PostgreSQL Source Code  git master
syslogger.c File Reference
#include "postgres.h"
#include <fcntl.h>
#include <limits.h>
#include <signal.h>
#include <time.h>
#include <unistd.h>
#include <sys/stat.h>
#include "common/file_perm.h"
#include "lib/stringinfo.h"
#include "libpq/pqsignal.h"
#include "miscadmin.h"
#include "nodes/pg_list.h"
#include "pgstat.h"
#include "pgtime.h"
#include "port/pg_bitutils.h"
#include "postmaster/interrupt.h"
#include "postmaster/postmaster.h"
#include "postmaster/syslogger.h"
#include "storage/dsm.h"
#include "storage/fd.h"
#include "storage/ipc.h"
#include "storage/latch.h"
#include "storage/pg_shmem.h"
#include "tcop/tcopprot.h"
#include "utils/guc.h"
#include "utils/memutils.h"
#include "utils/ps_status.h"
Include dependency graph for syslogger.c:

Go to the source code of this file.

Data Structures

struct  save_buffer
 
struct  SysloggerStartupData
 

Macros

#define READ_BUF_SIZE   (2 * PIPE_CHUNK_SIZE)
 
#define LOGROTATE_SIGNAL_FILE   "logrotate"
 
#define NBUFFER_LISTS   256
 

Functions

static void process_pipe_input (char *logbuffer, int *bytes_in_logbuffer)
 
static void flush_pipe_input (char *logbuffer, int *bytes_in_logbuffer)
 
static FILE * logfile_open (const char *filename, const char *mode, bool allow_errors)
 
static void logfile_rotate (bool time_based_rotation, int size_rotation_for)
 
static bool logfile_rotate_dest (bool time_based_rotation, int size_rotation_for, pg_time_t fntime, int target_dest, char **last_file_name, FILE **logFile)
 
static char * logfile_getname (pg_time_t timestamp, const char *suffix)
 
static void set_next_rotation_time (void)
 
static void sigUsr1Handler (SIGNAL_ARGS)
 
static void update_metainfo_datafile (void)
 
void SysLoggerMain (char *startup_data, size_t startup_data_len)
 
int SysLogger_Start (void)
 
void write_syslogger_file (const char *buffer, int count, int destination)
 
bool CheckLogrotateSignal (void)
 
void RemoveLogrotateSignalFiles (void)
 

Variables

bool Logging_collector = false
 
int Log_RotationAge = HOURS_PER_DAY * MINS_PER_HOUR
 
int Log_RotationSize = 10 * 1024
 
char * Log_directory = NULL
 
char * Log_filename = NULL
 
bool Log_truncate_on_rotation = false
 
int Log_file_mode = S_IRUSR | S_IWUSR
 
bool redirection_done
 
static pg_time_t next_rotation_time
 
static bool pipe_eof_seen = false
 
static bool rotation_disabled = false
 
static FILE * syslogFile = NULL
 
static FILE * csvlogFile = NULL
 
static FILE * jsonlogFile = NULL
 
NON_EXEC_STATIC pg_time_t first_syslogger_file_time = 0
 
static char * last_sys_file_name = NULL
 
static char * last_csv_file_name = NULL
 
static char * last_json_file_name = NULL
 
static Listbuffer_lists [NBUFFER_LISTS]
 
int syslogPipe [2] = {-1, -1}
 
static volatile sig_atomic_t rotation_requested = false
 

Macro Definition Documentation

◆ LOGROTATE_SIGNAL_FILE

#define LOGROTATE_SIGNAL_FILE   "logrotate"

Definition at line 63 of file syslogger.c.

◆ NBUFFER_LISTS

#define NBUFFER_LISTS   256

Definition at line 111 of file syslogger.c.

◆ READ_BUF_SIZE

#define READ_BUF_SIZE   (2 * PIPE_CHUNK_SIZE)

Definition at line 60 of file syslogger.c.

Function Documentation

◆ CheckLogrotateSignal()

bool CheckLogrotateSignal ( void  )

Definition at line 1573 of file syslogger.c.

1574 {
1575  struct stat stat_buf;
1576 
1577  if (stat(LOGROTATE_SIGNAL_FILE, &stat_buf) == 0)
1578  return true;
1579 
1580  return false;
1581 }
#define LOGROTATE_SIGNAL_FILE
Definition: syslogger.c:63
#define stat
Definition: win32_port.h:284

References LOGROTATE_SIGNAL_FILE, and stat.

Referenced by process_pm_pmsignal().

◆ flush_pipe_input()

static void flush_pipe_input ( char *  logbuffer,
int *  bytes_in_logbuffer 
)
static

Definition at line 1043 of file syslogger.c.

1044 {
1045  int i;
1046 
1047  /* Dump any incomplete protocol messages */
1048  for (i = 0; i < NBUFFER_LISTS; i++)
1049  {
1050  List *list = buffer_lists[i];
1051  ListCell *cell;
1052 
1053  foreach(cell, list)
1054  {
1055  save_buffer *buf = (save_buffer *) lfirst(cell);
1056 
1057  if (buf->pid != 0)
1058  {
1059  StringInfo str = &(buf->data);
1060 
1061  write_syslogger_file(str->data, str->len,
1063  /* Mark the buffer unused, and reclaim string storage */
1064  buf->pid = 0;
1065  pfree(str->data);
1066  }
1067  }
1068  }
1069 
1070  /*
1071  * Force out any remaining pipe data as-is; we don't bother trying to
1072  * remove any protocol headers that may exist in it.
1073  */
1074  if (*bytes_in_logbuffer > 0)
1075  write_syslogger_file(logbuffer, *bytes_in_logbuffer,
1077  *bytes_in_logbuffer = 0;
1078 }
#define LOG_DESTINATION_STDERR
Definition: elog.h:492
const char * str
int i
Definition: isn.c:73
void pfree(void *pointer)
Definition: mcxt.c:1520
#define lfirst(lc)
Definition: pg_list.h:172
static char * buf
Definition: pg_test_fsync.c:73
Definition: pg_list.h:54
#define NBUFFER_LISTS
Definition: syslogger.c:111
void write_syslogger_file(const char *buffer, int count, int destination)
Definition: syslogger.c:1094
static List * buffer_lists[NBUFFER_LISTS]
Definition: syslogger.c:112

References buf, buffer_lists, i, lfirst, sort-test::list, LOG_DESTINATION_STDERR, NBUFFER_LISTS, pfree(), str, and write_syslogger_file().

Referenced by SysLoggerMain().

◆ logfile_getname()

static char * logfile_getname ( pg_time_t  timestamp,
const char *  suffix 
)
static

Definition at line 1411 of file syslogger.c.

1412 {
1413  char *filename;
1414  int len;
1415 
1417 
1419 
1420  len = strlen(filename);
1421 
1422  /* treat Log_filename as a strftime pattern */
1425 
1426  if (suffix != NULL)
1427  {
1428  len = strlen(filename);
1429  if (len > 4 && (strcmp(filename + (len - 4), ".log") == 0))
1430  len -= 4;
1431  strlcpy(filename + len, suffix, MAXPGPATH - len);
1432  }
1433 
1434  return filename;
1435 }
void * palloc(Size size)
Definition: mcxt.c:1316
#define MAXPGPATH
const void size_t len
static char * filename
Definition: pg_dumpall.c:119
struct pg_tm * pg_localtime(const pg_time_t *timep, const pg_tz *tz)
Definition: localtime.c:1344
size_t pg_strftime(char *s, size_t maxsize, const char *format, const struct pg_tm *t)
Definition: strftime.c:128
PGDLLIMPORT pg_tz * log_timezone
Definition: pgtz.c:31
int64 timestamp
#define snprintf
Definition: port.h:238
size_t strlcpy(char *dst, const char *src, size_t siz)
Definition: strlcpy.c:45
char * Log_directory
Definition: syslogger.c:73
char * Log_filename
Definition: syslogger.c:74

References filename, len, Log_directory, Log_filename, log_timezone, MAXPGPATH, palloc(), pg_localtime(), pg_strftime(), snprintf, and strlcpy().

