tests/kernel/kqueue/t_sig.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/ioctl.h>
  39 #include <sys/param.h>
  40 #include <sys/time.h>
  41 #include <sys/wait.h>
  42
  43 #include <inttypes.h>
  44 #include <signal.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <unistd.h>
  48
  49 #include <atf-c.h>
  50
  51 #include "../../h_macros.h"
  52
  53 #define NSIGNALS 5
  54
  55 ATF_TC(sig);
  56 ATF_TC_HEAD(sig, tc)
  57 {
  58         atf_tc_set_md_var(tc, "descr", "Checks EVFILT_SIGNAL");
  59 }
  60 ATF_TC_BODY(sig, tc)
  61 {
  62         struct timespec timeout;
  63         struct kfilter_mapping km;
  64         struct kevent event[1];
  65         char namebuf[32];
  66         pid_t pid, child;
  67         int kq, n, num, status;
  68
  69         pid = getpid();
  70         (void)printf("my pid: %d\n", pid);
  71
  72         /* fork a child to send signals */
  73         RL(child = fork());
  74         if (child == 0) {
  75                 int i;
  76                 (void)sleep(2);
  77                 for(i = 0; i < NSIGNALS; ++i) {
  78                         (void)kill(pid, SIGUSR1);
  79                         (void)sleep(2);
  80                 }
  81                 _exit(0);
  82                 /* NOTREACHED */
  83         }
  84
  85         RL(kq = kqueue());
  86
  87         (void)strlcpy(namebuf, "EVFILT_SIGNAL", sizeof(namebuf));
  88         km.name = namebuf;
  89         RL(ioctl(kq, KFILTER_BYNAME, &km));
  90         (void)printf("got %d as filter number for `%s'.\n", km.filter, km.name);
  91
  92         /* ignore the signal to avoid taking it for real */
  93         REQUIRE_LIBC(signal(SIGUSR1, SIG_IGN), SIG_ERR);
  94
  95         event[0].ident = SIGUSR1;
  96         event[0].filter = km.filter;
  97         event[0].flags = EV_ADD | EV_ENABLE;
  98
  99         RL(kevent(kq, event, 1, NULL, 0, NULL));
 100
 101         (void)sleep(1);
 102
 103         timeout.tv_sec = 1;
 104         timeout.tv_nsec = 0;
 105
 106         for (num = 0; num < NSIGNALS; num += n) {
 107                 struct timeval then, now, diff;
 108
 109                 RL(gettimeofday(&then, NULL));
 110                 RL(n = kevent(kq, NULL, 0, event, 1, &timeout));
 111                 RL(gettimeofday(&now, NULL));
 112                 timersub(&now, &then, &diff);
 113
 114                 (void)printf("sig: kevent returned %d in %ld.%06ld\n",
 115                     n, diff.tv_sec, diff.tv_usec);
 116
 117                 if (n == 0)
 118                         continue;
 119
 120                 (void)printf("sig: kevent flags: 0x%x, data: %" PRId64 " (# "
 121                     "times signal posted)\n", event[0].flags, event[0].data);
 122         }
 123
 124         (void)waitpid(child, &status, 0);
 125         (void)printf("sig: finished successfully\n");
 126 }
 127
 128 ATF_TP_ADD_TCS(tp)
 129 {
 130         ATF_TP_ADD_TC(tp, sig);
 131
 132         return atf_no_error();
 133 }