Home | History | Annotate | Line # | Download | only in vnode
vnode.c revision 1.2 
      1 /*	$NetBSD: vnode.c,v 1.2 2003/10/21 09:42:48 itojun 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  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the NetBSD
     21  *	Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/param.h>
     40 #include <sys/event.h>
     41 #include <sys/time.h>
     42 
     43 #include <err.h>
     44 #include <errno.h>
     45 #include <fcntl.h>
     46 #include <stdio.h>
     47 #include <stdlib.h>
     48 #include <unistd.h>
     49 #include <inttypes.h>
     50 
     51 int
     52 main(int argc, char **argv)
     53 {
     54 	struct timespec	timeout;
     55 	struct timeval	then, now, diff;
     56 	struct kevent	event[2];
     57 	char		buffer[128], *pref;
     58 	int		fd, kq, n, i;
     59 
     60 	if (argc != 2)
     61 		errx(1, "Usage: %s file", argv[0]);
     62 
     63 	fd = open(argv[1], O_RDONLY|O_CREAT, 0644);
     64 	if (fd == -1)
     65 		err(1, "open: %s", argv[1]);
     66 
     67 #if 0
     68 	sprintf(buffer, "/mnt/fd/%d", fd);
     69 	if ((fd = open(buffer, O_RDONLY)) < 0)
     70 		err(1, "open fdesc: %s", buffer);
     71 #endif
     72 
     73 #ifdef READ_TEST
     74 	lseek(fd, 0, SEEK_END);
     75 #endif
     76 
     77         kq = kqueue();
     78         if (kq == -1)
     79                 err(1, "kqueue");
     80 
     81 	i=0;
     82 	EV_SET(&event[i], fd, EVFILT_VNODE, EV_ADD | EV_ENABLE | EV_CLEAR,
     83 		NOTE_DELETE | NOTE_WRITE | NOTE_EXTEND | NOTE_ATTRIB |
     84 		NOTE_LINK | NOTE_RENAME | NOTE_REVOKE, 0, 0);
     85 	i++;
     86 
     87 #ifdef READ_TEST
     88 	EV_SET(&event[i], fd, EVFILT_READ, EV_ADD | EV_ENABLE, 0, NULL, NULL);
     89 	i++;
     90 	printf("i is %d\n", i);
     91 #endif
     92 
     93 	n = kevent(kq, event, i, NULL, 0, NULL);
     94 	if (n == -1)
     95 		err(1, "kevent(1)");
     96 
     97 	timeout.tv_sec = 60;
     98 	timeout.tv_nsec = 0;
     99 
    100 	for (;;) {
    101 		pref="";
    102 		if (gettimeofday(&then, NULL) == -1)
    103 			err(1, "gettimeofday then");
    104 		n = kevent(kq, NULL, 0, event, 1, &timeout);
    105 		if (gettimeofday(&now, NULL) == -1)
    106 			err(1, "gettimeofday now");
    107 		timersub(&now, &then, &diff);
    108 		printf("vnode '%s': kevent returned %d in %ld.%06ld\n",
    109 			argv[1],
    110 			n, diff.tv_sec, diff.tv_usec);
    111 
    112 		if (n == -1)
    113 			err(1, "kevent");
    114 		else if (n == 0)
    115 			continue;
    116 
    117 		printf("vnode '%s': kevent: filter %d flags: 0x%02x, fflags: 0x%02x [",
    118 		    argv[1],
    119 		    event[0].filter, event[0].flags, event[0].fflags);
    120 
    121 #define DUMPFLAG(x) \
    122 	do \
    123 		if (event[0].fflags & x) { \
    124 			printf ("%s%s", pref, #x); \
    125 			pref=", "; \
    126 		} \
    127 	while (0)
    128 
    129 		DUMPFLAG(NOTE_DELETE);
    130 		DUMPFLAG(NOTE_WRITE);
    131 		DUMPFLAG(NOTE_EXTEND);
    132 		DUMPFLAG(NOTE_ATTRIB);
    133 		DUMPFLAG(NOTE_LINK);
    134 		DUMPFLAG(NOTE_RENAME);
    135 		DUMPFLAG(NOTE_REVOKE);
    136 		printf("], data %" PRId64 "\n", event[0].data);
    137 
    138 		if (event[0].filter == EVFILT_READ) {
    139 			if (event[0].data < 0)
    140 				lseek(fd, 0, SEEK_END);
    141 			n = read(fd, buffer, 128);
    142 			buffer[n] = '\0';
    143 			printf("[%d] %s", n, buffer);
    144 		}
    145 
    146 		if (event[0].fflags & NOTE_REVOKE) {
    147 			printf("%s revoked\n", argv[1]);
    148 			break;
    149 		}
    150 	}
    151 	return (0);
    152 }
    153