143 lines
4.5 KiB
C
143 lines
4.5 KiB
C
/* $NetBSD: nohup.c,v 1.15 2011/09/06 18:24:15 joerg Exp $ */
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/*
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* Copyright (c) 1989 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1989\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)nohup.c 5.4 (Berkeley) 6/1/90";
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#endif
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__RCSID("$NetBSD: nohup.c,v 1.15 2011/09/06 18:24:15 joerg Exp $");
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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static void dofile(void);
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__dead static void usage(void);
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/* nohup shall exit with one of the following values:
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126 - The utility was found but could not be invoked.
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127 - An error occurred in the nohup utility, or the utility could
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not be found. */
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#define EXIT_NOEXEC 126
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#define EXIT_NOTFOUND 127
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#define EXIT_MISC 127
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int
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main(int argc, char **argv)
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{
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int exit_status;
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while (getopt(argc, argv, "") != -1) {
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc < 1)
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usage();
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if (isatty(STDOUT_FILENO))
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dofile();
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if (isatty(STDERR_FILENO) && dup2(STDOUT_FILENO, STDERR_FILENO) == -1) {
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/* may have just closed stderr */
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(void)fprintf(stdin, "nohup: %s\n", strerror(errno));
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exit(EXIT_MISC);
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}
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/* The nohup utility shall take the standard action for all signals
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except that SIGHUP shall be ignored. */
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(void)signal(SIGHUP, SIG_IGN);
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execvp(argv[0], &argv[0]);
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exit_status = (errno == ENOENT) ? EXIT_NOTFOUND : EXIT_NOEXEC;
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(void)fprintf(stderr, "nohup: %s: %s\n", argv[0], strerror(errno));
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exit(exit_status);
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}
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static void
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dofile(void)
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{
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int fd;
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char path[MAXPATHLEN];
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const char *p;
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/* If the standard output is a terminal, all output written to
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its standard output shall be appended to the end of the file
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nohup.out in the current directory. If nohup.out cannot be
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created or opened for appending, the output shall be appended
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to the end of the file nohup.out in the directory specified
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by the HOME environment variable.
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If a file is created, the file's permission bits shall be
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set to S_IRUSR | S_IWUSR. */
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#define FILENAME "nohup.out"
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p = FILENAME;
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if ((fd = open(p, O_RDWR|O_CREAT|O_APPEND, S_IRUSR|S_IWUSR)) >= 0)
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goto dupit;
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if ((p = getenv("HOME")) != NULL) {
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(void)strlcpy(path, p, sizeof(path));
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(void)strlcat(path, "/", sizeof(path));
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(void)strlcat(path, FILENAME, sizeof(path));
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if ((fd = open(p = path, O_RDWR|O_CREAT|O_APPEND, S_IRUSR|S_IWUSR)) >= 0)
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goto dupit;
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}
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(void)fprintf(stderr, "nohup: can't open a nohup.out file.\n");
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exit(EXIT_MISC);
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dupit: (void)lseek(fd, 0L, SEEK_END);
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if (dup2(fd, STDOUT_FILENO) == -1) {
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(void)fprintf(stderr, "nohup: %s\n", strerror(errno));
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exit(EXIT_MISC);
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}
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(void)fprintf(stderr, "sending output to %s\n", p);
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "usage: nohup utility [argument ...]\n");
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exit(EXIT_MISC);
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}
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