#include "dwm.h"

#include <stdarg.h>

#include <stdio.h>

#include <stdlib.h>

#include <sys/wait.h>

#include <unistd.h>

/* extern */

void *

emallocz(unsigned int size) {

	void *res = calloc(1, size);

	if(!res)

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

	return res;

}

void

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

	va_list ap;

	va_start(ap, errstr);

	vfprintf(stderr, errstr, ap);

	va_end(ap);

	exit(EXIT_FAILURE);

}

void

spawn(const char *arg) {

	static char *shell = NULL;

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

		shell = "/bin/sh";

	if(!arg)

		return;

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

	 * clean from stupid signal handlers. */

	if(fork() == 0) {

		if(fork() == 0) {

			if(dpy)

				close(ConnectionNumber(dpy));

			setsid();

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

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

			perror(" failed");

		}

		exit(0);

	}

	wait(0);

}