PostgreSQL Source Code git master
Data Structures | Macros | Functions | Variables
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 (const void *startup_data, size_t startup_data_len)
 
int  SysLogger_Start (int child_slot)
 
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
 
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 List *  buffer_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 109 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 1574 of file syslogger.c.

1575{
1576 struct stat stat_buf;
1577
1578 if (stat(LOGROTATE_SIGNAL_FILE, &stat_buf) == 0)
1579 return true;
1580
1581 return false;
1582}
Definition: win32_port.h:255
#define LOGROTATE_SIGNAL_FILE
Definition: syslogger.c:63
#define stat
Definition: win32_port.h:274

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 1042 of file syslogger.c.

1043{
1044 int i;
1045
1046 /* Dump any incomplete protocol messages */
1047 for (i = 0; i < NBUFFER_LISTS; i++)
1048 {
1049 List *list = buffer_lists[i];
1050 ListCell *cell;
1051
1052 foreach(cell, list)
1053 {
1054 save_buffer *buf = (save_buffer *) lfirst(cell);
1055
1056 if (buf->pid != 0)
1057 {
1058 StringInfo str = &(buf->data);
1059
1060 write_syslogger_file(str->data, str->len,
1062 /* Mark the buffer unused, and reclaim string storage */
1063 buf->pid = 0;
1064 pfree(str->data);
1065 }
1066 }
1067 }
1068
1069 /*
1070 * Force out any remaining pipe data as-is; we don't bother trying to
1071 * remove any protocol headers that may exist in it.
1072 */
1073 if (*bytes_in_logbuffer > 0)
1074 write_syslogger_file(logbuffer, *bytes_in_logbuffer,
1076 *bytes_in_logbuffer = 0;
1077}
#define LOG_DESTINATION_STDERR
Definition: elog.h:485
const char * str
i
int i
Definition: isn.c:77
void pfree(void *pointer)
Definition: mcxt.c:1594
#define lfirst(lc)
Definition: pg_list.h:172
static char * buf
Definition: pg_test_fsync.c:72
Definition: pg_list.h:54
Definition: syslogger.c:104
#define NBUFFER_LISTS
Definition: syslogger.c:109
void write_syslogger_file(const char *buffer, int count, int destination)
Definition: syslogger.c:1093
static List * buffer_lists[NBUFFER_LISTS]
Definition: syslogger.c:110
Definition: pg_list.h:46

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 1412 of file syslogger.c.

1413{
1414 char *filename;
1415 int len;
1416
1418
1420
1421 len = strlen(filename);
1422
1423 /* treat Log_filename as a strftime pattern */
1426
1427 if (suffix != NULL)
1428 {
1429 len = strlen(filename);
1430 if (len > 4 && (strcmp(filename + (len - 4), ".log") == 0))
1431 len -= 4;
1432 strlcpy(filename + len, suffix, MAXPGPATH - len);
1433 }
1434
1435 return filename;
1436}
void * palloc(Size size)
Definition: mcxt.c:1365
#define MAXPGPATH
const void size_t len
static char * filename
Definition: pg_dumpall.c:120
size_t pg_strftime(char *s, size_t maxsize, const char *format, const struct pg_tm *t)
Definition: strftime.c:128
struct pg_tm * pg_localtime(const pg_time_t *timep, const pg_tz *tz)
Definition: localtime.c:1344
PGDLLIMPORT pg_tz * log_timezone
Definition: pgtz.c:31
int64 timestamp
#define snprintf
Definition: port.h:239
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 1219 of file syslogger.c.

1220{
1221 FILE *fh;
1222 mode_t oumask;
1223
1224 /*
1225 * Note we do not let Log_file_mode disable IWUSR, since we certainly want
1226 * to be able to write the files ourselves.
1227 */
1228 oumask = umask((mode_t) ((~(Log_file_mode | S_IWUSR)) & (S_IRWXU | S_IRWXG | S_IRWXO)));
1229 fh = fopen(filename, mode);
1230 umask(oumask);
1231
1232 if (fh)
1233 {
1234 setvbuf(fh, NULL, PG_IOLBF, 0);
1235
1236#ifdef WIN32
1237 /* use CRLF line endings on Windows */
1238 _setmode(_fileno(fh), _O_TEXT);
1239#endif
1240 }
1241 else
1242 {
1243 int save_errno = errno;
1244
1245 ereport(allow_errors ? LOG : FATAL,
1247 errmsg("could not open log file \"%s\": %m",
1248 filename)));
1249 errno = save_errno;
1250 }
1251
1252 return fh;
1253}
int errcode_for_file_access(void)
Definition: elog.c:877
int errmsg(const char *fmt,...)
Definition: elog.c:1071
#define LOG
Definition: elog.h:31
#define FATAL
Definition: elog.h:41
#define ereport(elevel,...)
Definition: elog.h:150
static PgChecksumMode mode
Definition: pg_checksums.c:55
#define PG_IOLBF
Definition: port.h:389
int Log_file_mode
Definition: syslogger.c:76
#define S_IRWXG
Definition: win32_port.h:300
#define S_IRWXO
Definition: win32_port.h:312
#define S_IWUSR
Definition: win32_port.h:282
#define S_IRWXU
Definition: win32_port.h:288

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 1363 of file syslogger.c.

