1272343Sngie/* $NetBSD: t_pipe.c,v 1.3 2011/10/31 15:41:31 christos Exp $ */ 2272343Sngie 3272343Sngie/*- 4272343Sngie * Copyright (c) 2001, 2008 The NetBSD Foundation, Inc. 5272343Sngie * All rights reserved. 6272343Sngie * 7272343Sngie * Redistribution and use in source and binary forms, with or without 8272343Sngie * modification, are permitted provided that the following conditions 9272343Sngie * are met: 10272343Sngie * 1. Redistributions of source code must retain the above copyright 11272343Sngie * notice, this list of conditions and the following disclaimer. 12272343Sngie * 2. Redistributions in binary form must reproduce the above copyright 13272343Sngie * notice, this list of conditions and the following disclaimer in the 14272343Sngie * documentation and/or other materials provided with the distribution. 15272343Sngie * 16272343Sngie * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17272343Sngie * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18272343Sngie * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19272343Sngie * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20272343Sngie * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21272343Sngie * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22272343Sngie * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23272343Sngie * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24272343Sngie * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25272343Sngie * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26272343Sngie * POSSIBILITY OF SUCH DAMAGE. 27272343Sngie */ 28272343Sngie 29272343Sngie#include <sys/cdefs.h> 30272343Sngie__COPYRIGHT("@(#) Copyright (c) 2008\ 31272343Sngie The NetBSD Foundation, inc. All rights reserved."); 32272343Sngie__RCSID("$NetBSD: t_pipe.c,v 1.3 2011/10/31 15:41:31 christos Exp $"); 33272343Sngie 34272343Sngie#include <sys/types.h> 35272343Sngie#include <sys/wait.h> 36272343Sngie 37272343Sngie#include <errno.h> 38272343Sngie#include <fcntl.h> 39272343Sngie#include <poll.h> 40272343Sngie#include <sched.h> 41272343Sngie#include <signal.h> 42272343Sngie#include <stdio.h> 43272343Sngie#include <stdlib.h> 44272343Sngie#include <unistd.h> 45272343Sngie 46272343Sngie#include <atf-c.h> 47272343Sngie 48272343Sngie#include "../../../h_macros.h" 49272343Sngie 50272343Sngiestatic pid_t pid; 51272343Sngiestatic int nsiginfo = 0; 52272343Sngie 53272343Sngie/* 54272343Sngie * This is used for both parent and child. Handle parent's SIGALRM, 55272343Sngie * the childs SIGINFO doesn't need anything. 56272343Sngie */ 57272343Sngiestatic void 58272343Sngiesighand(int sig) 59272343Sngie{ 60272343Sngie if (sig == SIGALRM) { 61272343Sngie kill(pid, SIGINFO); 62272343Sngie } 63272343Sngie if (sig == SIGINFO) { 64272343Sngie nsiginfo++; 65272343Sngie } 66272343Sngie} 67272343Sngie 68272343SngieATF_TC(pipe_restart); 69272343SngieATF_TC_HEAD(pipe_restart, tc) 70272343Sngie{ 71272343Sngie atf_tc_set_md_var(tc, "descr", "Checks that writing to pipe " 72272343Sngie "works correctly after being interrupted and restarted " 73272343Sngie "(kern/14087)"); 74272343Sngie} 75272343Sngie 76272343SngieATF_TC_BODY(pipe_restart, tc) 77272343Sngie{ 78272343Sngie int pp[2], st; 79272343Sngie ssize_t sz, todo, done; 80272343Sngie char *f; 81272343Sngie sigset_t asigset, osigset, emptysigset; 82272343Sngie 83272343Sngie /* Initialise signal masks */ 84272343Sngie RL(sigemptyset(&emptysigset)); 85272343Sngie RL(sigemptyset(&asigset)); 86272343Sngie RL(sigaddset(&asigset, SIGINFO)); 87272343Sngie 88272343Sngie /* Register signal handlers for both read and writer */ 89272343Sngie REQUIRE_LIBC(signal(SIGINFO, sighand), SIG_ERR); 90272343Sngie REQUIRE_LIBC(signal(SIGALRM, sighand), SIG_ERR); 91272343Sngie 92272343Sngie todo = 2 * 1024 * 1024; 93272343Sngie REQUIRE_LIBC(f = malloc(todo), NULL); 94272343Sngie 95272343Sngie RL(pipe(pp)); 96272343Sngie 97272343Sngie RL(pid = fork()); 98272343Sngie if (pid == 0) { 99272343Sngie /* child */ 100272343Sngie RL(close(pp[1])); 101272343Sngie 102272343Sngie /* Do inital write. This should succeed, make 103272343Sngie * the other side do partial write and wait for us to pick 104272343Sngie * rest up. 105272343Sngie */ 106272343Sngie RL(done = read(pp[0], f, 128 * 1024)); 107272343Sngie 108272343Sngie /* Wait until parent is alarmed and awakens us */ 109272343Sngie RL(sigprocmask(SIG_BLOCK, &asigset, &osigset)); 110272343Sngie while (nsiginfo == 0) { 111272343Sngie if (sigsuspend(&emptysigset) != -1 || errno != EINTR) 112272343Sngie atf_tc_fail("sigsuspend(&emptysigset): %s", 113272343Sngie strerror(errno)); 114272343Sngie } 115272343Sngie RL(sigprocmask(SIG_SETMASK, &osigset, NULL)); 116272343Sngie 117272343Sngie /* Read all what parent wants to give us */ 118272343Sngie while((sz = read(pp[0], f, 1024 * 1024)) > 0) 119272343Sngie done += sz; 120272343Sngie 121272343Sngie /* 122272343Sngie * Exit with 1 if number of bytes read doesn't match 123272343Sngie * number of expected bytes 124272343Sngie */ 125272343Sngie printf("Read: %#zx\n", (size_t)done); 126272343Sngie printf("Expected: %#zx\n", (size_t)todo); 127272343Sngie 128272343Sngie exit(done != todo); 129272343Sngie 130272343Sngie /* NOTREACHED */ 131272343Sngie } else { 132272343Sngie RL(close(pp[0])); 133272343Sngie 134272343Sngie /* 135272343Sngie * Arrange for alarm after two seconds. Since we have 136272343Sngie * handler setup for SIGARLM, the write(2) call should 137272343Sngie * be restarted internally by kernel. 138272343Sngie */ 139272343Sngie (void)alarm(2); 140272343Sngie 141272343Sngie /* We write exactly 'todo' bytes. The very first write(2) 142272343Sngie * should partially succeed, block and eventually 143272343Sngie * be restarted by kernel 144272343Sngie */ 145272343Sngie while(todo > 0 && ((sz = write(pp[1], f, todo)) > 0)) 146272343Sngie todo -= sz; 147272343Sngie 148272343Sngie /* Close the pipe, so that child would stop reading */ 149272343Sngie RL(close(pp[1])); 150272343Sngie 151272343Sngie /* And pickup child's exit status */ 152272343Sngie RL(waitpid(pid, &st, 0)); 153272343Sngie 154272343Sngie ATF_REQUIRE_EQ(WEXITSTATUS(st), 0); 155272343Sngie } 156272343Sngie} 157272343Sngie 158272343SngieATF_TP_ADD_TCS(tp) 159272343Sngie{ 160272343Sngie ATF_TP_ADD_TC(tp, pipe_restart); 161272343Sngie 162272343Sngie return atf_no_error(); 163272343Sngie} 164