork_info
+ {
+   struct fork_info *next;
+   ptid_t ptid;
+   int num;			/* Convenient handle (GDB fork id) */
+   struct regcache *savedregs;	/* Convenient for info fork, saves 
+ 				   having to actually switch contexts.  */
+   int clobber_regs;		/* True if we should restore saved regs.  */
+   ULONGEST pc;			/* PC for info fork.  */
+   off_t *filepos;		/* Set of open file descriptors' offsets.  */
+   int maxfd;
+ };
+ 
+ /* Fork list methods:  */
+ 
+ /* Add a fork to internal fork list.
+    Called from linux child_follow_fork.  */
+ 
+ extern struct fork_info *
+ add_fork (pid_t pid)
+ {
+   struct fork_info *fp;
+ 
+   if (fork_list == NULL &&
+       pid != PIDGET (inferior_ptid))
+     {
+       /* Special case -- if this is the first fork in the list
+ 	 (the list is hitherto empty), and if this new fork is
+ 	 NOT the current inferior_ptid, then add inferior_ptid
+ 	 first, as a special zeroeth fork id.  */
+       highest_fork_num = -1;
+       add_fork (PIDGET (inferior_ptid));	/* safe recursion */
+     }
+ 
+   fp = XZALLOC (struct fork_info);
+   fp->ptid = pid_to_ptid (pid);
+   fp->num = ++highest_fork_num;
+   fp->next = fork_list;
+   fork_list = fp;
+   return fp;
+ }
+ 
+ static void
+ free_fork (struct fork_info *fp)
+ {
+   /* Notes on step-resume breakpoints: since this is a concern for
+      threads, let's convince ourselves that it's not a concern for
+      forks.  There are two ways for a fork_info to be created.  First,
+      by the checkpoint command, in which case we're at a gdb prompt
+      and there can't be any step-resume breakpoint.  Second, by a fork
+      in the user program, in which case we *may* have stepped into the
+      fork call, but regardless of whether we follow the parent or the
+      child, we will return to the same place and the step-resume
+      breakpoint, if any, will take care of itself as usual.  And
+      unlike threads, we do not save a private copy of the step-resume
+      breakpoint -- so we're OK.  */
+ 
+   if (fp)
+     {
+       if (fp->savedregs)
+ 	regcache_xfree (fp->savedregs);
+       if (fp->filepos)
+ 	xfree (fp->filepos);
+       xfree (fp);
+     }
+ }
+ 
+ static void
+ delete_fork (ptid_t ptid)
+ {
+   struct fork_info *fp, *fpprev;
+ 
+   fpprev = NULL;
+ 
+   for (fp = fork_list; fp; fpprev = fp, fp = fp->next)
+     if (ptid_equal (fp->ptid, ptid))
+       break;
+ 
+   if (!fp)
+     return;
+ 
+   if (fpprev)
+     fpprev->next = fp->next;
+   else
+     fork_list = fp->next;
+ 
+   free_fork (fp);
+ 
+   /* Special case: if there is now only one process in the list, 
+      and if it is (hopefully!) the current inferior_ptid, then
+      remove it, leaving the list empty -- we're now down to the
+      default case of debugging a single process.  */
+   if (fork_list != NULL && fork_list->next == NULL &&
+       ptid_equal (fork_list->ptid, inferior_ptid))
+     {
+       /* Last fork -- delete from list and handle as solo process
+ 	 (should be a safe recursion).  */
+       delete_fork (inferior_ptid);
+     }
+ }
+ 
+ /* Find a fork_info by matching PTID.  */
+ static struct fork_info *
+ find_fork_ptid (ptid_t ptid)
+ {
+   struct fork_info *fp;
+ 
+   for (fp = fork_list; fp; fp = fp->next)
+     if (ptid_equal (fp->ptid, ptid))
+       return fp;
+ 
+   return NULL;
+ }
+ 
+ /* Find a fork_info by matching ID.  */
+ static struct fork_info *
+ find_fork_id (int num)
+ {
+   struct fork_info *fp;
+ 
+   for (fp = fork_list; fp; fp = fp->next)
+     if (fp->num == num)
+       return fp;
+ 
+   return NULL;
+ }
+ 
+ /* Find a fork_info by matching pid.  */
+ extern struct fork_info *
+ find_fork_pid (pid_t pid)
+ {
+   struct fork_info *fp;
+ 
+   for (fp = fork_list; fp; fp = fp->next)
+     if (pid == ptid_get_pid (fp->ptid))
+       return fp;
+ 
+   return NULL;
+ }
+ 
+ static ptid_t
+ fork_id_to_ptid (int num)
+ {
+   struct fork_info *fork = find_fork_id (num);
+   if (fork)
+     return fork->ptid;
+   else
+     return pid_to_ptid (-1);
+ }
+ 
+ static void
+ init_fork_list (void)
+ {
+   struct fork_info *fp, *fpnext;
+ 
+   if (!fork_list)
+     return;
+ 
+   for (fp = fork_list; fp; fp = fpnext)
+     {
+       fpnext = fp->next;
+       free_fork (fp);
+     }
+ 
+   fork_list = NULL;
+ }
+ 
+ /* Fork list <-> gdb interface.  */
+ 
+ /* call_lseek -- utility function for fork_load/fork_save.  
+    Calls lseek in the (current) inferior process.  */
+ static off_t
+ call_lseek (int fd, off_t offset, int whence)
+ {
+   char exp[80];
+ 
+   snprintf (&exp[0], sizeof (exp), "lseek (%d, %ld, %d)",
+ 	    fd, (long) offset, whence);
+   return (off_t) parse_and_eval_long (&exp[0]);
+ }
+ 
+ /* Load infrun state for the fork PTID.  */
+ 
+ static void
+ fork_load_infrun_state (struct fork_info *fp)
+ {
+   extern void nullify_last_target_wait_ptid ();
+   int i;
+ 
+   if (fp->savedregs && fp->clobber_regs)
+     regcache_cpy (current_regcache, fp->savedregs);
+ 
+   nullify_last_target_wait_ptid ();
+ 
+   /* Now restore the file positions of open file descriptors.  */
+   if (fp->filepos)
+     {
+       for (i = 0; i <= fp->maxfd; i++)
+ 	if (fp->filepos[i] != (off_t) -1)
+ 	  call_lseek (i, fp->filepos[i], SEEK_SET);
+       /* NOTE: I can get away with using SEEK_SET and SEEK_CUR because
+ 	 this is native-only.  If it ever has to be cross, we'll have
+ 	 to rethink this.  */
+     }
+ }
+ 
+ /* Save infrun state for the fork PTID.
+    Exported for use by linux child_follow_fork.  */
+ 
+ extern void
+ fork_save_infrun_state (struct fork_info *fp, int clobber_regs)
+ {
+   char path[MAXPATHLEN];
+   struct dirent *de;
+   DIR *d;
+ 
+   if (fp->savedregs)
+     regcache_xfree (fp->savedregs);
+ 
+   fp->savedregs = regcache_dup (current_regcache);
+   fp->clobber_regs = clobber_regs;
+   fp->pc = read_pc ();
+ 
+   if (clobber_regs)
+     {
+       /* Now save the 'state' (file position) of all open file descriptors.
+ 	 Unfortunately fork does not take care of that for us...  */
+       snprintf (path, MAXPATHLEN, "/proc/%ld/fd", (long) PIDGET (fp->ptid));
+       if ((d = opendir (path)) != NULL)
+ 	{
+ 	  long tmp;
+ 
+ 	  fp->maxfd = 0;
+ 	  while ((de = readdir (d)) != NULL)
+ 	    {
+ 	      /* Count open file descriptors (actually find highest
+ 		 numbered).  */
+ 	      tmp = strtol (&de->d_name[0], NULL, 10);
+ 	      if (fp->maxfd < tmp)
+ 		fp->maxfd = tmp;
+ 	    }
+ 	  /* Allocate array of file positions.  */
+ 	  fp->filepos = xrealloc (fp->filepos, 
+ 				  (fp->maxfd + 1) * sizeof (*fp->filepos));
+ 
+ 	  /* Initialize to -1 (invalid).  */
+ 	  for (tmp = 0; tmp <= fp->maxfd; tmp++)
+ 	    fp->filepos[tmp] = -1;
+ 
+ 	  /* Now find actual file positions.  */
+ 	  rewinddir (d);
+ 	  while ((de = readdir (d)) != NULL)
+ 	    if (isdigit (de->d_name[0]))
+ 	      {
+ 		tmp = strtol (&de->d_name[0], NULL, 10);
+ 		fp->filepos[tmp] = call_lseek (tmp, 0, SEEK_CUR);
+ 	      }
+ 	  closedir (d);
+ 	}
+     }
+ }
+ 
+ /* linux_fork_killall.  Let God sort 'em out...  */
+ 
+ extern void
+ linux_fork_killall (void)
+ {
+   /* Walk list and kill every pid.  No need to treat the
+      current inferior_ptid as special (we do not return a
+      status for it) -- however any process may be a child
+      or a parent, so may get a SIGCHLD from a previously
+      killed child.  Wait them all out.  */
+   pid_t pid, ret;
+   int status;
+ 
+   do {
+     pid = PIDGET (fork_list->ptid);
+     do {
+       ptrace (PT_KILL, pid, 0, 0);
+       ret = waitpid (pid, &status, 0);
+     } while (ret == pid && WIFSTOPPED (status));
+     delete_fork (fork_list->ptid);
+   } while (fork_list != NULL);
+ }
+ 
+ /* linux_fork_mourn_inferior.  The current inferior_ptid has exited,
+    but there are other viable forks to debug.  Delete the exiting one
+    and context-switch to the first available.  */
+ 
+ extern void
+ linux_fork_mourn_inferior (void)
+ {
+   /* Wait just one more time to collect the inferior's exit status.
+      Do not check whether this succeeds though, since we may be
+      dealing with a process that we attached to.  Such a process will
+      only report its exit status to its original parent.  */
+   int status;
+ 
+   waitpid (ptid_get_pid (inferior_ptid), &status, 0);
+ 
+   /* OK, presumably inferior_ptid is the one who has exited.
+      We need to delete that one from the fork_list, and switch
+      to the next available fork.  */
+   delete_fork (inferior_ptid);
+   if (fork_list)	/* Paranoia, shouldn't happen.  */
+     {
+       inferior_ptid = fork_list[0].ptid;
+       printf_filtered (_("[Switching to %s]\n"), 
+ 		       target_pid_to_str (inferior_ptid));
+     }
+ }
+ 
+ /* Fork list <-> user interface.  */
+ 
+ static void
+ delete_fork_command (char *args, int from_tty)
+ {
+   ptid_t ptid;
+ 
+   if (!args || !*args)
+     error (_("Requires argument (fork/checkpoint id to delete)"));
+ 
+   ptid = fork_id_to_ptid (parse_and_eval_long (args));
+   if (ptid_equal (ptid, minus_one_ptid))
+     error (_("No such fork/checkpoint id, %s"), args);
+ 
+   if (ptid_equal (ptid, inferior_ptid))
+     error (_("Please switch to another fork/checkpoint before deleting the current one"));
+ 
+   if (ptrace (PTRACE_KILL, ptid, 0, 0))
+     error (_("Unable to kill pid %s"), target_tid_to_str (ptid));
+ 
+   if (from_tty)
+     printf_filtered (_("Killed %s\n"), target_pid_to_str (ptid));
+ 
+   delete_fork (ptid);
+ }
+ 
+ static void
+ detach_fork_command (char *args, int from_tty)
+ {
+   ptid_t ptid;
+ 
+   if (!args || !*args)
+     error (_("Requires argument (fork id to detach)"));
+ 
+   ptid = fork_id_to_ptid (parse_and_eval_long (args));
+   if (ptid_equal (ptid, minus_one_ptid))
+     error (_("No such fork id, %s"), args);
+ 
+   if (ptid_equal (ptid, inferior_ptid))
+     error (_("Please switch to another fork before detaching the current one"));
+ 
+   if (ptrace (PTRACE_DETACH, ptid, 0, 0))
+     error (_("Unable to detach %s"), target_pid_to_str (ptid));
+ 
+   if (from_tty)
+     printf_filtered (_("Detached %s\n"), target_pid_to_str (ptid));
+ 
+   delete_fork (ptid);
+ }
+ 
+ /* Print information about currently known forks.  */
