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📄 Makefile(3.09 KB)
📄 Makefile.depend(274 B)
📄 _secure_path.3(2.52 KB)
📄 _secure_path.c(2.33 KB)
📄 auth.c(1.66 KB)
📄 expand_number.3(2.61 KB)
📄 expand_number.c(2.45 KB)
📄 flopen.3(3.35 KB)
📄 flopen.c(3.69 KB)
📄 fparseln.3(4.53 KB)
📄 fparseln.c(5.27 KB)
📄 getlocalbase.3(3.82 KB)
📄 getlocalbase.c(2.62 KB)
📄 gr_util.c(14.2 KB)
📄 hexdump.3(3.01 KB)
📄 hexdump.c(2.98 KB)
📄 humanize_number.3(5.65 KB)
📄 humanize_number.c(5.35 KB)
📄 kinfo_getallproc.3(2.47 KB)
📄 kinfo_getallproc.c(2.67 KB)
📄 kinfo_getfile.3(2.59 KB)
📄 kinfo_getfile.c(1.46 KB)
📄 kinfo_getproc.3(2.44 KB)
📄 kinfo_getproc.c(2.13 KB)
📄 kinfo_getvmmap.3(2.85 KB)
📄 kinfo_getvmmap.c(1.47 KB)
📄 kinfo_getvmobject.3(2.46 KB)
📄 kinfo_getvmobject.c(2.58 KB)
📄 kld.3(2.69 KB)
📄 kld.c(2.5 KB)
📄 libutil.h(8.04 KB)
📄 login.conf.5(16.41 KB)
📄 login_auth.3(2.3 KB)
📄 login_auth.c(3.01 KB)
📄 login_cap.3(16.04 KB)
📄 login_cap.c(19.22 KB)
📄 login_cap.h(6.25 KB)
📄 login_class.3(6.83 KB)
📄 login_class.c(14 KB)
📄 login_crypt.c(1.92 KB)
📄 login_ok.3(4.27 KB)
📄 login_ok.c(5.76 KB)
📄 login_times.3(5.28 KB)
📄 login_times.c(3.72 KB)
📄 login_tty.3(2.25 KB)
📄 login_tty.c(2.03 KB)
📄 pidfile.3(6.75 KB)
📄 pidfile.c(7.22 KB)
📄 property.3(2.91 KB)
📄 property.c(5.85 KB)
📄 pty.3(4.17 KB)
📄 pty.c(2.99 KB)
📄 pw_util.3(6.88 KB)
📄 pw_util.c(15.18 KB)
📄 quotafile.3(7.32 KB)
📄 quotafile.c(14.98 KB)
📄 realhostname.3(2.97 KB)
📄 realhostname.c(5.59 KB)
📄 realhostname_sa.3(4.56 KB)
📄 stub.c(1.73 KB)
📁 tests
📄 trimdomain.3(2.72 KB)
📄 trimdomain.c(3.39 KB)
📄 uucplock.3(4.94 KB)
📄 uucplock.c(5.5 KB)

Editing: pidfile.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/capsicum.h>
#include <sys/file.h>
#include <sys/stat.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <libutil.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

struct pidfh {
	int	pf_dirfd;
	int	pf_fd;
	char	pf_dir[MAXPATHLEN + 1];
	char	pf_filename[MAXPATHLEN + 1];
	dev_t	pf_dev;
	ino_t	pf_ino;
};

static int _pidfile_remove(struct pidfh *pfh, int freeit);

static int
pidfile_verify(const struct pidfh *pfh)
{
	struct stat sb;

if (pfh == NULL || pfh->pf_fd == -1)
		return (EDOOFUS);
	/*
	 * Check remembered descriptor.
	 */
	if (fstat(pfh->pf_fd, &sb) == -1)
		return (errno);
	if (sb.st_dev != pfh->pf_dev || sb.st_ino != pfh->pf_ino)
		return (EDOOFUS);
	return (0);
}

static int
pidfile_read(int dirfd, const char *filename, pid_t *pidptr)
{
	char buf[16], *endptr;
	int error, fd, i;

fd = openat(dirfd, filename, O_RDONLY | O_CLOEXEC);
	if (fd == -1)
		return (errno);

i = read(fd, buf, sizeof(buf) - 1);
	error = errno;	/* Remember errno in case close() wants to change it. */
	close(fd);
	if (i == -1)
		return (error);
	else if (i == 0)
		return (EAGAIN);
	buf[i] = '\0';

*pidptr = strtol(buf, &endptr, 10);
	if (endptr != &buf[i])
		return (EINVAL);

return (0);
}

struct pidfh *
pidfile_open(const char *pathp, mode_t mode, pid_t *pidptr)
{
	char path[MAXPATHLEN];
	struct pidfh *pfh;
	struct stat sb;
	int error, fd, dirfd, dirlen, filenamelen, count;
	struct timespec rqtp;
	cap_rights_t caprights;

pfh = malloc(sizeof(*pfh));
	if (pfh == NULL)
		return (NULL);

if (pathp == NULL) {
		dirlen = snprintf(pfh->pf_dir, sizeof(pfh->pf_dir),
		    "/var/run/");
		filenamelen = snprintf(pfh->pf_filename,
		    sizeof(pfh->pf_filename), "%s.pid", getprogname());
	} else {
		if (strlcpy(path, pathp, sizeof(path)) >= sizeof(path)) {
			free(pfh);
			errno = ENAMETOOLONG;
			return (NULL);
		}
		dirlen = strlcpy(pfh->pf_dir, dirname(path),
		    sizeof(pfh->pf_dir));
		(void)strlcpy(path, pathp, sizeof(path));
		filenamelen = strlcpy(pfh->pf_filename, basename(path),
		    sizeof(pfh->pf_filename));
	}

if (dirlen >= (int)sizeof(pfh->pf_dir) ||
	    filenamelen >= (int)sizeof(pfh->pf_filename)) {
		free(pfh);
		errno = ENAMETOOLONG;
		return (NULL);
	}

dirfd = open(pfh->pf_dir, O_CLOEXEC | O_DIRECTORY | O_NONBLOCK);
	if (dirfd == -1) {
		error = errno;
		free(pfh);
		errno = error;
		return (NULL);
	}

