LXR iproute2/lib/exec.c

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#include <sys/wait.h>
   3#include <stdio.h>
   4#include <errno.h>
   5#include <unistd.h>
   6
   7#include "utils.h"
   8#include "namespace.h"
   9
  10int cmd_exec(const char *cmd, char **argv, bool do_fork,
  11             int (*setup)(void *), void *arg)
  12{
  13        fflush(stdout);
  14        if (do_fork) {
  15                int status;
  16                pid_t pid;
  17
  18                pid = fork();
  19                if (pid < 0) {
  20                        perror("fork");
  21                        exit(1);
  22                }
  23
  24                if (pid != 0) {
  25                        /* Parent  */
  26                        if (waitpid(pid, &status, 0) < 0) {
  27                                perror("waitpid");
  28                                exit(1);
  29                        }
  30
  31                        if (WIFEXITED(status)) {
  32                                return WEXITSTATUS(status);
  33                        }
  34
  35                        exit(1);
  36                }
  37        }
  38
  39        if (setup && setup(arg))
  40                return -1;
  41
  42        if (execvp(cmd, argv)  < 0)
  43                fprintf(stderr, "exec of \"%s\" failed: %s\n",
  44                                cmd, strerror(errno));
  45        _exit(1);
  46}
  47