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DEFINITIONS
This source file includes following definitions.
- check_buffer
- subproc_read
1 /*
2 * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
3 * The President and Fellows of Harvard College.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 /*
31 * f_read.c
32 *
33 * This used to be a separate binary, because it came from Nachos
34 * and nachos didn't support fork(). However, in OS/161 there's
35 * no reason to make it a separate binary; doing so just makes
36 * the test flaky.
37 *
38 *
39 * it will start reading from a given file, concurrently
40 * with other instances of f_read and f_write.
41 *
42 */
43
44 #define SectorSize 512
45
46 #define TMULT 50
47 #define FSIZE ((SectorSize + 1) * TMULT)
48
49 #define FNAME "f-testfile"
50 #define READCHAR 'r'
51 #define WRITECHAR 'w'
52
53 #include <stdio.h>
54 #include <unistd.h>
55 #include <err.h>
56 #include "f_hdr.h"
57
58 static char buffer[SectorSize + 1];
59
60 static
61 void
62 check_buffer(void)
63 {
64 int i;
65 char ch = buffer[0];
66
67 for (i = 1; i < SectorSize + 1; i++) {
68 if (buffer[i] != ch) {
69 errx(1, "Read error: %s", buffer);
70 }
71 }
72
73 putchar(ch);
74 }
75
76 void
77 subproc_read(void)
78 {
79 int fd;
80 int i, res;
81
82 printf("File Reader starting ...\n\n");
83
84 fd = open(FNAME, O_RDONLY);
85 if (fd < 0) {
86 err(1, "%s: open", FNAME);
87 }
88
89 for (i=0; i<TMULT; i++) {
90 res = read(fd, buffer, SectorSize + 1);
91 if (res < 0) {
92 err(1, "%s: read", FNAME);
93 }
94
95 // yield();
96
97 if (res != SectorSize + 1) {
98 errx(1, "%s: read: short count", FNAME);
99 }
100 check_buffer();
101 }
102
103 close(fd);
104
105 printf("File Read exited successfully!\n");
106 }