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apache / hawq / c4da083e0d1c3a4630531307db264d24994d3d65 / . / src / backend / postmaster / syslogger.c
blob: 98650d358bb0ed8f49468cb7d544359d9f3bb7c3 [file] [log] [blame]
/*-------------------------------------------------------------------------
*
* syslogger.c
*
* The system logger (syslogger) is new in Postgres 8.0. It catches all
* stderr output from the postmaster, backends, and other subprocesses
* by redirecting to a pipe, and writes it to a set of logfiles.
* It's possible to have size and age limits for the logfile configured
* in postgresql.conf. If these limits are reached or passed, the
* current logfile is closed and a new one is created (rotated).
* The logfiles are stored in a subdirectory (configurable in
* postgresql.conf), using an internal naming scheme that mangles
* creation time and current postmaster pid.
*
* Author: Andreas Pflug <pgadmin@pse-consulting.de>
*
* Copyright (c) 2004-2009, PostgreSQL Global Development Group
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/postmaster/syslogger.c,v 1.29.2.3 2007/08/02 23:17:20 adunstan Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <fcntl.h>
#include <signal.h>
#include <time.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/time.h>
#include "lib/stringinfo.h"
#include "libpq/pqsignal.h"
#include "miscadmin.h"
#include "pgtime.h"
#include "postmaster/fork_process.h"
#include "postmaster/postmaster.h"
#include "postmaster/syslogger.h"
#if (USE_EMAIL || USE_SNMP)
#include "postmaster/sendalert.h"
#endif
#include "storage/ipc.h"
#include "storage/pg_shmem.h"
#include "utils/guc.h"
#include "utils/ps_status.h"
#include "utils/timestamp.h"
#include "cdb/cdbvars.h"
#define READ_BUF_SIZE (2 * PIPE_CHUNK_SIZE)
/* The maximum bytes for error message */
#define ERROR_MESSAGE_MAX_SIZE 200
/*
* GUC parameters. Redirect_stderr cannot be changed after postmaster
* start, but the rest can change at SIGHUP.
*/
bool Redirect_stderr = 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 gp_log_format = 0; /* Text format */
/*
* Globally visible state (used by elog.c)
*/
bool am_syslogger = false;
extern bool redirection_done;
/*
* Private state
*/
static pg_time_t next_rotation_time;
static bool pipe_eof_seen = false;
static FILE *syslogFile = NULL;
static char *last_file_name = NULL;
/* An err msg may break into sever pipe chunks, so we need a buffer to assemble them.
* We fix the number of buffers. Generally a relative small number should suffice.
* If we run out, we will flush partial message. The assemble code will make sure we
* may log partial msg, but we never garble msg. We also make sure the output is valid
* csv (except last line, if syslogger is killed before finish writing a line).
*
* We loop over the saved chunk, because number of buffers are small.
*/
/*
* Buffers for saving partial messages from different backends. We don't expect
* that there will be very many outstanding at one time, so 20 seems plenty of
* leeway. If this array gets full we won't lose messages, but we will lose
* the protocol protection against them being partially written or interleaved.
*
* An inactive buffer has pid == 0 and undefined contents of data.
*/
PipeProtoChunk saved_chunks[CHUNK_SLOTS];
/* Find an unused chunk */
static PipeProtoChunk *find_unused_chunk()
{
int i;
for(i=0; i<CHUNK_SLOTS; ++i)
{
if(saved_chunks[i].hdr.pid == 0)
return &saved_chunks[i];
}
/* oops, all used. */
return NULL;
}
/* These must be exported for EXEC_BACKEND case ... annoying */
#ifndef WIN32
int syslogPipe[2] = {-1, -1};
#else
HANDLE syslogPipe[2] = {0, 0};
#endif
#ifdef WIN32
static HANDLE threadHandle = 0;
static CRITICAL_SECTION sysfileSection;
#endif
static bool chunk_is_postgres_chunk(PipeProtoHeader *hdr)
{
return hdr->zero == 0 && hdr->pid != 0 && hdr->thid != 0 &&
(hdr->log_format == 't' || hdr->log_format == 'c') &&
(hdr->is_last == 't' || hdr->is_last == 'f');
}
static void syslogger_handle_chunk(PipeProtoChunk *savedchunk);
static void syslogger_flush_chunks(void);
/*
* Flags set by interrupt handlers for later service in the main loop.
*/
static volatile sig_atomic_t got_SIGHUP = false;
static volatile sig_atomic_t rotation_requested = false;
/* Local subroutines */
#ifdef EXEC_BACKEND
static pid_t syslogger_forkexec(void);
static void syslogger_parseArgs(int argc, char *argv[]);
#endif
#ifdef WIN32
static void process_pipe_input(char *logbuffer, int *bytes_in_logbuffer);
static void flush_pipe_input(char *logbuffer, int *bytes_in_logbuffer);
static void open_csvlogfile(void);
static unsigned int __stdcall pipeThread(void *arg);
#endif
static void logfile_rotate(bool time_based_rotation);
static char *logfile_getname(pg_time_t timestamp);
static void set_next_rotation_time(void);
static void sigHupHandler(SIGNAL_ARGS);
static void sigUsr1Handler(SIGNAL_ARGS);
/*
* Main entry point for syslogger process
* argc/argv parameters are valid only in EXEC_BACKEND case.
*/
NON_EXEC_STATIC void
SysLoggerMain(int argc, char *argv[])
{
char *currentLogDir;
char *currentLogFilename;
int currentLogRotationAge;
IsUnderPostmaster = true; /* we are a postmaster subprocess now */
MyProcPid = getpid(); /* reset MyProcPid */
MyStartTime = time(NULL); /* set our start time in case we call elog */
#ifdef EXEC_BACKEND
syslogger_parseArgs(argc, argv);
#endif /* EXEC_BACKEND */
am_syslogger = true;
if (AmIMaster() && Gp_role == GP_ROLE_DISPATCH)
init_ps_display("master logger process", "", "", "");
else
init_ps_display("logger process", "", "", "");
/*
* If we restarted, our stderr is already redirected into our own input
* pipe. This is of course pretty useless, not to mention that it
* interferes with detecting pipe EOF. Point stderr to /dev/null. This
* assumes that all interesting messages generated in the syslogger will
* come through elog.c and will be sent to write_syslogger_file.
*/
{
int fd = open(DEVNULL, O_WRONLY, 0);
/*
* The closes might look redundant, but they are not: we want to be
* darn sure the pipe gets closed even if the open failed. We can
* survive running with stderr pointing nowhere, but we can't afford
* to have extra pipe input descriptors hanging around.
*/
close(fileno(stdout));
close(fileno(stderr));
dup2(fd, fileno(stdout));
dup2(fd, fileno(stderr));
close(fd);
}
/*
* Syslogger's own stderr can't be the syslogPipe, so set it back to text
* mode if we didn't just close it. (It was set to binary in
* SubPostmasterMain).
