/* * 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. */ /* * rmtest.c * * Tests file system synchronization by deleting an open file and * then attempting to read it. * * This should run correctly when the file system assignment is complete. */ #include #include #include #include #include // 23 Mar 2012 : GWA : BUFFER_COUNT must be even. #define BUFFER_COUNT 128 #define BUFFER_SIZE 128 static int writebuf[BUFFER_SIZE]; static int readbuf[BUFFER_SIZE]; int main(int argc, char **argv) { // 23 Mar 2012 : GWA : Assume argument passing is *not* supported. (void) argc; (void) argv; int i, j; int fh, len; off_t pos, target; const char * filename = "fileonlytest.dat"; // 23 Mar 2012 : GWA : Test that open works. tprintf("Opening %s\n", filename); fh = open(filename, O_RDWR|O_CREAT|O_TRUNC); if (fh < 0) { err(1, "create failed"); } tprintf("Writing %d bytes.\n", BUFFER_SIZE * BUFFER_COUNT); // 23 Mar 2012 : GWA : Do the even-numbered writes. Test read() and // lseek(SEEK_END). for (i = 0; i < BUFFER_COUNT / 2; i++) { for (j = 0; j < BUFFER_SIZE; j++) { writebuf[j] = i * 2 * j; } len = write(fh, writebuf, sizeof(writebuf)); if (len != sizeof(writebuf)) { err(1, "write failed"); } // 23 Mar 2012 : GWA : Use lseek() to skip the odd guys. target = (i + 1) * 2 * sizeof(writebuf); pos = lseek(fh, sizeof(writebuf), SEEK_END); if (pos != target) { err(1, "(even) lseek failed: %llu != %llu", pos, target); } } target = 0; pos = lseek(fh, target, SEEK_SET); if (pos != target) { err(1, "(reset) lseek failed: %llu != %llu", pos, target); } // 23 Mar 2012 : GWA : Do the odd-numbered writes. Test write() and // lseek(SEEK_CUR). for (i = 0; i < BUFFER_COUNT / 2; i++) { // 23 Mar 2012 : GWA : Use lseek() to skip the even guys. target = ((i * 2) + 1) * sizeof(writebuf); pos = lseek(fh, sizeof(writebuf), SEEK_CUR); if (pos != target) { err(1, "(odd) lseek failed: %llu != %llu", pos, target); } for (j = 0; j < BUFFER_SIZE; j++) { writebuf[j] = ((i * 2) + 1) * j; } len = write(fh, writebuf, sizeof(writebuf)); if (len != sizeof(writebuf)) { err(1, "write failed"); } } // 23 Mar 2012 : GWA : Read the test data back and make sure what we wrote // ended up where we wrote it. Tests read() and lseek(SEEK_SET). tprintf("Verifying write.\n"); for (i = BUFFER_COUNT - 1; i >= 0; i--) { target = i * sizeof(writebuf); pos = lseek(fh, target, SEEK_SET); if (pos != target) { err(1, "(verify) lseek failed: %llu != %llu", pos, target); } len = read(fh, readbuf, sizeof(readbuf)); if (len != sizeof(readbuf)) { err(1, "read failed"); } for (j = BUFFER_SIZE - 1; j >= 0; j--) { if (readbuf[j] != i * j) { err(1, "read mismatch: pos=%llu, readbuf[j]=%d, i*j=%d, i=%d, j=%d", pos, readbuf[j], i * j, i, j); } } } // 23 Mar 2012 : GWA : Close the file. tprintf("Closing %s\n", filename); close(fh); // 23 Mar 2012 : GWA : Make sure the file is actually closed. pos = lseek(fh, (off_t) 0, SEEK_SET); if (pos == 0) { err(1, "seek after close succeeded"); } // 23 Mar 2012 : GWA : FIXME : Spin until exit() works. tprintf("Spinning in case exit() doesn't work.\n"); while (1) {}; return 0; }