From: uweigand <uweigand>
Date: Tue, 5 Aug 2008 22:13:23 +0000 (+0000)
Subject: 	* linux-low.c (linux_resume_one_process): Ignore ESRCH.
X-Git-Tag: cgen-snapshot-20091101~5899
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=f5ed5d358353521f9b7536932df2a3f8d436083f;p=pf3gnuchains%2Fpf3gnuchains4x.git

	* linux-low.c (linux_resume_one_process): Ignore ESRCH.
	(usr_store_inferior_registers): Likewise.
	(regsets_store_inferior_registers): Likewise.
---

diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index df515934f4..715cc9f069 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,3 +1,10 @@
+2008-08-05  Ulrich Weigand  <uweigand@de.ibm.com>
+	    Daniel Jacobowitz  <dan@codesourcery.com>
+
+	* linux-low.c (linux_resume_one_process): Ignore ESRCH.
+	(usr_store_inferior_registers): Likewise.
+	(regsets_store_inferior_registers): Likewise.
+
 2008-07-31  Rolf Jansen  <rj@surtec.com>
 	    Pedro Alves  <pedro@codesourcery.com>
 
diff --git a/gdb/gdbserver/linux-low.c b/gdb/gdbserver/linux-low.c
index fe4cd97cc8..722953e152 100644
--- a/gdb/gdbserver/linux-low.c
+++ b/gdb/gdbserver/linux-low.c
@@ -1193,7 +1193,19 @@ linux_resume_one_process (struct inferior_list_entry *entry,
 
   current_inferior = saved_inferior;
   if (errno)
-    perror_with_name ("ptrace");
+    {
+      /* ESRCH from ptrace either means that the thread was already
+	 running (an error) or that it is gone (a race condition).  If
+	 it's gone, we will get a notification the next time we wait,
+	 so we can ignore the error.  We could differentiate these
+	 two, but it's tricky without waiting; the thread still exists
+	 as a zombie, so sending it signal 0 would succeed.  So just
+	 ignore ESRCH.  */
+      if (errno == ESRCH)
+	return;
+
+      perror_with_name ("ptrace");
+    }
 }
 
 static struct thread_resume *resume_ptr;
@@ -1462,6 +1474,12 @@ usr_store_inferior_registers (int regno)
 		  *(PTRACE_XFER_TYPE *) (buf + i));
 	  if (errno != 0)
 	    {
+	      /* At this point, ESRCH should mean the process is already gone, 
+		 in which case we simply ignore attempts to change its registers.
+		 See also the related comment in linux_resume_one_process.  */
+	      if (errno == ESRCH)
+		return;
+
 	      if ((*the_low_target.cannot_store_register) (regno) == 0)
 		{
 		  char *err = strerror (errno);
@@ -1578,6 +1596,13 @@ regsets_store_inferior_registers ()
 	      disabled_regsets[regset - target_regsets] = 1;
 	      continue;
 	    }
+	  else if (errno == ESRCH)
+	    {
+	      /* At this point, ESRCH should mean the process is already gone, 
+		 in which case we simply ignore attempts to change its registers.
+		 See also the related comment in linux_resume_one_process.  */
+	      return 0;
+	    }
 	  else
 	    {
 	      perror ("Warning: ptrace(regsets_store_inferior_registers)");