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[dss.git] / exec.c
1 /*
2 * Copyright (C) 2003-2011 Andre Noll <maan@tuebingen.mpg.de>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file exec.c Helper functions for spawning new processes. */
8
9 #include <string.h>
10 #include <unistd.h>
11 #include <assert.h>
12 #include <stdlib.h>
13 #include <signal.h>
14 #include <errno.h>
15
16 #include "gcc-compat.h"
17 #include "log.h"
18 #include "err.h"
19 #include "str.h"
20 #include "exec.h"
21
22 /**
23 * Spawn a new process using execvp().
24 *
25 * \param pid Will hold the pid of the created process upon return.
26 * \param file Path of the executable to execute.
27 * \param args The argument array for the command.
28 *
29 * \return Standard.
30 *
31 * \sa fork(2), exec(3).
32 */
33 void dss_exec(pid_t *pid, const char *file, char *const *const args)
34 {
35 if ((*pid = fork()) < 0) {
36 DSS_EMERG_LOG(("fork error: %s\n", strerror(errno)));
37 exit(EXIT_FAILURE);
38 }
39 if (*pid) /* parent */
40 return;
41 signal(SIGINT, SIG_DFL);
42 signal(SIGTERM, SIG_DFL);
43 signal(SIGCHLD, SIG_DFL);
44 execvp(file, args);
45 DSS_EMERG_LOG(("execvp error: %s\n", strerror(errno)));
46 _exit(EXIT_FAILURE);
47 }
48
49 /**
50 * Exec the command given as a command line.
51 *
52 * \param pid Will hold the pid of the created process upon return.
53 * \param cmdline Holds the command and its arguments, seperated by spaces.
54 *
55 * This function uses fork/exec to create a new process.
56 *
57 * \return Standard.
58 */
59 void dss_exec_cmdline_pid(pid_t *pid, const char *cmdline)
60 {
61 char **argv, *tmp = dss_strdup(cmdline);
62
63 split_args(tmp, &argv, " \t");
64 dss_exec(pid, argv[0], argv);
65 free(argv);
66 free(tmp);
67 }