annotate util.c @ 380:4bf79305d675
this algorithm seems to keep order for any scenario
| author |
Anselm R. Garbe <arg@10kloc.org> |
| date |
Tue, 29 Aug 2006 09:57:57 +0200 |
| parents |
06438e022f9a |
| children |
9d23330a5268 |
| rev |
line source |
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garbeam@2
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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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11
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12 /* extern */
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13
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14 void *
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15 emallocz(unsigned int size)
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16 {
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17 void *res = calloc(1, size);
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18
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19 if(!res)
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20 eprint("fatal: could not malloc() %u bytes\n", size);
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21 return res;
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22 }
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23
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24 void
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25 eprint(const char *errstr, ...)
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26 {
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27 va_list ap;
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28
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29 va_start(ap, errstr);
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30 vfprintf(stderr, errstr, ap);
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31 va_end(ap);
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32 exit(EXIT_FAILURE);
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33 }
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34
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35 void *
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36 erealloc(void *ptr, unsigned int size)
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37 {
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38 void *res = realloc(ptr, size);
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39 if(!res)
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40 eprint("fatal: could not malloc() %u bytes\n", size);
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41 return res;
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42 }
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43
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44 void
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45 spawn(Arg *arg)
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46 {
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47 static char *shell = NULL;
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48
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49 if(!shell && !(shell = getenv("SHELL")))
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50 shell = "/bin/sh";
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51
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52 if(!arg->cmd)
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53 return;
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54 /* the double-fork construct avoids zombie processes */
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55 if(fork() == 0) {
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56 if(fork() == 0) {
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57 if(dpy)
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58 close(ConnectionNumber(dpy));
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59 setsid();
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arg@338
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60 execl(shell, shell, "-c", arg->cmd, (char *)NULL);
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61 fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg->cmd);
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62 perror(" failed");
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63 }
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64 exit(0);
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65 }
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66 wait(0);
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67 }
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