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annotate util.c @ 510:0dfa6b752aed

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small fix of a corner case
author Anselm R. Garbe <arg@10kloc.org>
date Fri, 29 Sep 2006 16:54:15 +0200
parents 740c4bfc3124
children 651f2c868b31
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1 /*
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2 * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
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3 * See LICENSE file for license details.
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4 */
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5 #include "dwm.h"
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6 #include <stdarg.h>
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <sys/wait.h>
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10 #include <unistd.h>
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12 /* extern */
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14 void *
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15 emallocz(unsigned int size) {
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16 void *res = calloc(1, size);
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18 if(!res)
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19 eprint("fatal: could not malloc() %u bytes\n", size);
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20 return res;
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21 }
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23 void
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24 eprint(const char *errstr, ...) {
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25 va_list ap;
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26
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27 va_start(ap, errstr);
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28 vfprintf(stderr, errstr, ap);
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29 va_end(ap);
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30 exit(EXIT_FAILURE);
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31 }
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32
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33 void *
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34 erealloc(void *ptr, unsigned int size) {
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35 void *res = realloc(ptr, size);
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36 if(!res)
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37 eprint("fatal: could not malloc() %u bytes\n", size);
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38 return res;
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39 }
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40
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41 void
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42 spawn(Arg *arg) {
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43 static char *shell = NULL;
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44
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45 if(!shell && !(shell = getenv("SHELL")))
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46 shell = "/bin/sh";
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47
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48 if(!arg->cmd)
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49 return;
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50 /* The double-fork construct avoids zombie processes and keeps the code
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51 * clean from stupid signal handlers. */
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52 if(fork() == 0) {
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53 if(fork() == 0) {
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54 if(dpy)
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55 close(ConnectionNumber(dpy));
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56 setsid();
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57 execl(shell, shell, "-c", arg->cmd, (char *)NULL);
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58 fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg->cmd);
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59 perror(" failed");
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60 }
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61 exit(0);
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62 }
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63 wait(0);
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64 }