1364{
1365 pg_time_t fntime;
1366
1367 rotation_requested = false;
1368
1369 /*
1370 * When doing a time-based rotation, invent the new logfile name based on
1371 * the planned rotation time, not current time, to avoid "slippage" in the
1372 * file name when we don't do the rotation immediately.
1373 */
1374 if (time_based_rotation)
1375 fntime = next_rotation_time;
1376 else
1377 fntime = time(NULL);
1378
1379 /* file rotation for stderr */
1380 if (!logfile_rotate_dest(time_based_rotation, size_rotation_for, fntime,
1382 &syslogFile))
1383 return;
1384
1385 /* file rotation for csvlog */
1386 if (!logfile_rotate_dest(time_based_rotation, size_rotation_for, fntime,
1388 &csvlogFile))
1389 return;
1390
1391 /* file rotation for jsonlog */
1392 if (!logfile_rotate_dest(time_based_rotation, size_rotation_for, fntime,
1394 &jsonlogFile))
1395 return;
1396
1398
1400}
#define LOG_DESTINATION_JSONLOG
Definition: elog.h:489
#define LOG_DESTINATION_CSVLOG
Definition: elog.h:488
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:1264
static void update_metainfo_datafile(void)
Definition: syslogger.c:1477
static char * last_csv_file_name
Definition: syslogger.c:89
static FILE * syslogFile
Definition: syslogger.c:84
static pg_time_t next_rotation_time
Definition: syslogger.c:81
static volatile sig_atomic_t rotation_requested
Definition: syslogger.c:127
static FILE * csvlogFile
Definition: syslogger.c:85
static void set_next_rotation_time(void)
Definition: syslogger.c:1442
static FILE * jsonlogFile
Definition: syslogger.c:86
static char * last_json_file_name
Definition: syslogger.c:90
static char * last_sys_file_name
Definition: syslogger.c:88

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 1264 of file syslogger.c.

1267{
1268 char *logFileExt = NULL;
1269 char *filename;
1270 FILE *fh;
1271
1272 /*
1273 * If the target destination was just turned off, close the previous file
1274 * and unregister its data. This cannot happen for stderr as syslogFile
1275 * is assumed to be always opened even if stderr is disabled in
1276 * log_destination.
1277 */
1278 if ((Log_destination & target_dest) == 0 &&
1279 target_dest != LOG_DESTINATION_STDERR)
1280 {
1281 if (*logFile != NULL)
1282 fclose(*logFile);
1283 *logFile = NULL;
1284 if (*last_file_name != NULL)
1285 pfree(*last_file_name);
1286 *last_file_name = NULL;
1287 return true;
1288 }
1289
1290 /*
1291 * Leave if it is not time for a rotation or if the target destination has
1292 * no need to do a rotation based on the size of its file.
1293 */
1294 if (!time_based_rotation && (size_rotation_for & target_dest) == 0)
1295 return true;
1296
1297 /* file extension depends on the destination type */
1298 if (target_dest == LOG_DESTINATION_STDERR)
1299 logFileExt = NULL;
1300 else if (target_dest == LOG_DESTINATION_CSVLOG)
1301 logFileExt = ".csv";
1302 else if (target_dest == LOG_DESTINATION_JSONLOG)
1303 logFileExt = ".json";
1304 else
1305 {
1306 /* cannot happen */
1307 Assert(false);
1308 }
1309
1310 /* build the new file name */
1311 filename = logfile_getname(fntime, logFileExt);
1312
1313 /*
1314 * Decide whether to overwrite or append. We can overwrite if (a)
1315 * Log_truncate_on_rotation is set, (b) the rotation was triggered by
1316 * elapsed time and not something else, and (c) the computed file name is
1317 * different from what we were previously logging into.
1318 */
1319 if (Log_truncate_on_rotation && time_based_rotation &&
1320 *last_file_name != NULL &&
1321 strcmp(filename, *last_file_name) != 0)
1322 fh = logfile_open(filename, "w", true);
1323 else
1324 fh = logfile_open(filename, "a", true);
1325
1326 if (!fh)
1327 {
1328 /*
1329 * ENFILE/EMFILE are not too surprising on a busy system; just keep
1330 * using the old file till we manage to get a new one. Otherwise,
1331 * assume something's wrong with Log_directory and stop trying to
1332 * create files.
1333 */
1334 if (errno != ENFILE && errno != EMFILE)
1335 {
1336 ereport(LOG,
1337 (errmsg("disabling automatic rotation (use SIGHUP to re-enable)")));
1338 rotation_disabled = true;
1339 }
1340
1341 if (filename)
1342 pfree(filename);
1343 return false;
1344 }
1345
1346 /* fill in the new information */
1347 if (*logFile != NULL)
1348 fclose(*logFile);
1349 *logFile = fh;
1350
1351 /* instead of pfree'ing filename, remember it for next time */
1352 if (*last_file_name != NULL)
1353 pfree(*last_file_name);
1354 *last_file_name = filename;
1355
1356 return true;
1357}
int Log_destination
Definition: elog.c:111
Assert(PointerIsAligned(start, uint64))
bool Log_truncate_on_rotation
Definition: syslogger.c:75
static bool rotation_disabled
Definition: syslogger.c:83
static char * logfile_getname(pg_time_t timestamp, const char *suffix)
Definition: syslogger.c:1412
static FILE * logfile_open(const char *filename, const char *mode, bool allow_errors)
Definition: syslogger.c:1219

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 879 of file syslogger.c.