+ 
+ static void
+ info_forks_command (char *arg, int from_tty)
+ {
+   struct frame_info *cur_frame;
+   struct symtab_and_line sal;
+   struct symtab *cur_symtab;
+   struct fork_info *fp;
+   int cur_line;
+   ULONGEST pc;
+ 
+   for (fp = fork_list; fp; fp = fp->next)
+     {
+       if (ptid_equal (fp->ptid, inferior_ptid))
+ 	{
+ 	  printf_filtered ("* ");
+ 	  pc = read_pc ();
+ 	}
+       else
+ 	{
+ 	  printf_filtered ("  ");
+ 	  pc = fp->pc;
+ 	}
+       printf_filtered ("%d %s", fp->num, target_pid_to_str (fp->ptid));
+       if (fp->num == 0)
+ 	printf_filtered (_(" (main process)"));
+       printf_filtered (_(" at "));
+       deprecated_print_address_numeric (pc, 1, gdb_stdout);
+ 
+       sal = find_pc_line (pc, 0);
+       if (sal.symtab)
+ 	{
+ 	  char *tmp = strrchr (sal.symtab->filename, '/');
+ 
+ 	  if (tmp)
+ 	    printf_filtered (_(", file %s"), tmp + 1);
+ 	  else
+ 	    printf_filtered (_(", file %s"), sal.symtab->filename);
+ 	}
+       if (sal.line)
+ 	printf_filtered (_(", line %d"), sal.line);
+       if (!sal.symtab && !sal.line)
+ 	{
+ 	  struct minimal_symbol *msym;
+ 
+ 	  msym = lookup_minimal_symbol_by_pc (pc);
+ 	  if (msym)
+ 	    printf_filtered (", <%s>", SYMBOL_LINKAGE_NAME (msym));
+ 	}
+ 
+       putchar_filtered ('\n');
+     }
+ }
+ 
+ /* Save/restore mode variable 'detach_fork':
+    We need to temporarily take over this mode variable, while
+    preserving the user-specified state, and make sure that it 
+    gets restored in case of error.
+ 
+    The int pointer that we use comes from the caller, so we can
+    be called more than once (even though currently we don't need to).  */
+ 
+ static void 
+ restore_detach_fork (void *arg)
+ {
+   detach_fork = *(int *) arg;
+ }
+ 
+ static struct cleanup *
+ save_detach_fork (int *saved_val)
+ {
+   *saved_val = detach_fork;
+   return make_cleanup (restore_detach_fork, (void *) saved_val);
+ }
+ 
+ static void
+ checkpoint_command (char *args, int from_tty)
+ {
+   struct target_waitstatus last_target_waitstatus;
+   ptid_t last_target_ptid;
+   struct value *fork_fn = NULL, *ret;
+   struct fork_info *fp;
+   pid_t retpid;
+   struct cleanup *old_chain;
+   long i;
+   /* Make this temp var static, 'cause it's used in the error context.  */
+   static int temp_detach_fork;
+ 
+   /* Make the inferior fork, record its (and gdb's) state.  */
+ 
+   if (lookup_minimal_symbol ("fork", NULL, NULL) != NULL)
+     fork_fn = find_function_in_inferior ("fork");
+   if (!fork_fn)
+     if (lookup_minimal_symbol ("_fork", NULL, NULL) != NULL)
+       fork_fn = find_function_in_inferior ("fork");
+   if (!fork_fn)
+     error (_("checkpoint: can't find fork function in inferior."));
+ 
+   ret = value_from_longest (builtin_type_int, 0);
+   old_chain = save_detach_fork (&temp_detach_fork);
+   detach_fork = 0;
+   ret = call_function_by_hand (fork_fn, 0, &ret);
+   do_cleanups (old_chain);
+   if (!ret)	/* Probably can't happen.  */
+     error (_("checkpoint: call_function_by_hand returned null."));
+ 
+   retpid = value_as_long (ret);
+   get_last_target_status (&last_target_ptid, &last_target_waitstatus);
+   if (from_tty)
+     {
+       int parent_pid;
+ 
+       printf_filtered (_("checkpoint: fork returned pid %ld.\n"), 
+ 		       (long) retpid);
+       if (info_verbose)
+ 	{
+ 	  parent_pid = ptid_get_lwp (last_target_ptid);
+ 	  if (parent_pid == 0)
+ 	    parent_pid = ptid_get_pid (last_target_ptid);
+ 	  printf_filtered (_("   gdb says parent = %ld.\n"), 
+ 			   (long) parent_pid);
+ 	}
+     }
+ 
+   fp = find_fork_pid (retpid);
+   if (!fp)
+     error (_("Failed to find new fork"));
+   fork_save_infrun_state (fp, 1);
+ }
+ 
+ static void
+ linux_fork_context (struct fork_info *newfp, int from_tty)
+ {
+   /* Now we attempt to switch processes.  */
+   struct fork_info *oldfp = find_fork_ptid (inferior_ptid);
+   ptid_t ptid;
+   int id, i;
+ 
+   if (!newfp)
+     error (_("No such fork/process"));
+ 
+   if (!oldfp)
+     {
+       oldfp = add_fork (ptid_get_pid (inferior_ptid));
+     }
+ 
+   fork_save_infrun_state (oldfp, 1);
+   inferior_ptid = newfp->ptid;
+   fork_load_infrun_state (newfp);
+   registers_changed ();
+   reinit_frame_cache ();
+   stop_pc = read_pc ();
+   select_frame (get_current_frame ());
+ 
+   printf_filtered (_("Switching to %s\n"), 
+ 		   target_pid_to_str (inferior_ptid));
+ 
+   print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC);
+ }
+ 
+ /* Switch inferior process (fork) context, by process id.  */
+ static void
+ process_command (char *args, int from_tty)
+ {
+   struct fork_info *fp;
+ 
+   if (!args || !*args)
+     error (_("Requires argument (process id to switch to)"));
+ 
+   if ((fp = find_fork_pid (parse_and_eval_long (args))) == NULL)
+     error (_("Not found: process id %s"), args);
+ 
+   linux_fork_context (fp, from_tty);
+ }
+ 
+ /* Switch inferior process (fork) context, by fork id.  */
+ static void
+ fork_command (char *args, int from_tty)
+ {
+   struct fork_info *fp;
+ 
+   if (!args || !*args)
+     error (_("Requires argument (fork id to switch to)"));
+ 
+   if ((fp = find_fork_id (parse_and_eval_long (args))) == NULL)
+     error (_("Not found: fork id %s"), args);
+ 
+   linux_fork_context (fp, from_tty);
+ }
+ 
+ /* Switch inferior process (fork) context, by checkpoint id.  */
+ static void
+ restart_command (char *args, int from_tty)
+ {
+   struct fork_info *fp;
+ 
+   if (!args || !*args)
+     error (_("Requires argument (checkpoint id to restart)"));
+ 
+   if ((fp = find_fork_id (parse_and_eval_long (args))) == NULL)
+     error (_("Not found: checkpoint id %s"), args);
+ 
+   linux_fork_context (fp, from_tty);
+ }
+ 
+ /* Extern because called from core gdb.  */
+ extern void
+ _initialize_linux_fork (void)
+ {
+   init_fork_list ();
+ 
+   /* Set/show detach-on-fork: user-settable mode.  */
+ 
+   add_setshow_boolean_cmd ("detach-on-fork", class_obscure, &detach_fork, _("\
+ Set whether gdb will detach the child of a fork."), _("\
+ Show whether gdb will detach the child of a fork."), _("\
+ Tells gdb whether to detach the child of a fork."), 
+ 			   NULL, NULL, &setlist, &showlist);
+ 
+   /* Set/show restart-auto-finish: user-settable count.  Causes the
+      first "restart" of a fork to do some number of "finish" commands
+      before returning to user.
+ 
+      Useful because otherwise the virgin fork process will be stopped
+      somewhere in the un-interesting fork system call.  */
+ 
+   /* Checkpoint command: create a fork of the inferior process
+      and set it aside for later debugging.  */
+ 
+   add_com ("checkpoint", class_obscure, checkpoint_command, _("\
+ Fork a duplicate process (experimental)."));
+ 
+   /* Restart command: restore the context of a specified fork
+      process.  May be used for "program forks" as well as for
+      "debugger forks" (checkpoints).  */
+ 
+   add_com ("restart", class_obscure, restart_command, _("\
+ restart <n>: restore program context from a checkpoint.\n\
+ Argument 'n' is checkpoint ID, as displayed by 'info checkpoints'."));
+ 
+   /* Delete-checkpoint command: kill the process and remove it from
+      fork list.  */
+ 
+   add_com ("delete-checkpoint", class_obscure, delete_fork_command, _("\
+ Delete a fork/checkpoint (experimental)."));
+ 
+   /* Detach-checkpoint command: release the process to run independantly, 
+      and remove it from the fork list.  */
+ 
+   add_com ("detach-checkpoint", class_obscure, detach_fork_command, _("\
+ Detach from a fork/checkpoint (experimental)."));
+ 
+   /* Info checkpoints command: list all forks/checkpoints 
+      currently under gdb's control.  */
+ 
+   add_info ("checkpoints", info_forks_command,
+ 	    _("IDs of currently known forks/checkpoints."));
+ 
+   /* Command aliases (let "fork" and "checkpoint" be used 
+      interchangeably).  */
+ 
+   add_com_alias ("delete-fork", "delete-checkpoint", class_obscure, 1);
+   add_com_alias ("detach-fork", "detach-checkpoint", class_obscure, 1);
+   add_info_alias ("forks", "checkpoints", 0);
+ 
+   /* "fork <n>" (by analogy to "thread <n>").  */
+   add_com ("fork", class_obscure, fork_command, _("\
+ fork <n>: Switch between forked processes.\n\
+ Argument 'n' is fork ID, as displayed by 'info forks'."));
+ 
+   /* "process <proc id>" as opposed to "fork <fork id>".  */
+   add_com ("process", class_obscure, process_command, _("\
+ process <pid>: Switch between forked processes.\n\
+ Argument 'pid' is process ID, as displayed by 'info forks' or 'shell ps'."));
+ }
Index: linux-fork.h
===================================================================
RCS file: linux-fork.h
diff -N linux-fork.h
*** /dev/null	1 Jan 1970 00:00:00 -0000
--- linux-fork.h	23 Dec 2005 22:05:28 -0000
***************
*** 0 ****
--- 1,33 ----
+ /* GNU/Linux native-dependent code for debugging multiple forks.
+ 
+    Copyright 2005 Free Software Foundation, Inc.
+ 
+    This file is part of GDB.
+ 
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+ 
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+ 
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place - Suite 330,
+    Boston, MA 02111-1307, USA.  */
+ 
+ struct fork_info;
+ extern struct fork_info *add_fork (pid_t);
+ extern struct fork_info *find_fork_pid (pid_t);
+ extern void fork_save_infrun_state (struct fork_info *, int);
+ extern void linux_fork_killall (void);
+ extern void linux_fork_mourn_inferior (void);
+ 
+ struct fork_info *fork_list;
+ #define FORKS_EXIST()	(fork_list != NULL)
+ 
+ extern int detach_fork;
+ 
Index: linux-nat.c
===================================================================
RCS file: /cvs/src/src/gdb/linux-nat.c,v
retrieving revision 1.35
diff -p -r1.35 linux-nat.c
*** linux-nat.c	17 Dec 2005 22:34:01 -0000	1.35
--- linux-nat.c	23 Dec 2005 22:05:29 -0000
***************
*** 31,36 ****
--- 31,37 ----
  #endif
  #include <sys/ptrace.h>
  #include "linux-nat.h"
+ #include "linux-fork.h"
  #include "gdbthread.h"
  #include "gdbcmd.h"
  #include "regcache.h"
***************
*** 87,98 ****
     the use of the multi-threaded target.  */
  static struct target_ops *linux_ops;
  
