tests/kernel/kqueue/write/t_pipe.c

   1 /* $NetBSD: t_pipe.c,v 1.1 2009/02/20 21:39:57 jmmv Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Luke Mewburn and Jaromir Dolecek.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __COPYRIGHT("@(#) Copyright (c) 2008\
  34  The NetBSD Foundation, inc. All rights reserved.");
  35 __RCSID("$NetBSD: t_pipe.c,v 1.1 2009/02/20 21:39:57 jmmv Exp $");
  36
  37 #include <sys/event.h>
  38 #include <sys/wait.h>
  39
  40 #include <fcntl.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
  49 ATF_TC(pipe1);
  50 ATF_TC_HEAD(pipe1, tc)
  51 {
  52         atf_tc_set_md_var(tc, "descr",
  53             "Checks EVFILT_WRITE for pipes. This test used to trigger "
  54             "problem fixed in rev. 1.5.2.7 of sys/kern/sys_pipe.c");
  55 }
  56 ATF_TC_BODY(pipe1, tc)
  57 {
  58         struct kevent event[1];
  59         int fds[2];
  60         int kq, n;
  61
  62         RL(pipe(fds));
  63         RL(kq = kqueue());
  64         RL(close(fds[0]));
  65
  66         EV_SET(&event[0], fds[1], EVFILT_WRITE, EV_ADD|EV_ENABLE, 0, 0, 0);
  67         ATF_REQUIRE_EQ_MSG((n = kevent(kq, event, 1, NULL, 0, NULL)),
  68             -1, "got: %d", n);
  69         ATF_REQUIRE_EQ_MSG(errno, EBADF, "got: %s", strerror(errno));
  70 }
  71
  72 ATF_TC(pipe2);
  73 ATF_TC_HEAD(pipe2, tc)
  74 {
  75         atf_tc_set_md_var(tc, "descr",
  76             "Checks EVFILT_WRITE for pipes. This test used to trigger problem "
  77             "fixed in rev. 1.5.2.9 of sys/kern/sys_pipe.c");
  78 }
  79 ATF_TC_BODY(pipe2, tc)
  80 {
  81         struct kevent event[1];
  82         char buffer[128];
  83         int fds[2];
  84         int kq, n;
  85         int status;
  86         pid_t child;
  87
  88         RL(pipe(fds));
  89         RL(kq = kqueue());
  90
  91         EV_SET(&event[0], fds[1], EVFILT_WRITE, EV_ADD|EV_ENABLE, 0, 0, 0);
  92         RL(kevent(kq, event, 1, NULL, 0, NULL));
  93
  94         /* spawn child reader */
  95         RL(child = fork());
  96         if (child == 0) {
  97                 int sz = read(fds[0], buffer, 128);
  98                 if (sz > 0)
  99                         (void)printf("pipe: child read '%.*s'\n", sz, buffer);
 100                 exit(sz <= 0);
 101         }
 102
 103         RL(n = kevent(kq, NULL, 0, event, 1, NULL));
 104
 105         (void)printf("kevent num %d flags: %#x, fflags: %#x, data: "
 106             "%" PRId64 "\n", n, event[0].flags, event[0].fflags, event[0].data);
 107
 108         RL(n = write(fds[1], "foo", 3));
 109         RL(close(fds[1]));
 110
 111         (void)waitpid(child, &status, 0);
 112 }
 113
 114 ATF_TC(pipe3);
 115 ATF_TC_HEAD(pipe3, tc)
 116 {
 117         atf_tc_set_md_var(tc, "descr",
 118             "Checks EVFILT_WRITE for pipes. This test used to trigger problem "
 119             "fixed in rev. 1.5.2.10 of sys/kern/sys_pipe.c");
 120 }
 121 ATF_TC_BODY(pipe3, tc)
 122 {
 123         struct kevent event[1];
 124         int fds[2];
 125         int kq;
 126
 127         RL(pipe(fds));
 128         RL(kq = kqueue());
 129
 130         EV_SET(&event[0], fds[1], EVFILT_WRITE, EV_ADD|EV_ENABLE, 0, 0, 0);
 131         RL(kevent(kq, event, 1, NULL, 0, NULL));
 132
 133         /* close 'read' end first, then 'write' */
 134
 135         RL(close(fds[0]));
 136         RL(close(fds[1]));
 137 }
 138
 139
 140 ATF_TP_ADD_TCS(tp)
 141 {
 142         ATF_TP_ADD_TC(tp, pipe1);
 143         ATF_TP_ADD_TC(tp, pipe2);
 144         ATF_TP_ADD_TC(tp, pipe3);
 145
 146         return atf_no_error();
 147 }