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#!/bin/sh
#
# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
#
# Copyright (c) 2021 Konstantin Belousov <kib@FreeBSD.org>
#
# 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 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.
#
# Test of open(2) with the O_RESOLVE_BENEATH flag.
# userret: returning with the following locks held:
# shared lockmgr ufs (ufs) r = 0 (0xfffff804ec0d2a48) locked @
# kern/vfs_subr.c:2590 seen in WiP code:
# https://people.freebsd.org/~pho/stress/log/kostik1126.txt
top=/tmp/beneath.d
mkdir -p $top
cat > $top/beneath.c <<EOF
/* $Id: beneath.c,v 1.1 2018/10/13 16:53:02 kostik Exp kostik $ */
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
int
main(int argc, char *argv[])
{
struct stat st;
char *name;
int error, fd, i;
for (i = 1; i < argc; i++) {
name = argv[i];
alarm(120);
fd = open(name, O_RDONLY | O_RESOLVE_BENEATH);
if (fd == -1) {
fprintf(stderr, "open(\"%s\") failed, error %d %s\n",
name, errno, strerror(errno));
} else {
fprintf(stderr, "open(\"%s\") succeeded\n", name);
close(fd);
}
error = fstatat(AT_FDCWD, name, &st, AT_RESOLVE_BENEATH);
if (error == -1){
fprintf(stderr, "stat(\"%s\") failed, error %d %s\n",
name, errno, strerror(errno));
} else {
fprintf(stderr, "stat(\"%s\") succeeded\n", name);
}
}
}
EOF
cc -o $top/beneath -Wall -Wextra $top/beneath.c || exit 1
rm $top/beneath.c
# Test with two directories as arguments:
cd $top
mkdir -p a/b
./beneath a/b
./beneath $top/a/b
touch $top/a/c
./beneath a/c
./beneath $top/a/c
./beneath a/d
./beneath $top/a/d
# CWD is still $top for this test
top2=/var/tmp/beneath.d
mkdir -p $top2
mkdir -p $top2/a/b
./beneath $top2/a/b > /dev/null 2>&1
touch $top2/a/c
./beneath $top2/a/c > /dev/null 2>&1
# Other CWDs
(cd /etc; find . | head -1000 | xargs $top/beneath) > /dev/null 2>&1
(cd /var; find . | head -1000 | xargs $top/beneath) > /dev/null 2>&1
rm -rf $top $top2
exit 0
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