138 lines
4.1 KiB
C
138 lines
4.1 KiB
C
/*
|
|
* 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(void);
|
|
static void usage(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(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(void)
|
|
{
|
|
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)
|
|
{
|
|
(void)fprintf(stderr, "usage: nohup [--] utility [arguments]\n");
|
|
exit(EXIT_MISC);
|
|
}
|