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 badmalloc(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                 badmalloc(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 erealloc(void *ptr, unsigned int size)
  45 {
  46         void *res = realloc(ptr, size);
  47         if(!res)
  48                 badmalloc(size);
  49         return res;
  50 }
  51
  52 void
  53 spawn(Arg *arg)
  54 {
  55         static char *shell = NULL;
  56
  57         if(!shell && !(shell = getenv("SHELL")))
  58                 shell = "/bin/sh";
  59
  60         if(!arg->cmd)
  61                 return;
  62         if(fork() == 0) {
  63                 if(fork() == 0) {
  64                         if(dpy)
  65                                 close(ConnectionNumber(dpy));
  66                         setsid();
  67                         execl(shell, shell, "-c", arg->cmd, NULL);
  68                         fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg->cmd);
  69                         perror(" failed");
  70                 }
  71                 exit(0);
  72         }
  73         wait(0);
  74 }