1 /* See LICENSE file for copyright and license details. */

     2 #include "dwm.h"

     3 #include <stdarg.h>

     4 #include <stdio.h>

     5 #include <stdlib.h>

     6 #include <sys/wait.h>

     7 #include <unistd.h>

     8 

     9 /* extern */

    10 

    11 void *

    12 emallocz(unsigned int size) {

    13 	void *res = calloc(1, size);

    14 

    15 	if(!res)

    16 		eprint("fatal: could not malloc() %u bytes\n", size);

    17 	return res;

    18 }

    19 

    20 void

    21 eprint(const char *errstr, ...) {

    22 	va_list ap;

    23 

    24 	va_start(ap, errstr);

    25 	vfprintf(stderr, errstr, ap);

    26 	va_end(ap);

    27 	exit(EXIT_FAILURE);

    28 }

    29 

    30 void

    31 spawn(const char *arg) {

    32 	static char *shell = NULL;

    33 

    34 	if(!shell && !(shell = getenv("SHELL")))

    35 		shell = "/bin/sh";

    36 	if(!arg)

    37 		return;

    38 	/* The double-fork construct avoids zombie processes and keeps the code

    39 	 * clean from stupid signal handlers. */

    40 	if(fork() == 0) {

    41 		if(fork() == 0) {

    42 			if(dpy)

    43 				close(ConnectionNumber(dpy));

    44 			setsid();

    45 			execl(shell, shell, "-c", arg, (char *)NULL);

    46 			fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg);

    47 			perror(" failed");

    48 		}

    49 		exit(0);

    50 	}

    51 	wait(0);

    52 }