tests/kernel/kqueue/write/t_fifo.c

   1 /* $NetBSD$ */
   2
   3 /*-
   4  * Copyright (c) 2002, 2008 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("$NetBSD$");
  36
  37 #include <sys/event.h>
  38 #include <sys/stat.h>
  39 #include <sys/wait.h>
  40
  41 #include <fcntl.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <unistd.h>
  46
  47 #include <atf-c.h>
  48
  49 #include "../../../h_macros.h"
  50
  51 #define FIFONAME "fifo"
  52
  53 ATF_TC(fifo);
  54 ATF_TC_HEAD(fifo, tc)
  55 {
  56         atf_tc_set_md_var(tc, "descr", "Checks EVFILT_WRITE for fifo");
  57 }
  58 ATF_TC_BODY(fifo, tc)
  59 {
  60         char buffer[128];
  61         struct kevent event[1];
  62         pid_t child;
  63         int kq, n, fd, status;
  64
  65         RL(mkfifo(FIFONAME, 0644));
  66         RL(fd = open(FIFONAME, O_RDWR, 0644));
  67         RL(kq = kqueue());
  68
  69         /* spawn child reader */
  70         RL(child = fork());
  71         if (child == 0) {
  72                 int sz = read(fd, buffer, 128);
  73                 if (sz > 0)
  74                         (void)printf("fifo: child read '%.*s'\n", sz, buffer);
  75                 _exit(sz <= 0);
  76         }
  77
  78         EV_SET(&event[0], fd, EVFILT_WRITE, EV_ADD|EV_ENABLE, 0, 0, 0);
  79         RL(kevent(kq, event, 1, NULL, 0, NULL));
  80
  81         (void)memset(event, 0, sizeof(event));
  82         RL(n = kevent(kq, NULL, 0, event, 1, NULL));
  83
  84         (void)printf("kevent num %d filt %d flags: %#x, fflags: %#x, "
  85             "data: %" PRId64 "\n", n, event[0].filter, event[0].flags,
  86             event[0].fflags, event[0].data);
  87
  88         ATF_REQUIRE_EQ(event[0].filter, EVFILT_WRITE);
  89
  90         RL(write(fd, "foo", 3));
  91         (void)printf("fifo: wrote 'foo'\n");
  92         RL(close(fd));
  93
  94         (void)waitpid(child, &status, 0);
  95 }
  96
  97 ATF_TP_ADD_TCS(tp)
  98 {
  99         ATF_TP_ADD_TC(tp, fifo);
 100
 101         return atf_no_error();
 102 }