1/*	$NetBSD: test_readhappy.c,v 1.1 2018/04/20 00:06:45 kamil Exp $	*/
2
3/*
4 * Copyright (c) 2018 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <err.h>
30#include <errno.h>
31#include <pthread.h>
32#include <stdio.h>
33#include <stdlib.h>
34
35/*
36 * Compile this program with -pthread and run it to test the readhappy_mpsafe
37 * module. This program should print out happy numbers read from /dev/happy_mpsafe.
38 * Insert the module and make the /dev/happy_mpsafe node before executing this file.
39 */
40
41
42static void* read_happy(void *);
43
44static FILE *fp;
45
46/*
47 * thread function used to read /dev/happy_mpsafe and print them out.
48 */
49static void *
50read_happy(void *unused)
51{
52	int line;
53
54	for (;;) {
55		fscanf(fp, "%d", &line);
56		printf("%d\n", line);
57		fflush(stdout);
58	}
59	/* NOTREACHED */
60	return NULL;
61}
62
63/*
64 *  main function : opens /dev/happy_mpsafe and sets the global file descriptor
65 *  creates 100 threads which try to use the file descriptor to read
66 *  from /dev/happy_mpsafe.
67 *  This function does not return anything and will run in an infinite loop.
68 */
69int
70main(int argc, const char *argv[])
71{
72	pthread_t thr[100];
73
74	fp = fopen("/dev/happy_mpsafe","r");
75	if (fp == NULL)
76		err(EXIT_FAILURE, "open");
77	for (int i = 0; i < 100; i++)
78		pthread_create(&thr[i], NULL, read_happy, NULL);
79	(void)read_happy(NULL);
80	/* NOTREACHED */
81	return EXIT_SUCCESS;
82}
83