From 5b57d28ffb6e1ef86b50f7d05d977826eae89bfe Mon Sep 17 00:00:00 2001 From: Kiyoshi Aman Date: Fri, 1 Feb 2019 22:55:37 +0000 Subject: initial population --- usr.bin/nohup/nohup.c | 142 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 142 insertions(+) create mode 100644 usr.bin/nohup/nohup.c (limited to 'usr.bin/nohup/nohup.c') diff --git a/usr.bin/nohup/nohup.c b/usr.bin/nohup/nohup.c new file mode 100644 index 0000000..d177c51 --- /dev/null +++ b/usr.bin/nohup/nohup.c @@ -0,0 +1,142 @@ +/* $NetBSD: nohup.c,v 1.15 2011/09/06 18:24:15 joerg Exp $ */ + +/* + * Copyright (c) 1989 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. 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. + */ + +#include +#ifndef lint +__COPYRIGHT("@(#) Copyright (c) 1989\ + The Regents of the University of California. All rights reserved."); +#endif /* not lint */ + +#ifndef lint +#if 0 +static char sccsid[] = "@(#)nohup.c 5.4 (Berkeley) 6/1/90"; +#endif +__RCSID("$NetBSD: nohup.c,v 1.15 2011/09/06 18:24:15 joerg Exp $"); +#endif /* not lint */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static void dofile(void); +__dead static void usage(void); + +/* nohup shall exit with one of the following values: + 126 - The utility was found but could not be invoked. + 127 - An error occurred in the nohup utility, or the utility could + not be found. */ +#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 */ + (void)fprintf(stdin, "nohup: %s\n", strerror(errno)); + exit(EXIT_MISC); + } + + /* The nohup utility shall take the standard action for all signals + except that SIGHUP shall be ignored. */ + (void)signal(SIGHUP, SIG_IGN); + + execvp(argv[0], &argv[0]); + exit_status = (errno == ENOENT) ? EXIT_NOTFOUND : EXIT_NOEXEC; + (void)fprintf(stderr, "nohup: %s: %s\n", argv[0], strerror(errno)); + exit(exit_status); +} + +static void +dofile(void) +{ + int fd; + char path[MAXPATHLEN]; + const char *p; + + /* If the standard output is a terminal, all output written to + its standard output shall be appended to the end of the file + nohup.out in the current directory. If nohup.out cannot be + created or opened for appending, the output shall be appended + to the end of the file nohup.out in the directory specified + by the HOME environment variable. + + If a file is created, the file's permission bits shall be + set to S_IRUSR | S_IWUSR. */ +#define FILENAME "nohup.out" + p = FILENAME; + if ((fd = open(p, O_RDWR|O_CREAT|O_APPEND, S_IRUSR|S_IWUSR)) >= 0) + goto dupit; + if ((p = getenv("HOME")) != NULL) { + (void)strlcpy(path, p, sizeof(path)); + (void)strlcat(path, "/", sizeof(path)); + (void)strlcat(path, FILENAME, sizeof(path)); + if ((fd = open(p = path, O_RDWR|O_CREAT|O_APPEND, S_IRUSR|S_IWUSR)) >= 0) + goto dupit; + } + (void)fprintf(stderr, "nohup: can't open a nohup.out file.\n"); + exit(EXIT_MISC); + +dupit: (void)lseek(fd, 0L, SEEK_END); + if (dup2(fd, STDOUT_FILENO) == -1) { + (void)fprintf(stderr, "nohup: %s\n", strerror(errno)); + exit(EXIT_MISC); + } + (void)fprintf(stderr, "sending output to %s\n", p); +} + +static void +usage(void) +{ + (void)fprintf(stderr, "usage: nohup utility [argument ...]\n"); + exit(EXIT_MISC); +} -- cgit v1.2.3-60-g2f50