880{
881 char *cursor = logbuffer;
882 int count = *bytes_in_logbuffer;
884
885 /* While we have enough for a header, process data... */
886 while (count >= (int) (offsetof(PipeProtoHeader, data) + 1))
887 {
889 int chunklen;
890 bits8 dest_flags;
891
892 /* Do we have a valid header? */
893 memcpy(&p, cursor, offsetof(PipeProtoHeader, data));
894 dest_flags = p.flags & (PIPE_PROTO_DEST_STDERR |
897 if (p.nuls[0] == '0円' && p.nuls[1] == '0円' &&
898 p.len > 0 && p.len <= PIPE_MAX_PAYLOAD &&
899 p.pid != 0 &&
900 pg_number_of_ones[dest_flags] == 1)
901 {
902 List *buffer_list;
903 ListCell *cell;
904 save_buffer *existing_slot = NULL,
905 *free_slot = NULL;
907
908 chunklen = PIPE_HEADER_SIZE + p.len;
909
910 /* Fall out of loop if we don't have the whole chunk yet */
911 if (count < chunklen)
912 break;
913
914 if ((p.flags & PIPE_PROTO_DEST_STDERR) != 0)
916 else if ((p.flags & PIPE_PROTO_DEST_CSVLOG) != 0)
918 else if ((p.flags & PIPE_PROTO_DEST_JSONLOG) != 0)
920 else
921 {
922 /* this should never happen as of the header validation */
923 Assert(false);
924 }
925
926 /* Locate any existing buffer for this source pid */
927 buffer_list = buffer_lists[p.pid % NBUFFER_LISTS];
928 foreach(cell, buffer_list)
929 {
930 save_buffer *buf = (save_buffer *) lfirst(cell);
931
932 if (buf->pid == p.pid)
933 {
934 existing_slot = buf;
935 break;
936 }
937 if (buf->pid == 0 && free_slot == NULL)
938 free_slot = buf;
939 }
940
941 if ((p.flags & PIPE_PROTO_IS_LAST) == 0)
942 {
943 /*
944 * Save a complete non-final chunk in a per-pid buffer
945 */
946 if (existing_slot != NULL)
947 {
948 /* Add chunk to data from preceding chunks */
949 str = &(existing_slot->data);
952 p.len);
953 }
954 else
955 {
956 /* First chunk of message, save in a new buffer */
957 if (free_slot == NULL)
958 {
959 /*
960 * Need a free slot, but there isn't one in the list,
961 * so create a new one and extend the list with it.
962 */
963 free_slot = palloc(sizeof(save_buffer));
964 buffer_list = lappend(buffer_list, free_slot);
965 buffer_lists[p.pid % NBUFFER_LISTS] = buffer_list;
966 }
967 free_slot->pid = p.pid;
968 str = &(free_slot->data);
972 p.len);
973 }
974 }
975 else
976 {
977 /*
978 * Final chunk --- add it to anything saved for that pid, and
979 * either way write the whole thing out.
980 */
981 if (existing_slot != NULL)
982 {
983 str = &(existing_slot->data);
986 p.len);
987 write_syslogger_file(str->data, str->len, dest);
988 /* Mark the buffer unused, and reclaim string storage */
989 existing_slot->pid = 0;
990 pfree(str->data);
991 }
992 else
993 {
994 /* The whole message was one chunk, evidently. */
996 dest);
997 }
998 }
999
1000 /* Finished processing this chunk */
1001 cursor += chunklen;
1002 count -= chunklen;
1003 }
1004 else
1005 {
1006 /* Process non-protocol data */
1007
1008 /*
1009 * Look for the start of a protocol header. If found, dump data
1010 * up to there and repeat the loop. Otherwise, dump it all and
1011 * fall out of the loop. (Note: we want to dump it all if at all
1012 * possible, so as to avoid dividing non-protocol messages across
1013 * logfiles. We expect that in many scenarios, a non-protocol
1014 * message will arrive all in one read(), and we want to respect
1015 * the read() boundary if possible.)
1016 */
1017 for (chunklen = 1; chunklen < count; chunklen++)
1018 {
1019 if (cursor[chunklen] == '0円')
1020 break;
1021 }
1022 /* fall back on the stderr log as the destination */
1024 cursor += chunklen;
1025 count -= chunklen;
1026 }
1027 }
1028
1029 /* We don't have a full chunk, so left-align what remains in the buffer */
1030 if (count > 0 && cursor != logbuffer)
1031 memmove(logbuffer, cursor, count);
1032 *bytes_in_logbuffer = count;
1033}
uint8 bits8
Definition: c.h:545
List * lappend(List *list, void *datum)
Definition: list.c:339
dest
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:281
void initStringInfo(StringInfo str)
Definition: stringinfo.c:97
char nuls[2]
Definition: syslogger.h:46
bits8 flags
Definition: syslogger.h:49
uint16 len
Definition: syslogger.h:47
int32 pid
Definition: syslogger.h:48
Definition: type.h:138
StringInfoData data
Definition: syslogger.c:106
int32 pid
Definition: syslogger.c:105
#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 1588 of file syslogger.c.

1589{
1590 unlink(LOGROTATE_SIGNAL_FILE);
1591}

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 1442 of file syslogger.c.

1443{
1444 pg_time_t now;
1445 struct pg_tm *tm;
1446 int rotinterval;
1447
1448 /* nothing to do if time-based rotation is disabled */
1449 if (Log_RotationAge <= 0)
1450 return;
1451
1452 /*
1453 * The requirements here are to choose the next time > now that is a
1454 * "multiple" of the log rotation interval. "Multiple" can be interpreted
1455 * fairly loosely. In this version we align to log_timezone rather than
1456 * GMT.
1457 */
1458 rotinterval = Log_RotationAge * SECS_PER_MINUTE; /* convert to seconds */
1459 now = (pg_time_t) time(NULL);
1461 now += tm->tm_gmtoff;
1462 now -= now % rotinterval;
1463 now += rotinterval;
1464 now -= tm->tm_gmtoff;
1466}
Datum now(PG_FUNCTION_ARGS)
Definition: timestamp.c:1609
#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 1595 of file syslogger.c.

1596{
1597 rotation_requested = true;
1599}
struct Latch * MyLatch
Definition: globals.c:63
void SetLatch(Latch *latch)
Definition: latch.c:290

References MyLatch, rotation_requested, and SetLatch().

Referenced by SysLoggerMain().

◆ SysLogger_Start()

int SysLogger_Start ( int  child_slot )

Definition at line 593 of file syslogger.c.