*/
#ifdef WIN32
_setmode(_fileno(stderr),_O_TEXT);
#endif
redirection_done = true;
/*
* Also close our copy of the write end of the pipe. This is needed to
* ensure we can detect pipe EOF correctly. (But note that in the restart
* case, the postmaster already did this.)
*/
#ifndef WIN32
if (syslogPipe[1] >= 0)
close(syslogPipe[1]);
syslogPipe[1] = -1;
#else
if (syslogPipe[1])
CloseHandle(syslogPipe[1]);
syslogPipe[1] = 0;
#endif
/*
* If possible, make this process a group leader, so that the postmaster
* can signal any child processes too. (syslogger probably never has any
* child processes, but for consistency we make all postmaster child
* processes do this.)
*/
#ifdef HAVE_SETSID
if (setsid() < 0)
elog(FATAL, "setsid() failed: %m");
#endif
/*
* Properly accept or ignore signals the postmaster might send us
*
* Note: we ignore all termination signals, and instead exit only when all
* upstream processes are gone, to ensure we don't miss any dying gasps of
* broken backends...
*/
pqsignal(SIGHUP, sigHupHandler); /* set flag to read config file */
pqsignal(SIGINT, SIG_IGN);
pqsignal(SIGTERM, SIG_IGN);
pqsignal(SIGQUIT, SIG_IGN);
pqsignal(SIGALRM, SIG_IGN);
pqsignal(SIGPIPE, SIG_IGN);
pqsignal(SIGUSR1, sigUsr1Handler); /* request log rotation */
pqsignal(SIGUSR2, SIG_IGN);
/*
* Reset some signals that are accepted by postmaster but not here
*/
pqsignal(SIGCHLD, SIG_DFL);
pqsignal(SIGTTIN, SIG_DFL);
pqsignal(SIGTTOU, SIG_DFL);
pqsignal(SIGCONT, SIG_DFL);
pqsignal(SIGWINCH, SIG_DFL);
PG_SETMASK(&UnBlockSig);
#ifdef WIN32
/* Fire up separate data transfer thread */
InitializeCriticalSection(&sysfileSection);
threadHandle = (HANDLE) _beginthreadex(NULL, 0, pipeThread, NULL, 0, NULL);
if (threadHandle == 0)
elog(FATAL, "could not create syslogger data transfer thread: %m");
#endif /* WIN32 */
/* remember active logfile parameters */
currentLogDir = pstrdup(Log_directory);
currentLogFilename = pstrdup(Log_filename);
currentLogRotationAge = Log_RotationAge;
/* set next planned rotation time */
set_next_rotation_time();
/* main worker loop */
for (;;)
{
bool time_based_rotation = false;
#ifndef WIN32
int bytesRead = 0;
int rc;
fd_set rfds;
struct timeval timeout;
#endif
if (got_SIGHUP)
{
got_SIGHUP = false;
ProcessConfigFile(PGC_SIGHUP);
/*
* Check if the log directory or filename pattern changed in
* postgresql.conf. If so, force rotation to make sure we're
* writing the logfiles in the right place.
*/
if (strcmp(Log_directory, currentLogDir) != 0)
{
pfree(currentLogDir);
currentLogDir = pstrdup(Log_directory);
rotation_requested = true;
}
if (strcmp(Log_filename, currentLogFilename) != 0)
{
pfree(currentLogFilename);
currentLogFilename = pstrdup(Log_filename);
rotation_requested = true;
}
/*
* If rotation time parameter changed, reset next rotation time,
* but don't immediately force a rotation.
*/
if (currentLogRotationAge != Log_RotationAge)
{
currentLogRotationAge = Log_RotationAge;
set_next_rotation_time();
}
}
if (!rotation_requested && Log_RotationAge > 0)
{
/* Do a logfile rotation if it's time */
pg_time_t now = (pg_time_t) time(NULL);
if (now >= next_rotation_time)
rotation_requested = time_based_rotation = true;
}
if (!rotation_requested && Log_RotationSize > 0)
{
/* Do a rotation if file is too big */
if (ftell(syslogFile) >= Log_RotationSize * 1024L)
rotation_requested = true;
}
if (rotation_requested)
logfile_rotate(time_based_rotation);
#ifndef WIN32
/*
* Wait for some data, timing out after 1 second
*/
FD_ZERO(&rfds);
FD_SET(syslogPipe[0], &rfds);
timeout.tv_sec = 1;
timeout.tv_usec = 0;
rc = select(syslogPipe[0] + 1, &rfds, NULL, NULL, &timeout);
if (rc < 0)
{
if (errno != EINTR)
ereport(LOG,
(errcode_for_socket_access(),
errmsg("select() failed in logger process: %m")));
}
else if (rc > 0 && FD_ISSET(syslogPipe[0], &rfds))
{
PipeProtoChunk *chunk = find_unused_chunk();
int readPos = 0;
if(chunk == NULL)
syslogger_flush_chunks();
chunk = find_unused_chunk();
Assert(chunk != NULL);
/* Read data to fill the buffer up to PIPE_CHUNK_SIZE bytes */
next_chunkloop:
if (bytesRead < sizeof(PipeProtoHeader))
{
/*
* We always try to make sure that the buffer has at least sizeof(PipeProtoHeader)
* bytes if we have read several bytes in the previous read. This handles the case
* when a valid chunk has to be read in two read calls, and the first read only
* picks up less than sizeof(PipeProtoHeader) bytes.
*
* However, this read may force some 3rd party error messages (less than
* sizeof(PipeProtoHeader) bytes) to sits in the buffer until the next message
* comes in. Thus you may experience some delays for small 3rd party error messages
* showing up in the logfile. Hopefully, this is very rare.
*/
readPos = bytesRead;
bytesRead = piperead(syslogPipe[0], (char *)chunk + readPos, PIPE_CHUNK_SIZE - readPos);
}
if (bytesRead == 0)
{
/*
* Zero bytes read when select() is saying read-ready means
* EOF on the pipe: that is, there are no longer any processes
* with the pipe write end open. Therefore, the postmaster
* and all backends are shut down, and we are done.
*/
pipe_eof_seen = true;
/* if there's any data left then force it out now */
syslogger_flush_chunks();
}
else if (bytesRead < 0)
{
if (errno != EINTR)
elog(ERROR, "Syslogger could not read from logger pipe: %m");
}
else
{
if (bytesRead + readPos >= sizeof(PipeProtoHeader) &&
chunk_is_postgres_chunk((PipeProtoHeader *)chunk))
{
int chunk_size = chunk->hdr.len + sizeof(PipeProtoHeader);
int needBytes = chunk_size - (bytesRead + readPos);
/*
* Finish reading a chunk if the bytes we have read so far
* is not sufficient.
