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Previously we did this after InitPostgres, at a somewhat randomly chosen place within PostgresMain. However, since commita0ffa885e
doing this outside a transaction can cause a crash, if we need to check permissions while replacing a placeholder GUC. (Besides which, a preloaded library could itself want to do database access within _PG_init.) To avoid needing an additional transaction start/end in every session, move the process_session_preload_libraries call to within InitPostgres's transaction. That requires teaching the code not to call it when InitPostgres is called from somewhere other than PostgresMain, since we don't want session_preload_libraries to affect background workers. The most future-proof solution here seems to be to add an additional flag parameter to InitPostgres; fortunately, we're not yet very worried about API stability for v15. Doing this also exposed the fact that we're currently honoring session_preload_libraries in walsenders, even those not connected to any database. This seems, at minimum, a POLA violation: walsenders are not interactive sessions. Let's stop doing that. (All these comments also apply to local_preload_libraries, of course.) Per report from Gurjeet Singh (thanks also to Nathan Bossart and Kyotaro Horiguchi for review). Backpatch to v15 wherea0ffa885e
came in. Discussion: https://postgr.es/m/CABwTF4VEpwTHhRQ+q5MiC5ucngN-whN-PdcKeufX7eLSoAfbZA@mail.gmail.com
488 lines
17 KiB
C
488 lines
17 KiB
C
/*-------------------------------------------------------------------------
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*
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* miscadmin.h
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* This file contains general postgres administration and initialization
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* stuff that used to be spread out between the following files:
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* globals.h global variables
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* pdir.h directory path crud
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* pinit.h postgres initialization
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* pmod.h processing modes
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* Over time, this has also become the preferred place for widely known
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* resource-limitation stuff, such as work_mem and check_stack_depth().
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*
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* Portions Copyright (c) 1996-2022, 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/miscadmin.h
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*
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* NOTES
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* some of the information in this file should be moved to other files.
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef MISCADMIN_H
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#define MISCADMIN_H
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#include <signal.h>
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#include "datatype/timestamp.h" /* for TimestampTz */
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#include "pgtime.h" /* for pg_time_t */
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#define InvalidPid (-1)
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/*****************************************************************************
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* System interrupt and critical section handling
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*
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* There are two types of interrupts that a running backend needs to accept
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* without messing up its state: QueryCancel (SIGINT) and ProcDie (SIGTERM).
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* In both cases, we need to be able to clean up the current transaction
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* gracefully, so we can't respond to the interrupt instantaneously ---
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* there's no guarantee that internal data structures would be self-consistent
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* if the code is interrupted at an arbitrary instant. Instead, the signal
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* handlers set flags that are checked periodically during execution.
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*
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* The CHECK_FOR_INTERRUPTS() macro is called at strategically located spots
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* where it is normally safe to accept a cancel or die interrupt. In some
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* cases, we invoke CHECK_FOR_INTERRUPTS() inside low-level subroutines that
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* might sometimes be called in contexts that do *not* want to allow a cancel
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* or die interrupt. The HOLD_INTERRUPTS() and RESUME_INTERRUPTS() macros
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* allow code to ensure that no cancel or die interrupt will be accepted,
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* even if CHECK_FOR_INTERRUPTS() gets called in a subroutine. The interrupt
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* will be held off until CHECK_FOR_INTERRUPTS() is done outside any
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* HOLD_INTERRUPTS() ... RESUME_INTERRUPTS() section.
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*
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* There is also a mechanism to prevent query cancel interrupts, while still
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* allowing die interrupts: HOLD_CANCEL_INTERRUPTS() and
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* RESUME_CANCEL_INTERRUPTS().
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*
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* Note that ProcessInterrupts() has also acquired a number of tasks that
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* do not necessarily cause a query-cancel-or-die response. Hence, it's
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* possible that it will just clear InterruptPending and return.
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*
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* INTERRUPTS_PENDING_CONDITION() can be checked to see whether an
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* interrupt needs to be serviced, without trying to do so immediately.
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* Some callers are also interested in INTERRUPTS_CAN_BE_PROCESSED(),
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* which tells whether ProcessInterrupts is sure to clear the interrupt.
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*
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* Special mechanisms are used to let an interrupt be accepted when we are
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* waiting for a lock or when we are waiting for command input (but, of
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* course, only if the interrupt holdoff counter is zero). See the
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* related code for details.
