140 lines
4.1 KiB
C
140 lines
4.1 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#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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#if 0
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static char sccsid[] = "@(#)nohup.c 8.1 (Berkeley) 6/6/93";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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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(argc, argv)
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int argc;
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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()
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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()
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{
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(void)fprintf(stderr, "usage: nohup [--] command [arguments]\n");
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exit(EXIT_MISC);
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}
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