Referenced by logfile_rotate_dest(), SysLogger_Start(), and SysLoggerMain().

◆ logfile_open()

static FILE * logfile_open ( const char *  filename,
const char *  mode,
bool  allow_errors 
)
static

Definition at line 1218 of file syslogger.c.

1219 {
1220  FILE *fh;
1221  mode_t oumask;
1222 
1223  /*
1224  * Note we do not let Log_file_mode disable IWUSR, since we certainly want
1225  * to be able to write the files ourselves.
1226  */
1227  oumask = umask((mode_t) ((~(Log_file_mode | S_IWUSR)) & (S_IRWXU | S_IRWXG | S_IRWXO)));
1228  fh = fopen(filename, mode);
1229  umask(oumask);
1230 
1231  if (fh)
1232  {
1233  setvbuf(fh, NULL, PG_IOLBF, 0);
1234 
1235 #ifdef WIN32
1236  /* use CRLF line endings on Windows */
1237  _setmode(_fileno(fh), _O_TEXT);
1238 #endif
1239  }
1240  else
1241  {
1242  int save_errno = errno;
1243 
1244  ereport(allow_errors ? LOG : FATAL,
1246  errmsg("could not open log file \"%s\": %m",
1247  filename)));
1248  errno = save_errno;
1249  }
1250 
1251  return fh;
1252 }
int errcode_for_file_access(void)
Definition: elog.c:880
int errmsg(const char *fmt,...)
Definition: elog.c:1070
#define LOG
Definition: elog.h:31
#define FATAL
Definition: elog.h:41
#define ereport(elevel,...)
Definition: elog.h:149
static PgChecksumMode mode
Definition: pg_checksums.c:56
#define PG_IOLBF
Definition: port.h:361
int Log_file_mode
Definition: syslogger.c:76
#define S_IRWXG
Definition: win32_port.h:310
#define S_IRWXO
Definition: win32_port.h:322
#define S_IWUSR
Definition: win32_port.h:292
#define S_IRWXU
Definition: win32_port.h:298

References ereport, errcode_for_file_access(), errmsg(), FATAL, filename, LOG, Log_file_mode, mode, PG_IOLBF, S_IRWXG, S_IRWXO, S_IRWXU, and S_IWUSR.

Referenced by logfile_rotate_dest(), and SysLogger_Start().

◆ logfile_rotate()

static void logfile_rotate ( bool  time_based_rotation,
int  size_rotation_for 
)
static

Definition at line 1362 of file syslogger.c.

1363 {
1364  pg_time_t fntime;
1365 
1366  rotation_requested = false;
1367 
1368  /*
1369  * When doing a time-based rotation, invent the new logfile name based on
1370  * the planned rotation time, not current time, to avoid "slippage" in the
1371  * file name when we don't do the rotation immediately.
1372  */
1373  if (time_based_rotation)
1374  fntime = next_rotation_time;
1375  else
1376  fntime = time(NULL);
1377 
1378  /* file rotation for stderr */
1379  if (!logfile_rotate_dest(time_based_rotation, size_rotation_for, fntime,
1381  &syslogFile))
1382  return;
1383 
1384  /* file rotation for csvlog */
1385  if (!logfile_rotate_dest(time_based_rotation, size_rotation_for, fntime,
1387  &csvlogFile))
1388  return;
1389 
1390  /* file rotation for jsonlog */
1391  if (!logfile_rotate_dest(time_based_rotation, size_rotation_for, fntime,
1393  &jsonlogFile))
1394  return;
1395 
1397 
1399 }
#define LOG_DESTINATION_JSONLOG
Definition: elog.h:496
#define LOG_DESTINATION_CSVLOG
Definition: elog.h:495
int64 pg_time_t
Definition: pgtime.h:23
static bool logfile_rotate_dest(bool time_based_rotation, int size_rotation_for, pg_time_t fntime, int target_dest, char **last_file_name, FILE **logFile)
Definition: syslogger.c:1263
static void update_metainfo_datafile(void)
Definition: syslogger.c:1476
static char * last_csv_file_name
Definition: syslogger.c:91
static FILE * syslogFile
Definition: syslogger.c:86
static pg_time_t next_rotation_time
Definition: syslogger.c:83
static volatile sig_atomic_t rotation_requested
Definition: syslogger.c:129
static FILE * csvlogFile
Definition: syslogger.c:87
static void set_next_rotation_time(void)
Definition: syslogger.c:1441
static FILE * jsonlogFile
Definition: syslogger.c:88
static char * last_json_file_name
Definition: syslogger.c:92
static char * last_sys_file_name
Definition: syslogger.c:90

References csvlogFile, jsonlogFile, last_csv_file_name, last_json_file_name, last_sys_file_name, LOG_DESTINATION_CSVLOG, LOG_DESTINATION_JSONLOG, LOG_DESTINATION_STDERR, logfile_rotate_dest(), next_rotation_time, rotation_requested, set_next_rotation_time(), syslogFile, and update_metainfo_datafile().

Referenced by SysLoggerMain().

◆ logfile_rotate_dest()

static bool logfile_rotate_dest ( bool  time_based_rotation,
int  size_rotation_for,
pg_time_t  fntime,
int  target_dest,
char **  last_file_name,
FILE **  logFile 
)
static

Definition at line 1263 of file syslogger.c.

1266 {
1267  char *logFileExt = NULL;
1268  char *filename;
1269  FILE *fh;
1270 
1271  /*
1272  * If the target destination was just turned off, close the previous file
1273  * and unregister its data. This cannot happen for stderr as syslogFile
1274  * is assumed to be always opened even if stderr is disabled in
1275  * log_destination.
1276  */
1277  if ((Log_destination & target_dest) == 0 &&
1278  target_dest != LOG_DESTINATION_STDERR)
1279  {
1280  if (*logFile != NULL)
1281  fclose(*logFile);
1282  *logFile = NULL;
1283  if (*last_file_name != NULL)
1284  pfree(*last_file_name);
1285  *last_file_name = NULL;
1286  return true;
1287  }
1288 
1289  /*
1290  * Leave if it is not time for a rotation or if the target destination has
1291  * no need to do a rotation based on the size of its file.
1292  */
1293  if (!time_based_rotation && (size_rotation_for & target_dest) == 0)
1294  return true;
1295 
1296  /* file extension depends on the destination type */
1297  if (target_dest == LOG_DESTINATION_STDERR)
1298  logFileExt = NULL;
1299  else if (target_dest == LOG_DESTINATION_CSVLOG)
1300  logFileExt = ".csv";
1301  else if (target_dest == LOG_DESTINATION_JSONLOG)
1302  logFileExt = ".json";
1303  else
1304  {
1305  /* cannot happen */
1306  Assert(false);
1307  }
1308 
1309  /* build the new file name */
1310  filename = logfile_getname(fntime, logFileExt);
1311 
1312  /*
1313  * Decide whether to overwrite or append. We can overwrite if (a)
1314  * Log_truncate_on_rotation is set, (b) the rotation was triggered by
1315  * elapsed time and not something else, and (c) the computed file name is
1316  * different from what we were previously logging into.
1317  */
1318  if (Log_truncate_on_rotation && time_based_rotation &&
1319  *last_file_name != NULL &&
1320  strcmp(filename, *last_file_name) != 0)
1321  fh = logfile_open(filename, "w", true);
1322  else
1323  fh = logfile_open(filename, "a", true);
1324 
1325  if (!fh)
1326  {
1327  /*
1328  * ENFILE/EMFILE are not too surprising on a busy system; just keep
1329  * using the old file till we manage to get a new one. Otherwise,
1330  * assume something's wrong with Log_directory and stop trying to
1331  * create files.
1332  */
1333  if (errno != ENFILE && errno != EMFILE)
1334  {
1335  ereport(LOG,
1336  (errmsg("disabling automatic rotation (use SIGHUP to re-enable)")));
1337  rotation_disabled = true;
1338  }
1339 
1340  if (filename)
1341  pfree(filename);
1342  return false;
1343  }
1344 
1345  /* fill in the new information */
1346  if (*logFile != NULL)
1347  fclose(*logFile);
1348  *logFile = fh;
1349 
1350  /* instead of pfree'ing filename, remember it for next time */
1351  if (*last_file_name != NULL)
1352  pfree(*last_file_name);
1353  *last_file_name = filename;
1354 
1355  return true;
1356 }
#define Assert(condition)
Definition: c.h:858
int Log_destination
Definition: elog.c:112
bool Log_truncate_on_rotation
Definition: syslogger.c:75
static bool rotation_disabled
Definition: syslogger.c:85
static char * logfile_getname(pg_time_t timestamp, const char *suffix)
Definition: syslogger.c:1411
static FILE * logfile_open(const char *filename, const char *mode, bool allow_errors)
Definition: syslogger.c:1218

