1 /* $NetBSD: t_pipe.c,v 1.7 2020/06/26 07:50:11 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 1.7 2020/06/26 07:50:11 jruoho Exp $");
33
34 #include <sys/types.h>
35 #include <sys/wait.h>
36
37 #include <errno.h>
38 #include <fcntl.h>
39 #include <poll.h>
40 #include <sched.h>
41 #include <signal.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <unistd.h>
45
46 #include <atf-c.h>
47
48 #include "h_macros.h"
49
50 static pid_t pid;
51 static int nsiginfo = 0;
52
53 /*
54 * This is used for both parent and child. Handle parent's SIGALRM,
55 * the childs SIGINFO doesn't need anything.
56 */
57 static void
sighand(int sig)58 sighand(int sig)
59 {
60 if (sig == SIGALRM) {
61 kill(pid, SIGINFO);
62 }
63 if (sig == SIGINFO) {
64 nsiginfo++;
65 }
66 }
67
68 ATF_TC(pipe_restart);
ATF_TC_HEAD(pipe_restart,tc)69 ATF_TC_HEAD(pipe_restart, tc)
70 {
71 atf_tc_set_md_var(tc, "descr", "Checks that writing to pipe "
72 "works correctly after being interrupted and restarted "
73 "(PR kern/14087)");
74 }
75
ATF_TC_BODY(pipe_restart,tc)76 ATF_TC_BODY(pipe_restart, tc)
77 {
78 int pp[2], st;
79 ssize_t sz, todo, done;
80 char *f;
81 sigset_t asigset, osigset, emptysigset;
82
83 /* Initialise signal masks */
84 RL(sigemptyset(&emptysigset));
85 RL(sigemptyset(&asigset));
86 RL(sigaddset(&asigset, SIGINFO));
87
88 /* Register signal handlers for both read and writer */
89 REQUIRE_LIBC(signal(SIGINFO, sighand), SIG_ERR);
90 REQUIRE_LIBC(signal(SIGALRM, sighand), SIG_ERR);
91
92 todo = 2 * 1024 * 1024;
93 REQUIRE_LIBC(f = malloc(todo), NULL);
94
95 RL(pipe(pp));
96
97 RL(pid = fork());
98 if (pid == 0) {
99 /* child */
100 RL(close(pp[1]));
101
102 /* Do initial write. This should succeed, make
103 * the other side do partial write and wait for us to pick
104 * rest up.
105 */
106 RL(done = read(pp[0], f, 128 * 1024));
107
108 /* Wait until parent is alarmed and awakens us */
109 RL(sigprocmask(SIG_BLOCK, &asigset, &osigset));
110 while (nsiginfo == 0) {
111 if (sigsuspend(&emptysigset) != -1 || errno != EINTR)
112 atf_tc_fail("sigsuspend(&emptysigset): %s",
113 strerror(errno));
114 }
115 RL(sigprocmask(SIG_SETMASK, &osigset, NULL));
116
117 /* Read all what parent wants to give us */
118 while((sz = read(pp[0], f, 1024 * 1024)) > 0)
119 done += sz;
120
121 /*
122 * Exit with 1 if number of bytes read doesn't match
123 * number of expected bytes
124 */
125 printf("Read: %#zx\n", (size_t)done);
126 printf("Expected: %#zx\n", (size_t)todo);
127
128 exit(done != todo);
129
130 /* NOTREACHED */
131 } else {
132 RL(close(pp[0]));
133
134 /*
135 * Arrange for alarm after two seconds. Since we have
136 * handler setup for SIGARLM, the write(2) call should
137 * be restarted internally by kernel.
138 */
139 (void)alarm(2);
140
141 /* We write exactly 'todo' bytes. The very first write(2)
142 * should partially succeed, block and eventually
143 * be restarted by kernel
144 */
145 while(todo > 0 && ((sz = write(pp[1], f, todo)) > 0))
146 todo -= sz;
147
148 /* Close the pipe, so that child would stop reading */
149 RL(close(pp[1]));
150
151 /* And pickup child's exit status */
152 RL(waitpid(pid, &st, 0));
153
154 ATF_REQUIRE_EQ(WEXITSTATUS(st), 0);
155 }
156 free(f);
157 }
158
ATF_TP_ADD_TCS(tp)159 ATF_TP_ADD_TCS(tp)
160 {
161 ATF_TP_ADD_TC(tp, pipe_restart);
162
163 return atf_no_error();
164 }
165