! /* The saved to_xfer_partial method, inherited from inf-ptrace.c.  Called
!    by our to_xfer_partial.   */
! static LONGEST (*super_xfer_partial) (struct target_ops *, enum target_object,
! 				      const char *, gdb_byte *, const gdb_byte *,
  				      ULONGEST, LONGEST);
  
  static int debug_linux_nat;
  static void
  show_debug_linux_nat (struct ui_file *file, int from_tty,
--- 88,105 ----
     the use of the multi-threaded target.  */
  static struct target_ops *linux_ops;
  
! /* The saved to_xfer_partial method, inherited from inf-ptrace.c.
!    Called by our to_xfer_partial.  */
! static LONGEST (*super_xfer_partial) (struct target_ops *, 
! 				      enum target_object,
! 				      const char *, gdb_byte *, 
! 				      const gdb_byte *,
  				      ULONGEST, LONGEST);
  
+ /* The saved to_mourn_inferior method, inherited from inf-ptrace.c.
+    Called by our to_mourn_inferior.  */
+ static void (*super_mourn_inferior) (void);
+ 
  static int debug_linux_nat;
  static void
  show_debug_linux_nat (struct ui_file *file, int from_tty,
*************** child_follow_fork (struct target_ops *op
*** 363,377 ****
  	 also, but they'll be reinserted below.  */
        detach_breakpoints (child_pid);
  
!       if (debug_linux_nat)
  	{
! 	  target_terminal_ours ();
! 	  fprintf_unfiltered (gdb_stdlog,
! 			      "Detaching after fork from child process %d.\n",
! 			      child_pid);
! 	}
  
!       ptrace (PTRACE_DETACH, child_pid, 0, 0);
  
        if (has_vforked)
  	{
--- 370,397 ----
  	 also, but they'll be reinserted below.  */
        detach_breakpoints (child_pid);
  
!       /* Detach new forked process?  */
!       if (detach_fork)
  	{
! 	  if (debug_linux_nat)
! 	    {
! 	      target_terminal_ours ();
! 	      fprintf_filtered (gdb_stdlog,
! 				"Detaching after fork from child process %d.\n",
! 				child_pid);
! 	    }
  
! 	  ptrace (PTRACE_DETACH, child_pid, 0, 0);
! 	}
!       else
! 	{
! 	  struct fork_info *fp;
! 	  /* Retain child fork in ptrace (stopped) state.  */
! 	  fp = find_fork_pid (child_pid);
! 	  if (!fp)
! 	    fp = add_fork (child_pid);
! 	  fork_save_infrun_state (fp, 0);
! 	}
  
        if (has_vforked)
  	{
*************** child_follow_fork (struct target_ops *op
*** 441,449 ****
        if (debug_linux_nat)
  	{
  	  target_terminal_ours ();
! 	  fprintf_unfiltered (gdb_stdlog,
! 			      "Attaching after fork to child process %d.\n",
! 			      child_pid);
  	}
  
        /* If we're vforking, we may want to hold on to the parent until
--- 461,469 ----
        if (debug_linux_nat)
  	{
  	  target_terminal_ours ();
! 	  fprintf_filtered (gdb_stdlog,
! 			    "Attaching after fork to child process %d.\n",
! 			    child_pid);
  	}
  
        /* If we're vforking, we may want to hold on to the parent until
*************** child_follow_fork (struct target_ops *op
*** 466,478 ****
  
        if (has_vforked)
  	linux_parent_pid = parent_pid;
        else
! 	target_detach (NULL, 0);
  
        inferior_ptid = pid_to_ptid (child_pid);
  
        /* Reinstall ourselves, since we might have been removed in
  	 target_detach (which does other necessary cleanup).  */
        push_target (ops);
  
        /* Reset breakpoints in the child as appropriate.  */
--- 486,510 ----
  
        if (has_vforked)
  	linux_parent_pid = parent_pid;
+       else if (!detach_fork)
+ 	{
+ 	  struct fork_info *fp;
+ 	  /* Retain parent fork in ptrace (stopped) state.  */
+ 	  fp = find_fork_pid (parent_pid);
+ 	  if (!fp)
+ 	    fp = add_fork (parent_pid);
+ 	  fork_save_infrun_state (fp, 0);
+ 	}
        else
! 	{
! 	  target_detach (NULL, 0);
! 	}
  
        inferior_ptid = pid_to_ptid (child_pid);
  
        /* Reinstall ourselves, since we might have been removed in
  	 target_detach (which does other necessary cleanup).  */
+ 
        push_target (ops);
  
        /* Reset breakpoints in the child as appropriate.  */
*************** kill_inferior (void)
*** 579,611 ****
    if (pid == 0)
      return;
  
!   /* If we're stopped while forking and we haven't followed yet, kill the
!      other task.  We need to do this first because the parent will be
!      sleeping if this is a vfork.  */
! 
!   get_last_target_status (&last_ptid, &last);
! 
!   if (last.kind == TARGET_WAITKIND_FORKED
!       || last.kind == TARGET_WAITKIND_VFORKED)
      {
!       ptrace (PT_KILL, last.value.related_pid, 0, 0);
!       wait (&status);
      }
  
!   /* Kill the current process.  */
!   ptrace (PT_KILL, pid, 0, 0);
!   ret = wait (&status);
  
!   /* We might get a SIGCHLD instead of an exit status.  This is
!      aggravated by the first kill above - a child has just died.  */
  
!   while (ret == pid && WIFSTOPPED (status))
!     {
        ptrace (PT_KILL, pid, 0, 0);
        ret = wait (&status);
-     }
  
!   target_mourn_inferior ();
  }
  
  /* On GNU/Linux there are no real LWP's.  The closest thing to LWP's
--- 611,652 ----
    if (pid == 0)
      return;
  
!   /* First cut -- let's crudely do everything inline.  */
!   if (FORKS_EXIST ())
      {
!       linux_fork_killall ();
!       pop_target ();
!       generic_mourn_inferior ();
      }
+   else
+     {
+       /* If we're stopped while forking and we haven't followed yet,
+ 	 kill the other task.  We need to do this first because the
+ 	 parent will be sleeping if this is a vfork.  */
  
!       get_last_target_status (&last_ptid, &last);
  
!       if (last.kind == TARGET_WAITKIND_FORKED
! 	  || last.kind == TARGET_WAITKIND_VFORKED)
! 	{
! 	  ptrace (PT_KILL, last.value.related_pid, 0, 0);
! 	  wait (&status);
! 	}
  
!       /* Kill the current process.  */
        ptrace (PT_KILL, pid, 0, 0);
        ret = wait (&status);
  
!       /* We might get a SIGCHLD instead of an exit status.  This is
! 	 aggravated by the first kill above - a child has just died.  */
! 
!       while (ret == pid && WIFSTOPPED (status))
! 	{
! 	  ptrace (PT_KILL, pid, 0, 0);
! 	  ret = wait (&status);
! 	}
!       target_mourn_inferior ();
!     }
  }
  
  /* On GNU/Linux there are no real LWP's.  The closest thing to LWP's
*************** select_event_lwp (struct lwp_info **orig
*** 1677,1683 ****
    int random_selector;
    struct lwp_info *event_lp;
  
!   /* Record the wait status for the origional LWP.  */
    (*orig_lp)->status = *status;
  
    /* Give preference to any LWP that is being single-stepped.  */
--- 1718,1724 ----
    int random_selector;
    struct lwp_info *event_lp;
  
!   /* Record the wait status for the original LWP.  */
    (*orig_lp)->status = *status;
  
    /* Give preference to any LWP that is being single-stepped.  */
*************** resumed_callback (struct lwp_info *lp, v
*** 1729,1734 ****
--- 1770,1799 ----
    return lp->resumed;
  }
  
+ /* Local mourn_inferior -- we need to override mourn_inferior
+    so that we can do something clever if one of several forks
+    has exited.  */
+ 
+ static void
+ child_mourn_inferior (void)
+ {
+   int status;
+ 
+   if (! FORKS_EXIST ())
+     {
+       /* Normal case, no other forks available.  */
+       super_mourn_inferior ();
+       return;
+     }
+   else
+     {
+       /* Multi-fork case.  The current inferior_ptid has exited, but
+ 	 there are other viable forks to debug.  Delete the exiting
+ 	 one and context-switch to the first available.  */
+       linux_fork_mourn_inferior ();
+     }
+ }
+ 
  /* We need to override child_wait to support attaching to cloned
     processes, since a normal wait (as done by the default version)
     ignores those processes.  */
*************** linux_target (void)
*** 3201,3206 ****
--- 3266,3274 ----
    super_xfer_partial = t->to_xfer_partial;
    t->to_xfer_partial = linux_xfer_partial;
  