References Assert, ereport, errmsg(), filename, LOG, Log_destination, LOG_DESTINATION_CSVLOG, LOG_DESTINATION_JSONLOG, LOG_DESTINATION_STDERR, Log_truncate_on_rotation, logfile_getname(), logfile_open(), pfree(), and rotation_disabled.

Referenced by logfile_rotate().

◆ process_pipe_input()

static void process_pipe_input ( char *  logbuffer,
int *  bytes_in_logbuffer 
)
static

Definition at line 880 of file syslogger.c.

881 {
882  char *cursor = logbuffer;
883  int count = *bytes_in_logbuffer;
885 
886  /* While we have enough for a header, process data... */
887  while (count >= (int) (offsetof(PipeProtoHeader, data) + 1))
888  {
889  PipeProtoHeader p;
890  int chunklen;
891  bits8 dest_flags;
892 
893  /* Do we have a valid header? */
894  memcpy(&p, cursor, offsetof(PipeProtoHeader, data));
895  dest_flags = p.flags & (PIPE_PROTO_DEST_STDERR |
898  if (p.nuls[0] == '\0' && p.nuls[1] == '\0' &&
899  p.len > 0 && p.len <= PIPE_MAX_PAYLOAD &&
900  p.pid != 0 &&
901  pg_number_of_ones[dest_flags] == 1)
902  {
903  List *buffer_list;
904  ListCell *cell;
905  save_buffer *existing_slot = NULL,
906  *free_slot = NULL;
907  StringInfo str;
908 
909  chunklen = PIPE_HEADER_SIZE + p.len;
910 
911  /* Fall out of loop if we don't have the whole chunk yet */
912  if (count < chunklen)
913  break;
914 
915  if ((p.flags & PIPE_PROTO_DEST_STDERR) != 0)
917  else if ((p.flags & PIPE_PROTO_DEST_CSVLOG) != 0)
919  else if ((p.flags & PIPE_PROTO_DEST_JSONLOG) != 0)
921  else
922  {
923  /* this should never happen as of the header validation */
924  Assert(false);
925  }
926 
927  /* Locate any existing buffer for this source pid */
928  buffer_list = buffer_lists[p.pid % NBUFFER_LISTS];
929  foreach(cell, buffer_list)
930  {
931  save_buffer *buf = (save_buffer *) lfirst(cell);
932 
933  if (buf->pid == p.pid)
934  {
935  existing_slot = buf;
936  break;
937  }
938  if (buf->pid == 0 && free_slot == NULL)
939  free_slot = buf;
940  }
941 
942  if ((p.flags & PIPE_PROTO_IS_LAST) == 0)
943  {
944  /*
945  * Save a complete non-final chunk in a per-pid buffer
946  */
947  if (existing_slot != NULL)
948  {
949  /* Add chunk to data from preceding chunks */
950  str = &(existing_slot->data);
953  p.len);
954  }
955  else
956  {
957  /* First chunk of message, save in a new buffer */
958  if (free_slot == NULL)
959  {
960  /*
961  * Need a free slot, but there isn't one in the list,
962  * so create a new one and extend the list with it.
963  */
964  free_slot = palloc(sizeof(save_buffer));
965  buffer_list = lappend(buffer_list, free_slot);
966  buffer_lists[p.pid % NBUFFER_LISTS] = buffer_list;
967  }
968  free_slot->pid = p.pid;
969  str = &(free_slot->data);
973  p.len);
974  }
975  }
976  else
977  {
978  /*
979  * Final chunk --- add it to anything saved for that pid, and
980  * either way write the whole thing out.
981  */
982  if (existing_slot != NULL)
983  {
984  str = &(existing_slot->data);
987  p.len);
988  write_syslogger_file(str->data, str->len, dest);
989  /* Mark the buffer unused, and reclaim string storage */
990  existing_slot->pid = 0;
991  pfree(str->data);
992  }
993  else
994  {
995  /* The whole message was one chunk, evidently. */
997  dest);
998  }
999  }
1000 
1001  /* Finished processing this chunk */
1002  cursor += chunklen;
1003  count -= chunklen;
1004  }
1005  else
1006  {
1007  /* Process non-protocol data */
1008 
1009  /*
1010  * Look for the start of a protocol header. If found, dump data
1011  * up to there and repeat the loop. Otherwise, dump it all and
1012  * fall out of the loop. (Note: we want to dump it all if at all
1013  * possible, so as to avoid dividing non-protocol messages across
1014  * logfiles. We expect that in many scenarios, a non-protocol
1015  * message will arrive all in one read(), and we want to respect
1016  * the read() boundary if possible.)
1017  */
1018  for (chunklen = 1; chunklen < count; chunklen++)
1019  {
1020  if (cursor[chunklen] == '\0')
1021  break;
1022  }
1023  /* fall back on the stderr log as the destination */
1025  cursor += chunklen;
1026  count -= chunklen;
1027  }
1028  }
1029 
1030  /* We don't have a full chunk, so left-align what remains in the buffer */
1031  if (count > 0 && cursor != logbuffer)
1032  memmove(logbuffer, cursor, count);
1033  *bytes_in_logbuffer = count;
1034 }
uint8 bits8
Definition: c.h:513
List * lappend(List *list, void *datum)
Definition: list.c:339
PGDLLIMPORT const uint8 pg_number_of_ones[256]
Definition: pg_bitutils.c:87
const void * data
void appendBinaryStringInfo(StringInfo str, const void *data, int datalen)
Definition: stringinfo.c:233
void initStringInfo(StringInfo str)
Definition: stringinfo.c:59
char nuls[2]
Definition: syslogger.h:46
Definition: type.h:137
StringInfoData data
Definition: syslogger.c:108
int32 pid
Definition: syslogger.c:107
#define PIPE_PROTO_DEST_JSONLOG
Definition: syslogger.h:67
#define PIPE_PROTO_IS_LAST
Definition: syslogger.h:63
#define PIPE_PROTO_DEST_CSVLOG
Definition: syslogger.h:66
#define PIPE_PROTO_DEST_STDERR
Definition: syslogger.h:65
#define PIPE_MAX_PAYLOAD
Definition: syslogger.h:60
#define PIPE_HEADER_SIZE
Definition: syslogger.h:59

References appendBinaryStringInfo(), Assert, buf, buffer_lists, save_buffer::data, data, generate_unaccent_rules::dest, PipeProtoHeader::flags, initStringInfo(), lappend(), PipeProtoHeader::len, lfirst, LOG_DESTINATION_CSVLOG, LOG_DESTINATION_JSONLOG, LOG_DESTINATION_STDERR, NBUFFER_LISTS, PipeProtoHeader::nuls, palloc(), pfree(), pg_number_of_ones, save_buffer::pid, PipeProtoHeader::pid, PIPE_HEADER_SIZE, PIPE_MAX_PAYLOAD, PIPE_PROTO_DEST_CSVLOG, PIPE_PROTO_DEST_JSONLOG, PIPE_PROTO_DEST_STDERR, PIPE_PROTO_IS_LAST, str, and write_syslogger_file().

