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[dwm.git] / util.c
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 /* static */
13
14 static void
15 bad_malloc(unsigned int size)
16 {
17         eprint("fatal: could not malloc() %u bytes\n", size);
18 }
19
20 /* extern */
21
22 void *
23 emallocz(unsigned int size)
24 {
25         void *res = calloc(1, size);
26
27         if(!res)
28                 bad_malloc(size);
29         return res;
30 }
31
32 void
33 eprint(const char *errstr, ...) {
34         va_list ap;
35
36         va_start(ap, errstr);
37         vfprintf(stderr, errstr, ap);
38         va_end(ap);
39         exit(EXIT_FAILURE);
40 }
41
42 void
43 spawn(Arg *arg)
44 {
45         char **argv = (char **)arg->argv;
46
47         if(!argv || !argv[0])
48                 return;
49         if(fork() == 0) {
50                 if(fork() == 0) {
51                         if(dpy)
52                                 close(ConnectionNumber(dpy));
53                         setsid();
54                         execvp(argv[0], argv);
55                         fprintf(stderr, "dwm: execvp %s", argv[0]);
56                         perror(" failed");
57                 }
58                 exit(0);
59         }
60         wait(0);
61 }