exec.c

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2
   3 /** \file exec.c Helper functions for spawning new processes. */
   4
   5 #include <string.h>
   6 #include <unistd.h>
   7 #include <assert.h>
   8 #include <stdlib.h>
   9 #include <signal.h>
  10 #include <errno.h>
  11
  12 #include "gcc-compat.h"
  13 #include "log.h"
  14 #include "err.h"
  15 #include "str.h"
  16 #include "exec.h"
  17
  18 /**
  19  * Spawn a new process using execvp().
  20  *
  21  * \param pid Will hold the pid of the created process upon return.
  22  * \param file Path of the executable to execute.
  23  * \param args The argument array for the command.
  24  *
  25  * \return Standard.
  26  *
  27  * \sa fork(2), exec(3).
  28  */
  29 void dss_exec(pid_t *pid, const char *file, char *const *const args)
  30 {
  31         if ((*pid = fork()) < 0) {
  32                 DSS_EMERG_LOG(("fork error: %s\n", strerror(errno)));
  33                 exit(EXIT_FAILURE);
  34         }
  35         if (*pid) /* parent */
  36                 return;
  37         signal(SIGINT, SIG_DFL);
  38         signal(SIGTERM, SIG_DFL);
  39         signal(SIGCHLD, SIG_DFL);
  40         execvp(file, args);
  41         DSS_EMERG_LOG(("execvp error: %s\n", strerror(errno)));
  42         _exit(EXIT_FAILURE);
  43 }
  44
  45 /**
  46  * Exec the command given as a command line.
  47  *
  48  * \param pid Will hold the pid of the created process upon return.
  49  * \param cmdline Holds the command and its arguments, separated by spaces.
  50  *
  51  * This function uses fork/exec to create a new process.
  52  *
  53  * \return Standard.
  54  */
  55 void dss_exec_cmdline_pid(pid_t *pid, const char *cmdline)
  56 {
  57         char **argv, *tmp = dss_strdup(cmdline);
  58
  59         split_args(tmp, &argv);
  60         dss_exec(pid, argv[0], argv);
  61         free(argv);
  62         free(tmp);
  63 }