Referenced by SysLoggerMain().

◆ RemoveLogrotateSignalFiles()

void RemoveLogrotateSignalFiles ( void  )

Definition at line 1587 of file syslogger.c.

1588 {
1589  unlink(LOGROTATE_SIGNAL_FILE);
1590 }

References LOGROTATE_SIGNAL_FILE.

Referenced by PostmasterMain(), and process_pm_pmsignal().

◆ set_next_rotation_time()

static void set_next_rotation_time ( void  )
static

Definition at line 1441 of file syslogger.c.

1442 {
1443  pg_time_t now;
1444  struct pg_tm *tm;
1445  int rotinterval;
1446 
1447  /* nothing to do if time-based rotation is disabled */
1448  if (Log_RotationAge <= 0)
1449  return;
1450 
1451  /*
1452  * The requirements here are to choose the next time > now that is a
1453  * "multiple" of the log rotation interval. "Multiple" can be interpreted
1454  * fairly loosely. In this version we align to log_timezone rather than
1455  * GMT.
1456  */
1457  rotinterval = Log_RotationAge * SECS_PER_MINUTE; /* convert to seconds */
1458  now = (pg_time_t) time(NULL);
1460  now += tm->tm_gmtoff;
1461  now -= now % rotinterval;
1462  now += rotinterval;
1463  now -= tm->tm_gmtoff;
1465 }
Datum now(PG_FUNCTION_ARGS)
Definition: timestamp.c:1618
#define SECS_PER_MINUTE
Definition: timestamp.h:128
static struct pg_tm tm
Definition: localtime.c:104
Definition: pgtime.h:35
long int tm_gmtoff
Definition: pgtime.h:45
int Log_RotationAge
Definition: syslogger.c:71

References Log_RotationAge, log_timezone, next_rotation_time, now(), pg_localtime(), SECS_PER_MINUTE, tm, and pg_tm::tm_gmtoff.

Referenced by logfile_rotate(), and SysLoggerMain().

◆ sigUsr1Handler()

static void sigUsr1Handler ( SIGNAL_ARGS  )
static

Definition at line 1594 of file syslogger.c.

1595 {
1596  rotation_requested = true;
1597  SetLatch(MyLatch);
1598 }
struct Latch * MyLatch
Definition: globals.c:60
void SetLatch(Latch *latch)
Definition: latch.c:632

References MyLatch, rotation_requested, and SetLatch().

Referenced by SysLoggerMain().

◆ SysLogger_Start()

int SysLogger_Start ( void  )

Definition at line 595 of file syslogger.c.

596 {
597  pid_t sysloggerPid;
598  char *filename;
599 #ifdef EXEC_BACKEND
600  SysloggerStartupData startup_data;
601 #endif /* EXEC_BACKEND */
602 
603  if (!Logging_collector)
604  return 0;
605 
606  /*
607  * If first time through, create the pipe which will receive stderr
608  * output.
609  *
610  * If the syslogger crashes and needs to be restarted, we continue to use
611  * the same pipe (indeed must do so, since extant backends will be writing
612  * into that pipe).
613  *
614  * This means the postmaster must continue to hold the read end of the
615  * pipe open, so we can pass it down to the reincarnated syslogger. This
616  * is a bit klugy but we have little choice.
617  *
618  * Also note that we don't bother counting the pipe FDs by calling
619  * Reserve/ReleaseExternalFD. There's no real need to account for them
620  * accurately in the postmaster or syslogger process, and both ends of the
621  * pipe will wind up closed in all other postmaster children.
622  */
623 #ifndef WIN32
624  if (syslogPipe[0] < 0)
625  {
626  if (pipe(syslogPipe) < 0)
627  ereport(FATAL,
629  errmsg("could not create pipe for syslog: %m")));
630  }
631 #else
632  if (!syslogPipe[0])
633  {
634  SECURITY_ATTRIBUTES sa;
635 
636  memset(&sa, 0, sizeof(SECURITY_ATTRIBUTES));
637  sa.nLength = sizeof(SECURITY_ATTRIBUTES);
638  sa.bInheritHandle = TRUE;
639 
640  if (!CreatePipe(&syslogPipe[0], &syslogPipe[1], &sa, 32768))
641  ereport(FATAL,
643  errmsg("could not create pipe for syslog: %m")));
644  }
645 #endif
646 
647  /*
648  * Create log directory if not present; ignore errors
649  */
651 
652  /*
653  * The initial logfile is created right in the postmaster, to verify that
654  * the Log_directory is writable. We save the reference time so that the
655  * syslogger child process can recompute this file name.
656  *
657  * It might look a bit strange to re-do this during a syslogger restart,
658  * but we must do so since the postmaster closed syslogFile after the
659  * previous fork (and remembering that old file wouldn't be right anyway).
660  * Note we always append here, we won't overwrite any existing file. This
661  * is consistent with the normal rules, because by definition this is not
662  * a time-based rotation.
663  */
664  first_syslogger_file_time = time(NULL);
665 
667 
668  syslogFile = logfile_open(filename, "a", false);
669 
670  pfree(filename);
671 
672  /*
673  * Likewise for the initial CSV log file, if that's enabled. (Note that
674  * we open syslogFile even when only CSV output is nominally enabled,
675  * since some code paths will write to syslogFile anyway.)
676  */
678  {
680 
681  csvlogFile = logfile_open(filename, "a", false);
682 
683  pfree(filename);
684  }
685 
686  /*
687  * Likewise for the initial JSON log file, if that's enabled. (Note that
688  * we open syslogFile even when only JSON output is nominally enabled,
689  * since some code paths will write to syslogFile anyway.)
690  */
692  {
694 
695  jsonlogFile = logfile_open(filename, "a", false);
696 
697  pfree(filename);
698  }
699 
700 #ifdef EXEC_BACKEND
701  startup_data.syslogFile = syslogger_fdget(syslogFile);
702  startup_data.csvlogFile = syslogger_fdget(csvlogFile);
703  startup_data.jsonlogFile = syslogger_fdget(jsonlogFile);
704  sysloggerPid = postmaster_child_launch(B_LOGGER, (char *) &startup_data, sizeof(startup_data), NULL);
705 #else
706  sysloggerPid = postmaster_child_launch(B_LOGGER, NULL, 0, NULL);
707 #endif /* EXEC_BACKEND */
708 
709  if (sysloggerPid == -1)
710  {
711  ereport(LOG,
712  (errmsg("could not fork system logger: %m")));
713  return 0;
714  }
715 
716  /* success, in postmaster */
717 
718  /* now we redirect stderr, if not done already */
719  if (!redirection_done)
720  {
721 #ifdef WIN32
722  int fd;
723 #endif
724 
725  /*
726  * Leave a breadcrumb trail when redirecting, in case the user forgets
727  * that redirection is active and looks only at the original stderr
728  * target file.
729  */
730  ereport(LOG,
731  (errmsg("redirecting log output to logging collector process"),
732  errhint("Future log output will appear in directory \"%s\".",
733  Log_directory)));
734 
735 #ifndef WIN32
736  fflush(stdout);
737  if (dup2(syslogPipe[1], STDOUT_FILENO) < 0)
738  ereport(FATAL,
740  errmsg("could not redirect stdout: %m")));
741  fflush(stderr);
742  if (dup2(syslogPipe[1], STDERR_FILENO) < 0)
743  ereport(FATAL,
745  errmsg("could not redirect stderr: %m")));
746  /* Now we are done with the write end of the pipe. */
747  close(syslogPipe[1]);
748  syslogPipe[1] = -1;
749 #else
750 
751  /*
752  * open the pipe in binary mode and make sure stderr is binary after
753  * it's been dup'ed into, to avoid disturbing the pipe chunking
754  * protocol.
755  */
756  fflush(stderr);
757  fd = _open_osfhandle((intptr_t) syslogPipe[1],
758  _O_APPEND | _O_BINARY);
759  if (dup2(fd, STDERR_FILENO) < 0)
760  ereport(FATAL,
762  errmsg("could not redirect stderr: %m")));
763  close(fd);
764  _setmode(STDERR_FILENO, _O_BINARY);
765 
766  /*
767  * Now we are done with the write end of the pipe. CloseHandle() must
768  * not be called because the preceding close() closes the underlying
769  * handle.
770  */
771  syslogPipe[1] = 0;
772 #endif
773  redirection_done = true;
774  }
775 
776  /* postmaster will never write the file(s); close 'em */
777  fclose(syslogFile);
778  syslogFile = NULL;
779  if (csvlogFile != NULL)
780  {
781  fclose(csvlogFile);
782  csvlogFile = NULL;
783  }
784  if (jsonlogFile != NULL)
785  {
786  fclose(jsonlogFile);
787  jsonlogFile = NULL;
788  }
789  return (int) sysloggerPid;
790 }
int errcode_for_socket_access(void)
Definition: elog.c:953
int errhint(const char *fmt,...)
Definition: elog.c:1317
int MakePGDirectory(const char *directoryName)
Definition: fd.c:3913
#define close(a)
Definition: win32.h:12
pid_t postmaster_child_launch(BackendType child_type, char *startup_data, size_t startup_data_len, ClientSocket *client_sock)
static void const char fflush(stdout)
@ B_LOGGER
Definition: miscadmin.h:367
static int fd(const char *x, int i)
Definition: preproc-init.c:105
bool redirection_done
Definition: postmaster.c:353
NON_EXEC_STATIC pg_time_t first_syslogger_file_time
Definition: syslogger.c:89
int syslogPipe[2]
Definition: syslogger.c:116
bool Logging_collector
Definition: syslogger.c:70
#define STDOUT_FILENO
Definition: unistd.h:8
#define STDERR_FILENO
Definition: unistd.h:9

