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/*-------------------------------------------------------------------------
*
* pqcomm.h--
* Parameters for the communication module
*
*
* Copyright (c) 1994, Regents of the University of California
*
* pqcomm.h,v 1.4 1995/05/26 22:24:46 jolly Exp
*
* NOTES
* Some of this should move to libpq.h
*
*-------------------------------------------------------------------------
*/
#ifndef PQCOMM_H
#define PQCOMM_H
#include <sys/types.h>
#ifdef WIN32
#include <winsock.h>
#else
#include <netinet/in.h>
#endif /* WIN32 */
#include "postgres.h"
/*
* startup msg parameters: path length, argument string length
*/
#define PATH_SIZE 64
#define ARGV_SIZE 64
typedef enum _MsgType {
ACK_MSG = 0, /* acknowledge a message */
ERROR_MSG=1, /* error response to client from server */
RESET_MSG=2, /* client must reset connection */
PRINT_MSG=3, /* tuples for client from server */
NET_ERROR=4, /* error in net system call */
FUNCTION_MSG=5, /* fastpath call (unused) */
QUERY_MSG=6, /* client query to server */
STARTUP_MSG=7, /* initialize a connection with a backend */
DUPLICATE_MSG=8, /* duplicate msg arrived (errors msg only) */
INVALID_MSG=9, /* for some control functions */
STARTUP_KRB4_MSG=10, /* krb4 session follows startup packet */
STARTUP_KRB5_MSG=11 /* krb5 session follows startup packet */
/* insert new values here -- DO NOT REORDER OR DELETE ENTRIES */
} MsgType;
typedef char *Addr;
typedef int PacketLen; /* packet length */
typedef struct StartupInfo {
/* PacketHdr hdr; */
char database[PATH_SIZE]; /* database name */
char user[NAMEDATALEN]; /* user name */
char options[ARGV_SIZE]; /* possible additional args */
char execFile[ARGV_SIZE]; /* possible backend to use */
char tty[PATH_SIZE]; /* possible tty for debug output*/
} StartupInfo;
/* amount of available data in a packet buffer */
#define MESSAGE_SIZE sizeof(StartupInfo) + 5
/* I/O can be blocking or non-blocking */
#define BLOCKING (FALSE)
#define NON_BLOCKING (TRUE)
/* a PacketBuf gets shipped from client to server so be careful
of differences in representation.
Be sure to use htonl() and ntohl() on the len and msgtype fields! */
typedef struct PacketBuf {
int len;
MsgType msgtype;
char data[MESSAGE_SIZE];
} PacketBuf;
/* update the conversion routines
StartupInfo2PacketBuf() and PacketBuf2StartupInfo() (decl. below)
if StartupInfo or PacketBuf structs ever change */
/*
* socket descriptor port
* we need addresses of both sides to do authentication calls
*/
typedef struct Port {
int sock; /* file descriptor */
int mask; /* select mask */
int nBytes; /* nBytes read in so far */
struct sockaddr_in laddr; /* local addr (us) */
struct sockaddr_in raddr; /* remote addr (them) */
/* PacketBufId id;*/ /* id of packet buf currently in use */
PacketBuf buf; /* stream implementation (curr pack buf) */
} Port;
/* invalid socket descriptor */
#define INVALID_SOCK (-1)
#define INVALID_ID (-1)
#define MAX_CONNECTIONS 10
#define N_PACK_BUFS 20
/* no multi-packet messages yet */
#define MAX_PACKET_BACKLOG 1
#define DEFAULT_STRING ""
extern FILE *Pfout, *Pfin;
extern int PQAsyncNotifyWaiting;
/*
* prototypes for functions in pqpacket.c
*/
extern int PacketReceive(Port *port, PacketBuf *buf, bool nonBlocking);
extern int PacketSend(Port *port, PacketBuf *buf,
PacketLen len, bool nonBlocking);
extern PacketBuf* StartupInfo2PacketBuf(StartupInfo*);
extern StartupInfo* PacketBuf2StartupInfo(PacketBuf*);
#endif /* PQCOMM_H */
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