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syslogger.c
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1 /*-------------------------------------------------------------------------
2  *
3  * syslogger.c
4  *
5  * The system logger (syslogger) appeared in Postgres 8.0. It catches all
6  * stderr output from the postmaster, backends, and other subprocesses
7  * by redirecting to a pipe, and writes it to a set of logfiles.
8  * It's possible to have size and age limits for the logfile configured
9  * in postgresql.conf. If these limits are reached or passed, the
10  * current logfile is closed and a new one is created (rotated).
11  * The logfiles are stored in a subdirectory (configurable in
12  * postgresql.conf), using a user-selectable naming scheme.
13  *
14  * Author: Andreas Pflug <pgadmin@pse-consulting.de>
15  *
16  * Copyright (c) 2004-2020, PostgreSQL Global Development Group
17  *
18  *
19  * IDENTIFICATION
20  * src/backend/postmaster/syslogger.c
21  *
22  *-------------------------------------------------------------------------
23  */
24 #include "postgres.h"
25 
26 #include <fcntl.h>
27 #include <limits.h>
28 #include <signal.h>
29 #include <time.h>
30 #include <unistd.h>
31 #include <sys/stat.h>
32 #include <sys/time.h>
33 
34 #include "common/file_perm.h"
35 #include "lib/stringinfo.h"
36 #include "libpq/pqsignal.h"
37 #include "miscadmin.h"
38 #include "nodes/pg_list.h"
39 #include "pgstat.h"
40 #include "pgtime.h"
42 #include "postmaster/postmaster.h"
43 #include "postmaster/syslogger.h"
44 #include "storage/dsm.h"
45 #include "storage/fd.h"
46 #include "storage/ipc.h"
47 #include "storage/latch.h"
48 #include "storage/pg_shmem.h"
49 #include "tcop/tcopprot.h"
50 #include "utils/guc.h"
51 #include "utils/ps_status.h"
52 #include "utils/timestamp.h"
53 
54 /*
55  * We read() into a temp buffer twice as big as a chunk, so that any fragment
56  * left after processing can be moved down to the front and we'll still have
57  * room to read a full chunk.
58  */
59 #define READ_BUF_SIZE (2 * PIPE_CHUNK_SIZE)
60 
61 /* Log rotation signal file path, relative to $PGDATA */
62 #define LOGROTATE_SIGNAL_FILE "logrotate"
63 
64 
65 /*
66  * GUC parameters. Logging_collector cannot be changed after postmaster
67  * start, but the rest can change at SIGHUP.
68  */
69 bool Logging_collector = false;
71 int Log_RotationSize = 10 * 1024;
72 char *Log_directory = NULL;
73 char *Log_filename = NULL;
76 
77 extern bool redirection_done;
78 
79 /*
80  * Private state
81  */
83 static bool pipe_eof_seen = false;
84 static bool rotation_disabled = false;
85 static FILE *syslogFile = NULL;
86 static FILE *csvlogFile = NULL;
88 static char *last_file_name = NULL;
89 static char *last_csv_file_name = NULL;
90 
91 /*
92  * Buffers for saving partial messages from different backends.
93  *
94  * Keep NBUFFER_LISTS lists of these, with the entry for a given source pid
95  * being in the list numbered (pid % NBUFFER_LISTS), so as to cut down on
96  * the number of entries we have to examine for any one incoming message.
97  * There must never be more than one entry for the same source pid.
98  *
99  * An inactive buffer is not removed from its list, just held for re-use.
100  * An inactive buffer has pid == 0 and undefined contents of data.
101  */
102 typedef struct
103 {
104  int32 pid; /* PID of source process */
105  StringInfoData data; /* accumulated data, as a StringInfo */
106 } save_buffer;
107 
108 #define NBUFFER_LISTS 256
110 
111 /* These must be exported for EXEC_BACKEND case ... annoying */
112 #ifndef WIN32
113 int syslogPipe[2] = {-1, -1};
114 #else
115 HANDLE syslogPipe[2] = {0, 0};
116 #endif
117 
118 #ifdef WIN32
119 static HANDLE threadHandle = 0;
120 static CRITICAL_SECTION sysloggerSection;
121 #endif
122 
123 /*
124  * Flags set by interrupt handlers for later service in the main loop.
125  */
126 static volatile sig_atomic_t got_SIGHUP = false;
127 static volatile sig_atomic_t rotation_requested = false;
128 
129 
130 /* Local subroutines */
131 #ifdef EXEC_BACKEND
132 static pid_t syslogger_forkexec(void);
133 static void syslogger_parseArgs(int argc, char *argv[]);
134 #endif
135 NON_EXEC_STATIC void SysLoggerMain(int argc, char *argv[]) pg_attribute_noreturn();
136 static void process_pipe_input(char *logbuffer, int *bytes_in_logbuffer);
137 static void flush_pipe_input(char *logbuffer, int *bytes_in_logbuffer);
138 static FILE *logfile_open(const char *filename, const char *mode,
139  bool allow_errors);
140 
141 #ifdef WIN32
142 static unsigned int __stdcall pipeThread(void *arg);
143 #endif
144 static void logfile_rotate(bool time_based_rotation, int size_rotation_for);
145 static char *logfile_getname(pg_time_t timestamp, const char *suffix);
146 static void set_next_rotation_time(void);
147 static void sigHupHandler(SIGNAL_ARGS);
148 static void sigUsr1Handler(SIGNAL_ARGS);
149 static void update_metainfo_datafile(void);
150 
151 
152 /*
153  * Main entry point for syslogger process
154  * argc/argv parameters are valid only in EXEC_BACKEND case.
155  */
156 NON_EXEC_STATIC void
157 SysLoggerMain(int argc, char *argv[])
158 {
159 #ifndef WIN32
160  char logbuffer[READ_BUF_SIZE];
161  int bytes_in_logbuffer = 0;
162 #endif
163  char *currentLogDir;
164  char *currentLogFilename;
165  int currentLogRotationAge;
166  pg_time_t now;
167  WaitEventSet *wes;
168 
169  now = MyStartTime;
170 
171 #ifdef EXEC_BACKEND
172  syslogger_parseArgs(argc, argv);
173 #endif /* EXEC_BACKEND */
174 
176  init_ps_display(NULL);
177 
178  /*
179  * If we restarted, our stderr is already redirected into our own input
180  * pipe. This is of course pretty useless, not to mention that it
181  * interferes with detecting pipe EOF. Point stderr to /dev/null. This
182  * assumes that all interesting messages generated in the syslogger will
183  * come through elog.c and will be sent to write_syslogger_file.
