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[dss.git] / 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, " \t");
60 dss_exec(pid, argv[0], argv);
61 free(argv);
62 free(tmp);
63 }