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/* $OpenBSD: nohup.c,v 1.16 2015/11/09 16:52:32 deraadt Exp $ */ |
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/* $NetBSD: nohup.c,v 1.6 1995/08/31 23:35:25 jtc 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/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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#include <limits.h> |
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#include <err.h> |
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static void dofile(void); |
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__dead static void usage(void); |
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/* |
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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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*/ |
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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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/* |
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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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* |
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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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*/ |
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#define FILENAME "nohup.out" |
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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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if (pledge("stdio rpath wpath cpath exec", NULL) == -1) |
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err(1, "pledge"); |
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if (argc < 2) |
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usage(); |
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if (isatty(STDOUT_FILENO)) |
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dofile(); |
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if (pledge("stdio exec wpath cpath rpath", NULL) == -1) |
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err(1, "pledge"); |
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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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/* |
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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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*/ |
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(void)signal(SIGHUP, SIG_IGN); |
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execvp(argv[1], &argv[1]); |
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exit_status = (errno == ENOENT) ? EXIT_NOTFOUND : EXIT_NOEXEC; |
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err(exit_status, "%s", argv[1]); |
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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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const char *p; |
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char path[PATH_MAX]; |
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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 && *p != '\0' && |
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(strlen(p) + strlen(FILENAME) + 1) < sizeof(path)) { |
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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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errx(EXIT_MISC, "can't open a nohup.out file"); |
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dupit: |
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(void)lseek(fd, (off_t)0, SEEK_END); |
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if (dup2(fd, STDOUT_FILENO) == -1) |
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err(EXIT_MISC, NULL); |
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(void)fprintf(stderr, "sending output to %s\n", p); |
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} |
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__dead static void |
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usage(void) |
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{ |
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(void)fprintf(stderr, "usage: nohup utility [arg ...]\n"); |
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exit(EXIT_MISC); |
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} |