examples/perfcounter/perf_writer_util.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  Performance Counter Daemon
   4  *
   5  *  Copyright (C) Marcin Krzysztof Porwit    2005
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include "perf.h"
  23
  24 extern sig_atomic_t keep_running;
  25
  26 void fatal(char *msg)
  27 {
  28   perror(msg);
  29   exit(1);
  30 }
  31
  32 void add_key_raw(TDB_CONTEXT *db, char *keystring, void *databuf, size_t datasize, int flags)
  33 {
  34   TDB_DATA key, data;
  35
  36   key.dptr = keystring;
  37   key.dsize = strlen(keystring);
  38   data.dptr = databuf;
  39   data.dsize = datasize;
  40   fprintf(stderr, "doing insert of [%x] with key [%s] into [%s]\n",
  41           data.dptr,
  42           keystring,
  43           db->name);
  44
  45   tdb_store(db, key, data, flags);
  46 }
  47
  48 void add_key(TDB_CONTEXT *db, char *keystring, char *datastring, int flags)
  49 {
  50   TDB_DATA key, data;
  51
  52   key.dptr = keystring;
  53   key.dsize = strlen(keystring);
  54   data.dptr = datastring;
  55   data.dsize = strlen(datastring);
  56   /*  fprintf(stderr, "doing insert of [%s] with key [%s] into [%s]\n",
  57           data.dptr,
  58           keystring,
  59           db->name);*/
  60
  61   tdb_store(db, key, data, flags);
  62 }
  63
  64 void make_key(char *buf, int buflen, int key_part1, char *key_part2)
  65 {
  66     memset(buf, 0, buflen);
  67     if(key_part2 != NULL)
  68         sprintf(buf, "%d%s", key_part1, key_part2);
  69     else
  70         sprintf(buf, "%d", key_part1);
  71
  72     return;
  73 }
  74
  75 void usage(char *progname)
  76 {
  77     fprintf(stderr, "Usage: %s [-d] [-f <file_path>].\n", progname);
  78     fprintf(stderr, "\t-d: run as a daemon.\n");
  79     fprintf(stderr, "\t-f <file_path>: path where the TDB files reside.\n");
  80     fprintf(stderr, "\t\tDEFAULT is /var/lib/samba/perfmon\n");
  81     exit(1);
  82 }
  83
  84 void parse_flags(RuntimeSettings *rt, int argc, char **argv)
  85 {
  86     int flag;
  87
  88     while((flag = getopt(argc, argv, "df:")) != -1)
  89     {
  90         switch(flag)
  91         {
  92             case 'd':
  93             {
  94                 rt->dflag = TRUE;
  95                 break;
  96             }
  97             case 'f':
  98             {
  99                 memcpy(rt->dbDir, optarg, strlen(optarg));
 100                 break;
 101             }
 102             default:
 103             {
 104                 usage(argv[0]);
 105             }
 106         }
 107     }
 108
 109     return;
 110 }
 111
 112 void setup_file_paths(RuntimeSettings *rt)
 113 {
 114     int status;
 115
 116     if(strlen(rt->dbDir) == 0)
 117     {
 118         /* No file path was passed in, use default */
 119         sprintf(rt->dbDir, "/var/lib/samba/perfmon");
 120     }
 121
 122     sprintf(rt->nameFile, "%s/names.tdb", rt->dbDir);
 123     sprintf(rt->counterFile, "%s/data.tdb", rt->dbDir);
 124
 125     mkdir(rt->dbDir, 0755);
 126     rt->cnames = tdb_open(rt->nameFile, 0, TDB_CLEAR_IF_FIRST, O_RDWR | O_CREAT, 0644);
 127     rt->cdata = tdb_open(rt->counterFile, 0, TDB_CLEAR_IF_FIRST, O_RDWR | O_CREAT, 0644);
 128
 129     if(rt->cnames == NULL || rt->cdata == NULL)
 130     {
 131         perror("setup_file_paths");
 132         exit(1);
 133     }
 134
 135     return;
 136 }
 137
 138 void sigterm_handler()
 139 {
 140     keep_running = FALSE;
 141     return;
 142 }
 143
 144 void daemonize(RuntimeSettings *rt)
 145 {
 146     pid_t pid;
 147     int i;
 148     int fd;
 149
 150     /* Check if we're already a daemon */
 151     if(getppid() == 1)
 152         return;
 153     pid = fork();
 154     if(pid < 0)
 155         /* can't fork */
 156         exit(1);
 157     else if(pid > 0)
 158     {
 159         /* we're the parent */
 160         tdb_close(rt->cnames);
 161         tdb_close(rt->cdata);
 162         exit(0);
 163     }
 164
 165     /* get a new session */
 166     if(setsid() == -1)
 167         exit(2);
 168
 169     /* Change CWD */
 170     chdir("/");
 171
 172     /* close file descriptors */
 173     close(STDIN_FILENO);
 174     close(STDOUT_FILENO);
 175     close(STDERR_FILENO);
 176
 177     /* And reopen them as safe defaults */
 178     fd = open("/dev/null", O_RDONLY);
 179     if(fd != 0)
 180     {
 181         dup2(fd, 0);
 182         close(fd);
 183     }
 184     fd = open("/dev/null", O_WRONLY);
 185     if(fd != 1)
 186     {
 187         dup2(fd, 1);
 188         close(fd);
 189     }
 190     fd = open("/dev/null", O_WRONLY);
 191     if(fd != 2)
 192     {
 193         dup2(fd, 2);
 194         close(fd);
 195     }
 196
 197     /* handle signals */
 198     signal(SIGINT, SIG_IGN);
 199     signal(SIGHUP, SIG_IGN);
 200     signal(SIGTERM, sigterm_handler);
 201
 202     return;
 203 }
 204
 205 int get_counter_id(PERF_DATA_BLOCK *data)
 206 {
 207     data->counter_id += 2;
 208     data->num_counters++;
 209
 210     return data->counter_id;
 211 }
 212
 213 void init_perf_counter(PerfCounter *counter,
 214                        PerfCounter *parent,
 215                        unsigned int index,
 216                        char *name,
 217                        char *help,
 218                        int counter_type,
 219                        int record_type)
 220 {
 221     counter->index = index;
 222     memcpy(counter->name, name, strlen(name));
 223     memcpy(counter->help, help, strlen(help));
 224     counter->counter_type = counter_type;
 225     counter->record_type = record_type;
 226
 227     switch(record_type)
 228     {
 229         case PERF_OBJECT:
 230             sprintf(counter->relationships, "p");
 231             break;
 232         case PERF_COUNTER:
 233             sprintf(counter->relationships, "c[%d]", parent->index);
 234             break;
 235         case PERF_INSTANCE:
 236             sprintf(counter->relationships, "i[%d]", parent->index);
 237             break;
 238         default:
 239             perror("init_perf_counter: unknown record type");
 240             exit(1);
 241     }
 242
 243     return;
 244 }