[patch] Fix gdbserver handling of "detach" packet.

[dje at google dot com (Doug Evans)]

Hi.

ref: http://sourceware.org/ml/gdb/2011-04/msg00147.html

I will check this in in a few days if there are no objections.
I verified cvs head gdbserver exits leaving the inferior running
without this patch and waits for the inferior with it (amd64-linux).

2011-04-26  Doug Evans  <dje@google.com>

	* linux-low.c (linux_join): Skip process lookup.
	* server.c (join_inferiors_callback): Delete.
	(process_serial_event): For 'D' packet (detach) call join_inferior
	directly.

Index: linux-low.c
===================================================================
RCS file: /cvs/src/src/gdb/gdbserver/linux-low.c,v
retrieving revision 1.170
diff -u -p -r1.170 linux-low.c
--- linux-low.c	27 Feb 2011 21:41:26 -0000	1.170
+++ linux-low.c	26 Apr 2011 17:24:36 -0000
@@ -915,11 +915,6 @@ static void
 linux_join (int pid)
 {
   int status, ret;
-  struct process_info *process;
-
-  process = find_process_pid (pid);
-  if (process == NULL)
-    return;
 
   do {
     ret = my_waitpid (pid, &status, 0);
Index: server.c
===================================================================
RCS file: /cvs/src/src/gdb/gdbserver/server.c,v
retrieving revision 1.143
diff -u -p -r1.143 server.c
--- server.c	24 Apr 2011 08:02:20 -0000	1.143
+++ server.c	26 Apr 2011 17:24:36 -0000
@@ -2442,17 +2442,6 @@ detach_or_kill_for_exit (void)
   for_each_inferior (&all_processes, detach_or_kill_inferior_callback);
 }
 
-static void
-join_inferiors_callback (struct inferior_list_entry *entry)
-{
-  struct process_info *process = (struct process_info *) entry;
-
-  /* If we are attached, then we can exit.  Otherwise, we need to hang
-     around doing nothing, until the child is gone.  */
-  if (!process->attached)
-    join_inferior (ptid_get_pid (process->head.id));
-}
-
 int
 main (int argc, char *argv[])
 {
@@ -2851,8 +2840,7 @@ process_serial_event (void)
 	      /* If we are attached, then we can exit.  Otherwise, we
 		 need to hang around doing nothing, until the child is
 		 gone.  */
-	      for_each_inferior (&all_processes,
-				 join_inferiors_callback);
+	      join_inferior (pid);
 	      exit (0);
 	    }
 	}