usr.bin/monitor/monitor.c

   1 /*
   2  * Copyright (c) 2008 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/usr.bin/monitor/monitor.c,v 1.1 2008/10/16 17:23:20 dillon Exp $
  35  */
  36
  37 #include <sys/types.h>
  38 #include <sys/event.h>
  39 #include <sys/time.h>
  40 #include <sys/stat.h>
  41 #include <stdio.h>
  42 #include <stdarg.h>
  43 #include <stdlib.h>
  44 #include <unistd.h>
  45 #include <string.h>
  46 #include <fcntl.h>
  47
  48 typedef struct monitor_elm {
  49         const char *path;
  50         int     fd;
  51 } *monitor_elm_t;
  52
  53 static void usage(int exit_code);
  54 static void monitor_add(const char *path);
  55 static void monitor_events(void);
  56
  57 static int VerboseOpt;
  58 static int QuietOpt;
  59 static int ExitOpt;
  60 static int KQueueFd;
  61 static int NumFiles;
  62 static int MaxFiles;
  63 static monitor_elm_t *Elms;
  64
  65 int
  66 main(int ac, char **av)
  67 {
  68         int ch;
  69         int i;
  70
  71         while ((ch = getopt(ac, av, "qvx")) != -1) {
  72                 switch(ch) {
  73                 case 'q':
  74                         if (VerboseOpt > 0)
  75                                 --VerboseOpt;
  76                         else
  77                                 ++QuietOpt;
  78                         break;
  79                 case 'v':
  80                         if (QuietOpt > 0)
  81                                 --QuietOpt;
  82                         else
  83                                 ++VerboseOpt;
  84                         break;
  85                 case 'x':
  86                         ExitOpt = 1;
  87                         break;
  88                 default:
  89                         usage(1);
  90                         /* not reached */
  91                 }
  92         }
  93         ac -= optind;
  94         av += optind;
  95
  96         if (ac < 1) {
  97                 usage(1);
  98                 /* not reached */
  99         }
 100
 101         if ((KQueueFd = kqueue()) < 0) {
 102                 perror("kqueue");
 103                 exit(1);
 104         }
 105         NumFiles = MaxFiles = 16;
 106         Elms = calloc(MaxFiles, sizeof(monitor_elm_t));
 107
 108         for (i = 0; i < ac; ++i) {
 109                 monitor_add(av[i]);
 110         }
 111         fflush(stdout);
 112         do {
 113                 monitor_events();
 114                 fflush(stdout);
 115         } while (ExitOpt == 0);
 116         exit(0);
 117 }
 118
 119 static
 120 void
 121 monitor_add(const char *path)
 122 {
 123         monitor_elm_t elm;
 124         struct kevent kev;
 125         int n;
 126
 127         elm = malloc(sizeof(*elm));
 128         bzero(elm, sizeof(*elm));
 129         elm->path = path;
 130         elm->fd = open(path, O_RDONLY);
 131         if (elm->fd < 0) {
 132                 printf("%s\tnot found\n", path);
 133                 return;
 134         }
 135         EV_SET(&kev, elm->fd, EVFILT_VNODE, EV_ADD|EV_ENABLE|EV_CLEAR,
 136                NOTE_DELETE|NOTE_WRITE|NOTE_EXTEND|NOTE_ATTRIB|
 137                NOTE_LINK|NOTE_RENAME|NOTE_REVOKE,
 138                0, NULL);
 139         n = kevent(KQueueFd, &kev, 1, NULL, 0, NULL);
 140         if (n < 0) {
 141                 perror("kqueue");
 142                 exit(1);
 143         }
 144
 145         if (elm->fd >= NumFiles) {
 146                 MaxFiles = (elm->fd + 16) * 3 / 2;
 147                 Elms = realloc(Elms, MaxFiles * sizeof(elm));
 148                 bzero(&Elms[NumFiles], (MaxFiles - NumFiles) * sizeof(elm));
 149                 NumFiles = MaxFiles;
 150         }
 151         Elms[elm->fd] = elm;
 152 }
 153
 154 static
 155 void
 156 monitor_events(void)
 157 {
 158         struct kevent kev_array[1];
 159         struct kevent *kev;
 160         monitor_elm_t elm;
 161         struct stat st;
 162         int bno;
 163         int i;
 164         int n;
 165
 166         n = kevent(KQueueFd, NULL, 0, kev_array, 1, NULL);
 167         for (i = 0; i < n; ++i) {
 168                 kev = &kev_array[i];
 169                 elm = Elms[kev->ident];
 170                 printf("%-23s", elm->path);
 171                 if (VerboseOpt && fstat(kev->ident, &st) == 0 &&
 172                     S_ISREG(st.st_mode)) {
 173                         printf(" %10jd", (intmax_t)st.st_size);
 174                 }
 175                 while (QuietOpt == 0 && (bno = ffs(kev->fflags)) > 0) {
 176                         printf(" ");
 177                         --bno;
 178                         kev->fflags &= ~(1 << bno);
 179                         switch(1 << bno) {
 180                         case NOTE_DELETE:
 181                                 printf("delete");
 182                                 break;
 183                         case NOTE_WRITE:
 184                                 printf("write");
 185                                 break;
 186                         case NOTE_EXTEND:
 187                                 printf("extend");
 188                                 break;
 189                         case NOTE_ATTRIB:
 190                                 printf("attrib");
 191                                 break;
 192                         case NOTE_LINK:
 193                                 printf("link");
 194                                 break;
 195                         case NOTE_RENAME:
 196                                 printf("rename");
 197                                 break;
 198                         case NOTE_REVOKE:
 199                                 printf("revoke");
 200                                 break;
 201                         default:
 202                                 printf("%08x", 1 << bno);
 203                                 break;
 204                         }
 205                 }
 206                 printf("\n");
 207         }
 208 }
 209
 210 static
 211 void
 212 usage(int exit_code)
 213 {
 214         fprintf(stderr,
 215                 "monitor [-vx] files...\n"
 216                 "    -v      Be more verbose\n"
 217                 "    -x      Exit after first event reported\n"
 218         );
 219         exit(exit_code);
 220 }
 221