backend_startup.h

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/*-------------------------------------------------------------------------
 *
 * backend_startup.h
 *    prototypes for backend_startup.c.
 *
 *
 * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/tcop/backend_startup.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef BACKEND_STARTUP_H
#define BACKEND_STARTUP_H
 
/*
 * CAC_state is passed from postmaster to the backend process, to indicate
 * whether the connection should be accepted, or if the process should just
 * send an error to the client and close the connection.  Note that the
 * connection can fail for various reasons even if postmaster passed CAC_OK.
 */
typedef enum CAC_state
{
    CAC_OK,
    CAC_STARTUP,
    CAC_SHUTDOWN,
    CAC_RECOVERY,
    CAC_NOTCONSISTENT,
    CAC_TOOMANY,
} CAC_state;
 
/* Information passed from postmaster to backend process in 'startup_data' */
typedef struct BackendStartupData
{
    CAC_state   canAcceptConnections;
} BackendStartupData;
 
extern void BackendMain(char *startup_data, size_t startup_data_len) pg_attribute_noreturn();
 
#endif                          /* BACKEND_STARTUP_H */