aewl
view util.c @ 567:7e92f58754ae
nah reverting to my prev style, that's really the best
| author | arg@mig29 |
|---|---|
| date | Sat, 18 Nov 2006 21:33:33 +0100 |
| parents | 740c4bfc3124 |
| children | e90bf387bf6f |
line source
1 /* (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
2 * See LICENSE file for license details.
3 */
4 #include "dwm.h"
5 #include <stdarg.h>
6 #include <stdio.h>
7 #include <stdlib.h>
8 #include <sys/wait.h>
9 #include <unistd.h>
11 /* extern */
13 void *
14 emallocz(unsigned int size) {
15 void *res = calloc(1, size);
17 if(!res)
18 eprint("fatal: could not malloc() %u bytes\n", size);
19 return res;
20 }
22 void
23 eprint(const char *errstr, ...) {
24 va_list ap;
26 va_start(ap, errstr);
27 vfprintf(stderr, errstr, ap);
28 va_end(ap);
29 exit(EXIT_FAILURE);
30 }
32 void *
33 erealloc(void *ptr, unsigned int size) {
34 void *res = realloc(ptr, size);
36 if(!res)
37 eprint("fatal: could not malloc() %u bytes\n", size);
38 return res;
39 }
41 void
42 spawn(Arg *arg) {
43 static char *shell = NULL;
45 if(!shell && !(shell = getenv("SHELL")))
46 shell = "/bin/sh";
47 if(!arg->cmd)
48 return;
49 /* The double-fork construct avoids zombie processes and keeps the code
50 * clean from stupid signal handlers. */
51 if(fork() == 0) {
52 if(fork() == 0) {
53 if(dpy)
54 close(ConnectionNumber(dpy));
55 setsid();
56 execl(shell, shell, "-c", arg->cmd, (char *)NULL);
57 fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg->cmd);
58 perror(" failed");
59 }
60 exit(0);
61 }
62 wait(0);
63 }