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annotate util.c @ 712:b288b57d81f8

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this version should also work with cornercases (like unmanage during !issel, etc.)
author Anselm R. Garbe <arg@suckless.org>
date Tue, 23 Jan 2007 12:00:49 +0100
parents 1ed8c40dde36
children 743061dbe7f2
rev   line source
arg@644 1 /* (C)opyright MMVI-MMVII Anselm R. Garbe <garbeam at gmail dot com>
garbeam@2 2 * See LICENSE file for license details.
garbeam@2 3 */
garbeam@76 4 #include "dwm.h"
garbeam@2 5 #include <stdarg.h>
garbeam@2 6 #include <stdio.h>
garbeam@2 7 #include <stdlib.h>
garbeam@5 8 #include <sys/wait.h>
garbeam@5 9 #include <unistd.h>
garbeam@5 10
garbeam@84 11 /* extern */
garbeam@76 12
garbeam@3 13 void *
arg@461 14 emallocz(unsigned int size) {
garbeam@3 15 void *res = calloc(1, size);
arg@123 16
garbeam@3 17 if(!res)
arg@325 18 eprint("fatal: could not malloc() %u bytes\n", size);
garbeam@3 19 return res;
garbeam@3 20 }
garbeam@3 21
garbeam@3 22 void
arg@461 23 eprint(const char *errstr, ...) {
garbeam@76 24 va_list ap;
arg@123 25
garbeam@76 26 va_start(ap, errstr);
garbeam@76 27 vfprintf(stderr, errstr, ap);
garbeam@76 28 va_end(ap);
garbeam@92 29 exit(EXIT_FAILURE);
garbeam@76 30 }
garbeam@76 31
garbeam@76 32 void
arg@461 33 spawn(Arg *arg) {
arg@189 34 static char *shell = NULL;
arg@123 35
arg@189 36 if(!shell && !(shell = getenv("SHELL")))
arg@189 37 shell = "/bin/sh";
arg@189 38 if(!arg->cmd)
garbeam@5 39 return;
arg@471 40 /* The double-fork construct avoids zombie processes and keeps the code
arg@471 41 * clean from stupid signal handlers. */
garbeam@5 42 if(fork() == 0) {
garbeam@5 43 if(fork() == 0) {
garbeam@5 44 if(dpy)
garbeam@5 45 close(ConnectionNumber(dpy));
garbeam@9 46 setsid();
arg@338 47 execl(shell, shell, "-c", arg->cmd, (char *)NULL);
arg@217 48 fprintf(stderr, "dwm: execl '%s -c %s'", shell, arg->cmd);
garbeam@5 49 perror(" failed");
garbeam@5 50 }
arg@138 51 exit(0);
garbeam@5 52 }
garbeam@5 53 wait(0);
garbeam@5 54 }