1 /* $OpenBSD: t_pipe.c,v 1.3 2021/12/13 16:56:48 deraadt 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/types.h> 33 #include <sys/wait.h> 34 35 #include <errno.h> 36 #include <fcntl.h> 37 #include <poll.h> 38 #include <sched.h> 39 #include <signal.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <unistd.h> 43 44 #include "atf-c.h" 45 46 #include "h_macros.h" 47 48 static pid_t pid; 49 static int nsiginfo = 0; 50 51 /* 52 * This is used for both parent and child. Handle parent's SIGALRM, 53 * the childs SIGINFO doesn't need anything. 54 */ 55 static void 56 sighand(int sig) 57 { 58 if (sig == SIGALRM) { 59 kill(pid, SIGINFO); 60 } 61 if (sig == SIGINFO) { 62 nsiginfo++; 63 } 64 } 65 66 ATF_TC(pipe_restart); 67 ATF_TC_HEAD(pipe_restart, tc) 68 { 69 atf_tc_set_md_var(tc, "descr", "Checks that writing to pipe " 70 "works correctly after being interrupted and restarted " 71 "(PR kern/14087)"); 72 } 73 74 ATF_TC_BODY(pipe_restart, tc) 75 { 76 int pp[2], st; 77 ssize_t sz, todo, done; 78 char *f; 79 sigset_t asigset, osigset, emptysigset; 80 81 /* Initialise signal masks */ 82 RL(sigemptyset(&emptysigset)); 83 RL(sigemptyset(&asigset)); 84 RL(sigaddset(&asigset, SIGINFO)); 85 86 /* Register signal handlers for both read and writer */ 87 REQUIRE_LIBC(signal(SIGINFO, sighand), SIG_ERR); 88 REQUIRE_LIBC(signal(SIGALRM, sighand), SIG_ERR); 89 90 todo = 2 * 1024 * 1024; 91 REQUIRE_LIBC(f = malloc(todo), NULL); 92 93 RL(pipe(pp)); 94 95 RL(pid = fork()); 96 if (pid == 0) { 97 /* child */ 98 RL(close(pp[1])); 99 100 /* Do initial write. This should succeed, make 101 * the other side do partial write and wait for us to pick 102 * rest up. 103 */ 104 RL(done = read(pp[0], f, 128 * 1024)); 105 106 /* Wait until parent is alarmed and awakens us */ 107 RL(sigprocmask(SIG_BLOCK, &asigset, &osigset)); 108 while (nsiginfo == 0) { 109 if (sigsuspend(&emptysigset) != -1 || errno != EINTR) 110 atf_tc_fail("sigsuspend(&emptysigset): %s", 111 strerror(errno)); 112 } 113 RL(sigprocmask(SIG_SETMASK, &osigset, NULL)); 114 115 /* Read all what parent wants to give us */ 116 while((sz = read(pp[0], f, 1024 * 1024)) > 0) 117 done += sz; 118 119 /* 120 * Exit with 1 if number of bytes read doesn't match 121 * number of expected bytes 122 */ 123 printf("Read: %#zx\n", (size_t)done); 124 printf("Expected: %#zx\n", (size_t)todo); 125 126 exit(done != todo); 127 128 /* NOTREACHED */ 129 } else { 130 RL(close(pp[0])); 131 132 /* 133 * Arrange for alarm after two seconds. Since we have 134 * handler setup for SIGARLM, the write(2) call should 135 * be restarted internally by kernel. 136 */ 137 (void)alarm(2); 138 139 /* We write exactly 'todo' bytes. The very first write(2) 140 * should partially succeed, block and eventually 141 * be restarted by kernel 142 */ 143 while(todo > 0 && ((sz = write(pp[1], f, todo)) > 0)) 144 todo -= sz; 145 146 /* Close the pipe, so that child would stop reading */ 147 RL(close(pp[1])); 148 149 /* And pickup child's exit status */ 150 RL(waitpid(pid, &st, 0)); 151 152 ATF_REQUIRE_EQ(WEXITSTATUS(st), 0); 153 } 154 free(f); 155 } 156 157 ATF_TP_ADD_TCS(tp) 158 { 159 ATF_TP_ADD_TC(tp, pipe_restart); 160 161 return atf_no_error(); 162 } 163