*/
if (needBytes > 0)
{
bytesRead = piperead(syslogPipe[0],
((char *)chunk) + (bytesRead + readPos),
needBytes);
Assert(bytesRead == needBytes);
}
syslogger_handle_chunk(chunk);
/*
* Copy the remaining bytes to the beginning of a new unused chunk
* buffer if we have read too much.
*/
if (needBytes < 0)
{
int moreBytes = bytesRead + readPos - chunk_size;
PipeProtoChunk *new_chunk = find_unused_chunk();
Assert(moreBytes > 0);
if (new_chunk == NULL)
{
syslogger_flush_chunks();
new_chunk = find_unused_chunk();
Assert(new_chunk != NULL);
}
memmove((char *)new_chunk, ((char *)chunk) + chunk_size, moreBytes);
chunk = new_chunk;
bytesRead = moreBytes;
readPos = 0;
goto next_chunkloop;
}
/* go back to the main loop */
}
else
{
/*
* This is a 3rd party error. We may read parts of the standard
* error message along with the 3rd party error. So here, we
* scan the data byte by byte until we find a byte that is 0.
*/
char *msgEnd = (char *)chunk;
char *chunkEnd = ((char *)chunk) + (bytesRead + readPos);
while (*msgEnd != 0 &&
(msgEnd < chunkEnd))
msgEnd++;
if (msgEnd >= chunkEnd)
{
char lastChar = '\0';
/*
* We didn't find a byte '0', so the whole message
* is one 3rd party error message.
*/
if (bytesRead + readPos >= PIPE_CHUNK_SIZE)
{
msgEnd --;
lastChar = *msgEnd;
}
/* Add a '\0' terminator */
*msgEnd = '\0';
elog(LOG, "3rd party error log:\n%s%c", (char *)chunk, lastChar);
/* remember to free this chunk */
chunk->hdr.pid = 0;
}
else
{
Assert(*msgEnd == 0);
/*
* If a 3rd party error does not start with byte '0',
* write the message.
*/
if (msgEnd != (char *)chunk)
elog(LOG, "3rd party error log:\n%s", (char *)chunk);
else
{
/* A 3rd party error starts with bytes '0', ignore this bytes. */
msgEnd++;
}
if (chunkEnd - msgEnd > 0)
{
/* We copy the rest of bytes to the beginning of the chunk buffer. */
memmove((char *)chunk, msgEnd, chunkEnd - msgEnd);
bytesRead = chunkEnd - msgEnd;
readPos = 0;
goto next_chunkloop;
}
}
}
}
}
#else /* WIN32 */
/*
* On Windows we leave it to a separate thread to transfer data and
* detect pipe EOF. The main thread just wakes up once a second to
* check for SIGHUP and rotation conditions.
*/
pg_usleep(1000000L);
#endif /* WIN32 */
if (pipe_eof_seen)
{
/*
* seeing this message on the real stderr is annoying - so we make
* it DEBUG1 to suppress in normal use.
*/
ereport(DEBUG1,
(errmsg("logger shutting down")));
/*
* Normal exit from the syslogger is here. Note that we
* deliberately do not close syslogFile before exiting; this is to
* allow for the possibility of elog messages being generated
* inside proc_exit. Regular exit() will take care of flushing
* and closing stdio channels.
*/
proc_exit(0);
}
}
}
/*
* Postmaster subroutine to start a syslogger subprocess.
*/
int
SysLogger_Start(void)
{
pid_t sysloggerPid;
char *filename;
if (!Redirect_stderr)
return 0;
/*
* If first time through, create the pipe which will receive stderr
* output.
*
* If the syslogger crashes and needs to be restarted, we continue to use
* the same pipe (indeed must do so, since extant backends will be writing
* into that pipe).
*
* This means the postmaster must continue to hold the read end of the
* pipe open, so we can pass it down to the reincarnated syslogger. This
* is a bit klugy but we have little choice.
*/
#ifndef WIN32
if (syslogPipe[0] < 0)
{
if (pgpipe(syslogPipe) < 0)
ereport(FATAL,
(errcode_for_socket_access(),
(errmsg("could not create pipe for syslog: %m"))));
}
#else
if (!syslogPipe[0])
{
SECURITY_ATTRIBUTES sa;
memset(&sa, 0, sizeof(SECURITY_ATTRIBUTES));
sa.nLength = sizeof(SECURITY_ATTRIBUTES);
sa.bInheritHandle = TRUE;
if (!CreatePipe(&syslogPipe[0], &syslogPipe[1], &sa, 32768))
ereport(FATAL,
(errcode_for_file_access(),
(errmsg("could not create pipe for syslog: %m"))));
}
#endif
/*
* Create log directory if not present; ignore errors
*/
mkdir(Log_directory, 0700);
/*
* The initial logfile is created right in the postmaster, to verify that
* the Log_directory is writable.
*/
filename = logfile_getname(time(NULL));
syslogFile = fopen(filename, "a");
if (!syslogFile)
ereport(FATAL,
(errcode_for_file_access(),
(errmsg("could not create log file \"%s\": %m",
filename))));
setvbuf(syslogFile, NULL, LBF_MODE, 0);
pfree(filename);
#ifdef EXEC_BACKEND
switch ((sysloggerPid = syslogger_forkexec()))
#else
switch ((sysloggerPid = fork_process()))
#endif
{
case -1:
ereport(LOG,
(errmsg("could not fork system logger: %m")));
return 0;
#ifndef EXEC_BACKEND
case 0:
/* in postmaster child ... */
/* Close the postmaster's sockets */
ClosePostmasterPorts(true);
/* Lose the postmaster's on-exit routines */
on_exit_reset();
/* Drop our connection to postmaster's shared memory, as well */
PGSharedMemoryDetach();
/* do the work */
SysLoggerMain(0, NULL);
break;
#endif
default:
/* success, in postmaster */
/* now we redirect stderr, if not done already */
if (!redirection_done)
{
#ifndef WIN32
fflush(stdout);
if (dup2(syslogPipe[1], fileno(stdout)) < 0)
ereport(FATAL,
(errcode_for_file_access(),
errmsg("could not redirect stdout: %m")));
fflush(stderr);
if (dup2(syslogPipe[1], fileno(stderr)) < 0)
ereport(FATAL,
(errcode_for_file_access(),
errmsg("could not redirect stderr: %m")));
/* Now we are done with the write end of the pipe. */
close(syslogPipe[1]);
syslogPipe[1] = -1;
#else
int fd;
/*
* open the pipe in binary mode and make sure stderr is binary
* after it's been dup'ed into, to avoid disturbing the pipe
* chunking protocol.
