sbase

suckless unix tools
git clone git://git.2f30.org/sbase.git
Log | Files | Refs | README | LICENSE

nohup.c (890B)


      1 /* See LICENSE file for copyright and license details. */
      2 #include <sys/stat.h>
      3 
      4 #include <errno.h>
      5 #include <fcntl.h>
      6 #include <signal.h>
      7 #include <unistd.h>
      8 
      9 #include "util.h"
     10 
     11 static void
     12 usage(void)
     13 {
     14 	eprintf("usage: %s cmd [arg ...]\n", argv0);
     15 }
     16 
     17 int
     18 main(int argc, char *argv[])
     19 {
     20 	int fd, savederrno;
     21 
     22 	ARGBEGIN {
     23 	default:
     24 		usage();
     25 	} ARGEND
     26 
     27 	if (!argc)
     28 		usage();
     29 
     30 	if (signal(SIGHUP, SIG_IGN) == SIG_ERR)
     31 		enprintf(127, "signal HUP:");
     32 
     33 	if (isatty(STDOUT_FILENO)) {
     34 		if ((fd = open("nohup.out", O_APPEND | O_CREAT, S_IRUSR | S_IWUSR)) < 0)
     35 			enprintf(127, "open nohup.out:");
     36 		if (dup2(fd, STDOUT_FILENO) < 0)
     37 			enprintf(127, "dup2:");
     38 		close(fd);
     39 	}
     40 	if (isatty(STDERR_FILENO) && dup2(STDOUT_FILENO, STDERR_FILENO) < 0)
     41 		enprintf(127, "dup2:");
     42 
     43 	execvp(argv[0], argv);
     44 	savederrno = errno;
     45 	weprintf("execvp %s:", argv[0]);
     46 
     47 	_exit(126 + (savederrno == ENOENT));
     48 }