GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/nohup/nohup.c Lines: 0 32 0.0 %
Date: 2016-12-06 Branches: 0 26 0.0 %

Line Branch Exec Source
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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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}