1 files changed, 56 insertions, 0 deletions
diff --git a/src/include/utils/pidfile.h b/src/include/utils/pidfile.h
new file mode 100644
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--- /dev/null
+++ b/src/include/utils/pidfile.h
@@ -0,0 +1,56 @@
+/*-------------------------------------------------------------------------
+ *
+ * pidfile.h
+ *	  Declarations describing the data directory lock file (postmaster.pid)
+ *
+ * Portions Copyright (c) 1996-2020, 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 */