594{
595 pid_t sysloggerPid;
596 char *filename;
597#ifdef EXEC_BACKEND
598 SysloggerStartupData startup_data;
599#endif /* EXEC_BACKEND */
600
602
603 /*
604 * If first time through, create the pipe which will receive stderr
605 * output.
606 *
607 * If the syslogger crashes and needs to be restarted, we continue to use
608 * the same pipe (indeed must do so, since extant backends will be writing
609 * into that pipe).
610 *
611 * This means the postmaster must continue to hold the read end of the
612 * pipe open, so we can pass it down to the reincarnated syslogger. This
613 * is a bit klugy but we have little choice.
614 *
615 * Also note that we don't bother counting the pipe FDs by calling
616 * Reserve/ReleaseExternalFD. There's no real need to account for them
617 * accurately in the postmaster or syslogger process, and both ends of the
618 * pipe will wind up closed in all other postmaster children.
619 */
620#ifndef WIN32
621 if (syslogPipe[0] < 0)
622 {
623 if (pipe(syslogPipe) < 0)
626 errmsg("could not create pipe for syslog: %m")));
627 }
628#else
629 if (!syslogPipe[0])
630 {
631 SECURITY_ATTRIBUTES sa;
632
633 memset(&sa, 0, sizeof(SECURITY_ATTRIBUTES));
634 sa.nLength = sizeof(SECURITY_ATTRIBUTES);
635 sa.bInheritHandle = TRUE;
636
637 if (!CreatePipe(&syslogPipe[0], &syslogPipe[1], &sa, 32768))
640 errmsg("could not create pipe for syslog: %m")));
641 }
642#endif
643
644 /*
645 * Create log directory if not present; ignore errors
646 */
648
649 /*
650 * The initial logfile is created right in the postmaster, to verify that
651 * the Log_directory is writable. We save the reference time so that the
652 * syslogger child process can recompute this file name.
653 *
654 * It might look a bit strange to re-do this during a syslogger restart,
655 * but we must do so since the postmaster closed syslogFile after the
656 * previous fork (and remembering that old file wouldn't be right anyway).
657 * Note we always append here, we won't overwrite any existing file. This
658 * is consistent with the normal rules, because by definition this is not
659 * a time-based rotation.
660 */
661 first_syslogger_file_time = time(NULL);
662
664
665 syslogFile = logfile_open(filename, "a", false);
666
668
669 /*
670 * Likewise for the initial CSV log file, if that's enabled. (Note that
671 * we open syslogFile even when only CSV output is nominally enabled,
672 * since some code paths will write to syslogFile anyway.)
673 */
675 {
677
678 csvlogFile = logfile_open(filename, "a", false);
679
681 }
682
683 /*
684 * Likewise for the initial JSON log file, if that's enabled. (Note that
685 * we open syslogFile even when only JSON output is nominally enabled,
686 * since some code paths will write to syslogFile anyway.)
687 */
689 {
691
692 jsonlogFile = logfile_open(filename, "a", false);
693
695 }
696
697#ifdef EXEC_BACKEND
698 startup_data.syslogFile = syslogger_fdget(syslogFile);
699 startup_data.csvlogFile = syslogger_fdget(csvlogFile);
700 startup_data.jsonlogFile = syslogger_fdget(jsonlogFile);
701 sysloggerPid = postmaster_child_launch(B_LOGGER, child_slot,
702 &startup_data, sizeof(startup_data), NULL);
703#else
704 sysloggerPid = postmaster_child_launch(B_LOGGER, child_slot,
705 NULL, 0, NULL);
706#endif /* EXEC_BACKEND */
707
708 if (sysloggerPid == -1)
709 {
710 ereport(LOG,
711 (errmsg("could not fork system logger: %m")));
712 return 0;
713 }
714
715 /* success, in postmaster */
716
717 /* now we redirect stderr, if not done already */
718 if (!redirection_done)
719 {
720#ifdef WIN32
721 int fd;
722#endif
723
724 /*
725 * Leave a breadcrumb trail when redirecting, in case the user forgets
726 * that redirection is active and looks only at the original stderr
727 * target file.
728 */
729 ereport(LOG,
730 (errmsg("redirecting log output to logging collector process"),
731 errhint("Future log output will appear in directory \"%s\".",
732 Log_directory)));
733
734#ifndef WIN32
735 fflush(stdout);
736 if (dup2(syslogPipe[1], STDOUT_FILENO) < 0)
739 errmsg("could not redirect stdout: %m")));
740 fflush(stderr);
741 if (dup2(syslogPipe[1], STDERR_FILENO) < 0)
744 errmsg("could not redirect stderr: %m")));
745 /* Now we are done with the write end of the pipe. */
746 close(syslogPipe[1]);
747 syslogPipe[1] = -1;
748#else
749
750 /*
751 * open the pipe in binary mode and make sure stderr is binary after
752 * it's been dup'ed into, to avoid disturbing the pipe chunking
753 * protocol.
754 */
755 fflush(stderr);
756 fd = _open_osfhandle((intptr_t) syslogPipe[1],
757 _O_APPEND | _O_BINARY);
758 if (dup2(fd, STDERR_FILENO) < 0)
761 errmsg("could not redirect stderr: %m")));
762 close(fd);
763 _setmode(STDERR_FILENO, _O_BINARY);
764
765 /*
766 * Now we are done with the write end of the pipe. CloseHandle() must
767 * not be called because the preceding close() closes the underlying
768 * handle.
769 */
770 syslogPipe[1] = 0;
771#endif
772 redirection_done = true;
773 }
774
775 /* postmaster will never write the file(s); close 'em */
776 fclose(syslogFile);
777 syslogFile = NULL;
778 if (csvlogFile != NULL)
779 {
780 fclose(csvlogFile);
781 csvlogFile = NULL;
782 }
783 if (jsonlogFile != NULL)
784 {
785 fclose(jsonlogFile);
786 jsonlogFile = NULL;
787 }
788 return (int) sysloggerPid;
789}
int errcode_for_socket_access(void)
Definition: elog.c:954
int errhint(const char *fmt,...)
Definition: elog.c:1321
int MakePGDirectory(const char *directoryName)
Definition: fd.c:3975
#define close(a)
Definition: win32.h:12
pid_t postmaster_child_launch(BackendType child_type, int child_slot, void *startup_data, size_t startup_data_len, ClientSocket *client_sock)
@ B_LOGGER
Definition: miscadmin.h:373
stdout
bool redirection_done
Definition: postmaster.c:375
static int fd(const char *x, int i)
Definition: preproc-init.c:105
Definition: preproc-init.c:83
NON_EXEC_STATIC pg_time_t first_syslogger_file_time
Definition: syslogger.c:87
int syslogPipe[2]
Definition: syslogger.c:114
bool Logging_collector
Definition: syslogger.c:70
#define STDOUT_FILENO
Definition: unistd.h:8
#define STDERR_FILENO
Definition: unistd.h:9

