fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
134 lines
3.9 KiB
C
134 lines
3.9 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. 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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#if 0
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1989, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)nohup.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.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 <unistd.h>
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static void dofile(void);
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static void usage(void);
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#define FILENAME "nohup.out"
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/*
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* POSIX mandates that we exit with:
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* 126 - If the utility was found, but failed to execute.
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* 127 - If any other error occurred.
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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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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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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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err(EXIT_MISC, "%s", argv[0]);
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(void)signal(SIGHUP, SIG_IGN);
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execvp(*argv, argv);
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exit_status = (errno == ENOENT) ? EXIT_NOTFOUND : EXIT_NOEXEC;
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err(exit_status, "%s", argv[0]);
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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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/*
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* POSIX mandates if the standard output is a terminal, the standard
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* output is appended to nohup.out in the working directory. Failing
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* that, it will be appended to nohup.out in the directory obtained
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* from the HOME environment variable. If file creation is required,
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* the mode_t is set to S_IRUSR | S_IWUSR.
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*/
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p = FILENAME;
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fd = open(p, O_RDWR | O_CREAT | O_APPEND, S_IRUSR | S_IWUSR);
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if (fd != -1)
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goto dupit;
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if ((p = getenv("HOME")) != NULL && *p != '\0' &&
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(size_t)snprintf(path, sizeof(path), "%s/%s", p, FILENAME) <
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sizeof(path)) {
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fd = open(p = path, O_RDWR | O_CREAT | O_APPEND,
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S_IRUSR | S_IWUSR);
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if (fd != -1)
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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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if (dup2(fd, STDOUT_FILENO) == -1)
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err(EXIT_MISC, NULL);
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(void)fprintf(stderr, "appending 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 [arguments]\n");
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exit(EXIT_MISC);
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}
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