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  * SPDX-License-Identifier: LGPL-2.1-only
   6  *
   7  */
   8
   9 #include <stdio.h>
  10 #include <unistd.h>
  11 #include <sys/types.h>
  12 #include <sys/wait.h>
  13 #include <stdlib.h>
  14
  15 #define TRACEPOINT_DEFINE
  16 #define TRACEPOINT_CREATE_PROBES
  17 #include "ust_tests_fork.h"
  18
  19 int main(int argc, char **argv, char *env[])
  20 {
  21         int result;
  22
  23         if (argc < 2) {
  24                 fprintf(stderr, "usage: fork PROG_TO_EXEC\n");
  25                 exit(1);
  26         }
  27
  28         printf("parent_pid %d\n", getpid());
  29         tracepoint(ust_tests_fork, before_fork, getpid());
  30
  31         result = fork();
  32         if (result == -1) {
  33                 perror("fork");
  34                 return 1;
  35         }
  36         if (result == 0) {
  37                 char *args[] = { "fork2", NULL };
  38
  39                 tracepoint(ust_tests_fork, after_fork_child, getpid());
  40
  41                 result = execve(argv[1], args, env);
  42                 if (result == -1) {
  43                         perror("execve");
  44                         result = 1;
  45                         goto end;
  46                 }
  47         } else {
  48                 printf("child_pid %d\n", result);
  49                 tracepoint(ust_tests_fork, after_fork_parent, getpid());
  50                 if (waitpid(result, NULL, 0) < 0) {
  51                         perror("waitpid");
  52                         result = 1;
  53                         goto end;
  54                 }
  55         }
  56         result = 0;
  57 end:
  58         return result;
  59 }