References Assert(), B_LOGGER, close, csvlogFile, SysloggerStartupData::csvlogFile, ereport, errcode_for_file_access(), errcode_for_socket_access(), errhint(), errmsg(), FATAL, fd(), 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 StartSysLogger().

◆ SysLoggerMain()

void SysLoggerMain ( const void *  startup_data,
size_t  startup_data_len 
)

Definition at line 165 of file syslogger.c.

166{
167#ifndef WIN32
168 char logbuffer[READ_BUF_SIZE];
169 int bytes_in_logbuffer = 0;
170#endif
171 char *currentLogDir;
172 char *currentLogFilename;
173 int currentLogRotationAge;
175 WaitEventSet *wes;
176
177 /*
178 * Re-open the error output files that were opened by SysLogger_Start().
179 *
180 * We expect this will always succeed, which is too optimistic, but if it
181 * fails there's not a lot we can do to report the problem anyway. As
182 * coded, we'll just crash on a null pointer dereference after failure...
183 */
184#ifdef EXEC_BACKEND
185 {
186 const SysloggerStartupData *slsdata = startup_data;
187
188 Assert(startup_data_len == sizeof(*slsdata));
189 syslogFile = syslogger_fdopen(slsdata->syslogFile);
190 csvlogFile = syslogger_fdopen(slsdata->csvlogFile);
191 jsonlogFile = syslogger_fdopen(slsdata->jsonlogFile);
192 }
193#else
194 Assert(startup_data_len == 0);
195#endif
196
197 /*
198 * Now that we're done reading the startup data, release postmaster's
199 * working memory context.
200 */
202 {
204 PostmasterContext = NULL;
205 }
206
208
210 init_ps_display(NULL);
211
212 /*
213 * If we restarted, our stderr is already redirected into our own input
214 * pipe. This is of course pretty useless, not to mention that it
215 * interferes with detecting pipe EOF. Point stderr to /dev/null. This
216 * assumes that all interesting messages generated in the syslogger will
217 * come through elog.c and will be sent to write_syslogger_file.
218 */
220 {
221 int fd = open(DEVNULL, O_WRONLY, 0);
222
223 /*
224 * The closes might look redundant, but they are not: we want to be
225 * darn sure the pipe gets closed even if the open failed. We can
226 * survive running with stderr pointing nowhere, but we can't afford
227 * to have extra pipe input descriptors hanging around.
228 *
229 * As we're just trying to reset these to go to DEVNULL, there's not
230 * much point in checking for failure from the close/dup2 calls here,
231 * if they fail then presumably the file descriptors are closed and
232 * any writes will go into the bitbucket anyway.
233 */
236 if (fd != -1)
237 {
238 (void) dup2(fd, STDOUT_FILENO);
239 (void) dup2(fd, STDERR_FILENO);
240 close(fd);
241 }
242 }
243
244 /*
245 * Syslogger's own stderr can't be the syslogPipe, so set it back to text
246 * mode if we didn't just close it. (It was set to binary in
247 * SubPostmasterMain).
248 */
249#ifdef WIN32
250 else
251 _setmode(STDERR_FILENO, _O_TEXT);
252#endif
253
254 /*
255 * Also close our copy of the write end of the pipe. This is needed to
256 * ensure we can detect pipe EOF correctly. (But note that in the restart
257 * case, the postmaster already did this.)
258 */
259#ifndef WIN32
260 if (syslogPipe[1] >= 0)
261 close(syslogPipe[1]);
262 syslogPipe[1] = -1;
263#else
264 if (syslogPipe[1])
265 CloseHandle(syslogPipe[1]);
266 syslogPipe[1] = 0;
267#endif
268
269 /*
270 * Properly accept or ignore signals the postmaster might send us
271 *
272 * Note: we ignore all termination signals, and instead exit only when all
273 * upstream processes are gone, to ensure we don't miss any dying gasps of
274 * broken backends...
275 */
276
277 pqsignal(SIGHUP, SignalHandlerForConfigReload); /* set flag to read config
278 * file */
279 pqsignal(SIGINT, SIG_IGN);
280 pqsignal(SIGTERM, SIG_IGN);
281 pqsignal(SIGQUIT, SIG_IGN);
282 pqsignal(SIGALRM, SIG_IGN);
283 pqsignal(SIGPIPE, SIG_IGN);
284 pqsignal(SIGUSR1, sigUsr1Handler); /* request log rotation */
285 pqsignal(SIGUSR2, SIG_IGN);
286
287 /*
288 * Reset some signals that are accepted by postmaster but not here
289 */
290 pqsignal(SIGCHLD, SIG_DFL);
291
292 sigprocmask(SIG_SETMASK, &UnBlockSig, NULL);
293
294#ifdef WIN32
295 /* Fire up separate data transfer thread */
296 InitializeCriticalSection(&sysloggerSection);
297 EnterCriticalSection(&sysloggerSection);
298
299 threadHandle = (HANDLE) _beginthreadex(NULL, 0, pipeThread, NULL, 0, NULL);
300 if (threadHandle == 0)
301 elog(FATAL, "could not create syslogger data transfer thread: %m");
302#endif /* WIN32 */
303
304 /*
305 * Remember active logfiles' name(s). We recompute 'em from the reference
306 * time because passing down just the pg_time_t is a lot cheaper than
307 * passing a whole file path in the EXEC_BACKEND case.
308 */
310 if (csvlogFile != NULL)
312 if (jsonlogFile != NULL)
314
315 /* remember active logfile parameters */
