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 {
  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         static char *shell = NULL;
  47
  48         if(!shell && !(shell = getenv("SHELL")))
  49                 shell = "/bin/sh";
  50
  51         if(!arg->cmd)
  52                 return;
  53         if(fork() == 0) {
  54                 if(fork() == 0) {
  55                         if(dpy)
  56                                 close(ConnectionNumber(dpy));
  57                         setsid();
  58                         execl(shell, shell, "-c", arg->cmd, NULL);
  59                         fprintf(stderr, "dwm: execl '%s'", arg->cmd);
  60                         perror(" failed");
  61                 }
  62                 exit(0);
  63         }
  64         wait(0);
  65 }