t_pipe.c revision 1.1
1/* $NetBSD: t_pipe.c,v 1.1 2011/10/15 06:17:02 jruoho Exp $ */ 2 3/*- 4 * Copyright (c) 2001, 2008 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 <sys/cdefs.h> 30__COPYRIGHT("@(#) Copyright (c) 2008\ 31 The NetBSD Foundation, inc. All rights reserved."); 32__RCSID("$NetBSD: t_pipe.c,v 1.1 2011/10/15 06:17:02 jruoho Exp $"); 33 34#include <sys/types.h> 35#include <sys/wait.h> 36 37#include <errno.h> 38#include <poll.h> 39#include <sched.h> 40#include <signal.h> 41#include <stdio.h> 42#include <stdlib.h> 43#include <unistd.h> 44 45#include <atf-c.h> 46 47#include "../../../h_macros.h" 48 49static pid_t pid; 50static int nsiginfo = 0; 51 52/* 53 * This is used for both parent and child. Handle parent's SIGALRM, 54 * the childs SIGINFO doesn't need anything. 55 */ 56static void 57sighand(int sig) 58{ 59 if (sig == SIGALRM) { 60 kill(pid, SIGINFO); 61 } 62 if (sig == SIGINFO) { 63 nsiginfo++; 64 } 65} 66 67ATF_TC(pipe_restart); 68ATF_TC_HEAD(pipe_restart, tc) 69{ 70 atf_tc_set_md_var(tc, "descr", "Checks that writing to pipe " 71 "works correctly after being interrupted and restarted " 72 "(kern/14087)"); 73} 74 75ATF_TC_BODY(pipe_restart, tc) 76{ 77 int pp[2], st; 78 ssize_t sz, todo, done; 79 char *f; 80 sigset_t asigset, osigset, emptysigset; 81 82 /* Initialise signal masks */ 83 RL(sigemptyset(&emptysigset)); 84 RL(sigemptyset(&asigset)); 85 RL(sigaddset(&asigset, SIGINFO)); 86 87 /* Register signal handlers for both read and writer */ 88 REQUIRE_LIBC(signal(SIGINFO, sighand), SIG_ERR); 89 REQUIRE_LIBC(signal(SIGALRM, sighand), SIG_ERR); 90 91 todo = 2 * 1024 * 1024; 92 REQUIRE_LIBC(f = malloc(todo), NULL); 93 94 RL(pipe(pp)); 95 96 RL(pid = fork()); 97 if (pid == 0) { 98 /* child */ 99 RL(close(pp[1])); 100 101 /* Do inital write. This should succeed, make 102 * the other side do partial write and wait for us to pick 103 * rest up. 104 */ 105 RL(done = read(pp[0], f, 128 * 1024)); 106 107 /* Wait until parent is alarmed and awakens us */ 108 RL(sigprocmask(SIG_BLOCK, &asigset, &osigset)); 109 while (nsiginfo == 0) { 110 if (sigsuspend(&emptysigset) != -1 || errno != EINTR) 111 atf_tc_fail("sigsuspend(&emptysigset): %s", 112 strerror(errno)); 113 } 114 RL(sigprocmask(SIG_SETMASK, &osigset, NULL)); 115 116 /* Read all what parent wants to give us */ 117 while((sz = read(pp[0], f, 1024 * 1024)) > 0) 118 done += sz; 119 120 /* 121 * Exit with 1 if number of bytes read doesn't match 122 * number of expected bytes 123 */ 124 printf("Read: %#zx\n", (size_t)done); 125 printf("Expected: %#zx\n", (size_t)todo); 126 127 exit(done != todo); 128 129 /* NOTREACHED */ 130 } else { 131 RL(close(pp[0])); 132 133 /* 134 * Arrange for alarm after two seconds. Since we have 135 * handler setup for SIGARLM, the write(2) call should 136 * be restarted internally by kernel. 137 */ 138 (void)alarm(2); 139 140 /* We write exactly 'todo' bytes. The very first write(2) 141 * should partially succeed, block and eventually 142 * be restarted by kernel 143 */ 144 while(todo > 0 && ((sz = write(pp[1], f, todo)) > 0)) 145 todo -= sz; 146 147 /* Close the pipe, so that child would stop reading */ 148 RL(close(pp[1])); 149 150 /* And pickup child's exit status */ 151 RL(waitpid(pid, &st, 0)); 152 153 ATF_REQUIRE_EQ(WEXITSTATUS(st), 0); 154 } 155} 156 157ATF_TP_ADD_TCS(tp) 158{ 159 ATF_TP_ADD_TC(tp, pipe_restart); 160 161 return atf_no_error(); 162} 163