1/* © 2006-2007 Anselm R. Garbe <garbeam at gmail dot com>
 2 * © 2006-2007 Sander van Dijk <a dot h dot vandijk at gmail dot com>
 3 * © 2007 Premysl Hruby <dfenze at gmail dot com>
 4 * See LICENSE file for license details. */
 5#include "dwm.h"
 6#include <stdarg.h>
 7#include <stdio.h>
 8#include <stdlib.h>
 9#include <sys/wait.h>
10#include <unistd.h>
11
12/* extern */
13
14void *
15emallocz(unsigned int size) {
16	void *res = calloc(1, size);
17
18	if(!res)
19		eprint("fatal: could not malloc() %u bytes\n", size);
20	return res;
21}
22
23void
24eprint(const char *errstr, ...) {
25	va_list ap;
26
27	va_start(ap, errstr);
28	vfprintf(stderr, errstr, ap);
29	va_end(ap);
30	exit(EXIT_FAILURE);
31}
32
33void
34spawn(const char *arg) {
35	static char *shell = NULL;
36
37	if(!shell && !(shell = getenv("SHELL")))
38		shell = "/bin/sh";
39	if(!arg)
40		return;
41	/* The double-fork construct avoids zombie processes and keeps the code
42	 * clean from stupid signal handlers. */
43	if(fork() == 0) {
44		if(fork() == 0) {
45			if(dpy)
46				close(ConnectionNumber(dpy));
47			setsid();
48			execl(shell, shell, "-c", arg, (char *)NULL);
49			fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg);
50			perror(" failed");
51		}
52		exit(0);
53	}
54	wait(0);
55}