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*
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* A lost connection is handled similarly, although the loss of connection
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* does not raise a signal, but is detected when we fail to write to the
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* socket. If there was a signal for a broken connection, we could make use of
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* it by setting ClientConnectionLost in the signal handler.
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*
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* A related, but conceptually distinct, mechanism is the "critical section"
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* mechanism. A critical section not only holds off cancel/die interrupts,
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* but causes any ereport(ERROR) or ereport(FATAL) to become ereport(PANIC)
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* --- that is, a system-wide reset is forced. Needless to say, only really
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* *critical* code should be marked as a critical section! Currently, this
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* mechanism is only used for XLOG-related code.
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*
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*****************************************************************************/
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/* in globals.c */
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/* these are marked volatile because they are set by signal handlers: */
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extern PGDLLIMPORT volatile sig_atomic_t InterruptPending;
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extern PGDLLIMPORT volatile sig_atomic_t QueryCancelPending;
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extern PGDLLIMPORT volatile sig_atomic_t ProcDiePending;
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extern PGDLLIMPORT volatile sig_atomic_t IdleInTransactionSessionTimeoutPending;
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extern PGDLLIMPORT volatile sig_atomic_t IdleSessionTimeoutPending;
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extern PGDLLIMPORT volatile sig_atomic_t ProcSignalBarrierPending;
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extern PGDLLIMPORT volatile sig_atomic_t LogMemoryContextPending;
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extern PGDLLIMPORT volatile sig_atomic_t IdleStatsUpdateTimeoutPending;
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extern PGDLLIMPORT volatile sig_atomic_t CheckClientConnectionPending;
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extern PGDLLIMPORT volatile sig_atomic_t ClientConnectionLost;
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/* these are marked volatile because they are examined by signal handlers: */
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extern PGDLLIMPORT volatile uint32 InterruptHoldoffCount;
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extern PGDLLIMPORT volatile uint32 QueryCancelHoldoffCount;
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extern PGDLLIMPORT volatile uint32 CritSectionCount;
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/* in tcop/postgres.c */
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extern void ProcessInterrupts(void);
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/* Test whether an interrupt is pending */
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#ifndef WIN32
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#define INTERRUPTS_PENDING_CONDITION() \
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(unlikely(InterruptPending))
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#else
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#define INTERRUPTS_PENDING_CONDITION() \
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(unlikely(UNBLOCKED_SIGNAL_QUEUE()) ? pgwin32_dispatch_queued_signals() : 0, \
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unlikely(InterruptPending))
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#endif
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/* Service interrupt, if one is pending and it's safe to service it now */
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#define CHECK_FOR_INTERRUPTS() \
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do { \
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if (INTERRUPTS_PENDING_CONDITION()) \
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ProcessInterrupts(); \
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} while(0)
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/* Is ProcessInterrupts() guaranteed to clear InterruptPending? */
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#define INTERRUPTS_CAN_BE_PROCESSED() \
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(InterruptHoldoffCount == 0 && CritSectionCount == 0 && \
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QueryCancelHoldoffCount == 0)
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#define HOLD_INTERRUPTS() (InterruptHoldoffCount++)
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#define RESUME_INTERRUPTS() \
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do { \
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Assert(InterruptHoldoffCount > 0); \
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InterruptHoldoffCount--; \
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} while(0)
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#define HOLD_CANCEL_INTERRUPTS() (QueryCancelHoldoffCount++)
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#define RESUME_CANCEL_INTERRUPTS() \
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do { \
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Assert(QueryCancelHoldoffCount > 0); \
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QueryCancelHoldoffCount--; \
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} while(0)
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#define START_CRIT_SECTION() (CritSectionCount++)
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#define END_CRIT_SECTION() \
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do { \
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Assert(CritSectionCount > 0); \
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CritSectionCount--; \
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} while(0)
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/*****************************************************************************
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* globals.h -- *
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*****************************************************************************/
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/*
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* from utils/init/globals.c
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*/
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extern PGDLLIMPORT pid_t PostmasterPid;
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extern PGDLLIMPORT bool IsPostmasterEnvironment;
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extern PGDLLIMPORT bool IsUnderPostmaster;
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extern PGDLLIMPORT bool IsBackgroundWorker;
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extern PGDLLIMPORT bool IsBinaryUpgrade;
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extern PGDLLIMPORT bool ExitOnAnyError;
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extern PGDLLIMPORT char *DataDir;
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extern PGDLLIMPORT int data_directory_mode;
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extern PGDLLIMPORT int NBuffers;
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extern PGDLLIMPORT int MaxBackends;
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extern PGDLLIMPORT int MaxConnections;
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extern PGDLLIMPORT int max_worker_processes;
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extern PGDLLIMPORT int max_parallel_workers;
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extern PGDLLIMPORT int MyProcPid;
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extern PGDLLIMPORT pg_time_t MyStartTime;
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extern PGDLLIMPORT TimestampTz MyStartTimestamp;
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extern PGDLLIMPORT struct Port *MyProcPort;
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extern PGDLLIMPORT struct Latch *MyLatch;
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extern PGDLLIMPORT int32 MyCancelKey;
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extern PGDLLIMPORT int MyPMChildSlot;
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extern PGDLLIMPORT char OutputFileName[];
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extern PGDLLIMPORT char my_exec_path[];
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extern PGDLLIMPORT char pkglib_path[];
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#ifdef EXEC_BACKEND
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extern PGDLLIMPORT char postgres_exec_path[];
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#endif
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/*
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* done in storage/backendid.h for now.
