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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: flopen.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2007-2009 Dag-Erling Coïdan Smørgrav
 * 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
 *    in this position and unchanged.
 * 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 AUTHOR 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 AUTHOR 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/file.h>
#include <sys/stat.h>

#include <errno.h>
#include <stdarg.h>
#include <unistd.h>

#include <libutil.h>

/*
 * Reliably open and lock a file.
 *
 * Please do not modify this code without first reading the revision history
 * and discussing your changes with <des@freebsd.org>.  Don't be fooled by the
 * code's apparent simplicity; there would be no need for this function if it
 * was easy to get right.
 */
static int
vflopenat(int dirfd, const char *path, int flags, va_list ap)
{
	int fd, operation, serrno, trunc;
	struct stat sb, fsb;
	mode_t mode;

#ifdef O_EXLOCK
	flags &= ~O_EXLOCK;
#endif

mode = 0;
	if (flags & O_CREAT) {
		mode = (mode_t)va_arg(ap, int); /* mode_t promoted to int */
	}

operation = LOCK_EX;
        if (flags & O_NONBLOCK)
                operation |= LOCK_NB;

trunc = (flags & O_TRUNC);
	flags &= ~O_TRUNC;

for (;;) {
		if ((fd = openat(dirfd, path, flags, mode)) == -1)
			/* non-existent or no access */
			return (-1);
		if (flock(fd, operation) == -1) {
			/* unsupported or interrupted */
			serrno = errno;
			(void)close(fd);
			errno = serrno;
			return (-1);
		}
		if (fstatat(dirfd, path, &sb, 0) == -1) {
			/* disappeared from under our feet */
			(void)close(fd);
			continue;
		}
		if (fstat(fd, &fsb) == -1) {
			/* can't happen [tm] */
			serrno = errno;
			(void)close(fd);
			errno = serrno;
			return (-1);
		}
		if (sb.st_dev != fsb.st_dev ||
		    sb.st_ino != fsb.st_ino) {
			/* changed under our feet */
			(void)close(fd);
			continue;
		}
		if (trunc && ftruncate(fd, 0) != 0) {
			/* can't happen [tm] */
			serrno = errno;
			(void)close(fd);
			errno = serrno;
			return (-1);
		}
		/*
		 * The following change is provided as a specific example to
		 * avoid.
		 */
#if 0
		if (fcntl(fd, F_SETFD, FD_CLOEXEC) != 0) {
			serrno = errno;
			(void)close(fd);
			errno = serrno;
			return (-1);
		}
#endif
		return (fd);
	}
}

int
flopen(const char *path, int flags, ...)
{
	va_list ap;
	int ret;

va_start(ap, flags);
	ret = vflopenat(AT_FDCWD, path, flags, ap);
	va_end(ap);
	return (ret);
}

int
flopenat(int dirfd, const char *path, int flags, ...)
{
	va_list ap;
	int ret;

va_start(ap, flags);
	ret = vflopenat(dirfd, path, flags, ap);
	va_end(ap);
	return (ret);
}

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Editing: flopen.c

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