184  */
185  if (redirection_done)
186  {
187  int fd = open(DEVNULL, O_WRONLY, 0);
188 
189  /*
190  * The closes might look redundant, but they are not: we want to be
191  * darn sure the pipe gets closed even if the open failed. We can
192  * survive running with stderr pointing nowhere, but we can't afford
193  * to have extra pipe input descriptors hanging around.
194  *
195  * As we're just trying to reset these to go to DEVNULL, there's not
196  * much point in checking for failure from the close/dup2 calls here,
197  * if they fail then presumably the file descriptors are closed and
198  * any writes will go into the bitbucket anyway.
199  */
200  close(fileno(stdout));
201  close(fileno(stderr));
202  if (fd != -1)
203  {
204  (void) dup2(fd, fileno(stdout));
205  (void) dup2(fd, fileno(stderr));
206  close(fd);
207  }
208  }
209 
210  /*
211  * Syslogger's own stderr can't be the syslogPipe, so set it back to text
212  * mode if we didn't just close it. (It was set to binary in
213  * SubPostmasterMain).
214  */
215 #ifdef WIN32
216  else
217  _setmode(_fileno(stderr), _O_TEXT);
218 #endif
219 
220  /*
221  * Also close our copy of the write end of the pipe. This is needed to
222  * ensure we can detect pipe EOF correctly. (But note that in the restart
223  * case, the postmaster already did this.)
224  */
225 #ifndef WIN32
226  if (syslogPipe[1] >= 0)
227  close(syslogPipe[1]);
228  syslogPipe[1] = -1;
229 #else
230  if (syslogPipe[1])
231  CloseHandle(syslogPipe[1]);
232  syslogPipe[1] = 0;
233 #endif
234 
235  /*
236  * Properly accept or ignore signals the postmaster might send us
237  *
238  * Note: we ignore all termination signals, and instead exit only when all
239  * upstream processes are gone, to ensure we don't miss any dying gasps of
240  * broken backends...
241  */
242 
243  pqsignal(SIGHUP, sigHupHandler); /* set flag to read config file */
244  pqsignal(SIGINT, SIG_IGN);
245  pqsignal(SIGTERM, SIG_IGN);
249  pqsignal(SIGUSR1, sigUsr1Handler); /* request log rotation */
251 
252  /*
253  * Reset some signals that are accepted by postmaster but not here
254  */
256 
258 
259 #ifdef WIN32
260  /* Fire up separate data transfer thread */
261  InitializeCriticalSection(&sysloggerSection);
262  EnterCriticalSection(&sysloggerSection);
263 
264  threadHandle = (HANDLE) _beginthreadex(NULL, 0, pipeThread, NULL, 0, NULL);
265  if (threadHandle == 0)
266  elog(FATAL, "could not create syslogger data transfer thread: %m");
267 #endif /* WIN32 */
268 
269  /*
270  * Remember active logfiles' name(s). We recompute 'em from the reference
271  * time because passing down just the pg_time_t is a lot cheaper than
272  * passing a whole file path in the EXEC_BACKEND case.
273  */
275  if (csvlogFile != NULL)
277 
278  /* remember active logfile parameters */
279  currentLogDir = pstrdup(Log_directory);
280  currentLogFilename = pstrdup(Log_filename);
281  currentLogRotationAge = Log_RotationAge;
282  /* set next planned rotation time */
285 
286  /*
287  * Reset whereToSendOutput, as the postmaster will do (but hasn't yet, at
288  * the point where we forked). This prevents duplicate output of messages
289  * from syslogger itself.
290  */
292 
293  /*
294  * Set up a reusable WaitEventSet object we'll use to wait for our latch,
295  * and (except on Windows) our socket.
296  *
297  * Unlike all other postmaster child processes, we'll ignore postmaster
298  * death because we want to collect final log output from all backends and
299  * then exit last. We'll do that by running until we see EOF on the
300  * syslog pipe, which implies that all other backends have exited
301  * (including the postmaster).
302  */
305 #ifndef WIN32
306  AddWaitEventToSet(wes, WL_SOCKET_READABLE, syslogPipe[0], NULL, NULL);
307 #endif
308 
309  /* main worker loop */
310  for (;;)
311  {
312  bool time_based_rotation = false;
313  int size_rotation_for = 0;
314  long cur_timeout;
315  WaitEvent event;
316 
317 #ifndef WIN32
318  int rc;
319 #endif
320 
321  /* Clear any already-pending wakeups */
323 
324  /*
325  * Process any requests or signals received recently.
326  */
327  if (got_SIGHUP)
328  {
329  got_SIGHUP = false;
331 
332  /*
333  * Check if the log directory or filename pattern changed in
334  * postgresql.conf. If so, force rotation to make sure we're
335  * writing the logfiles in the right place.
336  */
337  if (strcmp(Log_directory, currentLogDir) != 0)
338  {
339  pfree(currentLogDir);
340  currentLogDir = pstrdup(Log_directory);
341  rotation_requested = true;
342 
343  /*
344  * Also, create new directory if not present; ignore errors
345  */
347  }
348  if (strcmp(Log_filename, currentLogFilename) != 0)
349  {
350  pfree(currentLogFilename);
351  currentLogFilename = pstrdup(Log_filename);
352  rotation_requested = true;
353  }
354 
355  /*
356  * Force a rotation if CSVLOG output was just turned on or off and
357  * we need to open or close csvlogFile accordingly.
358  */
359  if (((Log_destination & LOG_DESTINATION_CSVLOG) != 0) !=
360  (csvlogFile != NULL))
361  rotation_requested = true;
362 
363  /*
364  * If rotation time parameter changed, reset next rotation time,
365  * but don't immediately force a rotation.
366  */
367  if (currentLogRotationAge != Log_RotationAge)
368  {
369  currentLogRotationAge = Log_RotationAge;
371  }
372 
373  /*
374  * If we had a rotation-disabling failure, re-enable rotation
375  * attempts after SIGHUP, and force one immediately.
376  */
377  if (rotation_disabled)
378  {
379  rotation_disabled = false;
380  rotation_requested = true;
381  }
382 
383  /*
384  * Force rewriting last log filename when reloading configuration.
385  * Even if rotation_requested is false, log_destination may have
386  * been changed and we don't want to wait the next file rotation.