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*
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* extern BackendId MyBackendId;
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*/
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extern PGDLLIMPORT Oid MyDatabaseId;
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extern PGDLLIMPORT Oid MyDatabaseTableSpace;
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/*
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* Date/Time Configuration
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*
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* DateStyle defines the output formatting choice for date/time types:
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* USE_POSTGRES_DATES specifies traditional Postgres format
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* USE_ISO_DATES specifies ISO-compliant format
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* USE_SQL_DATES specifies Oracle/Ingres-compliant format
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* USE_GERMAN_DATES specifies German-style dd.mm/yyyy
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*
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* DateOrder defines the field order to be assumed when reading an
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* ambiguous date (anything not in YYYY-MM-DD format, with a four-digit
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* year field first, is taken to be ambiguous):
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* DATEORDER_YMD specifies field order yy-mm-dd
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* DATEORDER_DMY specifies field order dd-mm-yy ("European" convention)
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* DATEORDER_MDY specifies field order mm-dd-yy ("US" convention)
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*
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* In the Postgres and SQL DateStyles, DateOrder also selects output field
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* order: day comes before month in DMY style, else month comes before day.
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*
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* The user-visible "DateStyle" run-time parameter subsumes both of these.
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*/
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/* valid DateStyle values */
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#define USE_POSTGRES_DATES 0
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#define USE_ISO_DATES 1
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#define USE_SQL_DATES 2
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#define USE_GERMAN_DATES 3
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#define USE_XSD_DATES 4
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/* valid DateOrder values */
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#define DATEORDER_YMD 0
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#define DATEORDER_DMY 1
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#define DATEORDER_MDY 2
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extern PGDLLIMPORT int DateStyle;
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extern PGDLLIMPORT int DateOrder;
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/*
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* IntervalStyles
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* INTSTYLE_POSTGRES Like Postgres < 8.4 when DateStyle = 'iso'
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* INTSTYLE_POSTGRES_VERBOSE Like Postgres < 8.4 when DateStyle != 'iso'
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* INTSTYLE_SQL_STANDARD SQL standard interval literals
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* INTSTYLE_ISO_8601 ISO-8601-basic formatted intervals
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*/
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#define INTSTYLE_POSTGRES 0
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#define INTSTYLE_POSTGRES_VERBOSE 1
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#define INTSTYLE_SQL_STANDARD 2
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#define INTSTYLE_ISO_8601 3
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extern PGDLLIMPORT int IntervalStyle;
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#define MAXTZLEN 10 /* max TZ name len, not counting tr. null */
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extern PGDLLIMPORT bool enableFsync;
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extern PGDLLIMPORT bool allowSystemTableMods;
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extern PGDLLIMPORT int work_mem;
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extern PGDLLIMPORT double hash_mem_multiplier;
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extern PGDLLIMPORT int maintenance_work_mem;
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extern PGDLLIMPORT int max_parallel_maintenance_workers;
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extern PGDLLIMPORT int VacuumCostPageHit;
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extern PGDLLIMPORT int VacuumCostPageMiss;
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extern PGDLLIMPORT int VacuumCostPageDirty;
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extern PGDLLIMPORT int VacuumCostLimit;
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extern PGDLLIMPORT double VacuumCostDelay;
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extern PGDLLIMPORT int64 VacuumPageHit;
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extern PGDLLIMPORT int64 VacuumPageMiss;
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extern PGDLLIMPORT int64 VacuumPageDirty;
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extern PGDLLIMPORT int VacuumCostBalance;
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extern PGDLLIMPORT bool VacuumCostActive;
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/* in tcop/postgres.c */
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typedef char *pg_stack_base_t;
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extern pg_stack_base_t set_stack_base(void);
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extern void restore_stack_base(pg_stack_base_t base);
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extern void check_stack_depth(void);
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extern bool stack_is_too_deep(void);
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/* in tcop/utility.c */
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extern void PreventCommandIfReadOnly(const char *cmdname);
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extern void PreventCommandIfParallelMode(const char *cmdname);
