nscd/nscd_stat.c

   1 /* Copyright (c) 1998 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1998.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA. */
  19
  20 #include <errno.h>
  21 #include <error.h>
  22 #include <langinfo.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27
  28 #include "nscd.h"
  29 #include "dbg_log.h"
  30
  31 /* We use this to make sure the receiver is the same.  */
  32 static const char compilation[21] = __DATE__ " " __TIME__;
  33
  34 /* Statistic data for one database.  */
  35 struct dbstat
  36 {
  37   int enabled;
  38   int check_file;
  39   size_t module;
  40
  41   unsigned long int postimeout;
  42   unsigned long int negtimeout;
  43
  44   unsigned long int poshit;
  45   unsigned long int neghit;
  46   unsigned long int posmiss;
  47   unsigned long int negmiss;
  48 };
  49
  50 /* Record for transmitting statistics.  */
  51 struct statdata
  52 {
  53   char version[sizeof (compilation)];
  54   int debug_level;
  55   int ndbs;
  56   struct dbstat dbs[lastdb];
  57 };
  58
  59
  60 void
  61 send_stats (int fd, struct database dbs[lastdb])
  62 {
  63   struct statdata data;
  64   int cnt;
  65
  66   memcpy (data.version, compilation, sizeof (compilation));
  67   data.debug_level = debug_level;
  68   data.ndbs = lastdb;
  69
  70   for (cnt = 0; cnt < lastdb; ++cnt)
  71     {
  72       data.dbs[cnt].enabled = dbs[cnt].enabled;
  73       data.dbs[cnt].check_file = dbs[cnt].check_file;
  74       data.dbs[cnt].module = dbs[cnt].module;
  75       data.dbs[cnt].postimeout = dbs[cnt].postimeout;
  76       data.dbs[cnt].negtimeout = dbs[cnt].negtimeout;
  77       data.dbs[cnt].poshit = dbs[cnt].poshit;
  78       data.dbs[cnt].neghit = dbs[cnt].neghit;
  79       data.dbs[cnt].posmiss = dbs[cnt].posmiss;
  80       data.dbs[cnt].negmiss = dbs[cnt].negmiss;
  81     }
  82
  83   if (TEMP_FAILURE_RETRY (write (fd, &data, sizeof (data))) != sizeof (data))
  84     {
  85       char buf[256];
  86       dbg_log (_("cannot write statistics: %s"),
  87                strerror_r (errno, buf, sizeof (buf)));
  88     }
  89 }
  90
  91
  92 int
  93 receive_print_stats (void)
  94 {
  95   struct statdata data;
  96   request_header req;
  97   ssize_t nbytes;
  98   int fd;
  99   int i;
 100
 101   /* Open a socket to the running nscd.  */
 102   fd = nscd_open_socket ();
 103   if (fd == -1)
 104     error (EXIT_FAILURE, 0, _("nscd not running!\n"));
 105
 106   /* Send the request.  */
 107   req.version = NSCD_VERSION;
 108   req.type = GETSTAT;
 109   req.key_len = 0;
 110   nbytes = TEMP_FAILURE_RETRY (write (fd, &req, sizeof (request_header)));
 111   if (nbytes != sizeof (request_header))
 112     {
 113       int err = errno;
 114       close (fd);
 115       error (EXIT_FAILURE, err, _("write incomplete"));
 116     }
 117
 118   /* Read as much data as we expect.  */
 119   if (TEMP_FAILURE_RETRY (read (fd, &data, sizeof (data))) != sizeof (data)
 120       || (memcmp (data.version, compilation, sizeof (compilation)) != 0
 121           /* Yes, this is an assignment!  */
 122           && errno == EINVAL))
 123     {
 124       /* Not the right version.  */
 125       int err = errno;
 126       close (fd);
 127       error (EXIT_FAILURE, err, _("cannot read statistics data"));
 128     }
 129
 130   printf (_("nscd configuration:\n\n%15d  server debug level\n"),
 131           data.debug_level);
 132
 133   for (i = 0; i < lastdb; ++i)
 134     {
 135       unsigned long int hit = data.dbs[i].poshit + data.dbs[i].neghit;
 136       unsigned long int all = hit + data.dbs[i].posmiss + data.dbs[i].negmiss;
 137       const char *enabled = nl_langinfo (data.dbs[i].enabled ? YESSTR : NOSTR);
 138       const char *check_file = nl_langinfo (data.dbs[i].check_file
 139                                             ? YESSTR : NOSTR);
 140
 141       if (enabled[0] == '\0')
 142         /* The locale does not provide this information so we have to
 143            translate it ourself.  Since we should avoid short translation
 144            terms we artifically increase the length.  */
 145         enabled = data.dbs[i].enabled ? _("     yes") : _("      no");
 146       if (check_file[0] == '\0')
 147         check_file = data.dbs[i].check_file ? _("     yes") : _("      no");
 148
 149       if (all == 0)
 150         /* If nothing happened so far report a 0% hit rate.  */
 151         all = 1;
 152
 153       printf (_("\n%s cache:\n\n"
 154                 "%15s  cache is enabled\n"
 155                 "%15Zd  suggested size\n"
 156                 "%15ld  seconds time to live for positive entries\n"
 157                 "%15ld  seconds time to live for negative entries\n"
 158                 "%15ld  cache hits on positive entries\n"
 159                 "%15ld  cache hits on negative entries\n"
 160                 "%15ld  cache misses on positive entries\n"
 161                 "%15ld  cache misses on negative entries\n"
 162                 "%15ld%% cache hit rate\n"
 163                 "%15s  check /etc/%s for changes\n"),
 164               dbnames[i], enabled,
 165               data.dbs[i].module,
 166               data.dbs[i].postimeout, data.dbs[i].negtimeout,
 167               data.dbs[i].poshit, data.dbs[i].neghit,
 168               data.dbs[i].posmiss, data.dbs[i].negmiss,
 169               (100 * hit) / all,
 170               check_file, dbnames[i]);
 171     }
 172
 173   close (fd);
 174
 175   exit (0);
 176 }