+   super_mourn_inferior = t->to_mourn_inferior;
+   t->to_mourn_inferior = child_mourn_inferior;
+ 
    linux_ops = t;
    return t;
  }
*************** lin_thread_get_thread_signals (sigset_t 
*** 3312,3314 ****
--- 3380,3383 ----
    /* ... except during a sigsuspend.  */
    sigdelset (&suspend_mask, cancel);
  }
+ 
Index: config/alpha/alpha-linux.mh
===================================================================
RCS file: /cvs/src/src/gdb/config/alpha/alpha-linux.mh,v
retrieving revision 1.18
diff -p -r1.18 alpha-linux.mh
*** config/alpha/alpha-linux.mh	10 Sep 2005 18:11:07 -0000	1.18
--- config/alpha/alpha-linux.mh	23 Dec 2005 22:05:31 -0000
***************
*** 2,8 ****
  NAT_FILE= nm-linux.h
  NATDEPFILES= inf-ptrace.o corelow.o alpha-nat.o alpha-linux-nat.o \
  	fork-child.o proc-service.o linux-thread-db.o gcore.o \
! 	linux-nat.o
  
  # The dynamically loaded libthread_db needs access to symbols in the
  # gdb executable.
--- 2,8 ----
  NAT_FILE= nm-linux.h
  NATDEPFILES= inf-ptrace.o corelow.o alpha-nat.o alpha-linux-nat.o \
  	fork-child.o proc-service.o linux-thread-db.o gcore.o \
! 	linux-nat.o linux-fork.o
  
  # The dynamically loaded libthread_db needs access to symbols in the
  # gdb executable.
Index: config/arm/linux.mh
===================================================================
RCS file: /cvs/src/src/gdb/config/arm/linux.mh,v
retrieving revision 1.16
diff -p -r1.16 linux.mh
*** config/arm/linux.mh	10 Sep 2005 18:11:09 -0000	1.16
--- config/arm/linux.mh	23 Dec 2005 22:05:31 -0000
***************
*** 3,9 ****
  NAT_FILE= nm-linux.h
  NATDEPFILES= inf-ptrace.o fork-child.o corelow.o	\
  	core-regset.o arm-linux-nat.o gcore.o	\
! 	proc-service.o linux-thread-db.o linux-nat.o
  
  LOADLIBES= -ldl -rdynamic
  
--- 3,9 ----
  NAT_FILE= nm-linux.h
  NATDEPFILES= inf-ptrace.o fork-child.o corelow.o	\
  	core-regset.o arm-linux-nat.o gcore.o	\
! 	proc-service.o linux-thread-db.o linux-nat.o linux-fork.o
  
  LOADLIBES= -ldl -rdynamic
  
Index: config/i386/linux.mh
===================================================================
RCS file: /cvs/src/src/gdb/config/i386/linux.mh,v
retrieving revision 1.18
diff -p -r1.18 linux.mh
*** config/i386/linux.mh	10 Sep 2005 18:11:10 -0000	1.18
--- config/i386/linux.mh	23 Dec 2005 22:05:31 -0000
*************** NAT_FILE= nm-linux.h
*** 4,10 ****
  NATDEPFILES= inf-ptrace.o fork-child.o corelow.o \
  	core-aout.o i386-nat.o i386-linux-nat.o \
  	proc-service.o linux-thread-db.o gcore.o \
! 	linux-nat.o
  
  # The dynamically loaded libthread_db needs access to symbols in the
  # gdb executable.
--- 4,10 ----
  NATDEPFILES= inf-ptrace.o fork-child.o corelow.o \
  	core-aout.o i386-nat.o i386-linux-nat.o \
  	proc-service.o linux-thread-db.o gcore.o \
! 	linux-nat.o linux-fork.o
  
  # The dynamically loaded libthread_db needs access to symbols in the
  # gdb executable.
Index: config/i386/linux64.mh
===================================================================
RCS file: /cvs/src/src/gdb/config/i386/linux64.mh,v
retrieving revision 1.6
diff -p -r1.6 linux64.mh
*** config/i386/linux64.mh	10 Sep 2005 18:11:10 -0000	1.6
--- config/i386/linux64.mh	23 Dec 2005 22:05:31 -0000
***************
*** 1,7 ****
  # Host: GNU/Linux x86-64
  NATDEPFILES= inf-ptrace.o fork-child.o \
  	i386-nat.o amd64-nat.o amd64-linux-nat.o linux-nat.o \
! 	proc-service.o linux-thread-db.o gcore.o 
  NAT_FILE= nm-linux64.h
  
  # The dynamically loaded libthread_db needs access to symbols in the
--- 1,7 ----
  # Host: GNU/Linux x86-64
  NATDEPFILES= inf-ptrace.o fork-child.o \
  	i386-nat.o amd64-nat.o amd64-linux-nat.o linux-nat.o \
! 	proc-service.o linux-thread-db.o gcore.o  linux-fork.o
  NAT_FILE= nm-linux64.h
  
  # The dynamically loaded libthread_db needs access to symbols in the
Index: config/ia64/linux.mh
===================================================================
RCS file: /cvs/src/src/gdb/config/ia64/linux.mh,v
retrieving revision 1.19
diff -p -r1.19 linux.mh
*** config/ia64/linux.mh	10 Sep 2005 18:11:11 -0000	1.19
--- config/ia64/linux.mh	23 Dec 2005 22:05:31 -0000
***************
*** 3,8 ****
  NAT_FILE= nm-linux.h
  NATDEPFILES= inf-ptrace.o fork-child.o corelow.o gcore.o \
  	core-aout.o core-regset.o ia64-linux-nat.o \
! 	proc-service.o linux-thread-db.o linux-nat.o
  
  LOADLIBES = -ldl -rdynamic
--- 3,8 ----
  NAT_FILE= nm-linux.h
  NATDEPFILES= inf-ptrace.o fork-child.o corelow.o gcore.o \
  	core-aout.o core-regset.o ia64-linux-nat.o \
! 	proc-service.o linux-thread-db.o linux-nat.o linux-fork.o
  
  LOADLIBES = -ldl -rdynamic
Index: config/m32r/linux.mh
===================================================================
RCS file: /cvs/src/src/gdb/config/m32r/linux.mh,v
retrieving revision 1.3
diff -p -r1.3 linux.mh
*** config/m32r/linux.mh	10 Sep 2005 18:11:11 -0000	1.3
--- config/m32r/linux.mh	23 Dec 2005 22:05:31 -0000
***************
*** 3,8 ****
  NAT_FILE= nm-linux.h
  NATDEPFILES= inf-ptrace.o fork-child.o corelow.o	\
  	m32r-linux-nat.o gcore.o proc-service.o linux-thread-db.o	\
! 	linux-nat.o
  
  LOADLIBES= -ldl -rdynamic
--- 3,8 ----
  NAT_FILE= nm-linux.h
  NATDEPFILES= inf-ptrace.o fork-child.o corelow.o	\
  	m32r-linux-nat.o gcore.o proc-service.o linux-thread-db.o	\
! 	linux-nat.o linux-fork.o
  
  LOADLIBES= -ldl -rdynamic
Index: config/m68k/linux.mh
===================================================================
RCS file: /cvs/src/src/gdb/config/m68k/linux.mh,v
retrieving revision 1.17
diff -p -r1.17 linux.mh
*** config/m68k/linux.mh	10 Sep 2005 18:11:12 -0000	1.17
--- config/m68k/linux.mh	23 Dec 2005 22:05:31 -0000
***************
*** 3,9 ****
  NAT_FILE= nm-linux.h
  NATDEPFILES= inf-ptrace.o fork-child.o \
  	corelow.o core-aout.o m68klinux-nat.o gcore.o \
! 	proc-service.o linux-thread-db.o linux-nat.o
  
  # The dynamically loaded libthread_db needs access to symbols in the
  # gdb executable.
--- 3,9 ----
  NAT_FILE= nm-linux.h
  NATDEPFILES= inf-ptrace.o fork-child.o \
  	corelow.o core-aout.o m68klinux-nat.o gcore.o \
! 	proc-service.o linux-thread-db.o linux-nat.o linux-fork.o
  
  # The dynamically loaded libthread_db needs access to symbols in the
  # gdb executable.
Index: config/mips/linux.mh
===================================================================
RCS file: /cvs/src/src/gdb/config/mips/linux.mh,v
retrieving revision 1.10
diff -p -r1.10 linux.mh
*** config/mips/linux.mh	10 Sep 2005 18:11:12 -0000	1.10
--- config/mips/linux.mh	23 Dec 2005 22:05:31 -0000
***************
*** 2,7 ****
  NAT_FILE= nm-linux.h
  NATDEPFILES= inf-ptrace.o fork-child.o mips-linux-nat.o \
  	linux-thread-db.o proc-service.o gcore.o \
! 	linux-nat.o
  
  LOADLIBES = -ldl -rdynamic
--- 2,7 ----
  NAT_FILE= nm-linux.h
  NATDEPFILES= inf-ptrace.o fork-child.o mips-linux-nat.o \
  	linux-thread-db.o proc-service.o gcore.o \
! 	linux-nat.o linux-fork.o
  
  LOADLIBES = -ldl -rdynamic
Index: config/pa/linux.mh
===================================================================
RCS file: /cvs/src/src/gdb/config/pa/linux.mh,v
retrieving revision 1.6
diff -p -r1.6 linux.mh
*** config/pa/linux.mh	10 Sep 2005 18:11:12 -0000	1.6
--- config/pa/linux.mh	23 Dec 2005 22:05:31 -0000
*************** XDEPFILES=
*** 3,8 ****
  NAT_FILE= nm-linux.h
  NATDEPFILES= inf-ptrace.o fork-child.o corelow.o gcore.o \
  	core-regset.o hppa-linux-nat.o \
! 	proc-service.o linux-thread-db.o linux-nat.o
  
  LOADLIBES = -ldl -rdynamic
--- 3,8 ----
  NAT_FILE= nm-linux.h
  NATDEPFILES= inf-ptrace.o fork-child.o corelow.o gcore.o \
  	core-regset.o hppa-linux-nat.o \
! 	proc-service.o linux-thread-db.o linux-nat.o linux-fork.o
  
  LOADLIBES = -ldl -rdynamic
Index: config/powerpc/linux.mh
===================================================================
RCS file: /cvs/src/src/gdb/config/powerpc/linux.mh,v
retrieving revision 1.19
diff -p -r1.19 linux.mh
*** config/powerpc/linux.mh	10 Sep 2005 18:11:13 -0000	1.19
--- config/powerpc/linux.mh	23 Dec 2005 22:05:31 -0000
*************** XM_CLIBS=
*** 5,10 ****
  NAT_FILE= nm-linux.h
  NATDEPFILES= inf-ptrace.o fork-child.o \
  	ppc-linux-nat.o proc-service.o linux-thread-db.o \
! 	gcore.o linux-nat.o
  
  LOADLIBES = -ldl -rdynamic
--- 5,10 ----
  NAT_FILE= nm-linux.h
  NATDEPFILES= inf-ptrace.o fork-child.o \
  	ppc-linux-nat.o proc-service.o linux-thread-db.o \
! 	gcore.o linux-nat.o linux-fork.o
  
