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         fprintf(stderr, "fatal: could not malloc() %d bytes\n",
  19                         (int) size);
  20         exit(EXIT_FAILURE);
  21 }
  22
  23 /* extern */
  24
  25 void *
  26 emallocz(unsigned int size)
  27 {
  28         void *res = calloc(1, size);
  29
  30         if(!res)
  31                 bad_malloc(size);
  32         return res;
  33 }
  34
  35 void
  36 eprint(const char *errstr, ...) {
  37         va_list ap;
  38
  39         va_start(ap, errstr);
  40         vfprintf(stderr, errstr, ap);
  41         va_end(ap);
  42         exit(EXIT_FAILURE);
  43 }
  44
  45 void
  46 spawn(Arg *arg)
  47 {
  48         char **argv = (char **)arg->argv;
  49
  50         if(!argv || !argv[0])
  51                 return;
  52         if(fork() == 0) {
  53                 if(fork() == 0) {
  54                         if(dpy)
  55                                 close(ConnectionNumber(dpy));
  56                         setsid();
  57                         execvp(argv[0], argv);
  58                         fprintf(stderr, "dwm: execvp %s", argv[0]);
  59                         perror(" failed");
  60                 }
  61                 exit(EXIT_FAILURE);
  62         }
  63         wait(0);
  64 }