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