1/* © 2004-2007 Anselm R. Garbe <garbeam at gmail dot com>
 2 * See LICENSE file for license details. */
 3#include "dwm.h"
 4#include <stdarg.h>
 5#include <stdio.h>
 6#include <stdlib.h>
 7#include <sys/wait.h>
 8#include <unistd.h>
 9
10/* extern */
11
12void *
13emallocz(unsigned int size) {
14	void *res = calloc(1, size);
15
16	if(!res)
17		eprint("fatal: could not malloc() %u bytes\n", size);
18	return res;
19}
20
21void
22eprint(const char *errstr, ...) {
23	va_list ap;
24
25	va_start(ap, errstr);
26	vfprintf(stderr, errstr, ap);
27	va_end(ap);
28	exit(EXIT_FAILURE);
29}
30
31void
32spawn(const char *arg) {
33	static char *shell = NULL;
34
35	if(!shell && !(shell = getenv("SHELL")))
36		shell = "/bin/sh";
37	if(!arg)
38		return;
39	/* The double-fork construct avoids zombie processes and keeps the code
40	 * clean from stupid signal handlers. */
41	if(fork() == 0) {
42		if(fork() == 0) {
43			if(dpy)
44				close(ConnectionNumber(dpy));
45			setsid();
46			execl(shell, shell, "-c", arg, (char *)NULL);
47			fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg);
48			perror(" failed");
49		}
50		exit(0);
51	}
52	wait(0);
53}