diff options
Diffstat (limited to 'util.c')
-rw-r--r-- | util.c | 62 |
1 files changed, 62 insertions, 0 deletions
@@ -0,0 +1,62 @@ +/* (C)opyright MMVI-MMVII Anselm R. Garbe <garbeam at gmail dot com> + * (C)opyright MMVII Robert Manea <rob dot manea at gmail dot com> + * See LICENSE file for license details. + */ + +#include "dzen.h" +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/wait.h> +#include <unistd.h> + +void * +emalloc(unsigned int size) { + void *res = malloc(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); +} + +char * +estrdup(const char *str) { + void *res = strdup(str); + + if(!res) + eprint("fatal: could not malloc() %u bytes\n", strlen(str)); + return res; +} +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) { + setsid(); + execl(shell, shell, "-c", arg, (char *)NULL); + fprintf(stderr, "dzen: execl '%s -c %s'", shell, arg); + perror(" failed"); + } + exit(0); + } + wait(0); +} + |