387  */
389  }
390 
392  {
393  /* Do a logfile rotation if it's time */
394  now = (pg_time_t) time(NULL);
395  if (now >= next_rotation_time)
396  rotation_requested = time_based_rotation = true;
397  }
398 
400  {
401  /* Do a rotation if file is too big */
402  if (ftell(syslogFile) >= Log_RotationSize * 1024L)
403  {
404  rotation_requested = true;
405  size_rotation_for |= LOG_DESTINATION_STDERR;
406  }
407  if (csvlogFile != NULL &&
408  ftell(csvlogFile) >= Log_RotationSize * 1024L)
409  {
410  rotation_requested = true;
411  size_rotation_for |= LOG_DESTINATION_CSVLOG;
412  }
413  }
414 
415  if (rotation_requested)
416  {
417  /*
418  * Force rotation when both values are zero. It means the request
419  * was sent by pg_rotate_logfile() or "pg_ctl logrotate".
420  */
421  if (!time_based_rotation && size_rotation_for == 0)
422  size_rotation_for = LOG_DESTINATION_STDERR | LOG_DESTINATION_CSVLOG;
423  logfile_rotate(time_based_rotation, size_rotation_for);
424  }
425 
426  /*
427  * Calculate time till next time-based rotation, so that we don't
428  * sleep longer than that. We assume the value of "now" obtained
429  * above is still close enough. Note we can't make this calculation
430  * until after calling logfile_rotate(), since it will advance
431  * next_rotation_time.
432  *
433  * Also note that we need to beware of overflow in calculation of the
434  * timeout: with large settings of Log_RotationAge, next_rotation_time
435  * could be more than INT_MAX msec in the future. In that case we'll
436  * wait no more than INT_MAX msec, and try again.
437  */
439  {
440  pg_time_t delay;
441 
442  delay = next_rotation_time - now;
443  if (delay > 0)
444  {
445  if (delay > INT_MAX / 1000)
446  delay = INT_MAX / 1000;
447  cur_timeout = delay * 1000L; /* msec */
448  }
449  else
450  cur_timeout = 0;
451  }
452  else
453  cur_timeout = -1L;
454 
455  /*
456  * Sleep until there's something to do
457  */
458 #ifndef WIN32
459  rc = WaitEventSetWait(wes, cur_timeout, &event, 1,
461 
462  if (rc == 1 && event.events == WL_SOCKET_READABLE)
463  {
464  int bytesRead;
465 
466  bytesRead = read(syslogPipe[0],
467  logbuffer + bytes_in_logbuffer,
468  sizeof(logbuffer) - bytes_in_logbuffer);
469  if (bytesRead < 0)
470  {
471  if (errno != EINTR)
472  ereport(LOG,
474  errmsg("could not read from logger pipe: %m")));
475  }
476  else if (bytesRead > 0)
477  {
478  bytes_in_logbuffer += bytesRead;
479  process_pipe_input(logbuffer, &bytes_in_logbuffer);
480  continue;
481  }
482  else
483  {
484  /*
485  * Zero bytes read when select() is saying read-ready means
486  * EOF on the pipe: that is, there are no longer any processes
487  * with the pipe write end open. Therefore, the postmaster
488  * and all backends are shut down, and we are done.
489  */
490  pipe_eof_seen = true;
491 
492  /* if there's any data left then force it out now */
493  flush_pipe_input(logbuffer, &bytes_in_logbuffer);
494  }
495  }
496 #else /* WIN32 */
497 
498  /*
499  * On Windows we leave it to a separate thread to transfer data and
500  * detect pipe EOF. The main thread just wakes up to handle SIGHUP
501  * and rotation conditions.
502  *
503  * Server code isn't generally thread-safe, so we ensure that only one
504  * of the threads is active at a time by entering the critical section
505  * whenever we're not sleeping.
506  */
507  LeaveCriticalSection(&sysloggerSection);
508 
509  (void) WaitEventSetWait(wes, cur_timeout, &event, 1,
511 
512  EnterCriticalSection(&sysloggerSection);
513 #endif /* WIN32 */
514 
515  if (pipe_eof_seen)
516  {
517  /*
518  * seeing this message on the real stderr is annoying - so we make
519  * it DEBUG1 to suppress in normal use.
520  */
521  ereport(DEBUG1,
522  (errmsg("logger shutting down")));
523 
524  /*
525  * Normal exit from the syslogger is here. Note that we
526  * deliberately do not close syslogFile before exiting; this is to
527  * allow for the possibility of elog messages being generated
528  * inside proc_exit. Regular exit() will take care of flushing
529  * and closing stdio channels.
530  */
531  proc_exit(0);
532  }
533  }
534 }
535 
536 /*
537  * Postmaster subroutine to start a syslogger subprocess.
538  */
539 int
541 {
542  pid_t sysloggerPid;
543  char *filename;
544 
545  if (!Logging_collector)
546  return 0;
547 
548  /*
549  * If first time through, create the pipe which will receive stderr
550  * output.
551  *
552  * If the syslogger crashes and needs to be restarted, we continue to use
553  * the same pipe (indeed must do so, since extant backends will be writing
554  * into that pipe).
555  *
556  * This means the postmaster must continue to hold the read end of the
557  * pipe open, so we can pass it down to the reincarnated syslogger. This
558  * is a bit klugy but we have little choice.
559  *
560  * Also note that we don't bother counting the pipe FDs by calling
561  * Reserve/ReleaseExternalFD. There's no real need to account for them
562  * accurately in the postmaster or syslogger process, and both ends of the
563  * pipe will wind up closed in all other postmaster children.
564  */
565 #ifndef WIN32
566  if (syslogPipe[0] < 0)
567  {
568  if (pipe(syslogPipe) < 0)
569  ereport(FATAL,
571  errmsg("could not create pipe for syslog: %m")));
572  }
573 #else
574  if (!syslogPipe[0])
575  {
576  SECURITY_ATTRIBUTES sa;
577 
578  memset(&sa, 0, sizeof(SECURITY_ATTRIBUTES));
579  sa.nLength = sizeof(SECURITY_ATTRIBUTES);
580  sa.bInheritHandle = TRUE;
581 
582  if (!CreatePipe(&syslogPipe[0], &syslogPipe[1], &sa, 32768))
583  ereport(FATAL,
585  errmsg("could not create pipe for syslog: %m")));
586  }
587 #endif
588 
589  /*
590  * Create log directory if not present; ignore errors
591  */
593 
594  /*
595  * The initial logfile is created right in the postmaster, to verify that
596  * the Log_directory is writable. We save the reference time so that the
597  * syslogger child process can recompute this file name.
598  *
599  * It might look a bit strange to re-do this during a syslogger restart,
600  * but we must do so since the postmaster closed syslogFile after the
601  * previous fork (and remembering that old file wouldn't be right anyway).
