about summary refs log blame commit diff stats
path: root/util.c
blob: 7b94c50ca021923c1767e56cfab87f865aa386f4 (plain) (tree)
1
2
3
4
5
6
7
8
9
10

                                                                      
                                           
                


                   


                     
            
 
      
                             
                                    
 
                
                                                                     


                   
    
                                 
                   
 


                                     
                           


    
                        
                                  
 

                                                
                
                       

                                                                               



                                                             
                                 

                                                                             

                                          
                        


                
/* © 2006-2007 Anselm R. Garbe <garbeam at gmail dot com>
 * © 2006-2007 Sander van Dijk <a dot h dot vandijk at gmail dot com>
 * See LICENSE file for license details. */
#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);
}