arg@644: /* (C)opyright MMVI-MMVII Anselm R. Garbe <garbeam at gmail dot com>
garbeam@2:  * See LICENSE file for license details.
garbeam@2:  */
garbeam@76: #include "dwm.h"
garbeam@2: #include <stdarg.h>
garbeam@2: #include <stdio.h>
garbeam@2: #include <stdlib.h>
garbeam@5: #include <sys/wait.h>
garbeam@5: #include <unistd.h>
garbeam@5: 
garbeam@84: /* extern */
garbeam@76: 
garbeam@3: void *
arg@461: emallocz(unsigned int size) {
garbeam@3: 	void *res = calloc(1, size);
arg@123: 
garbeam@3: 	if(!res)
arg@325: 		eprint("fatal: could not malloc() %u bytes\n", size);
garbeam@3: 	return res;
garbeam@3: }
garbeam@3: 
garbeam@3: void
arg@461: eprint(const char *errstr, ...) {
garbeam@76: 	va_list ap;
arg@123: 
garbeam@76: 	va_start(ap, errstr);
garbeam@76: 	vfprintf(stderr, errstr, ap);
garbeam@76: 	va_end(ap);
garbeam@92: 	exit(EXIT_FAILURE);
garbeam@76: }
garbeam@76: 
garbeam@76: void
arg@461: spawn(Arg *arg) {
arg@189: 	static char *shell = NULL;
arg@123: 
arg@189: 	if(!shell && !(shell = getenv("SHELL")))
arg@189: 		shell = "/bin/sh";
arg@189: 	if(!arg->cmd)
garbeam@5: 		return;
arg@471: 	/* The double-fork construct avoids zombie processes and keeps the code
arg@471: 	 * clean from stupid signal handlers. */
garbeam@5: 	if(fork() == 0) {
garbeam@5: 		if(fork() == 0) {
garbeam@5: 			if(dpy)
garbeam@5: 				close(ConnectionNumber(dpy));
garbeam@9: 			setsid();
arg@338: 			execl(shell, shell, "-c", arg->cmd, (char *)NULL);
arg@217: 			fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg->cmd);
garbeam@5: 			perror(" failed");
garbeam@5: 		}
arg@138: 		exit(0);
garbeam@5: 	}
garbeam@5: 	wait(0);
garbeam@5: }