gdb/testsuite/gdb.threads/step-over-exec.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2020-2021 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include <unistd.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <pthread.h>
  23
  24 #include "../lib/my-syscalls.h"
  25
  26 #if (!defined(LEADER_DOES_EXEC) && !defined(OTHER_DOES_EXEC) \
  27      || defined(LEADER_DOES_EXEC) && defined(OTHER_DOES_EXEC))
  28 # error "Exactly one of LEADER_DOES_EXEC and OTHER_DOES_EXEC must be defined."
  29 #endif
  30
  31
  32 static char *argv0;
  33 static pthread_barrier_t barrier;
  34
  35 static void
  36 do_the_exec (void)
  37 {
  38   char *execd_path = (char *) malloc (strlen (argv0) + sizeof ("-execd"));
  39   sprintf (execd_path, "%s-execd", argv0);
  40   char *argv[] = { execd_path, NULL };
  41
  42   printf ("Exec-ing %s\n", execd_path);
  43
  44   extern char **environ;
  45   my_execve (execd_path, argv, environ);
  46
  47   printf ("Exec failed :(\n");
  48   abort ();
  49 }
  50
  51 static void *
  52 thread_func (void *arg)
  53 {
  54   pthread_barrier_wait (&barrier);
  55 #ifdef OTHER_DOES_EXEC
  56   printf ("Other going in exec.\n");
  57   do_the_exec ();
  58 #endif
  59
  60   /* Just make sure the thread does not exit when the leader does the exec.  */
  61   pthread_barrier_wait (&barrier);
  62
  63   return NULL;
  64 }
  65
  66 int
  67 main (int argc, char *argv[])
  68 {
  69   argv0 = argv[0];
  70
  71   int ret = pthread_barrier_init (&barrier, NULL, 2);
  72   if (ret != 0)
  73     abort ();
  74
  75   pthread_t thread;
  76   ret = pthread_create (&thread, NULL, thread_func, argv[0]);
  77   if (ret != 0)
  78     abort ();
  79
  80   pthread_barrier_wait (&barrier);
  81
  82 #ifdef LEADER_DOES_EXEC
  83   printf ("Leader going in exec.\n");
  84   do_the_exec ();
  85 #endif
  86
  87   pthread_join (thread, NULL);
  88
  89   return 0;
  90 }