1 /* $NetBSD: vnode.c,v 1.5 2008/12/29 05:56:02 christos 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 } 148