Merge GDB 7.5.1

gdb/testsuite/gdb.base/attach-twice.c

 /* This testcase is part of GDB, the GNU debugger.
 
    Copyright 2011-2012 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 3 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, see <http://www.gnu.org/licenses/>.  */
 
-#include <signal.h>
-#include <assert.h>
+#include <stdlib.h>
 #include <unistd.h>
-#include <stdio.h>
-
-void
-handler (int signo)
-{
-  sleep (600);
-  assert (0);
-}
+#include <sys/ptrace.h>
+#include <errno.h>
 
 int
 main (void)
 {
-  signal (SIGUSR1, handler);
-  raise (SIGUSR1);
-  assert (0);
+  long l;
+
+  switch (fork ())
+  {
+    case -1:
+      perror ("fork");
+      exit (1);
+    case 0:
+      errno = 0;
+      ptrace (PTRACE_ATTACH, getppid (), NULL, NULL);
+      if (errno != 0)
+        perror ("PTRACE_ATTACH");
+      break;
+  }
+  sleep (600);
   return 0;
 }