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annotate libnumdb/refresh.c @ 171:4f1f3f799295

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doc/Codec-library-depend: article written
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 21 Nov 2022 01:01:39 -0800
parents 2cc790b66359
children
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2cc790b66359 libnumdb: implement refresh
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1 /*
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2 * Long-running ThemWi daemon processes need to be able to pick up updates
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3 * to the number database without being restarted. Whenever they need to
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4 * consult the number db when handling a new call setup or equivalent,
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5 * they will call refresh_number_db(), which does a stat on the file,
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6 * followed by a re-read if the file has changed.
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7 */
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8
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9 #include <sys/types.h>
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10 #include <sys/stat.h>
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11 #include <stdio.h>
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12 #include <stdint.h>
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13 #include <stdlib.h>
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14 #include <syslog.h>
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15 #include "../include/number_db_file.h"
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16
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17 extern char numdb_pathname[];
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18 extern struct stat numdb_file_stat;
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19 extern uint64_t *numdb_owned_numbers;
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20 extern struct short_number_map *numdb_short_numbers;
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21
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22 refresh_number_db()
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23 {
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24 int rc;
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25 struct stat st;
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26
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27 rc = stat(numdb_pathname, &st);
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28 if (rc < 0) {
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29 syslog(LOG_CRIT, "unable to stat %s for refresh: %m",
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30 numdb_pathname);
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31 return(-1);
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32 }
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33 if (st.st_mtime == numdb_file_stat.st_mtime &&
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34 st.st_ctime == numdb_file_stat.st_ctime &&
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35 st.st_size == numdb_file_stat.st_size)
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36 return(0);
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37 if (numdb_owned_numbers) {
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38 free(numdb_owned_numbers);
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39 numdb_owned_numbers = 0;
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40 }
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41 if (numdb_short_numbers) {
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42 free(numdb_short_numbers);
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43 numdb_short_numbers = 0;
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44 }
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45 rc = read_number_db();
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46 if (rc < 0) {
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47 syslog(LOG_CRIT, "error reading %s on refresh!",
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48 numdb_pathname);
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49 exit(1);
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50 }
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51 return(1);
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52 }