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148 lines
3.9 KiB
C
148 lines
3.9 KiB
C
/* $NetBSD: vnode.c,v 1.5 2008/12/29 05:56:02 christos Exp $ */
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/*-
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* Copyright (c) 2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Luke Mewburn.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/event.h>
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#include <sys/time.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <inttypes.h>
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int
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main(int argc, char **argv)
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{
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struct timespec timeout;
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struct timeval then, now, diff;
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struct kevent event[2];
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char buffer[128], *pref;
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int fd, kq, n, i;
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if (argc != 2)
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errx(1, "Usage: %s file", argv[0]);
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fd = open(argv[1], O_RDONLY|O_CREAT, 0644);
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if (fd == -1)
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err(1, "open: %s", argv[1]);
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#if 0
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sprintf(buffer, "/mnt/fd/%d", fd);
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if ((fd = open(buffer, O_RDONLY)) < 0)
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err(1, "open fdesc: %s", buffer);
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#endif
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#ifdef READ_TEST
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lseek(fd, 0, SEEK_END);
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#endif
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kq = kqueue();
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if (kq == -1)
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err(1, "kqueue");
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i=0;
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EV_SET(&event[i], fd, EVFILT_VNODE, EV_ADD | EV_ENABLE | EV_CLEAR,
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NOTE_DELETE | NOTE_WRITE | NOTE_EXTEND | NOTE_ATTRIB |
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NOTE_LINK | NOTE_RENAME | NOTE_REVOKE, 0, 0);
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i++;
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#ifdef READ_TEST
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EV_SET(&event[i], fd, EVFILT_READ, EV_ADD | EV_ENABLE, 0, NULL, NULL);
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i++;
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printf("i is %d\n", i);
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#endif
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n = kevent(kq, event, i, NULL, 0, NULL);
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if (n == -1)
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err(1, "kevent(1)");
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timeout.tv_sec = 60;
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timeout.tv_nsec = 0;
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for (;;) {
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pref="";
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if (gettimeofday(&then, NULL) == -1)
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err(1, "gettimeofday then");
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n = kevent(kq, NULL, 0, event, 1, &timeout);
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if (gettimeofday(&now, NULL) == -1)
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err(1, "gettimeofday now");
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timersub(&now, &then, &diff);
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printf("vnode '%s': kevent returned %d in %lld.%06ld\n",
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argv[1],
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n, (long long)diff.tv_sec, (long)diff.tv_usec);
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if (n == -1)
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err(1, "kevent");
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else if (n == 0)
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continue;
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printf("vnode '%s': kevent: filter %d flags: 0x%02x, fflags: 0x%02x [",
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argv[1],
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event[0].filter, event[0].flags, event[0].fflags);
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#define DUMPFLAG(x) \
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do \
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if (event[0].fflags & x) { \
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printf ("%s%s", pref, #x); \
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pref=", "; \
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} \
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while (0)
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DUMPFLAG(NOTE_DELETE);
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DUMPFLAG(NOTE_WRITE);
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DUMPFLAG(NOTE_EXTEND);
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DUMPFLAG(NOTE_ATTRIB);
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DUMPFLAG(NOTE_LINK);
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DUMPFLAG(NOTE_RENAME);
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DUMPFLAG(NOTE_REVOKE);
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printf("], data %" PRId64 "\n", event[0].data);
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if (event[0].filter == EVFILT_READ) {
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if (event[0].data < 0)
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lseek(fd, 0, SEEK_END);
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n = read(fd, buffer, 128);
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if (n < 0)
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err(1, "read");
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buffer[n] = '\0';
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printf("[%d] %s", n, buffer);
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}
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if (event[0].fflags & NOTE_REVOKE) {
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printf("%s revoked\n", argv[1]);
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break;
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}
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}
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return (0);
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}
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