107 lines
2.9 KiB
C
107 lines
2.9 KiB
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.
|
|
*/
|
|
|
|
/*
|
|
* 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;
|
|
|
|
tprintf("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);
|
|
|
|
tprintf("File Read exited successfully!\n");
|
|
}
|