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/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)nohup.c 8.1 (Berkeley) 6/6/93";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <sys/param.h>
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static void dofile __P((void));
static void usage __P((void));
#define FILENAME "nohup.out"
/*
* POSIX mandates that we exit with:
* 126 - If the utility was found, but failed to execute.
* 127 - If any other error occurred.
*/
#define EXIT_NOEXEC 126
#define EXIT_NOTFOUND 127
#define EXIT_MISC 127
int
main(argc, argv)
int argc;
char *argv[];
{
int exit_status;
while (getopt(argc, argv, "") != -1)
usage();
argc -= optind;
argv += optind;
if (argc < 1)
usage();
if (isatty(STDOUT_FILENO))
dofile();
if (isatty(STDERR_FILENO) && dup2(STDOUT_FILENO, STDERR_FILENO) == -1)
/* may have just closed stderr */
err(EXIT_MISC, "%s", argv[0]);
(void)signal(SIGHUP, SIG_IGN);
execvp(*argv, argv);
exit_status = (errno == ENOENT) ? EXIT_NOTFOUND : EXIT_NOEXEC;
err(exit_status, "%s", argv[0]);
}
static void
dofile()
{
int fd;
char path[MAXPATHLEN];
const char *p;
/*
* POSIX mandates if the standard output is a terminal, the standard
* output is appended to nohup.out in the working directory. Failing
* that, it will be appended to nohup.out in the directory obtained
* from the HOME environment variable. If file creation is required,
* the mode_t is set to S_IRUSR | S_IWUSR.
*/
p = FILENAME;
fd = open(p, O_RDWR | O_CREAT | O_APPEND, S_IRUSR | S_IWUSR);
if (fd != -1)
goto dupit;
if ((p = getenv("HOME")) != NULL && *p != '\0' &&
(size_t)snprintf(path, sizeof(path), "%s/%s", p, FILENAME) <
sizeof(path)) {
fd = open(p = path, O_RDWR | O_CREAT | O_APPEND,
S_IRUSR | S_IWUSR);
if (fd != -1)
goto dupit;
}
errx(EXIT_MISC, "can't open a nohup.out file");
dupit:
if (dup2(fd, STDOUT_FILENO) == -1)
err(EXIT_MISC, NULL);
(void)fprintf(stderr, "appending output to %s\n", p);
}
static void
usage()
{
(void)fprintf(stderr, "usage: nohup [--] command [arguments]\n");
exit(EXIT_MISC);
}
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