602  * Note we always append here, we won't overwrite any existing file. This
603  * is consistent with the normal rules, because by definition this is not
604  * a time-based rotation.
605  */
606  first_syslogger_file_time = time(NULL);
607 
608  filename = logfile_getname(first_syslogger_file_time, NULL);
609 
610  syslogFile = logfile_open(filename, "a", false);
611 
612  pfree(filename);
613 
614  /*
615  * Likewise for the initial CSV log file, if that's enabled. (Note that
616  * we open syslogFile even when only CSV output is nominally enabled,
617  * since some code paths will write to syslogFile anyway.)
618  */
620  {
621  filename = logfile_getname(first_syslogger_file_time, ".csv");
622 
623  csvlogFile = logfile_open(filename, "a", false);
624 
625  pfree(filename);
626  }
627 
628 #ifdef EXEC_BACKEND
629  switch ((sysloggerPid = syslogger_forkexec()))
630 #else
631  switch ((sysloggerPid = fork_process()))
632 #endif
633  {
634  case -1:
635  ereport(LOG,
636  (errmsg("could not fork system logger: %m")));
637  return 0;
638 
639 #ifndef EXEC_BACKEND
640  case 0:
641  /* in postmaster child ... */
643 
644  /* Close the postmaster's sockets */
645  ClosePostmasterPorts(true);
646 
647  /* Drop our connection to postmaster's shared memory, as well */
648  dsm_detach_all();
650 
651  /* do the work */
652  SysLoggerMain(0, NULL);
653  break;
654 #endif
655 
656  default:
657  /* success, in postmaster */
658 
659  /* now we redirect stderr, if not done already */
660  if (!redirection_done)
661  {
662 #ifdef WIN32
663  int fd;
664 #endif
665 
666  /*
667  * Leave a breadcrumb trail when redirecting, in case the user
668  * forgets that redirection is active and looks only at the
669  * original stderr target file.
670  */
671  ereport(LOG,
672  (errmsg("redirecting log output to logging collector process"),
673  errhint("Future log output will appear in directory \"%s\".",
674  Log_directory)));
675 
676 #ifndef WIN32
677  fflush(stdout);
678  if (dup2(syslogPipe[1], fileno(stdout)) < 0)
679  ereport(FATAL,
681  errmsg("could not redirect stdout: %m")));
682  fflush(stderr);
683  if (dup2(syslogPipe[1], fileno(stderr)) < 0)
684  ereport(FATAL,
686  errmsg("could not redirect stderr: %m")));
687  /* Now we are done with the write end of the pipe. */
688  close(syslogPipe[1]);
689  syslogPipe[1] = -1;
690 #else
691 
692  /*
693  * open the pipe in binary mode and make sure stderr is binary
694  * after it's been dup'ed into, to avoid disturbing the pipe
695  * chunking protocol.
696  */
697  fflush(stderr);
698  fd = _open_osfhandle((intptr_t) syslogPipe[1],
699  _O_APPEND | _O_BINARY);
700  if (dup2(fd, _fileno(stderr)) < 0)
701  ereport(FATAL,
703  errmsg("could not redirect stderr: %m")));
704  close(fd);
705  _setmode(_fileno(stderr), _O_BINARY);
706 
707  /*
708  * Now we are done with the write end of the pipe.
709  * CloseHandle() must not be called because the preceding
710  * close() closes the underlying handle.
711  */
712  syslogPipe[1] = 0;
713 #endif
714  redirection_done = true;
715  }
716 
717  /* postmaster will never write the file(s); close 'em */
718  fclose(syslogFile);
719  syslogFile = NULL;
720  if (csvlogFile != NULL)
721  {
722  fclose(csvlogFile);
723  csvlogFile = NULL;
724  }
725  return (int) sysloggerPid;
726  }
727 
728  /* we should never reach here */
729  return 0;
730 }
731 
732 
733 #ifdef EXEC_BACKEND
734 
735 /*
736  * syslogger_forkexec() -
737  *
738  * Format up the arglist for, then fork and exec, a syslogger process
739  */
740 static pid_t
741 syslogger_forkexec(void)
742 {
743  char *av[10];
744  int ac = 0;
745  char filenobuf[32];
746  char csvfilenobuf[32];
747 
748  av[ac++] = "postgres";
749  av[ac++] = "--forklog";
750  av[ac++] = NULL; /* filled in by postmaster_forkexec */
751 
752  /* static variables (those not passed by write_backend_variables) */
753 #ifndef WIN32
754  if (syslogFile != NULL)
755  snprintf(filenobuf, sizeof(filenobuf), "%d",
756  fileno(syslogFile));
757  else
758  strcpy(filenobuf, "-1");
759 #else /* WIN32 */
760  if (syslogFile != NULL)
761  snprintf(filenobuf, sizeof(filenobuf), "%ld",
762  (long) _get_osfhandle(_fileno(syslogFile)));
763  else
764  strcpy(filenobuf, "0");
765 #endif /* WIN32 */
766  av[ac++] = filenobuf;
767 
768 #ifndef WIN32
769  if (csvlogFile != NULL)
770  snprintf(csvfilenobuf, sizeof(csvfilenobuf), "%d",
771  fileno(csvlogFile));
772  else
773  strcpy(csvfilenobuf, "-1");
774 #else /* WIN32 */
775  if (csvlogFile != NULL)
776  snprintf(csvfilenobuf, sizeof(csvfilenobuf), "%ld",
777  (long) _get_osfhandle(_fileno(csvlogFile)));
778  else
779  strcpy(csvfilenobuf, "0");
780 #endif /* WIN32 */
781  av[ac++] = csvfilenobuf;
782 
783  av[ac] = NULL;
784  Assert(ac < lengthof(av));
785 
786  return postmaster_forkexec(ac, av);
787 }
788 
789 /*
790  * syslogger_parseArgs() -
791  *
792  * Extract data from the arglist for exec'ed syslogger process
793  */
794 static void
795 syslogger_parseArgs(int argc, char *argv[])
796 {
797  int fd;
798 
799  Assert(argc == 5);
800  argv += 3;
801 
802  /*
803  * Re-open the error output files that were opened by SysLogger_Start().
804  *
805  * We expect this will always succeed, which is too optimistic, but if it
806  * fails there's not a lot we can do to report the problem anyway. As
807  * coded, we'll just crash on a null pointer dereference after failure...
