tests/regression/ust/fork/fork.c

   1 /*
   2  * Copyright (C) 2009  Pierre-Marc Fournier
   3  * Copyright (C) 2011  Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; version 2.1 of
   8  * the License.
   9  *
  10  * This library 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 GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  18  */
  19
  20 #include <stdio.h>
  21 #include <unistd.h>
  22 #include <sys/types.h>
  23 #include <stdlib.h>
  24
  25 #define TRACEPOINT_DEFINE
  26 #define TRACEPOINT_CREATE_PROBES
  27 #include "ust_tests_fork.h"
  28
  29 int main(int argc, char **argv, char *env[])
  30 {
  31         int result;
  32
  33         if (argc < 2) {
  34                 fprintf(stderr, "usage: fork PROG_TO_EXEC\n");
  35                 exit(1);
  36         }
  37
  38         printf("parent_pid %d\n", getpid());
  39         tracepoint(ust_tests_fork, before_fork, getpid());
  40
  41         result = fork();
  42         if (result == -1) {
  43                 perror("fork");
  44                 return 1;
  45         }
  46         if (result == 0) {
  47                 char *args[] = { "fork2", NULL };
  48
  49                 tracepoint(ust_tests_fork, after_fork_child, getpid());
  50
  51                 result = execve(argv[1], args, env);
  52                 if (result == -1) {
  53                         perror("execve");
  54                         return 1;
  55                 }
  56         } else {
  57                 printf("child_pid %d\n", result);
  58                 tracepoint(ust_tests_fork, after_fork_parent, getpid());
  59         }
  60
  61         return 0;
  62 }