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      1 /* This testcase is part of GDB, the GNU debugger.
      2 
      3    Copyright 2020-2024 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 "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 }
     91