[RFA] linux-nat.c minor cleanup

[dje at google dot com (Doug Evans)]

Hi.

linux-nat.c:linux_nat_info_proc_cmd uses a long long to record a pid.
There's not much point in that, so this patch changes it to a long.
[either that or it shouldn't use strtoul to parse it :-)]

The handling of info proc cmd,cwd,exe is odd too.
They're always printed and yet argument parsing looks for them anyway,
and ignores invalid commands instead of flagging an error.
This patch adds a blurb about printing cmd,cwd,exe in the help text.
The manual already touches on this, though it doesn't precisely
say that cmd,cwd,exe are always printed.
I wouldn't mind also submitting a patch to flag unknown commands
as errors, but I'm not sure what's intended as far as the parsing
of cmd,cwd,exe.

Ok to check in?

2008-12-18  Doug Evans  <dje@google.com>

	* linux-nat.c (linux_nat_info_proc_cmd): Store pid in long instead
	of long long.
	(_initialize_linux_nat): For info proc command, document that it
	always prints the command line, cwd, and exe path name.

Index: linux-nat.c
===================================================================
RCS file: /cvs/src/src/gdb/linux-nat.c,v
retrieving revision 1.113
diff -u -p -r1.113 linux-nat.c
--- linux-nat.c	18 Dec 2008 21:35:22 -0000	1.113
+++ linux-nat.c	19 Dec 2008 05:16:19 -0000
@@ -3597,7 +3597,7 @@ linux_nat_make_corefile_notes (bfd *obfd
 static void
 linux_nat_info_proc_cmd (char *args, int from_tty)
 {
-  long long pid = PIDGET (inferior_ptid);
+  long pid = PIDGET (inferior_ptid);
   FILE *procfile;
   char **argv = NULL;
   char buffer[MAXPATHLEN];
@@ -3661,14 +3661,14 @@ linux_nat_info_proc_cmd (char *args, int
   if (pid == 0)
     error (_("No current process: you must name one."));
 
-  sprintf (fname1, "/proc/%lld", pid);
+  sprintf (fname1, "/proc/%ld", pid);
   if (stat (fname1, &dummy) != 0)
     error (_("No /proc directory: '%s'"), fname1);
 
-  printf_filtered (_("process %lld\n"), pid);
+  printf_filtered (_("process %ld\n"), pid);
   if (cmdline_f || all)
     {
-      sprintf (fname1, "/proc/%lld/cmdline", pid);
+      sprintf (fname1, "/proc/%ld/cmdline", pid);
       if ((procfile = fopen (fname1, "r")) != NULL)
 	{
 	  struct cleanup *cleanup = make_cleanup_fclose (procfile);
@@ -3681,7 +3681,7 @@ linux_nat_info_proc_cmd (char *args, int
     }
   if (cwd_f || all)
     {
-      sprintf (fname1, "/proc/%lld/cwd", pid);
+      sprintf (fname1, "/proc/%ld/cwd", pid);
       memset (fname2, 0, sizeof (fname2));
       if (readlink (fname1, fname2, sizeof (fname2)) > 0)
 	printf_filtered ("cwd = '%s'\n", fname2);
@@ -3690,7 +3690,7 @@ linux_nat_info_proc_cmd (char *args, int
     }
   if (exe_f || all)
     {
-      sprintf (fname1, "/proc/%lld/exe", pid);
+      sprintf (fname1, "/proc/%ld/exe", pid);
       memset (fname2, 0, sizeof (fname2));
       if (readlink (fname1, fname2, sizeof (fname2)) > 0)
 	printf_filtered ("exe = '%s'\n", fname2);
@@ -3699,7 +3699,7 @@ linux_nat_info_proc_cmd (char *args, int
     }
   if (mappings_f || all)
     {
-      sprintf (fname1, "/proc/%lld/maps", pid);
+      sprintf (fname1, "/proc/%ld/maps", pid);
       if ((procfile = fopen (fname1, "r")) != NULL)
 	{
 	  long long addr, endaddr, size, offset, inode;
@@ -3761,7 +3761,7 @@ linux_nat_info_proc_cmd (char *args, int
     }
   if (status_f || all)
     {
-      sprintf (fname1, "/proc/%lld/status", pid);
+      sprintf (fname1, "/proc/%ld/status", pid);
       if ((procfile = fopen (fname1, "r")) != NULL)
 	{
 	  struct cleanup *cleanup = make_cleanup_fclose (procfile);
@@ -3774,7 +3774,7 @@ linux_nat_info_proc_cmd (char *args, int
     }
   if (stat_f || all)
     {
-      sprintf (fname1, "/proc/%lld/stat", pid);
+      sprintf (fname1, "/proc/%ld/stat", pid);
       if ((procfile = fopen (fname1, "r")) != NULL)
 	{
 	  int itmp;
@@ -4684,7 +4684,9 @@ _initialize_linux_nat (void)
   add_info ("proc", linux_nat_info_proc_cmd, _("\
 Show /proc process information about any running process.\n\
 Specify any process id, or use the program being debugged by default.\n\
-Specify any of the following keywords for detailed info:\n\
+The command line, current working directory, and full path name of the\n\
+executable are printed.\n\
+Specify any of the following keywords for additional detailed info:\n\
   mappings -- list of mapped memory regions.\n\
   stat     -- list a bunch of random process info.\n\
   status   -- list a different bunch of random process info.\n\