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161 lines
3.9 KiB
Bash
Executable File
161 lines
3.9 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (c) 2012 Peter Holm <pho@FreeBSD.org>
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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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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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# Problem seen with atomic assignment of f_offset. Fixed in r238029.
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# Test scenario by kib@
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. ../default.cfg
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here=`pwd`
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cd /tmp
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sed '1,/^EOF/d' < $here/$0 > f_offset.c
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mycc -o f_offset -Wall -Wextra -O2 f_offset.c -lpthread
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rm -f f_offset.c
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/tmp/f_offset
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rm -f /tmp/f_offset
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exit 0
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EOF
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/*
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Description by kib:
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To really exercise the race conditions, all the following items must
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be fulfilled simultaneously:
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1. you use 32bit host, i.e. i386
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2. you operate on the file offsets larger than 4GB (but see below)
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3. there are several threads or processes that operate on the same
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file descriptor simultaneously.
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Please note that the normal fork(2) causes file descriptor table
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copy, so only rfork(2) call with RFFDG flag unset causes sharing. Or,
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multi-threading can be used.
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*/
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#include <err.h>
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#include <fcntl.h>
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#include <pthread.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 <sys/types.h>
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#include <unistd.h>
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int errors, fd;
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char file[128];
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#define START 0x100000000ULL
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#define N 1000000
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void *
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t1(void *arg __unused)
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{
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int i;
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off_t offset;
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offset = START + 2;
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for (i = 0; i < N; i++) {
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if (lseek(fd, offset, SEEK_SET) == -1)
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err(1, "lseek error");
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}
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return (0);
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}
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void *
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t2(void *arg __unused)
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{
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int i;
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off_t offset;
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offset = 1;
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for (i = 0; i < N; i++) {
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if (lseek(fd, offset, SEEK_SET) == -1)
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err(1, "lseek error");
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}
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return (0);
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}
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void *
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t3(void *arg __unused)
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{
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int i;
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off_t offset;
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offset = 1;
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for (i = 0; i < N; i++) {
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if ((offset = lseek(fd, 0, SEEK_CUR)) == -1)
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err(1, "lseek error");
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if (offset != 1 && offset != START + 2)
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fprintf(stderr, "FAIL #%d offset = %10jd (0x%09jx)\n",
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errors++, offset, offset);
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}
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return (0);
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}
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int
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main(void)
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{
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pthread_t threads[3];
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int r;
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int i;
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off_t offset;
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snprintf(file, sizeof(file), "file.%06d", getpid());
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if ((fd = open(file, O_RDWR | O_CREAT | O_TRUNC, 0600)) < 0)
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err(1, "%s", file);
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offset = 1;
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if (lseek(fd, offset, SEEK_SET) == -1)
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err(1, "lseek error");
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for (i = 0; i < 20 && errors < 10; i++) {
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if ((r = pthread_create(&threads[0], NULL, t1, 0)) != 0)
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errc(1, r, "pthread_create()");
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if ((r = pthread_create(&threads[1], NULL, t2, 0)) != 0)
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errc(1, r, "pthread_create()");
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if ((r = pthread_create(&threads[2], NULL, t3, 0)) != 0)
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errc(1, r, "pthread_create()");
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if ((r = pthread_join(threads[0], NULL)) != 0)
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errc(1, r, "pthread_join(%d)", 0);
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if ((r = pthread_join(threads[1], NULL)) != 0)
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errc(1, r, "pthread_join(%d)", 1);
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if ((r = pthread_join(threads[2], NULL)) != 0)
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errc(1, r, "pthread_join(%d)", 2);
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}
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close(fd);
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if (unlink(file) == -1)
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err(3, "unlink(%s)", file);
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return (0);
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}
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