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