References B_LOGGER, close, csvlogFile, SysloggerStartupData::csvlogFile, ereport, errcode_for_file_access(), errcode_for_socket_access(), errhint(), errmsg(), FATAL, fd(), fflush(), filename, first_syslogger_file_time, jsonlogFile, SysloggerStartupData::jsonlogFile, LOG, Log_destination, LOG_DESTINATION_CSVLOG, LOG_DESTINATION_JSONLOG, Log_directory, logfile_getname(), logfile_open(), Logging_collector, MakePGDirectory(), pfree(), postmaster_child_launch(), redirection_done, STDERR_FILENO, generate_unaccent_rules::stdout, STDOUT_FILENO, syslogFile, SysloggerStartupData::syslogFile, and syslogPipe.

Referenced by PostmasterMain(), process_pm_child_exit(), and ServerLoop().

◆ SysLoggerMain()

void SysLoggerMain ( char *  startup_data,
size_t  startup_data_len 
)

Definition at line 167 of file syslogger.c.

168 {
169 #ifndef WIN32
170  char logbuffer[READ_BUF_SIZE];
171  int bytes_in_logbuffer = 0;
172 #endif
173  char *currentLogDir;
174  char *currentLogFilename;
175  int currentLogRotationAge;
176  pg_time_t now;
177  WaitEventSet *wes;
178 
179  /*
180  * Re-open the error output files that were opened by SysLogger_Start().
181  *
182  * We expect this will always succeed, which is too optimistic, but if it
183  * fails there's not a lot we can do to report the problem anyway. As
184  * coded, we'll just crash on a null pointer dereference after failure...
185  */
186 #ifdef EXEC_BACKEND
187  {
188  SysloggerStartupData *slsdata = (SysloggerStartupData *) startup_data;
189 
190  Assert(startup_data_len == sizeof(*slsdata));
191  syslogFile = syslogger_fdopen(slsdata->syslogFile);
192  csvlogFile = syslogger_fdopen(slsdata->csvlogFile);
193  jsonlogFile = syslogger_fdopen(slsdata->jsonlogFile);
194  }
195 #else
196  Assert(startup_data_len == 0);
197 #endif
198 
199  /*
200  * Now that we're done reading the startup data, release postmaster's
201  * working memory context.
202  */
203  if (PostmasterContext)
204  {
206  PostmasterContext = NULL;
207  }
208 
209  now = MyStartTime;
210 
212  init_ps_display(NULL);
213 
214  /*
215  * If we restarted, our stderr is already redirected into our own input
216  * pipe. This is of course pretty useless, not to mention that it
217  * interferes with detecting pipe EOF. Point stderr to /dev/null. This
218  * assumes that all interesting messages generated in the syslogger will
219  * come through elog.c and will be sent to write_syslogger_file.
220  */
221  if (redirection_done)
222  {
223  int fd = open(DEVNULL, O_WRONLY, 0);
224 
225  /*
226  * The closes might look redundant, but they are not: we want to be
227  * darn sure the pipe gets closed even if the open failed. We can
228  * survive running with stderr pointing nowhere, but we can't afford
229  * to have extra pipe input descriptors hanging around.
230  *
231  * As we're just trying to reset these to go to DEVNULL, there's not
232  * much point in checking for failure from the close/dup2 calls here,
233  * if they fail then presumably the file descriptors are closed and
234  * any writes will go into the bitbucket anyway.
235  */
238  if (fd != -1)
239  {
240  (void) dup2(fd, STDOUT_FILENO);
241  (void) dup2(fd, STDERR_FILENO);
242  close(fd);
243  }
244  }
245 
246  /*
247  * Syslogger's own stderr can't be the syslogPipe, so set it back to text
248  * mode if we didn't just close it. (It was set to binary in
249  * SubPostmasterMain).
250  */
251 #ifdef WIN32
252  else
253  _setmode(STDERR_FILENO, _O_TEXT);
254 #endif
255 
256  /*
257  * Also close our copy of the write end of the pipe. This is needed to
258  * ensure we can detect pipe EOF correctly. (But note that in the restart
259  * case, the postmaster already did this.)
260  */
261 #ifndef WIN32
262  if (syslogPipe[1] >= 0)
263  close(syslogPipe[1]);
264  syslogPipe[1] = -1;
265 #else
266  if (syslogPipe[1])
267  CloseHandle(syslogPipe[1]);
268  syslogPipe[1] = 0;
269 #endif
270 
271  /*
272  * Properly accept or ignore signals the postmaster might send us
273  *
274  * Note: we ignore all termination signals, and instead exit only when all
275  * upstream processes are gone, to ensure we don't miss any dying gasps of
276  * broken backends...
277  */
278 
279  pqsignal(SIGHUP, SignalHandlerForConfigReload); /* set flag to read config
280  * file */
281  pqsignal(SIGINT, SIG_IGN);
282  pqsignal(SIGTERM, SIG_IGN);
286  pqsignal(SIGUSR1, sigUsr1Handler); /* request log rotation */
288 
289  /*
290  * Reset some signals that are accepted by postmaster but not here
291  */
293 
294  sigprocmask(SIG_SETMASK, &UnBlockSig, NULL);
295 
296 #ifdef WIN32
297  /* Fire up separate data transfer thread */
298  InitializeCriticalSection(&sysloggerSection);
299  EnterCriticalSection(&sysloggerSection);
300 
301  threadHandle = (HANDLE) _beginthreadex(NULL, 0, pipeThread, NULL, 0, NULL);
302  if (threadHandle == 0)
303  elog(FATAL, "could not create syslogger data transfer thread: %m");
304 #endif /* WIN32 */
305 
306  /*
307  * Remember active logfiles' name(s). We recompute 'em from the reference
308  * time because passing down just the pg_time_t is a lot cheaper than
309  * passing a whole file path in the EXEC_BACKEND case.
310  */
312  if (csvlogFile != NULL)
314  if (jsonlogFile != NULL)
316 
317  /* remember active logfile parameters */
318  currentLogDir = pstrdup(Log_directory);
319  currentLogFilename = pstrdup(Log_filename);
320  currentLogRotationAge = Log_RotationAge;
321  /* set next planned rotation time */
324 
325  /*
326  * Reset whereToSendOutput, as the postmaster will do (but hasn't yet, at
327  * the point where we forked). This prevents duplicate output of messages
328  * from syslogger itself.
329  */
331 
332  /*
333  * Set up a reusable WaitEventSet object we'll use to wait for our latch,
334  * and (except on Windows) our socket.
335  *
336  * Unlike all other postmaster child processes, we'll ignore postmaster
337  * death because we want to collect final log output from all backends and
338  * then exit last. We'll do that by running until we see EOF on the
339  * syslog pipe, which implies that all other backends have exited
340  * (including the postmaster).
341  */
342  wes = CreateWaitEventSet(NULL, 2);
344 #ifndef WIN32
345  AddWaitEventToSet(wes, WL_SOCKET_READABLE, syslogPipe[0], NULL, NULL);
346 #endif
347 
348  /* main worker loop */
349  for (;;)
350  {
351  bool time_based_rotation = false;
352  int size_rotation_for = 0;
353  long cur_timeout;
354  WaitEvent event;
355 
356 #ifndef WIN32
357  int rc;
358 #endif
359 
360  /* Clear any already-pending wakeups */
362 
363  /*
364  * Process any requests or signals received recently.
365  */
367  {
368  ConfigReloadPending = false;
370 
371  /*
372  * Check if the log directory or filename pattern changed in
373  * postgresql.conf. If so, force rotation to make sure we're
374  * writing the logfiles in the right place.
375  */
376  if (strcmp(Log_directory, currentLogDir) != 0)
377  {
378  pfree(currentLogDir);
379  currentLogDir = pstrdup(Log_directory);
380  rotation_requested = true;
381 
382  /*
383  * Also, create new directory if not present; ignore errors
384  */
386  }
387  if (strcmp(Log_filename, currentLogFilename) != 0)
388  {
389  pfree(currentLogFilename);
390  currentLogFilename = pstrdup(Log_filename);
391  rotation_requested = true;
392  }
393 
394  /*
395  * Force a rotation if CSVLOG output was just turned on or off and
396  * we need to open or close csvlogFile accordingly.
397  */
398  if (((Log_destination & LOG_DESTINATION_CSVLOG) != 0) !=
399  (csvlogFile != NULL))
400  rotation_requested = true;
401 
402  /*
403  * Force a rotation if JSONLOG output was just turned on or off
404  * and we need to open or close jsonlogFile accordingly.
405  */
406  if (((Log_destination & LOG_DESTINATION_JSONLOG) != 0) !=