/*
	 * Open the PID file and obtain exclusive lock.
	 * We truncate PID file here only to remove old PID immediately,
	 * PID file will be truncated again in pidfile_write(), so
	 * pidfile_write() can be called multiple times.
	 */
	fd = flopenat(dirfd, pfh->pf_filename,
	    O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC | O_NONBLOCK, mode);
	if (fd == -1) {
		if (errno == EWOULDBLOCK) {
			if (pidptr == NULL) {
				errno = EEXIST;
			} else {
				count = 20;
				rqtp.tv_sec = 0;
				rqtp.tv_nsec = 5000000;
				for (;;) {
					errno = pidfile_read(dirfd,
					    pfh->pf_filename, pidptr);
					if (errno != EAGAIN || --count == 0)
						break;
					nanosleep(&rqtp, 0);
				}
				if (errno == EAGAIN)
					*pidptr = -1;
				if (errno == 0 || errno == EAGAIN)
					errno = EEXIST;
			}
		}
		error = errno;
		close(dirfd);
		free(pfh);
		errno = error;
		return (NULL);
	}

/*
	 * Remember file information, so in pidfile_write() we are sure we write
	 * to the proper descriptor.
	 */
	if (fstat(fd, &sb) == -1) {
		goto failed;
	}

if (cap_rights_limit(dirfd,
	    cap_rights_init(&caprights, CAP_UNLINKAT)) < 0 && errno != ENOSYS) {
		goto failed;
	}

if (cap_rights_limit(fd, cap_rights_init(&caprights, CAP_PWRITE,
	    CAP_FSTAT, CAP_FTRUNCATE, CAP_EVENT)) < 0 &&
	    errno != ENOSYS) {
		goto failed;
	}

pfh->pf_dirfd = dirfd;
	pfh->pf_fd = fd;
	pfh->pf_dev = sb.st_dev;
	pfh->pf_ino = sb.st_ino;

return (pfh);

failed:
	error = errno;
	unlinkat(dirfd, pfh->pf_filename, 0);
	close(dirfd);
	close(fd);
	free(pfh);
	errno = error;
	return (NULL);
}

int
pidfile_write(struct pidfh *pfh)
{
	char pidstr[16];
	int error, fd;

/*
	 * Check remembered descriptor, so we don't overwrite some other
	 * file if pidfile was closed and descriptor reused.
	 */
	errno = pidfile_verify(pfh);
	if (errno != 0) {
		/*
		 * Don't close descriptor, because we are not sure if it's ours.
		 */
		return (-1);
	}
	fd = pfh->pf_fd;

/*
	 * Truncate PID file, so multiple calls of pidfile_write() are allowed.
	 */
	if (ftruncate(fd, 0) == -1) {
		error = errno;
		_pidfile_remove(pfh, 0);
		errno = error;
		return (-1);
	}

snprintf(pidstr, sizeof(pidstr), "%u", getpid());
	if (pwrite(fd, pidstr, strlen(pidstr), 0) != (ssize_t)strlen(pidstr)) {
		error = errno;
		_pidfile_remove(pfh, 0);
		errno = error;
		return (-1);
	}

return (0);
}

int
pidfile_close(struct pidfh *pfh)
{
	int error;

error = pidfile_verify(pfh);
	if (error != 0) {
		errno = error;
		return (-1);
	}

if (close(pfh->pf_fd) == -1)
		error = errno;
	if (close(pfh->pf_dirfd) == -1 && error == 0)
		error = errno;

free(pfh);
	if (error != 0) {
		errno = error;
		return (-1);
	}
	return (0);
}

static int
_pidfile_remove(struct pidfh *pfh, int freeit)
{
	int error;

error = pidfile_verify(pfh);
	if (error != 0) {
		errno = error;
		return (-1);
	}

if (funlinkat(pfh->pf_dirfd, pfh->pf_filename, pfh->pf_fd, 0) == -1) {
		if (errno == EDEADLK)
			return (-1);
		error = errno;
	}
	if (close(pfh->pf_fd) == -1 && error == 0)
		error = errno;
	if (close(pfh->pf_dirfd) == -1 && error == 0)
		error = errno;
	if (freeit)
		free(pfh);
	else
		pfh->pf_fd = -1;
	if (error != 0) {
		errno = error;
		return (-1);
	}
	return (0);
}

int
pidfile_remove(struct pidfh *pfh)
{

return (_pidfile_remove(pfh, 1));
}

int
pidfile_fileno(const struct pidfh *pfh)
{

if (pfh == NULL || pfh->pf_fd == -1) {
		errno = EDOOFUS;
		return (-1);
	}
	return (pfh->pf_fd);
}

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Editing: pidfile.c

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