808  */
809 #ifndef WIN32
810  fd = atoi(*argv++);
811  if (fd != -1)
812  {
813  syslogFile = fdopen(fd, "a");
814  setvbuf(syslogFile, NULL, PG_IOLBF, 0);
815  }
816  fd = atoi(*argv++);
817  if (fd != -1)
818  {
819  csvlogFile = fdopen(fd, "a");
820  setvbuf(csvlogFile, NULL, PG_IOLBF, 0);
821  }
822 #else /* WIN32 */
823  fd = atoi(*argv++);
824  if (fd != 0)
825  {
826  fd = _open_osfhandle(fd, _O_APPEND | _O_TEXT);
827  if (fd > 0)
828  {
829  syslogFile = fdopen(fd, "a");
830  setvbuf(syslogFile, NULL, PG_IOLBF, 0);
831  }
832  }
833  fd = atoi(*argv++);
834  if (fd != 0)
835  {
836  fd = _open_osfhandle(fd, _O_APPEND | _O_TEXT);
837  if (fd > 0)
838  {
839  csvlogFile = fdopen(fd, "a");
840  setvbuf(csvlogFile, NULL, PG_IOLBF, 0);
841  }
842  }
843 #endif /* WIN32 */
844 }
845 #endif /* EXEC_BACKEND */
846 
847 
848 /* --------------------------------
849  * pipe protocol handling
850  * --------------------------------
851  */
852 
853 /*
854  * Process data received through the syslogger pipe.
855  *
856  * This routine interprets the log pipe protocol which sends log messages as
857  * (hopefully atomic) chunks - such chunks are detected and reassembled here.
858  *
859  * The protocol has a header that starts with two nul bytes, then has a 16 bit
860  * length, the pid of the sending process, and a flag to indicate if it is
861  * the last chunk in a message. Incomplete chunks are saved until we read some
862  * more, and non-final chunks are accumulated until we get the final chunk.
863  *
864  * All of this is to avoid 2 problems:
865  * . partial messages being written to logfiles (messes rotation), and
866  * . messages from different backends being interleaved (messages garbled).
867  *
868  * Any non-protocol messages are written out directly. These should only come
869  * from non-PostgreSQL sources, however (e.g. third party libraries writing to
870  * stderr).
871  *
872  * logbuffer is the data input buffer, and *bytes_in_logbuffer is the number
873  * of bytes present. On exit, any not-yet-eaten data is left-justified in
874  * logbuffer, and *bytes_in_logbuffer is updated.
875  */
876 static void
877 process_pipe_input(char *logbuffer, int *bytes_in_logbuffer)
878 {
879  char *cursor = logbuffer;
880  int count = *bytes_in_logbuffer;
882 
883  /* While we have enough for a header, process data... */
884  while (count >= (int) (offsetof(PipeProtoHeader, data) + 1))
885  {
886  PipeProtoHeader p;
887  int chunklen;
888 
889  /* Do we have a valid header? */
890  memcpy(&p, cursor, offsetof(PipeProtoHeader, data));
891  if (p.nuls[0] == '\0' && p.nuls[1] == '\0' &&
892  p.len > 0 && p.len <= PIPE_MAX_PAYLOAD &&
893  p.pid != 0 &&
894  (p.is_last == 't' || p.is_last == 'f' ||
895  p.is_last == 'T' || p.is_last == 'F'))
896  {
897  List *buffer_list;
898  ListCell *cell;
899  save_buffer *existing_slot = NULL,
900  *free_slot = NULL;
901  StringInfo str;
902 
903  chunklen = PIPE_HEADER_SIZE + p.len;
904 
905  /* Fall out of loop if we don't have the whole chunk yet */
906  if (count < chunklen)
907  break;
908 
909  dest = (p.is_last == 'T' || p.is_last == 'F') ?
911 
912  /* Locate any existing buffer for this source pid */
913  buffer_list = buffer_lists[p.pid % NBUFFER_LISTS];
914  foreach(cell, buffer_list)
915  {
916  save_buffer *buf = (save_buffer *) lfirst(cell);
917 
918  if (buf->pid == p.pid)
919  {
920  existing_slot = buf;
921  break;
922  }
923  if (buf->pid == 0 && free_slot == NULL)
924  free_slot = buf;
925  }
926 
927  if (p.is_last == 'f' || p.is_last == 'F')
928  {
929  /*
930  * Save a complete non-final chunk in a per-pid buffer
931  */
932  if (existing_slot != NULL)
933  {
934  /* Add chunk to data from preceding chunks */
935  str = &(existing_slot->data);
937  cursor + PIPE_HEADER_SIZE,
938  p.len);
939  }
940  else
941  {
942  /* First chunk of message, save in a new buffer */
943  if (free_slot == NULL)
944  {
945  /*
946  * Need a free slot, but there isn't one in the list,
947  * so create a new one and extend the list with it.
948  */
949  free_slot = palloc(sizeof(save_buffer));
950  buffer_list = lappend(buffer_list, free_slot);
951  buffer_lists[p.pid % NBUFFER_LISTS] = buffer_list;
952  }
953  free_slot->pid = p.pid;
954  str = &(free_slot->data);
955  initStringInfo(str);
957  cursor + PIPE_HEADER_SIZE,
958  p.len);
959  }
960  }
961  else
962  {
963  /*
964  * Final chunk --- add it to anything saved for that pid, and
965  * either way write the whole thing out.
966  */
967  if (existing_slot != NULL)
968  {
969  str = &(existing_slot->data);
971  cursor + PIPE_HEADER_SIZE,
972  p.len);
973  write_syslogger_file(str->data, str->len, dest);
974  /* Mark the buffer unused, and reclaim string storage */
975  existing_slot->pid = 0;
976  pfree(str->data);
977  }
978  else
979  {
980  /* The whole message was one chunk, evidently. */
982  dest);
983  }
984  }
985 
986  /* Finished processing this chunk */
987  cursor += chunklen;
988  count -= chunklen;
989  }
990  else
991  {
992  /* Process non-protocol data */
993 
994  /*
995  * Look for the start of a protocol header. If found, dump data
996  * up to there and repeat the loop. Otherwise, dump it all and
997  * fall out of the loop. (Note: we want to dump it all if at all
998  * possible, so as to avoid dividing non-protocol messages across
999  * logfiles. We expect that in many scenarios, a non-protocol
1000  * message will arrive all in one read(), and we want to respect
1001  * the read() boundary if possible.)
