2011-10-11 Pedro Alves <pedro@codesourcery.com>

	gdb/
	* linux-nat.c (linux_lwp_is_zombie): Return early if the LWP is
	not zombie instead of reading the whole file.

2 files changed, 13 insertions, 4 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index fc4e9dd..3aedc62 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2011-10-11  Pedro Alves  <pedro@codesourcery.com>
+
+	* linux-nat.c (linux_lwp_is_zombie): Return early if the LWP is
+	not zombie instead of reading the whole file.
+
 2011-10-11  Jan Kratochvil  <jan.kratochvil@redhat.com>
 
 	Fix separate debuginfo warning with "remote:" access.
diff --git a/gdb/linux-nat.c b/gdb/linux-nat.c
index 411afdc..5c80114 100644
--- a/gdb/linux-nat.c
+++ b/gdb/linux-nat.c
@@ -2382,7 +2382,8 @@ linux_lwp_is_zombie (long lwp)
 {
   char buffer[MAXPATHLEN];
   FILE *procfile;
-  int retval = 0;
+  int retval;
+  int have_state;
 
   xsnprintf (buffer, sizeof (buffer), "/proc/%ld/status", lwp);
   procfile = fopen (buffer, "r");
@@ -2391,14 +2392,17 @@ linux_lwp_is_zombie (long lwp)
       warning (_("unable to open /proc file '%s'"), buffer);
       return 0;
     }
+
+  have_state = 0;
   while (fgets (buffer, sizeof (buffer), procfile) != NULL)
-    if (strcmp (buffer, "State:\tZ (zombie)\n") == 0)
+    if (strncmp (buffer, "State:", 6) == 0)
       {
-	retval = 1;
+	have_state = 1;
 	break;
       }
+  retval = (have_state
+	    && strcmp (buffer, "State:\tZ (zombie)\n") == 0);
   fclose (procfile);
-
   return retval;
 }