  LOADLIBES = -ldl -rdynamic
Index: config/powerpc/ppc64-linux.mh
===================================================================
RCS file: /cvs/src/src/gdb/config/powerpc/ppc64-linux.mh,v
retrieving revision 1.8
diff -p -r1.8 ppc64-linux.mh
*** config/powerpc/ppc64-linux.mh	10 Sep 2005 18:11:13 -0000	1.8
--- config/powerpc/ppc64-linux.mh	23 Dec 2005 22:05:31 -0000
*************** XM_CLIBS=
*** 5,11 ****
  NAT_FILE= nm-ppc64-linux.h
  NATDEPFILES= inf-ptrace.o fork-child.o \
  	ppc-linux-nat.o proc-service.o linux-thread-db.o \
! 	gcore.o linux-nat.o
  
  # The PowerPC has severe limitations on TOC size, and uses them even
  # for non-PIC code.  GDB overflows those tables when compiling with
--- 5,11 ----
  NAT_FILE= nm-ppc64-linux.h
  NATDEPFILES= inf-ptrace.o fork-child.o \
  	ppc-linux-nat.o proc-service.o linux-thread-db.o \
! 	gcore.o linux-nat.o linux-fork.o
  
  # The PowerPC has severe limitations on TOC size, and uses them even
  # for non-PIC code.  GDB overflows those tables when compiling with
Index: config/sparc/linux.mh
===================================================================
RCS file: /cvs/src/src/gdb/config/sparc/linux.mh,v
retrieving revision 1.16
diff -p -r1.16 linux.mh
*** config/sparc/linux.mh	10 Sep 2005 18:11:13 -0000	1.16
--- config/sparc/linux.mh	23 Dec 2005 22:05:31 -0000
*************** NAT_FILE= nm-linux.h
*** 3,9 ****
  NATDEPFILES= sparc-nat.o sparc-sol2-nat.o sparc-linux-nat.o \
  	corelow.o core-regset.o fork-child.o inf-ptrace.o \
  	proc-service.o linux-thread-db.o \
! 	gcore.o linux-nat.o
  
  # The dynamically loaded libthread_db needs access to symbols in the
  # gdb executable.
--- 3,9 ----
  NATDEPFILES= sparc-nat.o sparc-sol2-nat.o sparc-linux-nat.o \
  	corelow.o core-regset.o fork-child.o inf-ptrace.o \
  	proc-service.o linux-thread-db.o \
! 	gcore.o linux-nat.o linux-fork.o
  
  # The dynamically loaded libthread_db needs access to symbols in the
  # gdb executable.
Index: config/sparc/linux64.mh
===================================================================
RCS file: /cvs/src/src/gdb/config/sparc/linux64.mh,v
retrieving revision 1.7
diff -p -r1.7 linux64.mh
*** config/sparc/linux64.mh	10 Sep 2005 18:11:14 -0000	1.7
--- config/sparc/linux64.mh	23 Dec 2005 22:05:31 -0000
*************** NATDEPFILES= sparc-nat.o sparc64-nat.o s
*** 4,10 ****
  	corelow.o core-regset.o \
  	fork-child.o inf-ptrace.o \
  	proc-service.o linux-thread-db.o \
! 	gcore.o linux-nat.o
  
  # The dynamically loaded libthread_db needs access to symbols in the
  # gdb executable.
--- 4,10 ----
  	corelow.o core-regset.o \
  	fork-child.o inf-ptrace.o \
  	proc-service.o linux-thread-db.o \
! 	gcore.o linux-nat.o linux-fork.o
  
  # The dynamically loaded libthread_db needs access to symbols in the
  # gdb executable.
Index: doc/gdb.texinfo
===================================================================
RCS file: /cvs/src/src/gdb/doc/gdb.texinfo,v
retrieving revision 1.300
diff -p -r1.300 gdb.texinfo
*** doc/gdb.texinfo	23 Dec 2005 19:26:16 -0000	1.300
--- doc/gdb.texinfo	23 Dec 2005 22:05:36 -0000
*************** kill a child process.
*** 1740,1745 ****
--- 1740,1746 ----
  
  * Threads::                     Debugging programs with multiple threads
  * Processes::                   Debugging programs with multiple processes
+ * Checkpoint/Restart::          Setting a @emph{bookmark} to return to later
  @end menu
  
  @node Compilation
*************** unimpeded.
*** 2507,2512 ****
--- 2508,2583 ----
  Display the current debugger response to a @code{fork} or @code{vfork} call.
  @end table
  
+ @cindex debugging multiple processes
+ On Linux, if you want to debug both the parent and child processes, use the
+ command @w{@code{set detach-on-fork}}.
+ 
+ @table @code
+ @kindex set detach-on-fork
+ @item set detach-on-fork @var{mode}
+ Tells gdb whether to detach one of the processes after a fork, or
+ retain debugger control over them both.
+ 
+ @table @code
+ @item on
+ The child process (or parent process, depending on the value of
+ @code{follow-fork-mode}) will be detached and allowed to run 
+ independently.  This is the default.
+ 
+ @item off
+ Both processes will be held under the control of @value{GDBN}.
+ One process (child or parent, depending on the value of 
+ @code{follow-fork-mode}) is debugged as usual, while the other
+ is held suspended.  
+ 
+ @end table
+ 
+ @kindex show detach-on-follow
+ @item show detach-on-follow
+ Show whether detach-on-follow mode is on/off.
+ @end table
+ 
+ If you choose to set @var{detach-on-follow} mode off, then
+ @value{GDBN} will retain control of all forked processes (including
+ nested forks).  You can list the forked processes under the control of
+ @value{GDBN} by using the @w{@code{info forks}} command, and switch
+ from one fork to another by using the @w{@code{fork}} command.
+ 
+ @table @code
+ @kindex info forks
+ @item info forks
+ Print a list of all forked processes under the control of @value{GDBN}.
+ The listing will include a fork id, a process id, and the current 
+ position (program counter) of the process.
+ 
+ 
+ @kindex fork @var{fork-id}
+ @item fork @var{fork-id}
+ Make fork number @var{fork-id} the current process.  The argument
+ @var{fork-id} is the internal fork number assigned by @value{GDBN},
+ as shown in the first field of the @samp{info forks} display.
+ 
+ @end table
+ 
+ To quit debugging one of the forked processes, you can either detach
+ from it by using the @w{@code{detach-fork}} command (allowing it to
+ run independently), or delete (and kill) it using the
+ @w{@code{delete-fork}} command.
+ 
+ @table @code
+ @kindex detach-fork @var{fork-id}
+ @item detach-fork @var{fork-id}
+ Detach from the process identified by @value{GDBN} fork number
+ @var{fork-id}, and remove it from the fork list.  The process will be
+ allowed to run independently.
+ 
+ @kindex delete-fork @var{fork-id}
+ @item delete-fork @var{fork-id}
+ Kill the process identified by @value{GDBN} fork number @var{fork-id},
+ and remove it from the fork list.
+ 
+ @end table
+ 
  If you ask to debug a child process and a @code{vfork} is followed by an
  @code{exec}, @value{GDBN} executes the new target up to the first
  breakpoint in the new target.  If you have a breakpoint set on
*************** You can use the @code{catch} command to 
*** 2525,2530 ****
--- 2596,2715 ----
  a @code{fork}, @code{vfork}, or @code{exec} call is made.  @xref{Set
  Catchpoints, ,Setting catchpoints}.
  
+ @node Checkpoint/Restart
+ @section Setting a @emph{bookmark} to return to later
+ 
+ @cindex checkpoint
+ @cindex restart
+ @cindex bookmark
+ @cindex snapshot of a process
+ @cindex rewind program state
+ 
+ On certain operating systems@footnote{Currently, only
+ @sc{gnu}/Linux.}, @value{GDBN} is able to save a @dfn{snapshot} of a
+ program's state, called a @dfn{checkpoint}, and come back to it
+ later.
+ 
+ Returning to a checkpoint effectively undoes everything that has
+ happened in the program since the @code{checkpoint} was saved.  This
+ includes changes in memory, registers, and even (within some limits)
+ system state.  Effectively, it is like going back in time to the
+ moment when the checkpoint was saved.
+ 
+ Thus, if you're stepping thru a program and you think you're 
+ getting close to the point where things go wrong, you can save
+ a checkpoint.  Then, if you accidentally go too far and miss
+ the critical statement, instead of having to restart your program
+ from the beginning, you can just go back to the checkpoint and
+ start again from there.
+ 
+ This can be especially useful if it takes a lot of time or 
+ steps to reach the point where you think the bug occurs.  
+ 
+ To use the @code{checkpoint}/@code{restart} method of debugging:
+ 
+ @table @code
+ @kindex checkpoint
+ @item checkpoint
+ Save a snapshot of the debugged program's current execution state.
+ The @code{checkpoint} command takes no arguments, but each checkpoint
+ is assigned a small integer id, similar to a breakpoint id.
+ 
+ @kindex info checkpoints
+ @item info checkpoints
+ List the checkpoints that have been saved in the current debugging
+ session.  For each checkpoint, the following information will be
+ listed:
+ 
+ @table @code
+ @item Checkpoint ID
+ @item Process ID
+ @item Code Address
+ @item Source line, or label
+ @end table
+ 
+ @kindex restart @var{checkpoint-id}
+ @item restart @var{checkpoint-id}
+ Restore the program state that was saved as checkpoint number
+ @var{checkpoint-id}.  All program variables, registers, stack frames
+ etc.@:  will be returned to the values that they had when the checkpoint
+ was saved.  In essence, gdb will ``wind back the clock'' to the point
+ in time when the checkpoint was saved.
+ 
+ Note that breakpoints, @value{GDBN} variables, command history etc.
+ are not affected by restoring a checkpoint.  In general, a checkpoint
+ only restores things that reside in the program being debugged, not in
+ the debugger.
+ 
+ @kindex delete-checkpoint @var{checkpoint-id}
+ @item delete-checkpoint @var{checkpoint-id}
+ Delete the previously-saved checkpoint identified by @var{checkpoint-id}.
+ 
+ @end table
+ 
+ Returning to a previously saved checkpoint will restore the user state
+ of the program being debugged, plus a significant subset of the system
+ (OS) state, including file pointers.  It won't ``un-write'' data from
+ a file, but it will rewind the file pointer to the previous location,
+ so that the previously written data can be overwritten.  For files
+ opened in read mode, the pointer will also be restored so that the
+ previously read data can be read again.
+ 
+ Of course, characters that have been sent to a printer (or other
+ external device) cannot be ``snatched back'', and characters received
+ from eg.@: a serial device can be removed from internal program buffers,
+ but they cannot be ``pushed back'' into the serial pipeline, ready to
+ be received again.  Similarly, the actual contents of files that have
+ been changed cannot be restored (at this time).
+ 
+ However, within those constraints, you actually can ``rewind'' your
+ program to a previously saved point in time, and begin debugging it
+ again --- and you can change the course of events so as to debug a
+ different execution path this time.
+ 
+ @cindex checkpoints and process id
+ Finally, there is one bit of internal program state that will be
+ different when you return to a checkpoint --- the program's process
+ id.  Each checkpoint will have a unique process id (or @var{pid}), 
+ and each will be different from the program's original @var{pid}.
+ If your program has saved a local copy of its process id, this could
+ potentially pose a problem.
+ 
+ @subsection A non-obvious benefit of using checkpoints
+ 
+ On some systems such as @sc{gnu}/Linux, address space randomization
+ is performed on new processes for security reasons.  This makes it 
+ difficult or impossible to set a breakpoint, or watchpoint, on an
+ absolute address if you have to restart the program, since the 
+ absolute location of a symbol will change from one execution to the
+ next.
+ 
+ A checkpoint, however, is an @emph{identical} copy of a process. 
+ Therefore if you create a checkpoint at (eg.@:) the start of main, 
+ and simply return to that checkpoint instead of restarting the 
+ process, you can avoid the effects of address randomization and
+ your symbols will all stay in the same place.
+ 
  @node Stopping
  @chapter Stopping and Continuing
  
