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 #include <stdarg.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <sys/wait.h>
  10 #include <unistd.h>
  11
  12 /* static */
  13
  14 static void
  15 bad_malloc(unsigned int size)
  16 {
  17         eprint("fatal: could not malloc() %u bytes\n", size);
  18 }
  19
  20 /* extern */
  21
  22 void *
  23 emallocz(unsigned int size)
  24 {
  25         void *res = calloc(1, size);
  26
  27         if(!res)
  28                 bad_malloc(size);
  29         return res;
  30 }
  31
  32 void
  33 eprint(const char *errstr, ...) {
  34         va_list ap;
  35
  36         va_start(ap, errstr);
  37         vfprintf(stderr, errstr, ap);
  38         va_end(ap);
  39         exit(EXIT_FAILURE);
  40 }
  41
  42 void
  43 spawn(Arg *arg)
  44 {
  45         char **argv = (char **)arg->argv;
  46
  47         if(!argv || !argv[0])
  48                 return;
  49         if(fork() == 0) {
  50                 if(fork() == 0) {
  51                         if(dpy)
  52                                 close(ConnectionNumber(dpy));
  53                         setsid();
  54                         execvp(argv[0], argv);
  55                         fprintf(stderr, "dwm: execvp %s", argv[0]);
  56                         perror(" failed");
  57                 }
  58                 exit(0);
  59         }
  60         wait(0);
  61 }