1/*
 2 * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
 3 * See LICENSE file for license details.
 4 */
 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{
17	void *res = calloc(1, size);
18
19	if(!res)
20		eprint("fatal: could not malloc() %u bytes\n", size);
21	return res;
22}
23
24void
25eprint(const char *errstr, ...)
26{
27	va_list ap;
28
29	va_start(ap, errstr);
30	vfprintf(stderr, errstr, ap);
31	va_end(ap);
32	exit(EXIT_FAILURE);
33}
34
35void *
36erealloc(void *ptr, unsigned int size)
37{
38	void *res = realloc(ptr, size);
39	if(!res)
40		eprint("fatal: could not malloc() %u bytes\n", size);
41	return res;
42}
43
44void
45spawn(Arg *arg)
46{
47	static char *shell = NULL;
48
49	if(!shell && !(shell = getenv("SHELL")))
50		shell = "/bin/sh";
51
52	if(!arg->cmd)
53		return;
54	/* the double-fork construct avoids zombie processes */
55	if(fork() == 0) {
56		if(fork() == 0) {
57			if(dpy)
58				close(ConnectionNumber(dpy));
59			setsid();
60			execl(shell, shell, "-c", arg->cmd, (char *)NULL);
61			fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg->cmd);
62			perror(" failed");
63		}
64		exit(0);
65	}
66	wait(0);
67}