sbase/nohup.c
Laslo Hunhold e92a1aef54 Handle { NULL } argv[] properly in manual arg-reduction
Thanks izabera for reporting this!
2017-08-05 23:50:39 +02:00

46 lines
901 B
C

/* See LICENSE file for copyright and license details. */
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <unistd.h>
#include "util.h"
static void
usage(void)
{
eprintf("usage: %s cmd [arg ...]\n", argv0);
}
int
main(int argc, char *argv[])
{
int fd, savederrno;
argv0 = *argv, argv0 ? (argc--, argv++) : (void *)0;
if (!argc)
usage();
if (signal(SIGHUP, SIG_IGN) == SIG_ERR)
enprintf(127, "signal HUP:");
if (isatty(STDOUT_FILENO)) {
if ((fd = open("nohup.out", O_APPEND | O_CREAT, S_IRUSR | S_IWUSR)) < 0)
enprintf(127, "open nohup.out:");
if (dup2(fd, STDOUT_FILENO) < 0)
enprintf(127, "dup2:");
close(fd);
}
if (isatty(STDERR_FILENO) && dup2(STDOUT_FILENO, STDERR_FILENO) < 0)
enprintf(127, "dup2:");
execvp(argv[0], argv);
savederrno = errno;
weprintf("execvp %s:", argv[0]);
_exit(126 + (savederrno == ENOENT));
}