1#!/bin/sh 2 3# 4# Copyright (c) 2009 Peter Holm <pho@FreeBSD.org> 5# All rights reserved. 6# 7# Redistribution and use in source and binary forms, with or without 8# modification, are permitted provided that the following conditions 9# are met: 10# 1. Redistributions of source code must retain the above copyright 11# notice, this list of conditions and the following disclaimer. 12# 2. Redistributions in binary form must reproduce the above copyright 13# notice, this list of conditions and the following disclaimer in the 14# documentation and/or other materials provided with the distribution. 15# 16# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26# SUCH DAMAGE. 27# 28# $FreeBSD$ 29# 30 31# Test race between ISDOTDOT lookups and directory removal/rename 32 33# With lookup_shared=1 rename() will fail from time to time with ENOENT and 34# the following stat() will succed. 35 36# Test scenario by tegge 37 38here=`pwd` 39cd /tmp 40sed '1,/^EOF/d' < $here/$0 > rename.c 41cc -o rename -Wall rename.c 42rm -f rename.c 43cd $here 44 45rm -rf /tmp/rename.dir.* 46for i in `jot 10`; do 47 for j in `jot 10`; do 48 /tmp/rename & 49 done 50 for j in `jot 10`; do 51 wait 52 done 53done 54rm -rf /tmp/rename.dir.* 55exit 0 56EOF 57#include <err.h> 58#include <fcntl.h> 59#include <libgen.h> 60#include <stdio.h> 61#include <stdlib.h> 62#include <string.h> 63#include <sys/stat.h> 64#include <sys/types.h> 65#include <sys/wait.h> 66#include <unistd.h> 67 68static char dir1[128]; 69static char dir2[128]; 70 71int 72main(int argc, char **argv) 73{ 74 int i, status; 75 struct stat sb; 76 pid_t p; 77 78 sprintf(dir1, "/tmp/rename.dir.%d", getpid()); 79 sprintf(dir2, "/tmp/rename.dir.2.%d", getpid()); 80 if (mkdir(dir1, 0700) == -1) 81 err(1, "mkdir(%s)", dir1); 82 83 if (chdir(dir1) == -1) 84 err(1, "chdir(%s)", dir1); 85 if ((p = fork()) == -1) 86 err(1, "fork()"); 87 if (p == 0) { 88 if (chdir("..") == -1) 89 err(1, "chdir(%s)", ".."); 90 for (i = 0; i < 100000; i++) { 91 if (rename(dir1, dir2) == -1) { 92 warn("rename(%s, %s)", dir1, dir2); 93 stat(dir1, &sb); 94 if (stat(dir1, &sb) == -1) 95 err(1, "stat(%s)", dir1); 96 else 97 errx(1, "stat(%s) succeeded!", dir1); 98 } 99 if (rename(dir2, dir1) == -1) { 100 warn("rename(%s, %s)", dir2, dir1); 101 stat(dir2, &sb); 102 if (stat(dir2, &sb) == -1) 103 err(1, "stat(%s)", dir2); 104 else 105 errx(1, "stat(%s) succeeded!", dir2); 106 } 107 } 108 exit(0); 109 } else { 110 for (i = 0; i < 100000; i++) { 111 if (stat("..", &sb) == -1) 112 err(1, "stat(..)"); 113 } 114 } 115 if (waitpid(p, &status, 0) == -1) 116 err(1, "waitpid()"); 117 if (rmdir(dir1) == -1) 118 err(1, "rmdir(%s)", dir1); 119 120 return (0); 121} 122