*/
fflush(stderr);
fd = _open_osfhandle((long) syslogPipe[1],
_O_APPEND | _O_BINARY);
if (dup2(fd, _fileno(stderr)) < 0)
ereport(FATAL,
(errcode_for_file_access(),
errmsg("could not redirect stderr: %m")));
close(fd);
_setmode(_fileno(stderr),_O_BINARY);
/* Now we are done with the write end of the pipe. */
CloseHandle(syslogPipe[1]);
syslogPipe[1] = 0;
#endif
redirection_done = true;
}
/* postmaster will never write the file; close it */
fclose(syslogFile);
syslogFile = NULL;
return (int) sysloggerPid;
}
/* we should never reach here */
return 0;
}
#ifdef EXEC_BACKEND
/*
* syslogger_forkexec() -
*
* Format up the arglist for, then fork and exec, a syslogger process
*/
static pid_t
syslogger_forkexec(void)
{
char *av[10];
int ac = 0;
char filenobuf[32];
av[ac++] = "postgres";
av[ac++] = "--forklog";
av[ac++] = NULL; /* filled in by postmaster_forkexec */
/* static variables (those not passed by write_backend_variables) */
#ifndef WIN32
if (syslogFile != NULL)
snprintf(filenobuf, sizeof(filenobuf), "%d",
fileno(syslogFile));
else
strcpy(filenobuf, "-1");
#else /* WIN32 */
if (syslogFile != NULL)
snprintf(filenobuf, sizeof(filenobuf), "%ld",
_get_osfhandle(_fileno(syslogFile)));
else
strcpy(filenobuf, "0");
#endif /* WIN32 */
av[ac++] = filenobuf;
av[ac] = NULL;
Assert(ac < lengthof(av));
return postmaster_forkexec(ac, av);
}
/*
* syslogger_parseArgs() -
*
* Extract data from the arglist for exec'ed syslogger process
*/
static void
syslogger_parseArgs(int argc, char *argv[])
{
int fd;
Assert(argc == 4);
argv += 3;
#ifndef WIN32
fd = atoi(*argv++);
if (fd != -1)
{
syslogFile = fdopen(fd, "a");
setvbuf(syslogFile, NULL, LBF_MODE, 0);
}
#else /* WIN32 */
fd = atoi(*argv++);
if (fd != 0)
{
fd = _open_osfhandle(fd, _O_APPEND | _O_TEXT);
if (fd > 0)
{
syslogFile = fdopen(fd, "a");
setvbuf(syslogFile, NULL, LBF_MODE, 0);
}
}
#endif /* WIN32 */
}
#endif /* EXEC_BACKEND */
/*
* Write a given timestamp to the log file.
*/
void
syslogger_append_timestamp(pg_time_t stamp_time, bool amsyslogger, bool append_comma)
{
if(stamp_time != 0)
{
char strbuf[128];
pg_strftime(strbuf, sizeof(strbuf),
/* Win32 timezone names are too long so don't print them */
#ifndef WIN32
"%Y-%m-%d %H:%M:%S %Z",
#else
"%Y-%m-%d %H:%M:%S",
#endif
pg_localtime(&stamp_time, log_timezone ? log_timezone : gmt_timezone));
if (amsyslogger)
write_syslogger_file_binary(strbuf, strlen(strbuf));
else
write(fileno(stderr), strbuf, strlen(strbuf));
}
if (append_comma)
{
if (amsyslogger)
write_syslogger_file_binary(",", 1);
else
write(fileno(stderr), ",", 1);
}
}
/*
* Write the current timestamp with milliseconds to the syslogger file or
* stderr.
*
* It is not safe to call strftime since it is not async-safe, and it
* is expensive to call strftime to get timezone everytime, we use
* pg_strftime, but stick on a fixed timezone (default_timezone)
* instead a settable timezone as PostgreSQL does, since we want all
* log messages to have the same time format. See MPP-2591.
*/
void
syslogger_append_current_timestamp(bool amsyslogger)
{
struct timeval tv;
pg_time_t stamp_time;
char strbuf[128];
char msbuf[8];
gettimeofday(&tv, NULL);
stamp_time = (pg_time_t) tv.tv_sec;
pg_strftime(strbuf, sizeof(strbuf),
/* leave room for milliseconds... */
/* Win32 timezone names are too long so don't print them */
#ifndef WIN32
"%Y-%m-%d %H:%M:%S %Z",
#else
"%Y-%m-%d %H:%M:%S ",
#endif
pg_localtime(&stamp_time, log_timezone ? log_timezone : gmt_timezone));
/* 'paste' milliseconds into place... */
sprintf(msbuf, ".%06d", (int) (tv.tv_usec));
strncpy(strbuf + 19, msbuf, 7);
if (amsyslogger)
{
write_syslogger_file_binary(strbuf, strlen(strbuf));
write_syslogger_file_binary(",", 1);
}
else
{
write(fileno(stderr), strbuf, strlen(strbuf));
write(fileno(stderr), ",", 1);
}
}
/*
* We use the PostgreSQL defaults for CSV, i.e. quote = escape = '"'
* If it's NULL, append nothing.
*/
int syslogger_write_str(const char *data, int len, bool amsyslogger, bool csv)
{
int cnt = 0;
/* avoid confusing an empty string with NULL */
if (data == NULL)
return 0;
while (cnt < len && data[cnt] != '\0')
{
if (csv && data[cnt] == '"')
{
if (amsyslogger)
write_syslogger_file_binary("\"", 1);
else
write(fileno(stderr), "\"", 1);
}
if (amsyslogger)
write_syslogger_file_binary(data+cnt, 1);
else
write(fileno(stderr), data+cnt, 1);
cnt+=1;
}
return cnt;
}
/*
* Write a string, ended with '\0', in a specific chunk to the log.
*
* If csv is true, this function puts double-quotes around the string.
* If both csv and quote_empty_string are true, this function puts
* double-quotes around an empty string.
* If append_comma is true, this function appends a comma after the string.
