filetest.c

/*
 * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
 *      The President and Fellows of Harvard College.
 *
 * 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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY 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 UNIVERSITY 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.
 */

/*
 * filetest.c
 *
 *      Tests the filesystem by opening, writing to and reading from a 
 *      user specified file.
 *
 * This should run (on SFS) even before the file system assignment is started.
 * It should also continue to work once said assignment is complete.
 * It will not run fully on emufs, because emufs does not support remove().
 */

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <err.h>

int
main(int argc, char *argv[])
{
        static char writebuf[40] = "Twiddle dee dee, Twiddle dum dum.......\n";
        static char readbuf[41];

        int fd, rv;

        if (argc!=2) {
                errx(1, "Usage: filetest <filename>");
        }

        fd = open(argv[1], O_WRONLY|O_CREAT|O_TRUNC, 0664);
        if (fd<0) {
                err(1, "%s: open for write", argv[1]);
        }


        rv = write(fd, writebuf, 40);
        if (rv<0) {
                err(1, "%s: write", argv[1]);
        }

        rv = close(fd);
        if (rv<0) {
                err(1, "%s: close (1st time)", argv[1]);
        }

        fd = open(argv[1], O_RDONLY);
        if (fd<0) { 
                err(1, "%s: open for read", argv[1]);
        }

        rv = read(fd, readbuf, 40);
        if (rv<0) {
                err(1, "%s: read", argv[1]);
        }
        rv = close(fd);
        if (rv<0) {
                err(1, "%s: close (2nd time)", argv[1]);
        }
        /* ensure null termination */
        readbuf[40] = 0;

        if (strcmp(readbuf, writebuf)) {
                errx(1, "Buffer data mismatch!");
        }

        rv = remove(argv[1]);
        if (rv<0) {
                err(1, "%s: remove", argv[1]);
        }
        printf("Passed filetest.\n");
        return 0;
}