1 /* $OpenBSD: t_pipe.c,v 1.2 2020/11/09 23:18:51 bluhm Exp $ */ 2 /* $NetBSD: t_pipe.c,v 1.7 2020/06/26 07:50:11 jruoho Exp $ */ 3 4 /*- 5 * Copyright (c) 2001, 2008 The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include "macros.h" 31 32 #include <sys/cdefs.h> 33 #include <sys/cdefs.h> 34 __COPYRIGHT("@(#) Copyright (c) 2008\ 35 The NetBSD Foundation, inc. All rights reserved."); 36 __RCSID("$NetBSD: t_pipe.c,v 1.7 2020/06/26 07:50:11 jruoho Exp $"); 37 38 #include <sys/types.h> 39 #include <sys/wait.h> 40 41 #include <errno.h> 42 #include <fcntl.h> 43 #include <poll.h> 44 #include <sched.h> 45 #include <signal.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <unistd.h> 49 50 #include "atf-c.h" 51 52 #include "h_macros.h" 53 54 static pid_t pid; 55 static int nsiginfo = 0; 56 57 /* 58 * This is used for both parent and child. Handle parent's SIGALRM, 59 * the childs SIGINFO doesn't need anything. 60 */ 61 static void 62 sighand(int sig) 63 { 64 if (sig == SIGALRM) { 65 kill(pid, SIGINFO); 66 } 67 if (sig == SIGINFO) { 68 nsiginfo++; 69 } 70 } 71 72 ATF_TC(pipe_restart); 73 ATF_TC_HEAD(pipe_restart, tc) 74 { 75 atf_tc_set_md_var(tc, "descr", "Checks that writing to pipe " 76 "works correctly after being interrupted and restarted " 77 "(PR kern/14087)"); 78 } 79 80 ATF_TC_BODY(pipe_restart, tc) 81 { 82 int pp[2], st; 83 ssize_t sz, todo, done; 84 char *f; 85 sigset_t asigset, osigset, emptysigset; 86 87 /* Initialise signal masks */ 88 RL(sigemptyset(&emptysigset)); 89 RL(sigemptyset(&asigset)); 90 RL(sigaddset(&asigset, SIGINFO)); 91 92 /* Register signal handlers for both read and writer */ 93 REQUIRE_LIBC(signal(SIGINFO, sighand), SIG_ERR); 94 REQUIRE_LIBC(signal(SIGALRM, sighand), SIG_ERR); 95 96 todo = 2 * 1024 * 1024; 97 REQUIRE_LIBC(f = malloc(todo), NULL); 98 99 RL(pipe(pp)); 100 101 RL(pid = fork()); 102 if (pid == 0) { 103 /* child */ 104 RL(close(pp[1])); 105 106 /* Do initial write. This should succeed, make 107 * the other side do partial write and wait for us to pick 108 * rest up. 109 */ 110 RL(done = read(pp[0], f, 128 * 1024)); 111 112 /* Wait until parent is alarmed and awakens us */ 113 RL(sigprocmask(SIG_BLOCK, &asigset, &osigset)); 114 while (nsiginfo == 0) { 115 if (sigsuspend(&emptysigset) != -1 || errno != EINTR) 116 atf_tc_fail("sigsuspend(&emptysigset): %s", 117 strerror(errno)); 118 } 119 RL(sigprocmask(SIG_SETMASK, &osigset, NULL)); 120 121 /* Read all what parent wants to give us */ 122 while((sz = read(pp[0], f, 1024 * 1024)) > 0) 123 done += sz; 124 125 /* 126 * Exit with 1 if number of bytes read doesn't match 127 * number of expected bytes 128 */ 129 printf("Read: %#zx\n", (size_t)done); 130 printf("Expected: %#zx\n", (size_t)todo); 131 132 exit(done != todo); 133 134 /* NOTREACHED */ 135 } else { 136 RL(close(pp[0])); 137 138 /* 139 * Arrange for alarm after two seconds. Since we have 140 * handler setup for SIGARLM, the write(2) call should 141 * be restarted internally by kernel. 142 */ 143 (void)alarm(2); 144 145 /* We write exactly 'todo' bytes. The very first write(2) 146 * should partially succeed, block and eventually 147 * be restarted by kernel 148 */ 149 while(todo > 0 && ((sz = write(pp[1], f, todo)) > 0)) 150 todo -= sz; 151 152 /* Close the pipe, so that child would stop reading */ 153 RL(close(pp[1])); 154 155 /* And pickup child's exit status */ 156 RL(waitpid(pid, &st, 0)); 157 158 ATF_REQUIRE_EQ(WEXITSTATUS(st), 0); 159 } 160 free(f); 161 } 162 163 ATF_TP_ADD_TCS(tp) 164 { 165 ATF_TP_ADD_TC(tp, pipe_restart); 166 167 return atf_no_error(); 168 } 169