*/
static void
syslogger_write_str_from_chunk(CSVChunkStr *chunkstr, bool csv,
bool quote_empty_string, bool append_comma)
{
int wlen = 0;
int len = 0;
bool is_empty_string = false;
if (chunkstr->chunk != NULL)
{
len = chunkstr->chunk->hdr.len - (chunkstr->p - chunkstr->chunk->data);
/* Check if the string is an empty string */
if (len > 0 && chunkstr->p[0] == '\0')
is_empty_string = true;
if (len == 0 && chunkstr->chunk->hdr.next >= 0)
{
PipeProtoChunk *next_chunk = &saved_chunks[chunkstr->chunk->hdr.next];
if (next_chunk->hdr.len > 0 && next_chunk->data[0] == '\0')
is_empty_string = true;
}
}
else
{
Assert(chunkstr->p == NULL);
is_empty_string = true;
}
if(csv && (!is_empty_string || quote_empty_string))
write_syslogger_file_binary("\"", 1);
while(chunkstr->p)
{
bool done = false;
wlen = syslogger_write_str(chunkstr->p, len, true, csv);
/* Write OK, don't forget to account for the trailing 0 */
if(wlen < len)
{
done = true;
chunkstr->p += wlen + 1;
}
else
chunkstr->p += wlen;
if(chunkstr->p - chunkstr->chunk->data == chunkstr->chunk->hdr.len)
{
/* switch to next chunk */
if(chunkstr->chunk->hdr.next >= 0)
{
chunkstr->chunk = &saved_chunks[chunkstr->chunk->hdr.next];
chunkstr->p = chunkstr->chunk->data;
len = chunkstr->chunk->hdr.len - (chunkstr->p - chunkstr->chunk->data);
}
else
{
chunkstr->chunk = NULL;
chunkstr->p = NULL;
}
}
if(done)
break;
}
if(csv && (!is_empty_string || quote_empty_string))
write_syslogger_file_binary("\"", 1);
if (append_comma)
write_syslogger_file_binary(",", 1);
}
void
syslogger_write_int32(bool test0, const char *prefix, int32 i, bool amsyslogger, bool append_comma)
{
char buf[1024];
int len;
if (!test0 || i > 0)
{
len = sprintf(buf, "%s%d", prefix, i);
if (amsyslogger)
write_syslogger_file_binary(buf, len);
else
write(fileno(stderr), buf, len);
}
if (append_comma)
{
if (amsyslogger)
write_syslogger_file_binary(",", 1);
else
write(fileno(stderr), ",", 1);
}
}
/*
* setErrorDataFromSegvChunk
* Fill in the given error data with the chunk that contains the message
* sent in a SEGV/BUS/ILL handler.
*/
static void
fillinErrorDataFromSegvChunk(GpErrorData *errorData, PipeProtoChunk *chunk)
{
Assert(chunk != NULL &&
chunk->hdr.is_segv_msg == 't' &&
chunk->hdr.is_last == 't');
GpSegvErrorData *segvData = (GpSegvErrorData *)chunk->data;
errorData->fix_fields.session_start_time = segvData->session_start_time;
errorData->fix_fields.send_alert = 't';
errorData->fix_fields.omit_location = 'f';
/* This field is always true now. We should remove this eventually. */
errorData->fix_fields.gp_is_primary = 't';
errorData->fix_fields.gp_session_id = segvData->gp_session_id;
errorData->fix_fields.gp_command_count = segvData->gp_command_count;
errorData->fix_fields.gp_segment_id = segvData->gp_segment_id;
errorData->fix_fields.slice_id = segvData->slice_id;
errorData->fix_fields.error_cursor_pos = 0;
errorData->fix_fields.internal_query_pos = 0;
errorData->fix_fields.error_fileline = 0;
errorData->fix_fields.top_trans_id = 0;
errorData->fix_fields.dist_trans_id = 0;
errorData->fix_fields.local_trans_id = 0;
errorData->fix_fields.subtrans_id = 0;
errorData->username = NULL;
errorData->databasename = NULL;
errorData->remote_host = NULL;
errorData->remote_port = NULL;
errorData->error_severity = "PANIC";
errorData->sql_state = "XX000";
errorData->error_message = palloc0(ERROR_MESSAGE_MAX_SIZE);
const char *signalName = SegvBusIllName(segvData->signal_num);
Assert(signalName != NULL);
snprintf(errorData->error_message, ERROR_MESSAGE_MAX_SIZE,
"Unexpected internal error: %s received signal %s",
(AmIMaster() && Gp_role == GP_ROLE_DISPATCH) ? "Master process" : "Segment process",
signalName);
errorData->error_detail = NULL;
errorData->error_hint = NULL;
errorData->internal_query = NULL;
errorData->error_context = NULL;
errorData->debug_query_string = NULL;
errorData->error_func_name = NULL;
errorData->error_filename = NULL;
errorData->stacktrace = NULL;
if (segvData->frame_depth > 0)
{
void *stackAddressArray = (chunk->data + MAXALIGN(sizeof(GpSegvErrorData)));
void **stackAddresses = stackAddressArray;
errorData->stacktrace = gp_stacktrace(stackAddresses, segvData->frame_depth);
}
}
/*
* freeErrorDataFields
* Free the palloc'ed fields inside GpErrorData.
*
* This is the counterpart for fillinErrorDataFromSegvChunk. Currently, only error message and
* stacktrace need to be freed.
*/
static void
freeErrorDataFields(GpErrorData *errorData)
{
pfree(errorData->error_message);
if (errorData->stacktrace != NULL)
{
pfree(errorData->stacktrace);
}
}
/*
* syslogger_write_str_with_comma
* Write the given string to the log. A comma is appended after the given string.
*
* If csv is true, double quotes are added around the string.
*/
static void
syslogger_write_str_with_comma(const char *data, bool amsyslogger, bool csv)
{
if (data != NULL)
{
if (csv)
{
write_syslogger_file_binary("\"", 1);
}
syslogger_write_str(data, strlen(data), amsyslogger, csv);
if (csv)
{
write_syslogger_file_binary("\"", 1);
}
}
write_syslogger_file_binary(",", 1);
}
/*
* syslogger_write_errordata
* Write the GpErrorData to the log.
