From 46651ce6fe013220ed397add242004d764fc0153 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 4 May 2024 14:15:05 +0200 Subject: Adding upstream version 14.5. Signed-off-by: Daniel Baumann --- src/include/postmaster/syslogger.h | 98 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 98 insertions(+) create mode 100644 src/include/postmaster/syslogger.h (limited to 'src/include/postmaster/syslogger.h') diff --git a/src/include/postmaster/syslogger.h b/src/include/postmaster/syslogger.h new file mode 100644 index 0000000..1491eec --- /dev/null +++ b/src/include/postmaster/syslogger.h @@ -0,0 +1,98 @@ +/*------------------------------------------------------------------------- + * + * syslogger.h + * Exports from postmaster/syslogger.c. + * + * Copyright (c) 2004-2021, PostgreSQL Global Development Group + * + * src/include/postmaster/syslogger.h + * + *------------------------------------------------------------------------- + */ +#ifndef _SYSLOGGER_H +#define _SYSLOGGER_H + +#include /* for PIPE_BUF */ + + +/* + * Primitive protocol structure for writing to syslogger pipe(s). The idea + * here is to divide long messages into chunks that are not more than + * PIPE_BUF bytes long, which according to POSIX spec must be written into + * the pipe atomically. The pipe reader then uses the protocol headers to + * reassemble the parts of a message into a single string. The reader can + * also cope with non-protocol data coming down the pipe, though we cannot + * guarantee long strings won't get split apart. + * + * We use non-nul bytes in is_last to make the protocol a tiny bit + * more robust against finding a false double nul byte prologue. But + * we still might find it in the len and/or pid bytes unless we're careful. + */ + +#ifdef PIPE_BUF +/* Are there any systems with PIPE_BUF > 64K? Unlikely, but ... */ +#if PIPE_BUF > 65536 +#define PIPE_CHUNK_SIZE 65536 +#else +#define PIPE_CHUNK_SIZE ((int) PIPE_BUF) +#endif +#else /* not defined */ +/* POSIX says the value of PIPE_BUF must be at least 512, so use that */ +#define PIPE_CHUNK_SIZE 512 +#endif + +typedef struct +{ + char nuls[2]; /* always \0\0 */ + uint16 len; /* size of this chunk (counts data only) */ + int32 pid; /* writer's pid */ + char is_last; /* last chunk of message? 't' or 'f' ('T' or + * 'F' for CSV case) */ + char data[FLEXIBLE_ARRAY_MEMBER]; /* data payload starts here */ +} PipeProtoHeader; + +typedef union +{ + PipeProtoHeader proto; + char filler[PIPE_CHUNK_SIZE]; +} PipeProtoChunk; + +#define PIPE_HEADER_SIZE offsetof(PipeProtoHeader, data) +#define PIPE_MAX_PAYLOAD ((int) (PIPE_CHUNK_SIZE - PIPE_HEADER_SIZE)) + + +/* GUC options */ +extern bool Logging_collector; +extern int Log_RotationAge; +extern int Log_RotationSize; +extern PGDLLIMPORT char *Log_directory; +extern PGDLLIMPORT char *Log_filename; +extern bool Log_truncate_on_rotation; +extern int Log_file_mode; + +#ifndef WIN32 +extern int syslogPipe[2]; +#else +extern HANDLE syslogPipe[2]; +#endif + + +extern int SysLogger_Start(void); + +extern void write_syslogger_file(const char *buffer, int count, int dest); + +#ifdef EXEC_BACKEND +extern void SysLoggerMain(int argc, char *argv[]) pg_attribute_noreturn(); +#endif + +extern bool CheckLogrotateSignal(void); +extern void RemoveLogrotateSignalFiles(void); + +/* + * Name of files saving meta-data information about the log + * files currently in use by the syslogger + */ +#define LOG_METAINFO_DATAFILE "current_logfiles" +#define LOG_METAINFO_DATAFILE_TMP LOG_METAINFO_DATAFILE ".tmp" + +#endif /* _SYSLOGGER_H */ -- cgit v1.2.3