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vfork-follow-parent.c revision 1.1.1.2 
      1 /* This testcase is part of GDB, the GNU debugger.
      2 
      3    Copyright 2021-2024 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 
     20 #include <string.h>
     21 #include <limits.h>
     22 #include <stdio.h>
     23 
     24 static volatile int unblock_parent = 0;
     25 
     26 static void
     27 break_parent (void)
     28 {
     29 }
     30 
     31 int
     32 main (int argc, char **argv)
     33 {
     34   alarm (30);
     35 
     36   if (vfork () != 0)
     37     {
     38       /* We want to guarantee that GDB processes the child exit event before
     39 	 the parent's breakpoint hit event.  Make the parent wait on this
     40 	 variable that is eventually set by the test.  */
     41       while (!unblock_parent)
     42 	usleep (1000);
     43 
     44       break_parent ();
     45     }
     46   else
     47     {
     48 #if defined TEST_EXEC
     49       char prog[PATH_MAX];
     50       int len;
     51 
     52       strcpy (prog, argv[0]);
     53       len = strlen (prog);
     54       for (; len > 0; --len)
     55 	{
     56 	  if (prog[len - 1] == '/')
     57 	    break;
     58 	}
     59       strcpy (&prog[len], "vforked-prog");
     60       execlp (prog, prog, (char *) 0);
     61       perror ("exec failed");
     62       _exit (1);
     63 #elif defined TEST_EXIT
     64       _exit (0);
     65 #else
     66 #error Define TEST_EXEC or TEST_EXIT
     67 #endif
     68     }
     69 
     70   return 0;
     71 }
     72