407  (jsonlogFile != NULL))
408  rotation_requested = true;
409 
410  /*
411  * If rotation time parameter changed, reset next rotation time,
412  * but don't immediately force a rotation.
413  */
414  if (currentLogRotationAge != Log_RotationAge)
415  {
416  currentLogRotationAge = Log_RotationAge;
418  }
419 
420  /*
421  * If we had a rotation-disabling failure, re-enable rotation
422  * attempts after SIGHUP, and force one immediately.
423  */
424  if (rotation_disabled)
425  {
426  rotation_disabled = false;
427  rotation_requested = true;
428  }
429 
430  /*
431  * Force rewriting last log filename when reloading configuration.
432  * Even if rotation_requested is false, log_destination may have
433  * been changed and we don't want to wait the next file rotation.
434  */
436  }
437 
439  {
440  /* Do a logfile rotation if it's time */
441  now = (pg_time_t) time(NULL);
442  if (now >= next_rotation_time)
443  rotation_requested = time_based_rotation = true;
444  }
445 
447  {
448  /* Do a rotation if file is too big */
449  if (ftell(syslogFile) >= Log_RotationSize * 1024L)
450  {
451  rotation_requested = true;
452  size_rotation_for |= LOG_DESTINATION_STDERR;
453  }
454  if (csvlogFile != NULL &&
455  ftell(csvlogFile) >= Log_RotationSize * 1024L)
456  {
457  rotation_requested = true;
458  size_rotation_for |= LOG_DESTINATION_CSVLOG;
459  }
460  if (jsonlogFile != NULL &&
461  ftell(jsonlogFile) >= Log_RotationSize * 1024L)
462  {
463  rotation_requested = true;
464  size_rotation_for |= LOG_DESTINATION_JSONLOG;
465  }
466  }
467 
468  if (rotation_requested)
469  {
470  /*
471  * Force rotation when both values are zero. It means the request
472  * was sent by pg_rotate_logfile() or "pg_ctl logrotate".
473  */
474  if (!time_based_rotation && size_rotation_for == 0)
475  size_rotation_for = LOG_DESTINATION_STDERR |
478  logfile_rotate(time_based_rotation, size_rotation_for);
479  }
480 
481  /*
482  * Calculate time till next time-based rotation, so that we don't
483  * sleep longer than that. We assume the value of "now" obtained
484  * above is still close enough. Note we can't make this calculation
485  * until after calling logfile_rotate(), since it will advance
486  * next_rotation_time.
487  *
488  * Also note that we need to beware of overflow in calculation of the
489  * timeout: with large settings of Log_RotationAge, next_rotation_time
490  * could be more than INT_MAX msec in the future. In that case we'll
491  * wait no more than INT_MAX msec, and try again.
492  */
494  {
495  pg_time_t delay;
496 
497  delay = next_rotation_time - now;
498  if (delay > 0)
499  {
500  if (delay > INT_MAX / 1000)
501  delay = INT_MAX / 1000;
502  cur_timeout = delay * 1000L; /* msec */
503  }
504  else
505  cur_timeout = 0;
506  }
507  else
508  cur_timeout = -1L;
509 
510  /*
511  * Sleep until there's something to do
512  */
513 #ifndef WIN32
514  rc = WaitEventSetWait(wes, cur_timeout, &event, 1,
515  WAIT_EVENT_SYSLOGGER_MAIN);
516 
517  if (rc == 1 && event.events == WL_SOCKET_READABLE)
518  {
519  int bytesRead;
520 
521  bytesRead = read(syslogPipe[0],
522  logbuffer + bytes_in_logbuffer,
523  sizeof(logbuffer) - bytes_in_logbuffer);
524  if (bytesRead < 0)
525  {
526  if (errno != EINTR)
527  ereport(LOG,
529  errmsg("could not read from logger pipe: %m")));
530  }
531  else if (bytesRead > 0)
532  {
533  bytes_in_logbuffer += bytesRead;
534  process_pipe_input(logbuffer, &bytes_in_logbuffer);
535  continue;
536  }
537  else
538  {
539  /*
540  * Zero bytes read when select() is saying read-ready means
541  * EOF on the pipe: that is, there are no longer any processes
542  * with the pipe write end open. Therefore, the postmaster
543  * and all backends are shut down, and we are done.
544  */
545  pipe_eof_seen = true;
546 
547  /* if there's any data left then force it out now */
548  flush_pipe_input(logbuffer, &bytes_in_logbuffer);
549  }
550  }
551 #else /* WIN32 */
552 
553  /*
554  * On Windows we leave it to a separate thread to transfer data and
555  * detect pipe EOF. The main thread just wakes up to handle SIGHUP
556  * and rotation conditions.
557  *
558  * Server code isn't generally thread-safe, so we ensure that only one
559  * of the threads is active at a time by entering the critical section
560  * whenever we're not sleeping.
561  */
562  LeaveCriticalSection(&sysloggerSection);
563 
564  (void) WaitEventSetWait(wes, cur_timeout, &event, 1,
565  WAIT_EVENT_SYSLOGGER_MAIN);
566 
567  EnterCriticalSection(&sysloggerSection);
568 #endif /* WIN32 */
569 
570  if (pipe_eof_seen)
571  {
572  /*
573  * seeing this message on the real stderr is annoying - so we make
574  * it DEBUG1 to suppress in normal use.
575  */
576  ereport(DEBUG1,
577  (errmsg_internal("logger shutting down")));
578 
579  /*
580  * Normal exit from the syslogger is here. Note that we
581  * deliberately do not close syslogFile before exiting; this is to
582  * allow for the possibility of elog messages being generated
583  * inside proc_exit. Regular exit() will take care of flushing
584  * and closing stdio channels.
585  */
586  proc_exit(0);
587  }
588  }
589 }
sigset_t UnBlockSig
Definition: pqsignal.c:22
@ DestNone
Definition: dest.h:87
int errmsg_internal(const char *fmt,...)
Definition: elog.c:1157
#define DEBUG1
Definition: elog.h:30
#define elog(elevel,...)
Definition: elog.h:224
pg_time_t MyStartTime
Definition: globals.c:46
@ PGC_SIGHUP
Definition: guc.h:71
void ProcessConfigFile(GucContext context)
#define read(a, b, c)
Definition: win32.h:13
volatile sig_atomic_t ConfigReloadPending
Definition: interrupt.c:27
void SignalHandlerForConfigReload(SIGNAL_ARGS)
Definition: interrupt.c:61
void proc_exit(int code)
Definition: ipc.c:104
WaitEventSet * CreateWaitEventSet(ResourceOwner resowner, int nevents)
Definition: latch.c:751
int AddWaitEventToSet(WaitEventSet *set, uint32 events, pgsocket fd, Latch *latch, void *user_data)
Definition: latch.c:963
int WaitEventSetWait(WaitEventSet *set, long timeout, WaitEvent *occurred_events, int nevents, uint32 wait_event_info)
Definition: latch.c:1424
void ResetLatch(Latch *latch)
Definition: latch.c:724
#define WL_SOCKET_READABLE
Definition: latch.h:128
#define WL_LATCH_SET
Definition: latch.h:127
char * pstrdup(const char *in)
Definition: mcxt.c:1695
MemoryContext PostmasterContext
Definition: mcxt.c:151
void MemoryContextDelete(MemoryContext context)
Definition: mcxt.c:454
BackendType MyBackendType
Definition: miscinit.c:63
pqsigfunc pqsignal(int signo, pqsigfunc func)
#define DEVNULL
Definition: port.h:160
#define PGINVALID_SOCKET
Definition: port.h:31
CommandDest whereToSendOutput
Definition: postgres.c:90
void init_ps_display(const char *fixed_part)
Definition: ps_status.c:267
uint32 events
Definition: latch.h:155
static void logfile_rotate(bool time_based_rotation, int size_rotation_for)
Definition: syslogger.c:1362
static bool pipe_eof_seen
Definition: syslogger.c:84
#define READ_BUF_SIZE
Definition: syslogger.c:60
static void process_pipe_input(char *logbuffer, int *bytes_in_logbuffer)
Definition: syslogger.c:880
int Log_RotationSize
Definition: syslogger.c:72
static void sigUsr1Handler(SIGNAL_ARGS)
Definition: syslogger.c:1594
static void flush_pipe_input(char *logbuffer, int *bytes_in_logbuffer)
Definition: syslogger.c:1043
#define SIGCHLD
Definition: win32_port.h:178
#define SIGHUP
Definition: win32_port.h:168
#define SIG_DFL
Definition: win32_port.h:163
#define EINTR
Definition: win32_port.h:374
#define SIGPIPE
Definition: win32_port.h:173
#define SIGQUIT
Definition: win32_port.h:169
#define SIGUSR1
Definition: win32_port.h:180
#define SIGALRM
Definition: win32_port.h:174
#define SIGUSR2
Definition: win32_port.h:181
#define SIG_IGN
Definition: win32_port.h:165