1002  */
1003  for (chunklen = 1; chunklen < count; chunklen++)
1004  {
1005  if (cursor[chunklen] == '\0')
1006  break;
1007  }
1008  /* fall back on the stderr log as the destination */
1009  write_syslogger_file(cursor, chunklen, LOG_DESTINATION_STDERR);
1010  cursor += chunklen;
1011  count -= chunklen;
1012  }
1013  }
1014 
1015  /* We don't have a full chunk, so left-align what remains in the buffer */
1016  if (count > 0 && cursor != logbuffer)
1017  memmove(logbuffer, cursor, count);
1018  *bytes_in_logbuffer = count;
1019 }
1020 
1021 /*
1022  * Force out any buffered data
1023  *
1024  * This is currently used only at syslogger shutdown, but could perhaps be
1025  * useful at other times, so it is careful to leave things in a clean state.
1026  */
1027 static void
1028 flush_pipe_input(char *logbuffer, int *bytes_in_logbuffer)
1029 {
1030  int i;
1031 
1032  /* Dump any incomplete protocol messages */
1033  for (i = 0; i < NBUFFER_LISTS; i++)
1034  {
1035  List *list = buffer_lists[i];
1036  ListCell *cell;
1037 
1038  foreach(cell, list)
1039  {
1040  save_buffer *buf = (save_buffer *) lfirst(cell);
1041 
1042  if (buf->pid != 0)
1043  {
1044  StringInfo str = &(buf->data);
1045 
1046  write_syslogger_file(str->data, str->len,
1048  /* Mark the buffer unused, and reclaim string storage */
1049  buf->pid = 0;
1050  pfree(str->data);
1051  }
1052  }
1053  }
1054 
1055  /*
1056  * Force out any remaining pipe data as-is; we don't bother trying to
1057  * remove any protocol headers that may exist in it.
1058  */
1059  if (*bytes_in_logbuffer > 0)
1060  write_syslogger_file(logbuffer, *bytes_in_logbuffer,
1062  *bytes_in_logbuffer = 0;
1063 }
1064 
1065 
1066 /* --------------------------------
1067  * logfile routines
1068  * --------------------------------
1069  */
1070 
1071 /*
1072  * Write text to the currently open logfile
1073  *
1074  * This is exported so that elog.c can call it when MyBackendType is B_LOGGER.
1075  * This allows the syslogger process to record elog messages of its own,
1076  * even though its stderr does not point at the syslog pipe.
1077  */
1078 void
1079 write_syslogger_file(const char *buffer, int count, int destination)
1080 {
1081  int rc;
1082  FILE *logfile;
1083 
1084  /*
1085  * If we're told to write to csvlogFile, but it's not open, dump the data
1086  * to syslogFile (which is always open) instead. This can happen if CSV
1087  * output is enabled after postmaster start and we've been unable to open
1088  * csvlogFile. There are also race conditions during a parameter change
1089  * whereby backends might send us CSV output before we open csvlogFile or
1090  * after we close it. Writing CSV-formatted output to the regular log
1091  * file isn't great, but it beats dropping log output on the floor.
1092  *
1093  * Think not to improve this by trying to open csvlogFile on-the-fly. Any
1094  * failure in that would lead to recursion.
1095  */
1096  logfile = (destination == LOG_DESTINATION_CSVLOG &&
1097  csvlogFile != NULL) ? csvlogFile : syslogFile;
1098 
1099  rc = fwrite(buffer, 1, count, logfile);
1100 
1101  /*
1102  * Try to report any failure. We mustn't use ereport because it would
1103  * just recurse right back here, but write_stderr is OK: it will write
1104  * either to the postmaster's original stderr, or to /dev/null, but never
1105  * to our input pipe which would result in a different sort of looping.
1106  */
1107  if (rc != count)
1108  write_stderr("could not write to log file: %s\n", strerror(errno));
1109 }
1110 
1111 #ifdef WIN32
1112 
1113 /*
1114  * Worker thread to transfer data from the pipe to the current logfile.
1115  *
1116  * We need this because on Windows, WaitForMultipleObjects does not work on
1117  * unnamed pipes: it always reports "signaled", so the blocking ReadFile won't
1118  * allow for SIGHUP; and select is for sockets only.
1119  */
1120 static unsigned int __stdcall
1121 pipeThread(void *arg)
1122 {
1123  char logbuffer[READ_BUF_SIZE];
1124  int bytes_in_logbuffer = 0;
1125 
1126  for (;;)
1127  {
1128  DWORD bytesRead;
1129  BOOL result;
1130 
1131  result = ReadFile(syslogPipe[0],
1132  logbuffer + bytes_in_logbuffer,
1133  sizeof(logbuffer) - bytes_in_logbuffer,
1134  &bytesRead, 0);
1135 
1136  /*
1137  * Enter critical section before doing anything that might touch
1138  * global state shared by the main thread. Anything that uses
1139  * palloc()/pfree() in particular are not safe outside the critical
1140  * section.
1141  */
1142  EnterCriticalSection(&sysloggerSection);
1143  if (!result)
1144  {
1145  DWORD error = GetLastError();
1146 
1147  if (error == ERROR_HANDLE_EOF ||
1148  error == ERROR_BROKEN_PIPE)
1149  break;
1150  _dosmaperr(error);
1151  ereport(LOG,
1153  errmsg("could not read from logger pipe: %m")));
1154  }
1155  else if (bytesRead > 0)
1156  {
1157  bytes_in_logbuffer += bytesRead;
1158  process_pipe_input(logbuffer, &bytes_in_logbuffer);
1159  }
1160 
1161  /*
1162  * If we've filled the current logfile, nudge the main thread to do a
1163  * log rotation.
1164  */
1165  if (Log_RotationSize > 0)
1166  {
1167  if (ftell(syslogFile) >= Log_RotationSize * 1024L ||
1168  (csvlogFile != NULL && ftell(csvlogFile) >= Log_RotationSize * 1024L))
1169  SetLatch(MyLatch);
1170  }
1171  LeaveCriticalSection(&sysloggerSection);
1172  }
1173 
1174  /* We exit the above loop only upon detecting pipe EOF */
1175  pipe_eof_seen = true;
1176 
1177  /* if there's any data left then force it out now */
1178  flush_pipe_input(logbuffer, &bytes_in_logbuffer);
1179 
1180  /* set the latch to waken the main thread, which will quit */
1181  SetLatch(MyLatch);
1182 
1183  LeaveCriticalSection(&sysloggerSection);
1184  _endthread();
1185  return 0;
1186 }
1187 #endif /* WIN32 */
1188 
1189 /*
1190  * Open a new logfile with proper permissions and buffering options.
