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small stylistic fix
[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 {
35         va_list ap;
36
37         va_start(ap, errstr);
38         vfprintf(stderr, errstr, ap);
39         va_end(ap);
40         exit(EXIT_FAILURE);
41 }
42
43 void
44 spawn(Arg *arg)
45 {
46         char **argv = (char **)arg->argv;
47
48         if(!argv || !argv[0])
49                 return;
50         if(fork() == 0) {
51                 if(fork() == 0) {
52                         if(dpy)
53                                 close(ConnectionNumber(dpy));
54                         setsid();
55                         execvp(argv[0], argv);
56                         fprintf(stderr, "dwm: execvp %s", argv[0]);
57                         perror(" failed");
58                 }
59                 exit(0);
60         }
61         wait(0);
62 }