/* * 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. */ /* * f_read.c * * This used to be a separate binary, because it came from Nachos * and nachos didn't support fork(). However, in OS/161 there's * no reason to make it a separate binary; doing so just makes * the test flaky. * * * it will start reading from a given file, concurrently * with other instances of f_read and f_write. * */ #define SectorSize 512 #define TMULT 50 #define FSIZE ((SectorSize + 1) * TMULT) #define FNAME "f-testfile" #define READCHAR 'r' #define WRITECHAR 'w' #include <stdio.h> #include <unistd.h> #include <err.h> #include "f_hdr.h" static char buffer[SectorSize + 1]; static void check_buffer(void) { int i; char ch = buffer[0]; for (i = 1; i < SectorSize + 1; i++) { if (buffer[i] != ch) { errx(1, "Read error: %s", buffer); } } putchar(ch); } void subproc_read(void) { int fd; int i, res; printf("File Reader starting ...\n\n"); fd = open(FNAME, O_RDONLY); if (fd < 0) { err(1, "%s: open", FNAME); } for (i=0; i<TMULT; i++) { res = read(fd, buffer, SectorSize + 1); if (res < 0) { err(1, "%s: read", FNAME); } // yield(); if (res != SectorSize + 1) { errx(1, "%s: read: short count", FNAME); } check_buffer(); } close(fd); printf("File Read exited successfully!\n"); }