regress/sys/kern/kqueue/vnode/vnode.c

   1 /*      $NetBSD: vnode.c,v 1.4 2008/04/28 20:23:06 martin 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.
   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/param.h>
  33 #include <sys/event.h>
  34 #include <sys/time.h>
  35
  36 #include <err.h>
  37 #include <errno.h>
  38 #include <fcntl.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <unistd.h>
  42 #include <inttypes.h>
  43
  44 int
  45 main(int argc, char **argv)
  46 {
  47         struct timespec timeout;
  48         struct timeval  then, now, diff;
  49         struct kevent   event[2];
  50         char            buffer[128], *pref;
  51         int             fd, kq, n, i;
  52
  53         if (argc != 2)
  54                 errx(1, "Usage: %s file", argv[0]);
  55
  56         fd = open(argv[1], O_RDONLY|O_CREAT, 0644);
  57         if (fd == -1)
  58                 err(1, "open: %s", argv[1]);
  59
  60 #if 0
  61         sprintf(buffer, "/mnt/fd/%d", fd);
  62         if ((fd = open(buffer, O_RDONLY)) < 0)
  63                 err(1, "open fdesc: %s", buffer);
  64 #endif
  65
  66 #ifdef READ_TEST
  67         lseek(fd, 0, SEEK_END);
  68 #endif
  69
  70         kq = kqueue();
  71         if (kq == -1)
  72                 err(1, "kqueue");
  73
  74         i=0;
  75         EV_SET(&event[i], fd, EVFILT_VNODE, EV_ADD | EV_ENABLE | EV_CLEAR,
  76                 NOTE_DELETE | NOTE_WRITE | NOTE_EXTEND | NOTE_ATTRIB |
  77                 NOTE_LINK | NOTE_RENAME | NOTE_REVOKE, 0, 0);
  78         i++;
  79
  80 #ifdef READ_TEST
  81         EV_SET(&event[i], fd, EVFILT_READ, EV_ADD | EV_ENABLE, 0, NULL, NULL);
  82         i++;
  83         printf("i is %d\n", i);
  84 #endif
  85
  86         n = kevent(kq, event, i, NULL, 0, NULL);
  87         if (n == -1)
  88                 err(1, "kevent(1)");
  89
  90         timeout.tv_sec = 60;
  91         timeout.tv_nsec = 0;
  92
  93         for (;;) {
  94                 pref="";
  95                 if (gettimeofday(&then, NULL) == -1)
  96                         err(1, "gettimeofday then");
  97                 n = kevent(kq, NULL, 0, event, 1, &timeout);
  98                 if (gettimeofday(&now, NULL) == -1)
  99                         err(1, "gettimeofday now");
 100                 timersub(&now, &then, &diff);
 101                 printf("vnode '%s': kevent returned %d in %lld.%06ld\n",
 102                         argv[1],
 103                         n, (long long)diff.tv_sec, (long)diff.tv_usec);
 104
 105                 if (n == -1)
 106                         err(1, "kevent");
 107                 else if (n == 0)
 108                         continue;
 109
 110                 printf("vnode '%s': kevent: filter %d flags: 0x%02x, fflags: 0x%02x [",
 111                     argv[1],
 112                     event[0].filter, event[0].flags, event[0].fflags);
 113
 114 #define DUMPFLAG(x) \
 115         do \
 116                 if (event[0].fflags & x) { \
 117                         printf ("%s%s", pref, #x); \
 118                         pref=", "; \
 119                 } \
 120         while (0)
 121
 122                 DUMPFLAG(NOTE_DELETE);
 123                 DUMPFLAG(NOTE_WRITE);
 124                 DUMPFLAG(NOTE_EXTEND);
 125                 DUMPFLAG(NOTE_ATTRIB);
 126                 DUMPFLAG(NOTE_LINK);
 127                 DUMPFLAG(NOTE_RENAME);
 128                 DUMPFLAG(NOTE_REVOKE);
 129                 printf("], data %" PRId64 "\n", event[0].data);
 130
 131                 if (event[0].filter == EVFILT_READ) {
 132                         if (event[0].data < 0)
 133                                 lseek(fd, 0, SEEK_END);
 134                         n = read(fd, buffer, 128);
 135                         if (n < 0)
 136                                 err(1, "read");
 137                         buffer[n] = '\0';
 138                         printf("[%d] %s", n, buffer);
 139                 }
 140
 141                 if (event[0].fflags & NOTE_REVOKE) {
 142                         printf("%s revoked\n", argv[1]);
 143                         break;
 144                 }
 145         }
 146         return (0);
 147 }