316 currentLogDir = pstrdup(Log_directory);
317 currentLogFilename = pstrdup(Log_filename);
318 currentLogRotationAge = Log_RotationAge;
319 /* set next planned rotation time */
322
323 /*
324 * Reset whereToSendOutput, as the postmaster will do (but hasn't yet, at
325 * the point where we forked). This prevents duplicate output of messages
326 * from syslogger itself.
327 */
329
330 /*
331 * Set up a reusable WaitEventSet object we'll use to wait for our latch,
332 * and (except on Windows) our socket.
333 *
334 * Unlike all other postmaster child processes, we'll ignore postmaster
335 * death because we want to collect final log output from all backends and
336 * then exit last. We'll do that by running until we see EOF on the
337 * syslog pipe, which implies that all other backends have exited
338 * (including the postmaster).
339 */
340 wes = CreateWaitEventSet(NULL, 2);
342#ifndef WIN32
343 AddWaitEventToSet(wes, WL_SOCKET_READABLE, syslogPipe[0], NULL, NULL);
344#endif
345
346 /* main worker loop */
347 for (;;)
348 {
349 bool time_based_rotation = false;
350 int size_rotation_for = 0;
351 long cur_timeout;
352 WaitEvent event;
353
354#ifndef WIN32
355 int rc;
356#endif
357
358 /* Clear any already-pending wakeups */
360
361 /*
362 * Process any requests or signals received recently.
363 */
365 {
366 ConfigReloadPending = false;
368
369 /*
370 * Check if the log directory or filename pattern changed in
371 * postgresql.conf. If so, force rotation to make sure we're
372 * writing the logfiles in the right place.
373 */
374 if (strcmp(Log_directory, currentLogDir) != 0)
375 {
376 pfree(currentLogDir);
377 currentLogDir = pstrdup(Log_directory);
378 rotation_requested = true;
379
380 /*
381 * Also, create new directory if not present; ignore errors
382 */
384 }
385 if (strcmp(Log_filename, currentLogFilename) != 0)
386 {
387 pfree(currentLogFilename);
388 currentLogFilename = pstrdup(Log_filename);
389 rotation_requested = true;
390 }
391
392 /*
393 * Force a rotation if CSVLOG output was just turned on or off and
394 * we need to open or close csvlogFile accordingly.
395 */
397 (csvlogFile != NULL))
398 rotation_requested = true;
399
400 /*
401 * Force a rotation if JSONLOG output was just turned on or off
402 * and we need to open or close jsonlogFile accordingly.
403 */
405 (jsonlogFile != NULL))
406 rotation_requested = true;
407
408 /*
409 * If rotation time parameter changed, reset next rotation time,
410 * but don't immediately force a rotation.
411 */
412 if (currentLogRotationAge != Log_RotationAge)
413 {
414 currentLogRotationAge = Log_RotationAge;
416 }
417
418 /*
419 * If we had a rotation-disabling failure, re-enable rotation
420 * attempts after SIGHUP, and force one immediately.
421 */
423 {
424 rotation_disabled = false;
425 rotation_requested = true;
426 }
427
428 /*
429 * Force rewriting last log filename when reloading configuration.
430 * Even if rotation_requested is false, log_destination may have
431 * been changed and we don't want to wait the next file rotation.
432 */
434 }
435
437 {
438 /* Do a logfile rotation if it's time */
439 now = (pg_time_t) time(NULL);
440 if (now >= next_rotation_time)
441 rotation_requested = time_based_rotation = true;
442 }
443
445 {
446 /* Do a rotation if file is too big */
447 if (ftello(syslogFile) >= Log_RotationSize * (pgoff_t) 1024)
448 {
449 rotation_requested = true;
450 size_rotation_for |= LOG_DESTINATION_STDERR;
451 }
452 if (csvlogFile != NULL &&
454 {
455 rotation_requested = true;
456 size_rotation_for |= LOG_DESTINATION_CSVLOG;
457 }
458 if (jsonlogFile != NULL &&
460 {
461 rotation_requested = true;
462 size_rotation_for |= LOG_DESTINATION_JSONLOG;
463 }
464 }
465
467 {
468 /*
469 * Force rotation when both values are zero. It means the request
470 * was sent by pg_rotate_logfile() or "pg_ctl logrotate".
471 */
472 if (!time_based_rotation && size_rotation_for == 0)
473 size_rotation_for = LOG_DESTINATION_STDERR |
476 logfile_rotate(time_based_rotation, size_rotation_for);
477 }
478
479 /*
480 * Calculate time till next time-based rotation, so that we don't
481 * sleep longer than that. We assume the value of "now" obtained
482 * above is still close enough. Note we can't make this calculation
483 * until after calling logfile_rotate(), since it will advance
484 * next_rotation_time.
485 *
486 * Also note that we need to beware of overflow in calculation of the
487 * timeout: with large settings of Log_RotationAge, next_rotation_time
488 * could be more than INT_MAX msec in the future. In that case we'll
489 * wait no more than INT_MAX msec, and try again.
490 */
492 {
493 pg_time_t delay;
494
495 delay = next_rotation_time - now;
496 if (delay > 0)
497 {
498 if (delay > INT_MAX / 1000)
499 delay = INT_MAX / 1000;
500 cur_timeout = delay * 1000L; /* msec */
