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/*-------------------------------------------------------------------------
*
* pidfile.h
* Declarations describing the data directory lock file (postmaster.pid)
*
* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/utils/pidfile.h
*
*-------------------------------------------------------------------------
*/
#ifndef UTILS_PIDFILE_H
#define UTILS_PIDFILE_H
/*
* As of Postgres 10, the contents of the data-directory lock file are:
*
* line #
* 1 postmaster PID (or negative of a standalone backend's PID)
* 2 data directory path
* 3 postmaster start timestamp (time_t representation)
* 4 port number
* 5 first Unix socket directory path (empty if none)
* 6 first listen_address (IP address or "*"; empty if no TCP port)
* 7 shared memory key (empty on Windows)
* 8 postmaster status (see values below)
*
* Lines 6 and up are added via AddToDataDirLockFile() after initial file
* creation; also, line 5 is initially empty and is changed after the first
* Unix socket is opened. Onlookers should not assume that lines 4 and up
* are filled in any particular order.
*
* Socket lock file(s), if used, have the same contents as lines 1-5, with
* line 5 being their own directory.
*/
#define LOCK_FILE_LINE_PID 1
#define LOCK_FILE_LINE_DATA_DIR 2
#define LOCK_FILE_LINE_START_TIME 3
#define LOCK_FILE_LINE_PORT 4
#define LOCK_FILE_LINE_SOCKET_DIR 5
#define LOCK_FILE_LINE_LISTEN_ADDR 6
#define LOCK_FILE_LINE_SHMEM_KEY 7
#define LOCK_FILE_LINE_PM_STATUS 8
/*
* The PM_STATUS line may contain one of these values. All these strings
* must be the same length, per comments for AddToDataDirLockFile().
* We pad with spaces as needed to make that true.
*/
#define PM_STATUS_STARTING "starting" /* still starting up */
#define PM_STATUS_STOPPING "stopping" /* in shutdown sequence */
#define PM_STATUS_READY "ready " /* ready for connections */
#define PM_STATUS_STANDBY "standby " /* up, won't accept connections */
#endif /* UTILS_PIDFILE_H */
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