annotate util.c @ 13:c65d4f8dc8fd
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paulo |
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Sat, 12 Mar 2016 23:30:00 -0800 |
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7024076fa948 |
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1 /* (C)opyright MMVI-MMVII Anselm R. Garbe <garbeam at gmail dot com>
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2 * See LICENSE file for license details.
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3 */
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4 #include "dwm.h"
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5 #include <stdarg.h>
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6 #include <stdio.h>
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7 #include <stdlib.h>
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8 #include <sys/wait.h>
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9 #include <unistd.h>
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10
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11 /* extern */
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12
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13 void *
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14 emallocz(unsigned int size) {
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15 void *res = calloc(1, size);
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16
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17 if(!res)
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18 eprint("fatal: could not malloc() %u bytes\n", size);
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19 return res;
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20 }
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21
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22 void
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23 eprint(const char *errstr, ...) {
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24 va_list ap;
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25
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26 va_start(ap, errstr);
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27 vfprintf(stderr, errstr, ap);
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28 va_end(ap);
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29 exit(EXIT_FAILURE);
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30 }
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31
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32 void
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33 spawn(Arg *arg) {
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34 static char *shell = NULL;
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35
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36 if(!shell && !(shell = getenv("SHELL")))
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37 shell = "/bin/sh";
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38 if(!arg->cmd)
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39 return;
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40 /* The double-fork construct avoids zombie processes and keeps the code
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41 * clean from stupid signal handlers. */
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42 if(fork() == 0) {
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43 if(fork() == 0) {
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44 if(dpy)
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45 close(ConnectionNumber(dpy));
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46 setsid();
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47 execl(shell, shell, "-c", arg->cmd, (char *)NULL);
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48 fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg->cmd);
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49 perror(" failed");
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50 }
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51 exit(0);
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52 }
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53 wait(0);
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54 }
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55
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56 void
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57 spawn_insert(Arg *arg) {
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58 func_insert(spawn, arg);
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59 }
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