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extern void PreventCommandDuringRecovery(const char *cmdname);
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/* in utils/misc/guc.c */
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extern PGDLLIMPORT int trace_recovery_messages;
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extern int trace_recovery(int trace_level);
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/*****************************************************************************
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* pdir.h -- *
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* POSTGRES directory path definitions. *
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*****************************************************************************/
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/* flags to be OR'd to form sec_context */
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#define SECURITY_LOCAL_USERID_CHANGE 0x0001
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#define SECURITY_RESTRICTED_OPERATION 0x0002
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#define SECURITY_NOFORCE_RLS 0x0004
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extern PGDLLIMPORT char *DatabasePath;
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/* now in utils/init/miscinit.c */
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extern void InitPostmasterChild(void);
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extern void InitStandaloneProcess(const char *argv0);
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extern void SwitchToSharedLatch(void);
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extern void SwitchBackToLocalLatch(void);
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typedef enum BackendType
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{
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B_INVALID = 0,
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B_AUTOVAC_LAUNCHER,
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B_AUTOVAC_WORKER,
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B_BACKEND,
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B_BG_WORKER,
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B_BG_WRITER,
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B_CHECKPOINTER,
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B_STARTUP,
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B_WAL_RECEIVER,
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B_WAL_SENDER,
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B_WAL_WRITER,
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B_ARCHIVER,
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B_LOGGER,
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} BackendType;
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extern PGDLLIMPORT BackendType MyBackendType;
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extern const char *GetBackendTypeDesc(BackendType backendType);
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extern void SetDatabasePath(const char *path);
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extern void checkDataDir(void);
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extern void SetDataDir(const char *dir);
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extern void ChangeToDataDir(void);
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extern char *GetUserNameFromId(Oid roleid, bool noerr);
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extern Oid GetUserId(void);
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extern Oid GetOuterUserId(void);
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extern Oid GetSessionUserId(void);
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extern Oid GetAuthenticatedUserId(void);
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extern void GetUserIdAndSecContext(Oid *userid, int *sec_context);
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extern void SetUserIdAndSecContext(Oid userid, int sec_context);
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extern bool InLocalUserIdChange(void);
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extern bool InSecurityRestrictedOperation(void);
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extern bool InNoForceRLSOperation(void);
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extern void GetUserIdAndContext(Oid *userid, bool *sec_def_context);
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extern void SetUserIdAndContext(Oid userid, bool sec_def_context);
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extern void InitializeSessionUserId(const char *rolename, Oid useroid);
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extern void InitializeSessionUserIdStandalone(void);
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extern void SetSessionAuthorization(Oid userid, bool is_superuser);
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extern Oid GetCurrentRoleId(void);
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extern void SetCurrentRoleId(Oid roleid, bool is_superuser);
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/* in utils/misc/superuser.c */
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extern bool superuser(void); /* current user is superuser */
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extern bool superuser_arg(Oid roleid); /* given user is superuser */
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/*****************************************************************************
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* pmod.h -- *
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* POSTGRES processing mode definitions. *
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*****************************************************************************/
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/*
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* Description:
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* There are three processing modes in POSTGRES. They are
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* BootstrapProcessing or "bootstrap," InitProcessing or
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* "initialization," and NormalProcessing or "normal."
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*
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* The first two processing modes are used during special times. When the
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* system state indicates bootstrap processing, transactions are all given
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* transaction id "one" and are consequently guaranteed to commit. This mode
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* is used during the initial generation of template databases.