501 }
502 else
503 cur_timeout = 0;
504 }
505 else
506 cur_timeout = -1L;
507
508 /*
509 * Sleep until there's something to do
510 */
511#ifndef WIN32
512 rc = WaitEventSetWait(wes, cur_timeout, &event, 1,
513 WAIT_EVENT_SYSLOGGER_MAIN);
514
515 if (rc == 1 && event.events == WL_SOCKET_READABLE)
516 {
517 int bytesRead;
518
519 bytesRead = read(syslogPipe[0],
520 logbuffer + bytes_in_logbuffer,
521 sizeof(logbuffer) - bytes_in_logbuffer);
522 if (bytesRead < 0)
523 {
524 if (errno != EINTR)
525 ereport(LOG,
527 errmsg("could not read from logger pipe: %m")));
528 }
529 else if (bytesRead > 0)
530 {
531 bytes_in_logbuffer += bytesRead;
532 process_pipe_input(logbuffer, &bytes_in_logbuffer);
533 continue;
534 }
535 else
536 {
537 /*
538 * Zero bytes read when select() is saying read-ready means
539 * EOF on the pipe: that is, there are no longer any processes
540 * with the pipe write end open. Therefore, the postmaster
541 * and all backends are shut down, and we are done.
542 */
543 pipe_eof_seen = true;
544
545 /* if there's any data left then force it out now */
546 flush_pipe_input(logbuffer, &bytes_in_logbuffer);
547 }
548 }
549#else /* WIN32 */
550
551 /*
552 * On Windows we leave it to a separate thread to transfer data and
553 * detect pipe EOF. The main thread just wakes up to handle SIGHUP
554 * and rotation conditions.
555 *
556 * Server code isn't generally thread-safe, so we ensure that only one
557 * of the threads is active at a time by entering the critical section
558 * whenever we're not sleeping.
559 */
560 LeaveCriticalSection(&sysloggerSection);
561
562 (void) WaitEventSetWait(wes, cur_timeout, &event, 1,
563 WAIT_EVENT_SYSLOGGER_MAIN);
564
565 EnterCriticalSection(&sysloggerSection);
566#endif /* WIN32 */
567
568 if (pipe_eof_seen)
569 {
570 /*
571 * seeing this message on the real stderr is annoying - so we make
572 * it DEBUG1 to suppress in normal use.
573 */
575 (errmsg_internal("logger shutting down")));
576
577 /*
578 * Normal exit from the syslogger is here. Note that we
579 * deliberately do not close syslogFile before exiting; this is to
580 * allow for the possibility of elog messages being generated
581 * inside proc_exit. Regular exit() will take care of flushing
582 * and closing stdio channels.
583 */
584 proc_exit(0);
585 }
586 }
587}
sigset_t UnBlockSig
Definition: pqsignal.c:22
@ DestNone
Definition: dest.h:87
int errmsg_internal(const char *fmt,...)
Definition: elog.c:1161
#define DEBUG1
Definition: elog.h:30
#define elog(elevel,...)
Definition: elog.h:226
pg_time_t MyStartTime
Definition: globals.c:48
void ProcessConfigFile(GucContext context)
Definition: guc-file.l:120
@ PGC_SIGHUP
Definition: guc.h:75
#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
void ResetLatch(Latch *latch)
Definition: latch.c:374
char * pstrdup(const char *in)
Definition: mcxt.c:1759
MemoryContext PostmasterContext
Definition: mcxt.c:168
void MemoryContextDelete(MemoryContext context)
Definition: mcxt.c:469
BackendType MyBackendType
Definition: miscinit.c:64
#define pqsignal
Definition: port.h:531
#define DEVNULL
Definition: port.h:161
#define PGINVALID_SOCKET
Definition: port.h:31
#define pgoff_t
Definition: port.h:401
CommandDest whereToSendOutput
Definition: postgres.c:91
void init_ps_display(const char *fixed_part)
Definition: ps_status.c:285
uint32 events
Definition: waiteventset.h:62
static void logfile_rotate(bool time_based_rotation, int size_rotation_for)
Definition: syslogger.c:1363
static bool pipe_eof_seen
Definition: syslogger.c:82
#define READ_BUF_SIZE
Definition: syslogger.c:60
static void process_pipe_input(char *logbuffer, int *bytes_in_logbuffer)
Definition: syslogger.c:879
int Log_RotationSize
Definition: syslogger.c:72
static void sigUsr1Handler(SIGNAL_ARGS)
Definition: syslogger.c:1595
static void flush_pipe_input(char *logbuffer, int *bytes_in_logbuffer)
Definition: syslogger.c:1042
int AddWaitEventToSet(WaitEventSet *set, uint32 events, pgsocket fd, Latch *latch, void *user_data)
Definition: waiteventset.c:570
int WaitEventSetWait(WaitEventSet *set, long timeout, WaitEvent *occurred_events, int nevents, uint32 wait_event_info)
Definition: waiteventset.c:1038
WaitEventSet * CreateWaitEventSet(ResourceOwner resowner, int nevents)
Definition: waiteventset.c:364
#define WL_SOCKET_READABLE
Definition: waiteventset.h:35
#define WL_LATCH_SET
Definition: waiteventset.h:34
#define SIGCHLD
Definition: win32_port.h:168
#define SIGHUP
Definition: win32_port.h:158
#define EINTR
Definition: win32_port.h:364
#define SIGPIPE
Definition: win32_port.h:163
#define SIGQUIT
Definition: win32_port.h:159
#define ftello(stream)
Definition: win32_port.h:209
#define SIGUSR1
Definition: win32_port.h:170
#define SIGALRM
Definition: win32_port.h:164
#define SIGUSR2
Definition: win32_port.h:171

