Home | History | Annotate | Line # | Download | only in vnode
vnode.c revision 1.3.16.1 
      1 /*	$NetBSD: vnode.c,v 1.3.16.1 2008/05/18 12:30:48 yamt 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 %ld.%06ld\n",
    102 			argv[1],
    103 			n, diff.tv_sec, 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