*/
static void
syslogger_write_errordata(PipeProtoHeader *chunkHeader, GpErrorData *errorData, bool csv)
{
syslogger_append_current_timestamp(true);
/* username */
syslogger_write_str_with_comma(errorData->username, true, csv);
/* databasename */
syslogger_write_str_with_comma(errorData->databasename, true, csv);
/* Process id, thread id */
syslogger_write_int32(false, "p", chunkHeader->pid, true, true);
syslogger_write_int32(false, "th", chunkHeader->thid, true, true);
/* Remote host */
syslogger_write_str_with_comma(errorData->remote_host, true, csv);
/* Remote port */
syslogger_write_str_with_comma(errorData->remote_port, true, csv);
/* session start timestamp */
syslogger_append_timestamp(errorData->fix_fields.session_start_time, true, true);
/* Transaction id */
syslogger_write_int32(false, "", errorData->fix_fields.top_trans_id, true, true);
/* GPDB specific options. */
syslogger_write_int32(true, "con", errorData->fix_fields.gp_session_id, true, true);
syslogger_write_int32(true, "cmd", errorData->fix_fields.gp_command_count, true, true);
syslogger_write_int32(false, errorData->fix_fields.gp_is_primary == 't'? "seg" : "mir", errorData->fix_fields.gp_segment_id,
true, true);
syslogger_write_int32(true, "slice", errorData->fix_fields.slice_id, true, true);
syslogger_write_int32(true, "dx", errorData->fix_fields.dist_trans_id, true, true);
syslogger_write_int32(true, "x", errorData->fix_fields.local_trans_id, true, true);
syslogger_write_int32(true, "sx", errorData->fix_fields.subtrans_id, true, true);
/* error severity */
syslogger_write_str_with_comma(errorData->error_severity, true, csv);
/* sql state code */
syslogger_write_str_with_comma(errorData->sql_state, true, csv);
/* errmsg */
syslogger_write_str_with_comma(errorData->error_message, true, csv);
/* errdetail */
syslogger_write_str_with_comma(errorData->error_detail, true, csv);
/* errhint */
syslogger_write_str_with_comma(errorData->error_hint, true, csv);
/* internal query */
syslogger_write_str_with_comma(errorData->internal_query, true, csv);
/* internal query pos */
syslogger_write_int32(true, "", errorData->fix_fields.internal_query_pos, true, true);
/* err ctxt */
syslogger_write_str_with_comma(errorData->error_context, true, csv);
/* user query */
syslogger_write_str_with_comma(errorData->debug_query_string, true, csv);
/* cursor pos */
syslogger_write_int32(false, "", errorData->fix_fields.error_cursor_pos, true, true);
/* func name */
syslogger_write_str_with_comma(errorData->error_func_name, true, csv);
/* file name */
syslogger_write_str_with_comma(errorData->error_filename, true, csv);
/* line number */
syslogger_write_int32(true, "", errorData->fix_fields.error_fileline, true, true);
/* stack trace */
if (errorData->stacktrace != NULL)
{
if (csv)
{
write_syslogger_file_binary("\"", 1);
}
syslogger_write_str(errorData->stacktrace, strlen(errorData->stacktrace), true, csv);
if (csv)
{
write_syslogger_file_binary("\"", 1);
}
}
/* EOL */
write_syslogger_file_binary(LOG_EOL, strlen(LOG_EOL));
#if USE_EMAIL
/*
* Send alerts when needed. The alerts are sent only by the master.
* If the alert is failed for whatever reason, log a message and continue.
*/
if (errorData->fix_fields.send_alert == 't' &&
AmIMaster() && Gp_role == GP_ROLE_DISPATCH)
{
PG_TRY();
{
send_alert(errorData);
}
PG_CATCH();
{
elog(LOG,"Failed to send alert.");
}
PG_END_TRY();
}
#endif
}
/*
* syslogger_log_segv_chunk
* Write the chunk for the message sent inside a SEGV/BUS/ILL handler to the log.
*/
static void
syslogger_log_segv_chunk(PipeProtoChunk *chunk)
{
Assert(chunk->hdr.is_segv_msg == 't' && chunk->hdr.is_last == 't');
Assert(chunk->hdr.thid == FIXED_THREAD_ID);
/* Reset the thread id */
chunk->hdr.thid = 0;
GpErrorData errorData;
fillinErrorDataFromSegvChunk(&errorData, chunk);
syslogger_write_errordata(&chunk->hdr, &errorData, chunk->hdr.log_format == 'c');
freeErrorDataFields(&errorData);
/* mark chunk as unused */
chunk->hdr.pid = 0;
}
void syslogger_log_chunk_list(PipeProtoChunk *chunk)
{
GpErrorDataFixFields *pfixed = (GpErrorDataFixFields *) (chunk->data);
if(chunk->hdr.log_format == 't')
{
CSVChunkStr chunkstr = { chunk, chunk->data };
syslogger_write_str_from_chunk(&chunkstr, false, false, false);
}
else
{
CSVChunkStr chunkstr = { chunk, chunk->data + sizeof(GpErrorDataFixFields) };
/*
* timestamp_with_milliseconds
*/
syslogger_append_current_timestamp(true);
/* username */
syslogger_write_str_from_chunk(&chunkstr, true, false, true);
/* databasename */
syslogger_write_str_from_chunk(&chunkstr, true, false, true);
/* Process id, thread id */
syslogger_write_int32(false, "p", chunk->hdr.pid, true, true);
syslogger_write_int32(false, "th", chunk->hdr.thid, true, true);
/* Remote host */
syslogger_write_str_from_chunk(&chunkstr, true, false, true);
/* Remote port */
syslogger_write_str_from_chunk(&chunkstr, true, false, true);
/* session start timestamp */
syslogger_append_timestamp(pfixed->session_start_time, true, true);
/* Transaction id */
syslogger_write_int32(false, "", pfixed->top_trans_id, true, true);
/* GPDB specific options. */
syslogger_write_int32(true, "con", pfixed->gp_session_id, true, true);
syslogger_write_int32(true, "cmd", pfixed->gp_command_count, true, true);
syslogger_write_int32(false, pfixed->gp_is_primary == 't'? "seg" : "mir", pfixed->gp_segment_id,
true, true);
syslogger_write_int32(true, "slice", pfixed->slice_id, true, true);
syslogger_write_int32(true, "dx", pfixed->dist_trans_id, true, true);
syslogger_write_int32(true, "x", pfixed->local_trans_id, true, true);
syslogger_write_int32(true, "sx", pfixed->subtrans_id, true, true);
/* error severity */
syslogger_write_str_from_chunk(&chunkstr, true, false, true);
/* sql state code */
syslogger_write_str_from_chunk(&chunkstr, true, false, true);
/* errmsg */
syslogger_write_str_from_chunk(&chunkstr, true, false, true);
/* errdetail */
syslogger_write_str_from_chunk(&chunkstr, true, false, true);
/* errhint */
syslogger_write_str_from_chunk(&chunkstr, true, false, true);
/* internal query */
syslogger_write_str_from_chunk(&chunkstr, true, false, true);
/* internal query pos */
syslogger_write_int32(true, "", pfixed->internal_query_pos, true, true);
/* err ctxt */
syslogger_write_str_from_chunk(&chunkstr, true, false, true);
/* user query */
syslogger_write_str_from_chunk(&chunkstr, true, false, true);
/* cursor pos */
syslogger_write_int32(false, "", pfixed->error_cursor_pos, true, true);
/* func name */
syslogger_write_str_from_chunk(&chunkstr, true, false, true);
/* file name */