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*
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* Initialization mode: used while starting a backend, until all normal
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* initialization is complete. Some code behaves differently when executed
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* in this mode to enable system bootstrapping.
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*
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* If a POSTGRES backend process is in normal mode, then all code may be
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* executed normally.
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*/
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typedef enum ProcessingMode
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{
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BootstrapProcessing, /* bootstrap creation of template database */
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InitProcessing, /* initializing system */
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NormalProcessing /* normal processing */
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} ProcessingMode;
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extern PGDLLIMPORT ProcessingMode Mode;
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#define IsBootstrapProcessingMode() (Mode == BootstrapProcessing)
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#define IsInitProcessingMode() (Mode == InitProcessing)
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#define IsNormalProcessingMode() (Mode == NormalProcessing)
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#define GetProcessingMode() Mode
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#define SetProcessingMode(mode) \
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do { \
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AssertArg((mode) == BootstrapProcessing || \
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(mode) == InitProcessing || \
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(mode) == NormalProcessing); \
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Mode = (mode); \
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} while(0)
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/*
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* Auxiliary-process type identifiers. These used to be in bootstrap.h
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* but it seems saner to have them here, with the ProcessingMode stuff.
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* The MyAuxProcType global is defined and set in auxprocess.c.
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*
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* Make sure to list in the glossary any items you add here.
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*/
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typedef enum
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{
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NotAnAuxProcess = -1,
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StartupProcess = 0,
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BgWriterProcess,
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ArchiverProcess,
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CheckpointerProcess,
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WalWriterProcess,
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WalReceiverProcess,
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NUM_AUXPROCTYPES /* Must be last! */
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} AuxProcType;
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extern PGDLLIMPORT AuxProcType MyAuxProcType;
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#define AmStartupProcess() (MyAuxProcType == StartupProcess)
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#define AmBackgroundWriterProcess() (MyAuxProcType == BgWriterProcess)
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#define AmArchiverProcess() (MyAuxProcType == ArchiverProcess)
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#define AmCheckpointerProcess() (MyAuxProcType == CheckpointerProcess)
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#define AmWalWriterProcess() (MyAuxProcType == WalWriterProcess)
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#define AmWalReceiverProcess() (MyAuxProcType == WalReceiverProcess)
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/*****************************************************************************
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* pinit.h -- *
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* POSTGRES initialization and cleanup definitions. *
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*****************************************************************************/
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/* in utils/init/postinit.c */
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extern void pg_split_opts(char **argv, int *argcp, const char *optstr);
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extern void InitializeMaxBackends(void);
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extern void InitPostgres(const char *in_dbname, Oid dboid,
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const char *username, Oid useroid,
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bool load_session_libraries,
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bool override_allow_connections,
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char *out_dbname);
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extern void BaseInit(void);
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/* in utils/init/miscinit.c */
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extern PGDLLIMPORT bool IgnoreSystemIndexes;
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extern PGDLLIMPORT bool process_shared_preload_libraries_in_progress;
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extern PGDLLIMPORT bool process_shared_preload_libraries_done;
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extern PGDLLIMPORT bool process_shmem_requests_in_progress;
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extern PGDLLIMPORT char *session_preload_libraries_string;
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extern PGDLLIMPORT char *shared_preload_libraries_string;
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extern PGDLLIMPORT char *local_preload_libraries_string;
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extern void CreateDataDirLockFile(bool amPostmaster);
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extern void CreateSocketLockFile(const char *socketfile, bool amPostmaster,
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const char *socketDir);
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extern void TouchSocketLockFiles(void);
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extern void AddToDataDirLockFile(int target_line, const char *str);
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extern bool RecheckDataDirLockFile(void);
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extern void ValidatePgVersion(const char *path);
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extern void process_shared_preload_libraries(void);
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extern void process_session_preload_libraries(void);
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extern void process_shmem_requests(void);
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extern void pg_bindtextdomain(const char *domain);
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extern bool has_rolreplication(Oid roleid);
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typedef void (*shmem_request_hook_type) (void);
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extern PGDLLIMPORT shmem_request_hook_type shmem_request_hook;
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/* in executor/nodeHash.c */
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extern size_t get_hash_memory_limit(void);
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#endif /* MISCADMIN_H */
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