Index: doc/gdbint.texinfo
===================================================================
RCS file: /cvs/src/src/gdb/doc/gdbint.texinfo,v
retrieving revision 1.232
diff -p -r1.232 gdbint.texinfo
*** doc/gdbint.texinfo	23 Dec 2005 19:26:16 -0000	1.232
--- doc/gdbint.texinfo	23 Dec 2005 22:05:37 -0000
*************** watchpoints might interfere with the und
*** 712,717 ****
--- 712,749 ----
  unavailable in many platforms.
  @end enumerate
  
+ @section Checkpoints
+ @cindex checkpoints
+ @cindex restart
+ In the abstract, a checkpoint is a point in the execution history of
+ the program, which the user may wish to return to at some later time.
+ 
+ Internally, a checkpoint is a saved copy of the program state, including
+ whatever information is required in order to restore the program to that
+ state at a later time.  This can be expected to include the state of 
+ registers and memory, and may include external state such as the state
+ of open files and devices.
+ 
+ There are a number of ways in which checkpoints may be implemented
+ in gdb, eg. as corefiles, as forked processes, and as some opaque
+ method implemented on the target side.
+ 
+ A corefile can be used to save an image of target memory and register
+ state, which can in principle be restored later --- but corefiles do
+ not typically include information about external entities such as 
+ open files.  Currently this method is not implemented in gdb.
+ 
+ A forked process can save the state of user memory and registers, 
+ as well as some subset of external (kernel) state.  This method 
+ is used to implement checkpoints on Linux, and in principle might
+ be used on other systems.
+ 
+ Some targets, eg.@: simulators, might have their own built-in 
+ method for saving checkpoints, and gdb might be able to take
+ advantage of that capability without necessarily knowing any
+ details of how it is done.
+ 
+ 
  @section Observing changes in @value{GDBN} internals
  @cindex observer pattern interface
  @cindex notifications about changes in internals
Index: testsuite/gdb.base/checkpoint.c
===================================================================
RCS file: testsuite/gdb.base/checkpoint.c
diff -N testsuite/gdb.base/checkpoint.c
*** /dev/null	1 Jan 1970 00:00:00 -0000
--- testsuite/gdb.base/checkpoint.c	23 Dec 2005 22:05:38 -0000
***************
*** 0 ****
--- 1,62 ----
+ /* This testcase is part of GDB, the GNU debugger.
+ 
+    Copyright 2005 Free Software Foundation, Inc.
+ 
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+ 
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+  
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ 
+    Please email any bugs, comments, and/or additions to this file to:
+    bug-gdb@prep.ai.mit.edu  */
+ 
+ #include <stdio.h>
+ 
+ long lines = 0;
+ 
+ main()
+ {
+   char linebuf[128];
+   FILE *in, *out;
+   char *tmp = &linebuf[0];
+   long i;
+   int c = 0;
+ 
+   in  = fopen ("pi.txt", "r");
+   out = fopen ("copy1.txt", "w");
+ 
+   if (!in || !out)
+     {
+       fprintf (stderr, "File open failed\n");
+       exit (1);
+     }
+ 
+   for (i = 0; ; i++)
+     {
+       if (ftell (in) != i)
+ 	fprintf (stderr, "Input error at %d\n", i);
+       if (ftell (out) != i)
+ 	fprintf (stderr, "Output error at %d\n", i);
+       c = fgetc (in);
+       if (c == '\n')
+ 	lines++;	/* breakpoint 1 */
+       if (c == EOF)
+ 	break;
+       fputc (c, out);
+     }
+   printf ("Copy complete.\n");	/* breakpoint 2 */
+   fclose (in);
+   fclose (out);
+   printf ("Deleting copy.\n");	/* breakpoint 3 */
+   unlink ("copy1.txt");
+   exit (0);			/* breakpoint 4 */
+ }
Index: testsuite/gdb.base/checkpoint.exp
===================================================================
RCS file: testsuite/gdb.base/checkpoint.exp
diff -N testsuite/gdb.base/checkpoint.exp
*** /dev/null	1 Jan 1970 00:00:00 -0000
--- testsuite/gdb.base/checkpoint.exp	23 Dec 2005 22:05:38 -0000
***************
*** 0 ****
--- 1,375 ----
+ #   Copyright 2005 Free Software Foundation, Inc.
+ 
+ # This program is free software; you can redistribute it and/or modify
+ # it under the terms of the GNU General Public License as published by
+ # the Free Software Foundation; either version 2 of the License, or
+ # (at your option) any later version.
+ # 
+ # This program is distributed in the hope that it will be useful,
+ # but WITHOUT ANY WARRANTY; without even the implied warranty of
+ # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ # GNU General Public License for more details.
+ # 
+ # You should have received a copy of the GNU General Public License
+ # along with this program; if not, write to the Free Software
+ # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+ 
+ # Please email any bugs, comments, and/or additions to this file to:
+ # bug-gdb@prep.ai.mit.edu
+ 
+ if $tracelevel then {
+ 	strace $tracelevel
+ 	}
+ 
+ if { ![isnative] } then {
+     continue
+ }
+ 
+ # Until "set follow-fork-mode" and "catch fork" are implemented on
+ # other targets...
+ #
+ if {![istarget "*-*-linux*"]} then {
+     continue
+ }
+ 
+ set prms_id 0
+ set bug_id 0
+ 
+ set testfile "checkpoint"
+ set srcfile ${testfile}.c
+ set binfile ${objdir}/${subdir}/${testfile}
+ 
+ if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
+      gdb_suppress_entire_file "Testcase compile failed, so all tests in this file will automatically fail."
+ }
+ 
+ # Start with a fresh gdb
+ 
+ gdb_exit
+ gdb_start
+ gdb_reinitialize_dir $srcdir/$subdir
+ gdb_load ${binfile}
+ 
+ global gdb_prompt
+ 
+ #
+ # This tests gdb checkpoint and restart.
+ #
+ 
+ remote_download host ${srcdir}/${subdir}/pi.txt pi.txt
+ 
+ runto_main
+ set break1_loc [gdb_get_line_number "breakpoint 1"]
+ set break2_loc [gdb_get_line_number "breakpoint 2"]
+ set break3_loc [gdb_get_line_number "breakpoint 3"]
+ set break4_loc [gdb_get_line_number "breakpoint 4"]
+ 
+ gdb_breakpoint $break1_loc
+ gdb_test "continue" "breakpoint 1.*" "break1 start"
+ 
+ gdb_test "checkpoint" "" ""
+ gdb_test "continue 10" "breakpoint 1.*" "break1 two"
+ 
+ gdb_test "checkpoint" "" ""
+ gdb_test "continue 10" "breakpoint 1.*" "break1 three"
+ 
+ gdb_test "checkpoint" "" ""
+ gdb_test "continue 10" "breakpoint 1.*" "break1 four" 
+ 
+ gdb_test "checkpoint" "" ""
+ gdb_test "continue 10" "breakpoint 1.*" "break1 five"
+ 
+ gdb_test "checkpoint" "" ""
+ gdb_test "continue 10" "breakpoint 1.*" "break1 six"
+ 
+ gdb_test "checkpoint" "" ""
+ gdb_test "continue 10" "breakpoint 1.*" "break1 seven"
+ 
+ gdb_test "checkpoint" "" ""
+ gdb_test "continue 10" "breakpoint 1.*" "break1 eight"
+ 
+ gdb_test "checkpoint" "" ""
+ gdb_test "continue 10" "breakpoint 1.*" "break1 nine"
+ 
+ gdb_test "checkpoint" "" ""
+ gdb_test "continue 10" "breakpoint 1.*" "break1 ten"
+ 
+ gdb_test "checkpoint" "" ""
+ 
+ gdb_test "info checkpoints" \
+     " 10 .* 9 .* 8 .* 7 .* 6 .* 5 .* 4 .* 3 .* 2 .* 1 .*" \
+     "info checkpoints one"
+ 
+ delete_breakpoints
+ gdb_breakpoint $break2_loc
+ gdb_test "continue" "breakpoint 2.*" "break2 one"
+ 
+ gdb_test "restart 1" "Switching to .*breakpoint 1.*" "restart 1 one"
+ gdb_test "print i" " = 78" "verify i 1 one"
+ gdb_test "step" "if .c == EOF.*" "step in 1 one"
+ gdb_test "print lines" " = 1.*" "verify lines 1 one"
+ 
+ gdb_test "restart 2" "Switching to .*breakpoint 1.*" "restart 2 one"
+ gdb_test "step" "if .c == EOF.*" "step in 2 one"
+ gdb_test "print i + 1 == lines * 79" " = 1" "verify i 2 one"
+ gdb_test "print lines" " = 11.*" "verify lines 2 one"
+ 
+ gdb_test "restart 3" "Switching to .*breakpoint 1.*" "restart 3 one"
+ gdb_test "step" "if .c == EOF.*" "step in 3 one"
+ gdb_test "print i + 1 == lines * 79" " = 1" "verify i 3 one"
+ gdb_test "print lines" " = 21.*" "verify lines 3 one"
+ 
+ gdb_test "restart 4" "Switching to .*breakpoint 1.*" "restart 4 one"
+ gdb_test "step" "if .c == EOF.*" "step in 4 one"
+ gdb_test "print i + 1 == lines * 79" " = 1" "verify i 4 one"
+ gdb_test "print lines" " = 31.*" "verify lines 4 one"
+ 
+ gdb_test "restart 5" "Switching to .*breakpoint 1.*" "restart 5 one"
+ gdb_test "step" "if .c == EOF.*" "step in 5 one"
+ gdb_test "print i + 1 == lines * 79" " = 1" "verify i 5 one"
+ gdb_test "print lines" " = 41.*" "verify lines 5 one"
+ 
+ gdb_test "restart 6" "Switching to .*breakpoint 1.*" "restart 6 one"
+ gdb_test "step" "if .c == EOF.*" "step in 6 one"
+ gdb_test "print i + 1 == lines * 79" " = 1" "verify i 6 one"
+ gdb_test "print lines" " = 51.*" "verify lines 6 one"
+ 
+ gdb_test "restart 7" "Switching to .*breakpoint 1.*" "restart 7 one"