syslogger_write_str_from_chunk(&chunkstr, true, false, true);
/* line number */
syslogger_write_int32(true, "", pfixed->error_fileline, true, true);
/* stack trace */
syslogger_write_str_from_chunk(&chunkstr, true, false, false);
/* EOL */
write_syslogger_file_binary(LOG_EOL, strlen(LOG_EOL));
#if USE_EMAIL
if (pfixed->send_alert == 't')
if (AmIMaster() && Gp_role == GP_ROLE_DISPATCH) /* Only the master sends alerts */
send_alert_from_chunks(chunk, &saved_chunks[0]);
#endif
}
/* Free the chunks */
while(true)
{
chunk->hdr.pid = 0;
if(chunk->hdr.next == -1)
break;
chunk = &saved_chunks[chunk->hdr.next];
}
}
static void syslogger_flush_chunks()
{
PipeProtoChunk * chunk = NULL;
int i;
for(i=0; i<CHUNK_SLOTS; ++i)
{
if(saved_chunks[i].hdr.pid != 0
&& saved_chunks[i].hdr.chunk_no == 0)
{
chunk = &saved_chunks[i];
syslogger_log_chunk_list(chunk);
}
}
/* make sure we free everything */
for (i=0; i<CHUNK_SLOTS; ++i)
{
saved_chunks[i].hdr.pid = 0;
}
}
static void syslogger_handle_chunk(PipeProtoChunk *chunk)
{
int i;
PipeProtoChunk *first = NULL;
PipeProtoChunk *prev = NULL;
#ifdef USE_TEST_UTILS
if (chunk->hdr.log_format == 'X')
{
if (chunk->hdr.log_line_number == 1)
{
proc_exit(1);
}
else if (chunk->hdr.log_line_number == 2)
{
proc_exit(2);
}
else if (chunk->hdr.log_line_number == 11)
{
*(int *) 0 = 1234;
}
else
{
abort();
}
return;
}
#endif
Assert(chunk->hdr.log_format == 'c' || chunk->hdr.log_format == 't');
/* I am the last, so chain no one */
chunk->hdr.next = -1;
/* find interesting things */
for(i = 0; i<CHUNK_SLOTS; ++i)
{
if(saved_chunks[i].hdr.pid == chunk->hdr.pid &&
saved_chunks[i].hdr.thid == chunk->hdr.thid &&
saved_chunks[i].hdr.log_line_number == chunk->hdr.log_line_number)
{
if(saved_chunks[i].hdr.chunk_no == 0)
first = &saved_chunks[i];
if(saved_chunks[i].hdr.chunk_no == chunk->hdr.chunk_no - 1)
prev = &saved_chunks[i];
}
}
/* Chain me */
if(prev)
prev->hdr.next = chunk - &saved_chunks[0];
else if(chunk->hdr.chunk_no != 0)
{
/* A chunk without prev, drop it on the floor */
elog(LOG, "Out of order or dangling chunks from pid %d", chunk->hdr.pid);
/* remember to free this chunk */
chunk->hdr.pid = 0;
/* Out of order chunk, if we have something before this, output */
if(first)
syslogger_log_chunk_list(first);
return;
}
if(chunk->hdr.is_last == 't')
{
if (chunk->hdr.is_segv_msg == 't')
{
syslogger_log_segv_chunk(first);
}
else
{
syslogger_log_chunk_list(first);
}
}
}
#ifdef WIN32
/* --------------------------------
* pipe protocol handling
* --------------------------------
*/
/*
* Process data received through the syslogger pipe.
*
* This routine interprets the log pipe protocol which sends log messages as
* (hopefully atomic) chunks - such chunks are detected and reassembled here.
*
* The protocol has a header that starts with two nul bytes, then has a 16 bit
* length, the pid of the sending process, and a flag to indicate if it is
* the last chunk in a message. Incomplete chunks are saved until we read some
* more, and non-final chunks are accumulated until we get the final chunk.
*
* All of this is to avoid 2 problems:
* . partial messages being written to logfiles (messes rotation), and
* . messages from different backends being interleaved (messages garbled).
*
* Any non-protocol messages are written out directly. These should only come
* from non-PostgreSQL sources, however (e.g. third party libraries writing to
* stderr).
*
* logbuffer is the data input buffer, and *bytes_in_logbuffer is the number
* of bytes present. On exit, any not-yet-eaten data is left-justified in
* logbuffer, and *bytes_in_logbuffer is updated.
*/
static void
process_pipe_input(char *logbuffer, int *bytes_in_logbuffer)
{
char *cursor = logbuffer;
int count = *bytes_in_logbuffer;
int dest = LOG_DESTINATION_STDERR;
/* While we have enough for a header, process data... */
while (count >= (int) sizeof(PipeProtoHeader))
{
PipeProtoHeader p;
int chunklen;
/* Do we have a valid header? */
memcpy(&p, cursor, sizeof(PipeProtoHeader));
if (p.zero == 0 &&
p.len > 0 && p.len <= PIPE_MAX_PAYLOAD &&
p.pid != 0 &&
p.thid != 0 &&
(p.is_last == 't' || p.is_last == 'f' ||
p.is_last == 'T' || p.is_last == 'F'))
{
chunklen = PIPE_HEADER_SIZE + p.len;
/* Fall out of loop if we don't have the whole chunk yet */
if (count < chunklen)
break;
dest = (p.log_format == 'c' || p.log_format == 'f') ?
LOG_DESTINATION_CSVLOG : LOG_DESTINATION_STDERR;
/* Finished processing this chunk */
cursor += chunklen;
count -= chunklen;
}
else
{
/* Process non-protocol data */
/*
* Look for the start of a protocol header. If found, dump data
* up to there and repeat the loop. Otherwise, dump it all and
* fall out of the loop. (Note: we want to dump it all if at all
* possible, so as to avoid dividing non-protocol messages across
* logfiles. We expect that in many scenarios, a non-protocol
* message will arrive all in one read(), and we want to respect
* the read() boundary if possible.)
*/
for (chunklen = 1; chunklen < count; chunklen++)
{
if (cursor[chunklen] == '\0')
break;
}
/* fall back on the stderr log as the destination */
write_syslogger_file(cursor, chunklen /*, LOG_DESTINATION_STDERR*/);
cursor += chunklen;
count -= chunklen;
}
}
/* We don't have a full chunk, so left-align what remains in the buffer */
if (count > 0 && cursor != logbuffer)
memmove(logbuffer, cursor, count);
*bytes_in_logbuffer = count;
}
/*
* Force out any buffered data
*
* This is currently used only at syslogger shutdown, but could perhaps be
* useful at other times, so it is careful to leave things in a clean state.
*/
static void
flush_pipe_input(char *logbuffer, int *bytes_in_logbuffer)
{
syslogger_flush_chunks();
}
#endif
/* --------------------------------
* logfile routines
* --------------------------------
*/
/*
* Write binary data to the currently open logfile
*
* On Windows the data arriving in the pipe already has CR/LF newlines,
* so we must send it to the file without further translation.
*/
void write_syslogger_file_binary(const char *buffer, int count)
{
int rc;
#ifndef WIN32
rc = fwrite(buffer, 1, count, syslogFile);
#else
EnterCriticalSection(&sysfileSection);
rc = fwrite(buffer, 1, count, syslogFile);
LeaveCriticalSection(&sysfileSection);
#endif
/* can't use ereport here because of possible recursion */
if (rc != count)
write_stderr("could not write to log file: %s\n", strerror(errno));
}
void write_syslogger_file(const char *buffer, int count)
{
write_syslogger_file_binary(buffer,count);
}
#ifdef WIN32
/*
* Worker thread to transfer data from the pipe to the current logfile.