References AddWaitEventToSet(), Assert, B_LOGGER, close, ConfigReloadPending, CreateWaitEventSet(), csvlogFile, SysloggerStartupData::csvlogFile, DEBUG1, DestNone, DEVNULL, EINTR, elog, ereport, errcode_for_socket_access(), errmsg(), errmsg_internal(), WaitEvent::events, FATAL, fd(), first_syslogger_file_time, flush_pipe_input(), init_ps_display(), jsonlogFile, SysloggerStartupData::jsonlogFile, last_csv_file_name, last_json_file_name, last_sys_file_name, LOG, Log_destination, LOG_DESTINATION_CSVLOG, LOG_DESTINATION_JSONLOG, LOG_DESTINATION_STDERR, Log_directory, Log_filename, Log_RotationAge, Log_RotationSize, logfile_getname(), logfile_rotate(), MakePGDirectory(), MemoryContextDelete(), MyBackendType, MyLatch, MyStartTime, next_rotation_time, now(), pfree(), PGC_SIGHUP, PGINVALID_SOCKET, pipe_eof_seen, PostmasterContext, pqsignal(), proc_exit(), process_pipe_input(), ProcessConfigFile(), pstrdup(), read, READ_BUF_SIZE, redirection_done, ResetLatch(), rotation_disabled, rotation_requested, set_next_rotation_time(), SIG_DFL, SIG_IGN, SIGALRM, SIGCHLD, SIGHUP, SignalHandlerForConfigReload(), SIGPIPE, SIGQUIT, SIGUSR1, sigUsr1Handler(), SIGUSR2, STDERR_FILENO, STDOUT_FILENO, syslogFile, SysloggerStartupData::syslogFile, syslogPipe, UnBlockSig, update_metainfo_datafile(), WaitEventSetWait(), whereToSendOutput, WL_LATCH_SET, and WL_SOCKET_READABLE.

◆ update_metainfo_datafile()

static void update_metainfo_datafile ( void  )
static

Definition at line 1476 of file syslogger.c.

