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 <sys/wait.h>
  24 #include <stdlib.h>
  25
  26 #define TRACEPOINT_DEFINE
  27 #define TRACEPOINT_CREATE_PROBES
  28 #include "ust_tests_fork.h"
  29
  30 int main(int argc, char **argv, char *env[])
  31 {
  32         int result;
  33
  34         if (argc < 2) {
  35                 fprintf(stderr, "usage: fork PROG_TO_EXEC\n");
  36                 exit(1);
  37         }
  38
  39         printf("parent_pid %d\n", getpid());
  40         tracepoint(ust_tests_fork, before_fork, getpid());
  41
  42         result = fork();
  43         if (result == -1) {
  44                 perror("fork");
  45                 return 1;
  46         }
  47         if (result == 0) {
  48                 char *args[] = { "fork2", NULL };
  49
  50                 tracepoint(ust_tests_fork, after_fork_child, getpid());
  51
  52                 result = execve(argv[1], args, env);
  53                 if (result == -1) {
  54                         perror("execve");
  55                         result = 1;
  56                         goto end;
  57                 }
  58         } else {
  59                 printf("child_pid %d\n", result);
  60                 tracepoint(ust_tests_fork, after_fork_parent, getpid());
  61                 if (waitpid(result, NULL, 0) < 0) {
  62                         perror("waitpid");
  63                         result = 1;
  64                         goto end;
  65                 }
  66         }
  67         result = 0;
  68 end:
  69         return result;
  70 }