+ gdb_test "step" "if .c == EOF.*" "step in 7 one"
+ gdb_test "print i + 1 == lines * 79" " = 1" "verify i 7 one"
+ gdb_test "print lines" " = 61.*" "verify lines 7 one"
+ 
+ gdb_test "restart 8" "Switching to .*breakpoint 1.*" "restart 8 one"
+ gdb_test "step" "if .c == EOF.*" "step in 8 one"
+ gdb_test "print i + 1 == lines * 79" " = 1" "verify i 8 one"
+ gdb_test "print lines" " = 71.*" "verify lines 8 one"
+ 
+ gdb_test "restart 9" "Switching to .*breakpoint 1.*" "restart 9 one"
+ gdb_test "step" "if .c == EOF.*" "step in 9 one"
+ gdb_test "print i + 1 == lines * 79" " = 1" "verify i 9 one"
+ gdb_test "print lines" " = 81.*" "verify lines 9 one"
+ 
+ gdb_test "restart 10" "Switching to .*breakpoint 1.*" "restart 10 one"
+ gdb_test "step" "if .c == EOF.*" "step in 10 one"
+ gdb_test "print i + 1 == lines * 79" " = 1" "verify i 10 one"
+ gdb_test "print lines" " = 91.*" "verify lines 10 one"
+ 
+ #
+ # Now let the files be closed by the original process, 
+ # and diff them.
+ 
+ gdb_test "restart 0" "Switching to .*breakpoint 2.*" "restart 0 one"
+ gdb_breakpoint $break3_loc
+ gdb_test "continue" "breakpoint 3.*" "break3 one"
+ 
+ gdb_test "shell diff -s pi.txt copy1.txt" \
+     "Files pi.txt and copy1.txt are identical.*" \
+     "Diff input and output one"
+ 
+ #
+ # And now run from various checkpoints, allowing 
+ # various amounts of input and output.
+ #
+ 
+ gdb_breakpoint $break1_loc
+ 
+ gdb_test "restart 1" "Switching to .*c == EOF.*" "restart 1 two"
+ gdb_test "continue" "" ""
+ gdb_test "continue 100" "breakpoint 1.*" "breakpoint 1 1 one"
+ gdb_test "step" "if .c == EOF.*" "step in 1 two"
+ gdb_test "print lines" " = 102.*" "verify lines 1 two"
+ 
+ gdb_test "restart 2" "Switching to .*c == EOF.*" "restart 2 two"
+ gdb_test "continue" "" ""
+ gdb_test "continue 100" "breakpoint 1.*" "breakpoint 1 2 one"
+ gdb_test "step" "if .c == EOF.*" "step in 2 two"
+ gdb_test "print lines" " = 112.*" "verify lines 2 two"
+ 
+ gdb_test "restart 3" "Switching to .*c == EOF.*" "restart 3 two"
+ gdb_test "continue" "" ""
+ gdb_test "continue 500" "breakpoint 1.*" "breakpoint 1 3 one"
+ gdb_test "step" "if .c == EOF.*" "step in 3 two"
+ gdb_test "print lines" " = 522.*" "verify lines 3 two"
+ 
+ gdb_test "restart 4" "Switching to .*c == EOF.*" "restart 4 two"
+ gdb_test "continue" "" ""
+ gdb_test "continue 500" "breakpoint 1.*" "breakpoint 1 4 one"
+ gdb_test "step" "if .c == EOF.*" "step in 4 two"
+ gdb_test "print lines" " = 532.*" "verify lines 4 two"
+ 
+ gdb_test "restart 5" "Switching to .*c == EOF.*" "restart 5 two"
+ gdb_test "continue" "" ""
+ gdb_test "continue 1000" "breakpoint 1.*" "breakpoint 1 5 one"
+ gdb_test "step" "if .c == EOF.*" "step in 5 two"
+ gdb_test "print lines" " = 1042.*" "verify lines 5 two"
+ 
+ gdb_test "restart 6" "Switching to .*c == EOF.*" "restart 6 two"
+ gdb_test "continue" "" ""
+ gdb_test "continue 1000" "breakpoint 1.*" "breakpoint 1 6 one"
+ gdb_test "step" "if .c == EOF.*" "step in 6 two"
+ gdb_test "print lines" " = 1052.*" "verify lines 5 two"
+ 
+ gdb_test "restart 7" "Switching to .*c == EOF.*" "restart 7 two"
+ gdb_test "continue" "" ""
+ gdb_test "continue 1100" "breakpoint 1.*" "breakpoint 1 7 one"
+ gdb_test "step" "if .c == EOF.*" "step in 7 two"
+ gdb_test "print lines" " = 1162.*" "verify lines 7 two"
+ 
+ gdb_test "shell diff -s pi.txt copy1.txt" \
+     "Files pi.txt and copy1.txt are identical.*" \
+     "Diff input and output two"
+ 
+ # 
+ # OK, now allow the original program to delete the output file, 
+ # and verify that the checkpoints can still write to it.
+ # 
+ 
+ gdb_test "restart 0" "Switching to .*breakpoint 3.*" "restart 0 one"
+ gdb_breakpoint $break4_loc
+ gdb_test "continue" "breakpoint 4.*" "break4 one"
+ 
+ gdb_test "shell diff pi.txt copy1.txt" \
+     "diff: copy1.txt: No such file or directory" \
+     "delete copy1"
+ 
+ delete_breakpoints
+ gdb_breakpoint $break2_loc
+ 
+ gdb_test "restart 1" "if .c == EOF.*" "restart 1 three"
+ gdb_test "continue" "breakpoint 2.*" "break2 1 one"
+ gdb_test "print ftell (out) > 100000" " = 1.*" "outfile still open 1"
+ 
+ gdb_test "restart 2" "if .c == EOF.*" "restart 1 three"
+ gdb_test "continue" "breakpoint 2.*" "break2 2 one"
+ gdb_test "print ftell (out) > 100000" " = 1.*" "outfile still open 2"
+ 
+ gdb_test "restart 3" "if .c == EOF.*" "restart 1 three"
+ gdb_test "continue" "breakpoint 2.*" "break2 3 one"
+ gdb_test "print ftell (out) > 100000" " = 1.*" "outfile still open 3"
+ 
+ gdb_test "restart 4" "if .c == EOF.*" "restart 1 three"
+ gdb_test "continue" "breakpoint 2.*" "break2 4 one"
+ gdb_test "print ftell (out) > 100000" " = 1.*" "outfile still open 4"
+ 
+ gdb_test "restart 5" "if .c == EOF.*" "restart 1 three"
+ gdb_test "continue" "breakpoint 2.*" "break2 5 one"
+ gdb_test "print ftell (out) > 100000" " = 1.*" "outfile still open 5"
+ 
+ gdb_test "restart 6" "if .c == EOF.*" "restart 1 three"
+ gdb_test "continue" "breakpoint 2.*" "break2 6 one"
+ gdb_test "print ftell (out) > 100000" " = 1.*" "outfile still open 6"
+ 
+ gdb_test "restart 7" "if .c == EOF.*" "restart 1 three"
+ gdb_test "continue" "breakpoint 2.*" "break2 7 one"
+ gdb_test "print ftell (out) > 100000" " = 1.*" "outfile still open 7"
+ 
+ gdb_test "restart 8" "if .c == EOF.*" "restart 1 three"
+ gdb_test "continue" "breakpoint 2.*" "break2 8 one"
+ gdb_test "print ftell (out) > 100000" " = 1.*" "outfile still open 8"
+ 
+ gdb_test "restart 9" "if .c == EOF.*" "restart 1 three"
+ gdb_test "continue" "breakpoint 2.*" "break2 9 one"
+ gdb_test "print ftell (out) > 100000" " = 1.*" "outfile still open 9"
+ 
+ gdb_test "restart 10" "if .c == EOF.*" "restart 1 three"
+ gdb_test "continue" "breakpoint 2.*" "break2 10 one"
+ gdb_test "print ftell (out) > 100000" " = 1.*" "outfile still open 10"
+ 
+ #
+ # Now confirm that if one fork exits, we automatically switch to another one.
+ #
+ 
+ delete_breakpoints
+ gdb_test "continue" \
+     "Deleting copy.*Program exited normally.*Switching to.*" \
+     "Exit, dropped into next fork one"
+ 
+ gdb_test "continue" \
+     "Deleting copy.*Program exited normally.*Switching to.*" \
+     "Exit, dropped into next fork two"
+ 
+ gdb_test "continue" \
+     "Deleting copy.*Program exited normally.*Switching to.*" \
+     "Exit, dropped into next fork three"
+ 
+ gdb_test "continue" \
+     "Deleting copy.*Program exited normally.*Switching to.*" \
+     "Exit, dropped into next fork four"
+ 
+ gdb_test "continue" \
+     "Deleting copy.*Program exited normally.*Switching to.*" \
+     "Exit, dropped into next fork five"
+ 
+ #
+ # There should be still at least five forks left
+ # 
+ 
+ gdb_test "info checkpoints" " 5 .* 4 .* 3 .* 2 .* 1 .*" \
+     "info checkpoints two"
+ 
+ #
+ # Kill should now terminate all of them.
+ #
+ 
+ gdb_test "kill" "" "kill all one" \
+     "Kill the program being debugged.*y or n. $" "y"
+ 
+ # 
+ # and confirm that all are gone
+ #
+ 
+ gdb_test "restart 0" "Not found.*" "no more checkpoint 0"
+ gdb_test "restart 1" "Not found.*" "no more checkpoint 1"
+ gdb_test "restart 2" "Not found.*" "no more checkpoint 2"
+ gdb_test "restart 3" "Not found.*" "no more checkpoint 3"
+ gdb_test "restart 4" "Not found.*" "no more checkpoint 4"
+ gdb_test "restart 5" "Not found.*" "no more checkpoint 5"
+ gdb_test "restart 6" "Not found.*" "no more checkpoint 6"
+ gdb_test "restart 7" "Not found.*" "no more checkpoint 7"
+ gdb_test "restart 8" "Not found.*" "no more checkpoint 8"
+ gdb_test "restart 9" "Not found.*" "no more checkpoint 9"
+ gdb_test "restart 10" "Not found.*" "no more checkpoint 10"
+ 
+ #
+ # Now let's try setting a large number of checkpoints (>1000)
+ #
+ 
+ gdb_exit
+ gdb_start
+ gdb_reinitialize_dir $srcdir/$subdir
+ gdb_load ${binfile}
+ 
+ runto_main
+ gdb_breakpoint $break1_loc
+ 
+ send_gdb "commands\n"
+ send_gdb "  silent\n"
+ send_gdb "  if (lines % 2)\n"
+ send_gdb "    checkpoint\n"
+ send_gdb "  end\n"
+ send_gdb "  continue\n"
+ send_gdb "end\n"
+ 
+ gdb_expect {
+     -re ".*$gdb_prompt $" { pass "set checkpoint breakpoint" }
+     timeout { fail "(timeout) set checkpoint breakpoint" }
+ }
+ 
+ gdb_breakpoint $break2_loc
+ gdb_test "continue" "breakpoint 2.*" "break2 with many checkpoints"
+ 
+ gdb_test "info checkpoints" " 600 .* 0 .*" \
+     "info checkpoints with at least 600 checkpoints"
+ 
+ #
+ # OK, kill 'em all...
+ #
+ 
+ gdb_test "kill" "" "kill all one" \
+     "Kill the program being debugged.*y or n. $" "y"
+ 
+ #
+ # Finished: cleanup
+ #
+ 
+ remote_exec build "rm -f pi.txt"
Index: testsuite/gdb.base/multi-forks.c