1477 {
1478  FILE *fh;
1479  mode_t oumask;
1480 
1484  {
1485  if (unlink(LOG_METAINFO_DATAFILE) < 0 && errno != ENOENT)
1486  ereport(LOG,
1488  errmsg("could not remove file \"%s\": %m",
1490  return;
1491  }
1492 
1493  /* use the same permissions as the data directory for the new file */
1494  oumask = umask(pg_mode_mask);
1495  fh = fopen(LOG_METAINFO_DATAFILE_TMP, "w");
1496  umask(oumask);
1497 
1498  if (fh)
1499  {
1500  setvbuf(fh, NULL, PG_IOLBF, 0);
1501 
1502 #ifdef WIN32
1503  /* use CRLF line endings on Windows */
1504  _setmode(_fileno(fh), _O_TEXT);
1505 #endif
1506  }
1507  else
1508  {
1509  ereport(LOG,
1511  errmsg("could not open file \"%s\": %m",
1513  return;
1514  }
1515 
1517  {
1518  if (fprintf(fh, "stderr %s\n", last_sys_file_name) < 0)
1519  {
1520  ereport(LOG,
1522  errmsg("could not write file \"%s\": %m",
1524  fclose(fh);
1525  return;
1526  }
1527  }
1528 
1530  {
1531  if (fprintf(fh, "csvlog %s\n", last_csv_file_name) < 0)
1532  {
1533  ereport(LOG,
1535  errmsg("could not write file \"%s\": %m",
1537  fclose(fh);
1538  return;
1539  }
1540  }
1541 
1543  {
1544  if (fprintf(fh, "jsonlog %s\n", last_json_file_name) < 0)
1545  {
1546  ereport(LOG,
1548  errmsg("could not write file \"%s\": %m",
1550  fclose(fh);
1551  return;
1552  }
1553  }
1554  fclose(fh);
1555 
1557  ereport(LOG,
1559  errmsg("could not rename file \"%s\" to \"%s\": %m",
1561 }
int pg_mode_mask
Definition: file_perm.c:25
#define fprintf
Definition: port.h:242
#define LOG_METAINFO_DATAFILE_TMP
Definition: syslogger.h:99
#define LOG_METAINFO_DATAFILE
Definition: syslogger.h:98

References ereport, errcode_for_file_access(), errmsg(), fprintf, last_csv_file_name, last_json_file_name, last_sys_file_name, LOG, Log_destination, LOG_DESTINATION_CSVLOG, LOG_DESTINATION_JSONLOG, LOG_DESTINATION_STDERR, LOG_METAINFO_DATAFILE, LOG_METAINFO_DATAFILE_TMP, PG_IOLBF, and pg_mode_mask.

Referenced by logfile_rotate(), and SysLoggerMain().

◆ write_syslogger_file()

void write_syslogger_file ( const char *  buffer,
int  count,
int  destination 
)

Definition at line 1094 of file syslogger.c.

1095 {
1096  int rc;
1097  FILE *logfile;
1098 
1099  /*
1100  * If we're told to write to a structured log file, but it's not open,
1101  * dump the data to syslogFile (which is always open) instead. This can
1102  * happen if structured output is enabled after postmaster start and we've
1103  * been unable to open logFile. There are also race conditions during a
1104  * parameter change whereby backends might send us structured output
1105  * before we open the logFile or after we close it. Writing formatted
1106  * output to the regular log file isn't great, but it beats dropping log
1107  * output on the floor.
1108  *
1109  * Think not to improve this by trying to open logFile on-the-fly. Any
1110  * failure in that would lead to recursion.
1111  */
1112  if ((destination & LOG_DESTINATION_CSVLOG) && csvlogFile != NULL)
1113  logfile = csvlogFile;
1114  else if ((destination & LOG_DESTINATION_JSONLOG) && jsonlogFile != NULL)
1115  logfile = jsonlogFile;
1116  else
1117  logfile = syslogFile;
1118 
1119  rc = fwrite(buffer, 1, count, logfile);
1120 
1121  /*
1122  * Try to report any failure. We mustn't use ereport because it would
1123  * just recurse right back here, but write_stderr is OK: it will write
1124  * either to the postmaster's original stderr, or to /dev/null, but never
1125  * to our input pipe which would result in a different sort of looping.
1126  */
1127  if (rc != count)
1128  write_stderr("could not write to log file: %m\n");
1129 }
#define write_stderr(str)
Definition: parallel.c:184
static FILE * logfile
Definition: pg_regress.c:127

References csvlogFile, jsonlogFile, LOG_DESTINATION_CSVLOG, LOG_DESTINATION_JSONLOG, logfile, syslogFile, and write_stderr.

Referenced by flush_pipe_input(), process_pipe_input(), send_message_to_server_log(), write_csvlog(), and write_jsonlog().

Variable Documentation

◆ buffer_lists

List* buffer_lists[NBUFFER_LISTS]
static

Definition at line 112 of file syslogger.c.

Referenced by flush_pipe_input(), and process_pipe_input().

◆ csvlogFile

FILE* csvlogFile = NULL
static

Definition at line 87 of file syslogger.c.

Referenced by logfile_rotate(), SysLogger_Start(), SysLoggerMain(), and write_syslogger_file().

◆ first_syslogger_file_time

NON_EXEC_STATIC pg_time_t first_syslogger_file_time = 0

Definition at line 89 of file syslogger.c.

Referenced by SysLogger_Start(), and SysLoggerMain().

◆ jsonlogFile

FILE* jsonlogFile = NULL
static

Definition at line 88 of file syslogger.c.

Referenced by logfile_rotate(), SysLogger_Start(), SysLoggerMain(), and write_syslogger_file().

◆ last_csv_file_name

char* last_csv_file_name = NULL
static

Definition at line 91 of file syslogger.c.

Referenced by logfile_rotate(), SysLoggerMain(), and update_metainfo_datafile().

◆ last_json_file_name

char* last_json_file_name = NULL
static

Definition at line 92 of file syslogger.c.

Referenced by logfile_rotate(), SysLoggerMain(), and update_metainfo_datafile().

◆ last_sys_file_name

char* last_sys_file_name = NULL
static

Definition at line 90 of file syslogger.c.

Referenced by logfile_rotate(), SysLoggerMain(), and update_metainfo_datafile().

◆ Log_directory

char* Log_directory = NULL

◆ Log_file_mode

int Log_file_mode = S_IRUSR | S_IWUSR

Definition at line 76 of file syslogger.c.

Referenced by logfile_open(), and show_log_file_mode().

◆ Log_filename

char* Log_filename = NULL

Definition at line 74 of file syslogger.c.

Referenced by logfile_getname(), and SysLoggerMain().

◆ Log_RotationAge

int Log_RotationAge = HOURS_PER_DAY * MINS_PER_HOUR

Definition at line 71 of file syslogger.c.

Referenced by set_next_rotation_time(), and SysLoggerMain().

◆ Log_RotationSize

int Log_RotationSize = 10 * 1024

Definition at line 72 of file syslogger.c.

Referenced by SysLoggerMain().

◆ Log_truncate_on_rotation

bool Log_truncate_on_rotation = false

Definition at line 75 of file syslogger.c.

Referenced by logfile_rotate_dest().

◆ Logging_collector

bool Logging_collector = false

Definition at line 70 of file syslogger.c.

Referenced by pg_rotate_logfile(), ServerLoop(), and SysLogger_Start().

◆ next_rotation_time

pg_time_t next_rotation_time
static

Definition at line 83 of file syslogger.c.

Referenced by logfile_rotate(), set_next_rotation_time(), and SysLoggerMain().

◆ pipe_eof_seen

bool pipe_eof_seen = false
static

Definition at line 84 of file syslogger.c.

Referenced by SysLoggerMain().

◆ redirection_done

bool redirection_done
extern

Definition at line 353 of file postmaster.c.

Referenced by SysLogger_Start(), and SysLoggerMain().

◆ rotation_disabled

bool rotation_disabled = false
static

Definition at line 85 of file syslogger.c.

Referenced by logfile_rotate_dest(), and SysLoggerMain().

◆ rotation_requested

volatile sig_atomic_t rotation_requested = false
static

Definition at line 129 of file syslogger.c.

Referenced by logfile_rotate(), sigUsr1Handler(), and SysLoggerMain().

◆ syslogFile

FILE* syslogFile = NULL
static

Definition at line 86 of file syslogger.c.

Referenced by logfile_rotate(), SysLogger_Start(), SysLoggerMain(), and write_syslogger_file().

◆ syslogPipe

int syslogPipe[2] = {-1, -1}

Definition at line 116 of file syslogger.c.

Referenced by ClosePostmasterPorts(), SysLogger_Start(), and SysLoggerMain().