*
* We need this because on Windows, WaitForSingleObject does not work on
* unnamed pipes: it always reports "signaled", so the blocking ReadFile won't
* allow for SIGHUP; and select is for sockets only.
*/
static unsigned int __stdcall
pipeThread(void *arg)
{
char logbuffer[READ_BUF_SIZE];
int bytes_in_logbuffer = 0;
for (;;)
{
DWORD bytesRead;
if (!ReadFile(syslogPipe[0],
logbuffer + bytes_in_logbuffer,
sizeof(logbuffer) - bytes_in_logbuffer,
&bytesRead, 0))
{
DWORD error = GetLastError();
if (error == ERROR_HANDLE_EOF ||
error == ERROR_BROKEN_PIPE)
break;
_dosmaperr(error);
ereport(LOG,
(errcode_for_file_access(),
errmsg("could not read from logger pipe: %m")));
}
else if (bytesRead > 0)
{
bytes_in_logbuffer += bytesRead;
process_pipe_input(logbuffer, &bytes_in_logbuffer);
}
}
/* We exit the above loop only upon detecting pipe EOF */
pipe_eof_seen = true;
/* if there's any data left then force it out now */
flush_pipe_input(logbuffer, &bytes_in_logbuffer);
_endthread();
return 0;
}
#endif /* WIN32 */
/*
* perform logfile rotation
*/
static void
logfile_rotate(bool time_based_rotation)
{
char *filename;
FILE *fh;
rotation_requested = false;
/*
* When doing a time-based rotation, invent the new logfile name based on
* the planned rotation time, not current time, to avoid "slippage" in the
* file name when we don't do the rotation immediately.
*/
if (time_based_rotation)
filename = logfile_getname(next_rotation_time);
else
filename = logfile_getname(time(NULL));
/*
* Decide whether to overwrite or append. We can overwrite if (a)
* Log_truncate_on_rotation is set, (b) the rotation was triggered by
* elapsed time and not something else, and (c) the computed file name is
* different from what we were previously logging into.
*
* Note: during the first rotation after forking off from the postmaster,
* last_file_name will be NULL. (We don't bother to set it in the
* postmaster because it ain't gonna work in the EXEC_BACKEND case.) So we
* will always append in that situation, even though truncating would
* usually be safe.
*/
if (Log_truncate_on_rotation && time_based_rotation &&
last_file_name != NULL && strcmp(filename, last_file_name) != 0)
fh = fopen(filename, "w");
else
fh = fopen(filename, "a");
if (!fh)
{
int saveerrno = errno;
ereport(LOG,
(errcode_for_file_access(),
errmsg("could not open new log file \"%s\": %m",
filename)));
/*
* ENFILE/EMFILE are not too surprising on a busy system; just
* keep using the old file till we manage to get a new one.
* Otherwise, assume something's wrong with Log_directory and stop
* trying to create files.
*/
if (saveerrno != ENFILE && saveerrno != EMFILE)
{
ereport(LOG,
(errmsg("disabling automatic rotation (use SIGHUP to reenable)")));
Log_RotationAge = 0;
Log_RotationSize = 0;
}
pfree(filename);
return;
}
setvbuf(fh, NULL, LBF_MODE, 0);
#ifdef WIN32
_setmode(_fileno(fh), _O_TEXT); /* use CRLF line endings on Windows */
#endif
/* On Windows, need to interlock against data-transfer thread */
#ifdef WIN32
EnterCriticalSection(&sysfileSection);
#endif
fclose(syslogFile);
syslogFile = fh;
#ifdef WIN32
LeaveCriticalSection(&sysfileSection);
#endif
set_next_rotation_time();
/* instead of pfree'ing filename, remember it for next time */
if (last_file_name != NULL)
pfree(last_file_name);
last_file_name = filename;
}
/*
* construct logfile name using timestamp information
*
* Result is palloc'd.
*/
static char *
logfile_getname(pg_time_t timestamp)
{
char *filename;
int len;
struct pg_tm *tm;
char *suffix;
#define CSV_SUFFIX ".csv"
filename = palloc(MAXPGPATH);
snprintf(filename, MAXPGPATH, "%s/", Log_directory);
len = strlen(filename);
if (strchr(Log_filename, '%'))
{
/* treat it as a strftime pattern */
tm = pg_localtime(&timestamp, log_timezone);
pg_strftime(filename + len, MAXPGPATH - len, Log_filename, tm);
}
else
{
/* no strftime escapes, so append timestamp to new filename */
snprintf(filename + len, MAXPGPATH - len, "%s.%lu",
Log_filename, (unsigned long) timestamp);
}
/*
* If the logging format is 'TEXT' and the filename ends with ".csv",
* replace ".csv" with ".log".
*
* If the logging format is 'CSV' and the filename does not end with ".csv",
* replace the last four characters in the filename with ".cvs".
*/
if (strlen(filename) - sizeof(CSV_SUFFIX) + 1 > 0)
suffix = filename + (strlen(filename) - sizeof(CSV_SUFFIX) + 1);
else
/*
* Point the suffix to the end of string if the length of
* the filename is less than ".csv".
*/
suffix = filename + strlen(filename);
if (gp_log_format == 0 && pg_strcasecmp(suffix, CSV_SUFFIX) == 0)
{
snprintf(suffix, sizeof(CSV_SUFFIX), ".log");
}
if (gp_log_format == 1 && pg_strcasecmp(suffix, CSV_SUFFIX) != 0)
{
snprintf(suffix, sizeof(CSV_SUFFIX), CSV_SUFFIX);
}
return filename;
}
/*
* Determine the next planned rotation time, and store in next_rotation_time.
*/
static void
set_next_rotation_time(void)
{
pg_time_t now;
struct pg_tm *tm;
int rotinterval;
/* nothing to do if time-based rotation is disabled */
if (Log_RotationAge <= 0)
return;
/*
* The requirements here are to choose the next time > now that is a
* "multiple" of the log rotation interval. "Multiple" can be interpreted
* fairly loosely. In this version we align to log_timezone rather than
* GMT.
*/
rotinterval = Log_RotationAge * SECS_PER_MINUTE; /* convert to seconds */
now = (pg_time_t) time(NULL);
tm = pg_localtime(&now, log_timezone);
now += tm->tm_gmtoff;
now -= now % rotinterval;
now += rotinterval;
now -= tm->tm_gmtoff;
next_rotation_time = now;
}
/* --------------------------------
* signal handler routines
* --------------------------------
*/
/* SIGHUP: set flag to reload config file */
static void
sigHupHandler(SIGNAL_ARGS)
{
got_SIGHUP = true;
}
/* SIGUSR1: set flag to rotate logfile */
static void
sigUsr1Handler(SIGNAL_ARGS)
{
rotation_requested = true;
}