dwm/dwm-3.6.1-10pba: util.c annotate

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

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