sbase/nohup.c

41 lines
988 B
C

/* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include "util.h"
enum { Error = 127, Found = 126 };
int
main(int argc, char *argv[])
{
int fd;
struct sigaction sa;
if(getopt(argc, argv, "") != -1)
exit(Error);
if(optind == argc)
enprintf(Error, "usage: %s command [argument...]\n", argv[0]);
sa.sa_handler = SIG_IGN;
if(sigaction(SIGHUP, &sa, NULL) == -1)
enprintf(Error, "sigaction HUP:");
if(isatty(STDOUT_FILENO)) {
if((fd = open("nohup.out", O_APPEND|O_CREAT, S_IRUSR|S_IWUSR)) == -1)
enprintf(Error, "open nohup.out:");
if(dup2(fd, STDOUT_FILENO) == -1)
enprintf(Error, "dup2:");
close(fd);
}
if(isatty(STDERR_FILENO))
if(dup2(STDOUT_FILENO, STDERR_FILENO) == -1)
enprintf(Error, "dup2:");
execvp(argv[optind], &argv[optind]);
enprintf(errno == ENOENT ? Error : Found, "exec %s:", argv[optind]);
return Error;
}