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some cleanups/fixes inspired by Jukka Salmi's feedback
[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
7 #include <stdarg.h>
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <sys/wait.h>
11 #include <unistd.h>
12
13 /* static */
14
15 static void
16 bad_malloc(unsigned int size)
17 {
18         eprint("fatal: could not malloc() %u bytes\n", size);
19 }
20
21 /* extern */
22
23 void *
24 emallocz(unsigned int size)
25 {
26         void *res = calloc(1, size);
27
28         if(!res)
29                 bad_malloc(size);
30         return res;
31 }
32
33 void
34 eprint(const char *errstr, ...) {
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 }