1191  *
1192  * If allow_errors is true, we just log any open failure and return NULL
1193  * (with errno still correct for the fopen failure).
1194  * Otherwise, errors are treated as fatal.
1195  */
1196 static FILE *
1197 logfile_open(const char *filename, const char *mode, bool allow_errors)
1198 {
1199  FILE *fh;
1200  mode_t oumask;
1201 
1202  /*
1203  * Note we do not let Log_file_mode disable IWUSR, since we certainly want
1204  * to be able to write the files ourselves.
1205  */
1206  oumask = umask((mode_t) ((~(Log_file_mode | S_IWUSR)) & (S_IRWXU | S_IRWXG | S_IRWXO)));
1207  fh = fopen(filename, mode);
1208  umask(oumask);
1209 
1210  if (fh)
1211  {
1212  setvbuf(fh, NULL, PG_IOLBF, 0);
1213 
1214 #ifdef WIN32
1215  /* use CRLF line endings on Windows */
1216  _setmode(_fileno(fh), _O_TEXT);
1217 #endif
1218  }
1219  else
1220  {
1221  int save_errno = errno;
1222 
1223  ereport(allow_errors ? LOG : FATAL,
1225  errmsg("could not open log file \"%s\": %m",
1226  filename)));
1227  errno = save_errno;
1228  }
1229 
1230  return fh;
1231 }
1232 
1233 /*
1234  * perform logfile rotation
1235  */
1236 static void
1237 logfile_rotate(bool time_based_rotation, int size_rotation_for)
1238 {
1239  char *filename;
1240  char *csvfilename = NULL;
1241  pg_time_t fntime;
1242  FILE *fh;
1243 
1244  rotation_requested = false;
1245 
1246  /*
1247  * When doing a time-based rotation, invent the new logfile name based on
1248  * the planned rotation time, not current time, to avoid "slippage" in the
1249  * file name when we don't do the rotation immediately.
1250  */
1251  if (time_based_rotation)
1252  fntime = next_rotation_time;
1253  else
1254  fntime = time(NULL);
1255  filename = logfile_getname(fntime, NULL);
1257  csvfilename = logfile_getname(fntime, ".csv");
1258 
1259  /*
1260  * Decide whether to overwrite or append. We can overwrite if (a)
1261  * Log_truncate_on_rotation is set, (b) the rotation was triggered by
1262  * elapsed time and not something else, and (c) the computed file name is
1263  * different from what we were previously logging into.
1264  *
1265  * Note: last_file_name should never be NULL here, but if it is, append.
1266  */
1267  if (time_based_rotation || (size_rotation_for & LOG_DESTINATION_STDERR))
1268  {
1269  if (Log_truncate_on_rotation && time_based_rotation &&
1270  last_file_name != NULL &&
1271  strcmp(filename, last_file_name) != 0)
1272  fh = logfile_open(filename, "w", true);
1273  else
1274  fh = logfile_open(filename, "a", true);
1275 
1276  if (!fh)
1277  {
1278  /*
1279  * ENFILE/EMFILE are not too surprising on a busy system; just
1280  * keep using the old file till we manage to get a new one.
1281  * Otherwise, assume something's wrong with Log_directory and stop
1282  * trying to create files.
1283  */
1284  if (errno != ENFILE && errno != EMFILE)
1285  {
1286  ereport(LOG,
1287  (errmsg("disabling automatic rotation (use SIGHUP to re-enable)")));
1288  rotation_disabled = true;
1289  }
1290 
1291  if (filename)
1292  pfree(filename);
1293  if (csvfilename)
1294  pfree(csvfilename);
1295  return;
1296  }
1297 
1298  fclose(syslogFile);
1299  syslogFile = fh;
1300 
1301  /* instead of pfree'ing filename, remember it for next time */
1302  if (last_file_name != NULL)
1305  filename = NULL;
1306  }
1307 
1308  /*
1309  * Same as above, but for csv file. Note that if LOG_DESTINATION_CSVLOG
1310  * was just turned on, we might have to open csvlogFile here though it was
1311  * not open before. In such a case we'll append not overwrite (since
1312  * last_csv_file_name will be NULL); that is consistent with the normal
1313  * rules since it's not a time-based rotation.
1314  */
1315  if ((Log_destination & LOG_DESTINATION_CSVLOG) &&
1316  (csvlogFile == NULL ||
1317  time_based_rotation || (size_rotation_for & LOG_DESTINATION_CSVLOG)))
1318  {
1319  if (Log_truncate_on_rotation && time_based_rotation &&
1320  last_csv_file_name != NULL &&
1321  strcmp(csvfilename, last_csv_file_name) != 0)
1322  fh = logfile_open(csvfilename, "w", true);
1323  else
1324  fh = logfile_open(csvfilename, "a", true);
1325 
1326  if (!fh)
1327  {
1328  /*
1329  * ENFILE/EMFILE are not too surprising on a busy system; just
1330  * keep using the old file till we manage to get a new one.
1331  * Otherwise, assume something's wrong with Log_directory and stop
1332  * trying to 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  if (csvfilename)
1344  pfree(csvfilename);
1345  return;
1346  }
1347 
1348  if (csvlogFile != NULL)
1349  fclose(csvlogFile);
1350  csvlogFile = fh;
1351 
1352  /* instead of pfree'ing filename, remember it for next time */
1353  if (last_csv_file_name != NULL)
1355  last_csv_file_name = csvfilename;
1356  csvfilename = NULL;
1357  }
1358  else if (!(Log_destination & LOG_DESTINATION_CSVLOG) &&
1359  csvlogFile != NULL)
1360  {
1361  /* CSVLOG was just turned off, so close the old file */
1362  fclose(csvlogFile);
1363  csvlogFile = NULL;
1364  if (last_csv_file_name != NULL)
1366  last_csv_file_name = NULL;
1367  }
1368 
1369  if (filename)
1370  pfree(filename);
1371  if (csvfilename)
1372  pfree(csvfilename);
1373 
1375 
1377 }
1378 
1379 
1380 /*
1381  * construct logfile name using timestamp information
1382  *
1383  * If suffix isn't NULL, append it to the name, replacing any ".log"
1384  * that may be in the pattern.
1385  *
1386  * Result is palloc'd.
