164 lines
4.2 KiB
C
164 lines
4.2 KiB
C
/*
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* Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
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* The President and Fellows of Harvard College.
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY 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 UNIVERSITY 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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/*
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* rmtest.c
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*
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* Tests file system synchronization by deleting an open file and
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* then attempting to read it.
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*
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* This should run correctly when the file system assignment is complete.
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*/
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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 <unistd.h>
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#include <errno.h>
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#include <err.h>
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#define TEST "rmdata"
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#define TESTDATA "I wish I was a headlight. -- Jerry Garcia"
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#define TESTLEN (sizeof(TESTDATA)-1)
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static
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void
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dorm(int fd)
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{
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/*
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* This used to spawn a copy of /bin/rm, but that's silly.
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* However, we will do the remove() from a subprocess, so
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* that various kinds of improper hacks to make this test
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* run won't work.
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*
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* Close the file in the subprocess, for similar reasons.
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*/
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pid_t pid;
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int status;
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pid = fork();
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if (pid<0) {
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err(1, "fork");
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}
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if (pid==0) {
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/* child process */
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close(fd);
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if (remove(TEST)) {
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err(1, "%s: remove", TEST);
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}
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_exit(0);
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}
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/* parent process */
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if (waitpid(pid, &status, 0)<0) {
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err(1, "waitpid");
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}
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else if (WIFSIGNALED(status)) {
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warn("child process exited with signal %d", WTERMSIG(status));
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}
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else if (WEXITSTATUS(status) != 0) {
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warnx("child process exited with code %d",WEXITSTATUS(status));
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}
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}
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static
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int
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same(const char *a, const char *b, int len)
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{
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while (len-- > 0) {
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if (*a++ != *b++) return 0;
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}
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return 1;
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}
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int
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main(void)
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{
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int file, len;
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char buf[TESTLEN];
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/* create test data file */
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file = open(TEST, O_WRONLY | O_CREAT | O_TRUNC, 0664);
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write(file, TESTDATA, TESTLEN);
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close(file);
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/* make sure the data is there */
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file = open(TEST, O_RDONLY);
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len = read(file, buf, TESTLEN);
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if (len < 0) {
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warn("read: before deletion");
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}
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else if (len < (int)TESTLEN) {
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warnx("read: before deletion: short count %d", len);
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}
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if (!same(buf, TESTDATA, TESTLEN)) {
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errx(1, "Failed: data read back was not the same");
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}
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/* rewind the file */
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if (lseek(file, 0, SEEK_SET)) {
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err(1, "lseek");
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}
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/* now spawn our killer and wait for it to do its work */
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dorm(file);
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/* we should be still able to read the data */
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memset(buf, '\0', TESTLEN);
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len = read(file, buf, TESTLEN);
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if (len < 0) {
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warn("read: after deletion");
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}
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else if (len < (int)TESTLEN) {
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warnx("read: after deletion: short count %d", len);
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}
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if (!same(buf, TESTDATA, TESTLEN)) {
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errx(1, "Failed: data read after deletion was not the same");
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}
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/* ok, close the file and it should go away */
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close(file);
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/* try to open it again */
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file = open(TEST, O_RDONLY);
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if (file >= 0) {
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close(file);
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errx(1, "Failed: the file could still be opened");
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}
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if (errno!=ENOENT) {
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err(1, "Unexpected error reopening the file");
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}
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tprintf("Succeeded!\n");
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return 0;
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}
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