tests/kernel/t_poll3w.c

   1 /* $NetBSD$ */
   2
   3 /*-
   4  * Copyright (c) 2002, 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("$NetBSD$");
  33
  34 #include <sys/types.h>
  35 #include <sys/wait.h>
  36
  37 #include <poll.h>
  38 #include <stdio.h>
  39 #include <string.h>
  40 #include <unistd.h>
  41
  42 #include <atf-c.h>
  43
  44 #include "../h_macros.h"
  45
  46 int desc;
  47
  48 static void
  49 child1(void)
  50 {
  51         struct pollfd pfd;
  52
  53         pfd.fd = desc;
  54         pfd.events = POLLIN | POLLHUP | POLLOUT;
  55
  56         (void)poll(&pfd, 1, 2000);
  57         (void)printf("child1 exit\n");
  58 }
  59
  60 static void
  61 child2(void)
  62 {
  63         struct pollfd pfd;
  64
  65         pfd.fd = desc;
  66         pfd.events = POLLIN | POLLHUP | POLLOUT;
  67
  68         (void)sleep(1);
  69         (void)poll(&pfd, 1, INFTIM);
  70         (void)printf("child2 exit\n");
  71 }
  72
  73 static void
  74 child3(void)
  75 {
  76         struct pollfd pfd;
  77
  78         (void)sleep(5);
  79
  80         pfd.fd = desc;
  81         pfd.events = POLLIN | POLLHUP | POLLOUT;
  82
  83         (void)poll(&pfd, 1, INFTIM);
  84         (void)printf("child3 exit\n");
  85 }
  86
  87 ATF_TC(poll);
  88 ATF_TC_HEAD(poll, tc)
  89 {
  90         atf_tc_set_md_var(tc, "timeout", "15");
  91         atf_tc_set_md_var(tc, "descr",
  92             "Check for 3-way collision for descriptor. First child comes "
  93             "and polls on descriptor, second child comes and polls, first "
  94             "child times out and exits, third child comes and polls. When "
  95             "the wakeup event happens, the two remaining children should "
  96             "both be awaken. (kern/17517)");
  97 }
  98 ATF_TC_BODY(poll, tc)
  99 {
 100         int pf[2];
 101         int status, i;
 102         pid_t pid;
 103
 104         pipe(pf);
 105         desc = pf[0];
 106
 107         RL((pid = fork()));
 108         if (pid == 0) {
 109                 (void)close(pf[1]);
 110                 child1();
 111                 _exit(0);
 112                 /* NOTREACHED */
 113         }
 114
 115         RL((pid = fork()));
 116         if (pid == 0) {
 117                 (void)close(pf[1]);
 118                 child2();
 119                 _exit(0);
 120                 /* NOTREACHED */
 121         }
 122
 123         RL((pid = fork()));
 124         if (pid == 0) {
 125                 (void)close(pf[1]);
 126                 child3();
 127                 _exit(0);
 128                 /* NOTREACHED */
 129         }
 130
 131         (void)sleep(10);
 132
 133         (void)printf("parent write\n");
 134
 135         RL(write(pf[1], "konec\n", 6));
 136
 137         for(i = 0; i < 3; ++i)
 138                 RL(wait(&status));
 139
 140         (void)printf("parent terminated\n");
 141 }
 142
 143 ATF_TP_ADD_TCS(tp)
 144 {
 145         ATF_TP_ADD_TC(tp, poll);
 146
 147         return atf_no_error();
 148 }