===================================================================
RCS file: testsuite/gdb.base/multi-forks.c
diff -N testsuite/gdb.base/multi-forks.c
*** /dev/null	1 Jan 1970 00:00:00 -0000
--- testsuite/gdb.base/multi-forks.c	23 Dec 2005 22:05:38 -0000
***************
*** 0 ****
--- 1,18 ----
+ #include <stdio.h>
+ #include <sys/types.h>
+ #include <unistd.h>
+ 
+ pid_t pids[4];
+ 
+ main()
+ {
+   int i;
+ 
+   for (i = 0; i < 4; i++)
+     pids [i] = fork ();
+ 
+   printf ("%d ready\n", getpid ());
+   sleep (2);
+   printf ("%d done\n", getpid ());
+   exit (0);	/* Set exit breakpoint here.  */
+ }
Index: testsuite/gdb.base/multi-forks.exp
===================================================================
RCS file: testsuite/gdb.base/multi-forks.exp
diff -N testsuite/gdb.base/multi-forks.exp
*** /dev/null	1 Jan 1970 00:00:00 -0000
--- testsuite/gdb.base/multi-forks.exp	23 Dec 2005 22:13:25 -0000
***************
*** 0 ****
--- 1,214 ----
+ #   Copyright 2005 Free Software Foundation, Inc.
+ 
+ # This program is free software; you can redistribute it and/or modify
+ # it under the terms of the GNU General Public License as published by
+ # the Free Software Foundation; either version 2 of the License, or
+ # (at your option) any later version.
+ # 
+ # This program is distributed in the hope that it will be useful,
+ # but WITHOUT ANY WARRANTY; without even the implied warranty of
+ # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ # GNU General Public License for more details.
+ # 
+ # You should have received a copy of the GNU General Public License
+ # along with this program; if not, write to the Free Software
+ # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+ 
+ # Please email any bugs, comments, and/or additions to this file to:
+ # bug-gdb@prep.ai.mit.edu
+ 
+ if $tracelevel then {
+ 	strace $tracelevel
+ 	}
+ 
+ if { ![isnative] } then {
+     continue
+ }
+ 
+ # Until "set follow-fork-mode" and "catch fork" are implemented on
+ # other targets...
+ #
+ if {![istarget "hppa*-hp-hpux*"] && ![istarget "*-*-linux*"]} then {
+     continue
+ }
+ 
+ set prms_id 0
+ set bug_id 0
+ 
+ set testfile "multi-forks"
+ set srcfile ${testfile}.c
+ set binfile ${objdir}/${subdir}/${testfile}
+ 
+ if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
+      gdb_suppress_entire_file "Testcase compile failed, so all tests in this file will automatically fail."
+ }
+ 
+ # Start with a fresh gdb
+ 
+ gdb_exit
+ gdb_start
+ gdb_reinitialize_dir $srcdir/$subdir
+ gdb_load ${binfile}
+ 
+ global gdb_prompt
+ 
+ # This is a test of gdb's ability to follow the parent, child or both
+ # parent and child of multiple Unix fork() system calls.
+ #
+ 
+ # Inferior program calls fork 4 times.  Since each fork
+ # calls fork 4 times, there will be 16 forks.  Each fork
+ # saves the return values of its own 4 fork calls.
+ 
+ # First set gdb to follow the child.
+ # The result should be that each of the 4 forks returns zero.
+ 
+ runto_main
+ set exit_bp_loc [gdb_get_line_number "Set exit breakpoint here."]
+ gdb_test "break $exit_bp_loc" "Breakpoint.* at .*" "Break at exit"
+ gdb_test "set follow child" "" ""
+ 
+ send_gdb "continue\n"
+ gdb_expect {
+     -re ".*Break.* main .*$gdb_prompt $" {}
+     -re ".*$gdb_prompt $" {fail "run to exit 1"}
+     default {fail "run to exit 1 (timeout)"}
+ }
+ 
+ gdb_test "print pids" "\\$.* = \\{0, 0, 0, 0\\}.*" "follow child, print pids"
+ 
+ # Now set gdb to follow the parent.
+ # Result should be that none of the 4 forks returns zero.
+ 
+ delete_breakpoints
+ runto_main
+ gdb_test "break $exit_bp_loc" "Breakpoint.* at .*" "Break at exit"
+ gdb_test "set follow parent" "" ""
+ 
+ send_gdb "continue\n"
+ gdb_expect {
+     -re ".*Break.* main .*$gdb_prompt $" {}
+     -re ".*$gdb_prompt $" {fail "run to exit 2"}
+     default {fail "run to exit 2 (timeout)"}
+ }
+ 
+ gdb_test "print pids\[0\]==0 || pids\[1\]==0 || pids\[2\]==0 || pids\[3\]==0" \
+     " = 0" "follow parent, print pids"
+ 
+ #
+ # Now test with detach-on-fork off.
+ #
+ 
+ runto_main
+ gdb_test "break $exit_bp_loc" "Breakpoint.* at .*" ""
+ 
+ gdb_test "help set detach-on-fork" "whether gdb will detach the child.*" \
+     "help set detach"
+ 
+ gdb_test "show detach-on-fork" "on." "show detach default on"
+ 
+ gdb_test "set detach off" "" "set detach off"
+ 
+ #
+ # We will now run every fork up to the exit bp, 
+ # eventually winding up with 16 forks.
+ #
+ 
+ gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 1"
+ gdb_test "info fork" " 4 .* 3 .* 2 .* 1 .*" "info fork 1"
+ gdb_test "restart 1" "_dl_sysinfo_int80.*" "restart 1"
+ 
+ gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 2"
+ gdb_test "info fork" " 4 .* 3 .* 2 .* 1 .*" "info fork 2"
+ gdb_test "restart 2" "_dl_sysinfo_int80.*" "restart 2"
+ 
+ gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 3"
+ gdb_test "info fork" " 4 .* 3 .* 2 .* 1 .*" "info fork 3"
+ gdb_test "restart 3" "_dl_sysinfo_int80.*" "restart 3"
+ 
+ gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 4"
+ gdb_test "info fork" " 4 .* 3 .* 2 .* 1 .*" "info fork 4"
+ gdb_test "restart 4" "_dl_sysinfo_int80.*" "restart 4"
+ 
+ gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 5"
+ gdb_test "info fork" " 4 .* 3 .* 2 .* 1 .*" "info fork 5"
+ gdb_test "restart 5" "_dl_sysinfo_int80.*" "restart 5"
+ 
+ gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 6"
+ gdb_test "info fork" " 4 .* 3 .* 2 .* 1 .*" "info fork 6"
+ gdb_test "restart 6" "_dl_sysinfo_int80.*" "restart 6"
+ 
+ gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 7"
+ gdb_test "info fork" " 4 .* 3 .* 2 .* 1 .*" "info fork 7"
+ gdb_test "restart 7" "_dl_sysinfo_int80.*" "restart 7"
+ 
+ gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 8"
+ gdb_test "info fork" " 4 .* 3 .* 2 .* 1 .*" "info fork 8"
+ gdb_test "restart 8" "_dl_sysinfo_int80.*" "restart 8"
+ 
+ gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 9"
+ gdb_test "info fork" " 4 .* 3 .* 2 .* 1 .*" "info fork 9"
+ gdb_test "restart 9" "_dl_sysinfo_int80.*" "restart 9"
+ 
+ gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 10"
+ gdb_test "info fork" " 4 .* 3 .* 2 .* 1 .*" "info fork 10"
+ gdb_test "restart 10" "_dl_sysinfo_int80.*" "restart 10"
+ 
+ gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 11"
+ gdb_test "info fork" " 4 .* 3 .* 2 .* 1 .*" "info fork 11"
+ gdb_test "restart 11" "_dl_sysinfo_int80.*" "restart 11"
+ 
+ gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 12"
+ gdb_test "info fork" " 4 .* 3 .* 2 .* 1 .*" "info fork 12"
+ gdb_test "restart 12" "_dl_sysinfo_int80.*" "restart 12"
+ 
+ gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 13"
+ gdb_test "info fork" " 4 .* 3 .* 2 .* 1 .*" "info fork 13"
+ gdb_test "restart 13" "_dl_sysinfo_int80.*" "restart 13"
+ 
+ gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 14"
+ gdb_test "info fork" " 4 .* 3 .* 2 .* 1 .*" "info fork 14"
+ gdb_test "restart 14" "_dl_sysinfo_int80.*" "restart 14"
+ 
+ gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 15"
+ gdb_test "info fork" " 4 .* 3 .* 2 .* 1 .*" "info fork 15"
+ gdb_test "restart 15" "_dl_sysinfo_int80.*" "restart 15"
+ 
+ gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 16"
+ gdb_test "info fork" " 4 .* 3 .* 2 .* 1 .*" "info fork 16"
+ gdb_test "restart 0" " main .*" "restart final"
+ 
+ #
+ # Now we should examine all the pids.
+ #
+ 
+ # 
+ # Test detach-fork
+ # 
+ 
+ # [assumes we're at #0]
+ gdb_test "detach-fork 1" "Detached .*" "Detach 1"
+ gdb_test "detach-fork 2" "Detached .*" "Detach 2"
+ gdb_test "detach-fork 3" "Detached .*" "Detach 3"
+ gdb_test "detach-fork 4" "Detached .*" "Detach 4"
+ 
+ # 
+ # Test delete-fork
+ # 
+ 
+ gdb_test "delete-fork 5" "" "Delete 5"
+ gdb_test "delete-fork 6" "" "Delete 6"
+ gdb_test "delete-fork 7" "" "Delete 7"
+ gdb_test "delete-fork 8" "" "Delete 8"
+ gdb_test "delete-fork 9" "" "Delete 9"
+ gdb_test "delete-fork 10" "" "Delete 10"
+ gdb_test "delete-fork 11" "" "Delete 11"
+ gdb_test "delete-fork 12" "" "Delete 12"
+ gdb_test "delete-fork 13" "" "Delete 13"
+ gdb_test "delete-fork 14" "" "Delete 14"
+ gdb_test "delete-fork 15" "" "Delete 15"
+ 
+ 
+ 
+ return 0
+ 
Index: testsuite/gdb.base/pi.txt
===================================================================
RCS file: testsuite/gdb.base/pi.txt
diff -N testsuite/gdb.base/pi.txt
*** /dev/null	1 Jan 1970 00:00:00 -0000
--- testsuite/gdb.base/pi.txt	23 Dec 2005 22:05:38 -0000
***************
*** 0 ****
--- 1,1283 ----
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