1387  */
1388 static char *
1390 {
1391  char *filename;
1392  int len;
1393 
1394  filename = palloc(MAXPGPATH);
1395 
1396  snprintf(filename, MAXPGPATH, "%s/", Log_directory);
1397 
1398  len = strlen(filename);
1399 
1400  /* treat Log_filename as a strftime pattern */
1401  pg_strftime(filename + len, MAXPGPATH - len, Log_filename,
1402  pg_localtime(&timestamp, log_timezone));
1403 
1404  if (suffix != NULL)
1405  {
1406  len = strlen(filename);
1407  if (len > 4 && (strcmp(filename + (len - 4), ".log") == 0))
1408  len -= 4;
1409  strlcpy(filename + len, suffix, MAXPGPATH - len);
1410  }
1411 
1412  return filename;
1413 }
1414 
1415 /*
1416  * Determine the next planned rotation time, and store in next_rotation_time.
1417  */
1418 static void
1420 {
1421  pg_time_t now;
1422  struct pg_tm *tm;
1423  int rotinterval;
1424 
1425  /* nothing to do if time-based rotation is disabled */
1426  if (Log_RotationAge <= 0)
1427  return;
1428 
1429  /*
1430  * The requirements here are to choose the next time > now that is a
1431  * "multiple" of the log rotation interval. "Multiple" can be interpreted
1432  * fairly loosely. In this version we align to log_timezone rather than
1433  * GMT.
1434  */
1435  rotinterval = Log_RotationAge * SECS_PER_MINUTE; /* convert to seconds */
1436  now = (pg_time_t) time(NULL);
1437  tm = pg_localtime(&now, log_timezone);
1438  now += tm->tm_gmtoff;
1439  now -= now % rotinterval;
1440  now += rotinterval;
1441  now -= tm->tm_gmtoff;
1443 }
1444 
1445 /*
1446  * Store the name of the file(s) where the log collector, when enabled, writes
1447  * log messages. Useful for finding the name(s) of the current log file(s)
1448  * when there is time-based logfile rotation. Filenames are stored in a
1449  * temporary file and which is renamed into the final destination for
1450  * atomicity. The file is opened with the same permissions as what gets
1451  * created in the data directory and has proper buffering options.
1452  */
1453 static void
1455 {
1456  FILE *fh;
1457  mode_t oumask;
1458 
1461  {
1462  if (unlink(LOG_METAINFO_DATAFILE) < 0 && errno != ENOENT)
1463  ereport(LOG,
1465  errmsg("could not remove file \"%s\": %m",
1467  return;
1468  }
1469 
1470  /* use the same permissions as the data directory for the new file */
1471  oumask = umask(pg_mode_mask);
1472  fh = fopen(LOG_METAINFO_DATAFILE_TMP, "w");
1473  umask(oumask);
1474 
1475  if (fh)
1476  {
1477  setvbuf(fh, NULL, PG_IOLBF, 0);
1478 
1479 #ifdef WIN32
1480  /* use CRLF line endings on Windows */
1481  _setmode(_fileno(fh), _O_TEXT);
1482 #endif
1483  }
1484  else
1485  {
1486  ereport(LOG,
1488  errmsg("could not open file \"%s\": %m",
1490  return;
1491  }
1492 
1493  if (last_file_name && (Log_destination & LOG_DESTINATION_STDERR))
1494  {
1495  if (fprintf(fh, "stderr %s\n", last_file_name) < 0)
1496  {
1497  ereport(LOG,
1499  errmsg("could not write file \"%s\": %m",
1501  fclose(fh);
1502  return;
1503  }
1504  }
1505 
1506  if (last_csv_file_name && (Log_destination & LOG_DESTINATION_CSVLOG))
1507  {
1508  if (fprintf(fh, "csvlog %s\n", last_csv_file_name) < 0)
1509  {
1510  ereport(LOG,
1512  errmsg("could not write file \"%s\": %m",
1514  fclose(fh);
1515  return;
1516  }
1517  }
1518  fclose(fh);
1519 
1521  ereport(LOG,
1523  errmsg("could not rename file \"%s\" to \"%s\": %m",
1525 }
1526 
1527 /* --------------------------------
1528  * signal handler routines
1529  * --------------------------------
1530  */
1531 
1532 /*
1533  * Check to see if a log rotation request has arrived. Should be
1534  * called by postmaster after receiving SIGUSR1.
1535  */
1536 bool
1538 {
1539  struct stat stat_buf;
1540 
1541  if (stat(LOGROTATE_SIGNAL_FILE, &stat_buf) == 0)
1542  return true;
1543 
1544  return false;
1545 }
1546 
1547 /*
1548  * Remove the file signaling a log rotation request.
1549  */
1550 void
1552 {
1553  unlink(LOGROTATE_SIGNAL_FILE);
1554 }
1555 
1556 /* SIGHUP: set flag to reload config file */
1557 static void
1559 {
1560  int save_errno = errno;
1561 
1562  got_SIGHUP = true;
1563  SetLatch(MyLatch);
1564 
1565  errno = save_errno;
1566 }
1567 
1568 /* SIGUSR1: set flag to rotate logfile */
1569 static void
1571 {
1572  int save_errno = errno;
1573 
1574  rotation_requested = true;
1575  SetLatch(MyLatch);
1576 
1577  errno = save_errno;
1578 }
NON_EXEC_STATIC void SysLoggerMain(int argc, char *argv[]) pg_attribute_noreturn()
Definition: syslogger.c:157
#define PIPE_HEADER_SIZE
Definition: syslogger.h:60
size_t pg_strftime(char *s, size_t max, const char *format, const struct pg_tm *tm)
Definition: strftime.c:128
static void logfile_rotate(bool time_based_rotation, int size_rotation_for)
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Definition: pg_checksums.c:61
#define pg_attribute_noreturn()
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static pg_time_t next_rotation_time
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#define SIGQUIT
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void write_syslogger_file(const char *buffer, int count, int destination)
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Definition: syslogger.h:46
#define DEBUG1
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int errhint(const char *fmt,...)
Definition: elog.c:1071
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int AddWaitEventToSet(WaitEventSet *set, uint32 events, pgsocket fd, Latch *latch, void *user_data)
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Definition: miscinit.c:93
#define SIGUSR1
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BackendType MyBackendType
Definition: miscinit.c:62
int64 timestamp
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Definition: fork_process.c:32
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#define PIPE_MAX_PAYLOAD
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Definition: syslogger.c:540
#define lengthof(array)
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#define SIGPIPE
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Definition: pgtime.h:36
Definition: pgtime.h:25
#define SIGUSR2
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Definition: latch.c:505
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Definition: postmaster.c:2581
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#define PG_SETMASK(mask)
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#define MAXPGPATH
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Definition: syslogger.c:877
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static bool rotation_disabled
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#define SECS_PER_MINUTE
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Definition: stringinfo.c:59
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