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(), ftello, 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, pgoff_t, 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(), 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 1477 of file syslogger.c.

1478{
1479 FILE *fh;
1480 mode_t oumask;
1481
1485 {
1486 if (unlink(LOG_METAINFO_DATAFILE) < 0 && errno != ENOENT)
1487 ereport(LOG,
1489 errmsg("could not remove file \"%s\": %m",
1491 return;
1492 }
1493
1494 /* use the same permissions as the data directory for the new file */
1495 oumask = umask(pg_mode_mask);
1496 fh = fopen(LOG_METAINFO_DATAFILE_TMP, "w");
1497 umask(oumask);
1498
1499 if (fh)
1500 {
1501 setvbuf(fh, NULL, PG_IOLBF, 0);
1502
1503#ifdef WIN32
1504 /* use CRLF line endings on Windows */
1505 _setmode(_fileno(fh), _O_TEXT);
1506#endif
1507 }
1508 else
1509 {
1510 ereport(LOG,
1512 errmsg("could not open file \"%s\": %m",
1514 return;
1515 }
1516
1518 {
1519 if (fprintf(fh, "stderr %s\n", last_sys_file_name) < 0)
1520 {
1521 ereport(LOG,
1523 errmsg("could not write file \"%s\": %m",
1525 fclose(fh);
1526 return;
1527 }
1528 }
1529
1531 {
1532 if (fprintf(fh, "csvlog %s\n", last_csv_file_name) < 0)
1533 {
1534 ereport(LOG,
1536 errmsg("could not write file \"%s\": %m",
1538 fclose(fh);
1539 return;
1540 }
1541 }
1542
1544 {
1545 if (fprintf(fh, "jsonlog %s\n", last_json_file_name) < 0)
1546 {
1547 ereport(LOG,
1549 errmsg("could not write file \"%s\": %m",
1551 fclose(fh);
1552 return;
1553 }
1554 }
1555 fclose(fh);
1556
1558 ereport(LOG,
1560 errmsg("could not rename file \"%s\" to \"%s\": %m",
1562}
#define fprintf(file, fmt, msg)
Definition: cubescan.l:21
int pg_mode_mask
Definition: file_perm.c:25
#define LOG_METAINFO_DATAFILE_TMP
Definition: syslogger.h:103
#define LOG_METAINFO_DATAFILE
Definition: syslogger.h:102

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 1093 of file syslogger.c.

1094{
1095 int rc;
1096 FILE *logfile;
1097
1098 /*
1099 * If we're told to write to a structured log file, but it's not open,
1100 * dump the data to syslogFile (which is always open) instead. This can
1101 * happen if structured output is enabled after postmaster start and we've
1102 * been unable to open logFile. There are also race conditions during a
1103 * parameter change whereby backends might send us structured output
1104 * before we open the logFile or after we close it. Writing formatted
1105 * output to the regular log file isn't great, but it beats dropping log
1106 * output on the floor.
1107 *
1108 * Think not to improve this by trying to open logFile on-the-fly. Any
1109 * failure in that would lead to recursion.
1110 */
1111 if ((destination & LOG_DESTINATION_CSVLOG) && csvlogFile != NULL)
1113 else if ((destination & LOG_DESTINATION_JSONLOG) && jsonlogFile != NULL)
1115 else
1117
1118 rc = fwrite(buffer, 1, count, logfile);
1119
1120 /*
1121 * Try to report any failure. We mustn't use ereport because it would
1122 * just recurse right back here, but write_stderr is OK: it will write
1123 * either to the postmaster's original stderr, or to /dev/null, but never
1124 * to our input pipe which would result in a different sort of looping.
1125 */
1126 if (rc != count)
1127 write_stderr("could not write to log file: %m\n");
1128}
#define write_stderr(str)
Definition: parallel.c:186
static FILE * logfile
Definition: pg_regress.c:126

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 110 of file syslogger.c.

Referenced by flush_pipe_input(), and process_pipe_input().

◆ csvlogFile

FILE* csvlogFile = NULL
static

Definition at line 85 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 87 of file syslogger.c.

Referenced by SysLogger_Start(), and SysLoggerMain().

◆ jsonlogFile

FILE* jsonlogFile = NULL
static

Definition at line 86 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 89 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 90 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 88 of file syslogger.c.

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

◆ Log_directory

char* Log_directory = NULL

Definition at line 73 of file syslogger.c.

Referenced by convert_and_check_filename(), logfile_getname(), pg_ls_logdir(), SysLogger_Start(), and SysLoggerMain().

◆ 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 LaunchMissingBackgroundProcesses(), pg_rotate_logfile(), PostmasterMain(), process_pm_child_exit(), and SysLogger_Start().

◆ next_rotation_time

pg_time_t next_rotation_time
static

Definition at line 81 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 82 of file syslogger.c.

Referenced by SysLoggerMain().

◆ rotation_disabled

bool rotation_disabled = false
static

Definition at line 83 of file syslogger.c.

Referenced by logfile_rotate_dest(), and SysLoggerMain().

◆ rotation_requested

volatile sig_atomic_t rotation_requested = false
static

Definition at line 127 of file syslogger.c.

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

◆ syslogFile

FILE* syslogFile = NULL
static

Definition at line 84 of file syslogger.c.

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

◆ syslogPipe

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

Definition at line 114 of file syslogger.c.

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

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