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cd91de0d17
After a crash of a backend using temporary files, the files used to be left behind, on the basis that it might be useful for debugging. But we don't have any reports of anyone actually doing that, and it means the disk usage may grow over time due to repeated backend failures (possibly even hitting ENOSPC). So this behavior is a bit unfortunate, and fixing it required either manual cleanup (deleting files, which is error-prone) or restart of the instance (i.e. service disruption). This implements automatic cleanup of temporary files, controled by a new GUC remove_temp_files_after_crash. By default the files are removed, but it can be disabled to restore the old behavior if needed. Author: Euler Taveira Reviewed-by: Tomas Vondra, Michael Paquier, Anastasia Lubennikova, Thomas Munro Discussion: https://postgr.es/m/CAH503wDKdYzyq7U-QJqGn%3DGm6XmoK%2B6_6xTJ-Yn5WSvoHLY1Ww%40mail.gmail.com
78 lines
2.6 KiB
C
78 lines
2.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* postmaster.h
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* Exports from postmaster/postmaster.c.
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*
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* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/postmaster/postmaster.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef _POSTMASTER_H
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#define _POSTMASTER_H
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/* GUC options */
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extern bool EnableSSL;
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extern int ReservedBackends;
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extern PGDLLIMPORT int PostPortNumber;
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extern int Unix_socket_permissions;
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extern char *Unix_socket_group;
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extern char *Unix_socket_directories;
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extern char *ListenAddresses;
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extern bool ClientAuthInProgress;
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extern int PreAuthDelay;
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extern int AuthenticationTimeout;
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extern bool Log_connections;
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extern bool log_hostname;
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extern bool enable_bonjour;
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extern char *bonjour_name;
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extern bool restart_after_crash;
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extern bool remove_temp_files_after_crash;
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#ifdef WIN32
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extern HANDLE PostmasterHandle;
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#else
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extern int postmaster_alive_fds[2];
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/*
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* Constants that represent which of postmaster_alive_fds is held by
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* postmaster, and which is used in children to check for postmaster death.
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*/
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#define POSTMASTER_FD_WATCH 0 /* used in children to check for
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* postmaster death */
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#define POSTMASTER_FD_OWN 1 /* kept open by postmaster only */
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#endif
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extern PGDLLIMPORT const char *progname;
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extern void PostmasterMain(int argc, char *argv[]) pg_attribute_noreturn();
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extern void ClosePostmasterPorts(bool am_syslogger);
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extern void InitProcessGlobals(void);
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extern int MaxLivePostmasterChildren(void);
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extern bool PostmasterMarkPIDForWorkerNotify(int);
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#ifdef EXEC_BACKEND
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extern pid_t postmaster_forkexec(int argc, char *argv[]);
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extern void SubPostmasterMain(int argc, char *argv[]) pg_attribute_noreturn();
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extern Size ShmemBackendArraySize(void);
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extern void ShmemBackendArrayAllocation(void);
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#endif
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/*
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* Note: MAX_BACKENDS is limited to 2^18-1 because that's the width reserved
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* for buffer references in buf_internals.h. This limitation could be lifted
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* by using a 64bit state; but it's unlikely to be worthwhile as 2^18-1
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* backends exceed currently realistic configurations. Even if that limitation
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* were removed, we still could not a) exceed 2^23-1 because inval.c stores
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* the backend ID as a 3-byte signed integer, b) INT_MAX/4 because some places
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* compute 4*MaxBackends without any overflow check. This is rechecked in the
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* relevant GUC check hooks and in RegisterBackgroundWorker().
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*/
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#define MAX_BACKENDS 0x3FFFF
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#endif /* _POSTMASTER_H */
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