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//usr/include/fastcgi.h

/* 
 * fastcgi.h --
 *
 *	Defines for the FastCGI protocol.
 *
 *
 * Copyright (c) 1995-1996 Open Market, Inc.
 *
 * See the file "LICENSE.TERMS" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * $Id: fastcgi.h,v 1.1.1.1 1997/09/16 15:36:32 stanleyg Exp $
 */

#ifndef _FASTCGI_H
#define _FASTCGI_H

/*
 * Listening socket file number
 */
#define FCGI_LISTENSOCK_FILENO 0

typedef struct {
    unsigned char version;
    unsigned char type;
    unsigned char requestIdB1;
    unsigned char requestIdB0;
    unsigned char contentLengthB1;
    unsigned char contentLengthB0;
    unsigned char paddingLength;
    unsigned char reserved;
} FCGI_Header;

#define FCGI_MAX_LENGTH 0xffff

/*
 * Number of bytes in a FCGI_Header.  Future versions of the protocol
 * will not reduce this number.
 */
#define FCGI_HEADER_LEN  8

/*
 * Value for version component of FCGI_Header
 */
#define FCGI_VERSION_1           1

/*
 * Values for type component of FCGI_Header
 */
#define FCGI_BEGIN_REQUEST       1
#define FCGI_ABORT_REQUEST       2
#define FCGI_END_REQUEST         3
#define FCGI_PARAMS              4
#define FCGI_STDIN               5
#define FCGI_STDOUT              6
#define FCGI_STDERR              7
#define FCGI_DATA                8
#define FCGI_GET_VALUES          9
#define FCGI_GET_VALUES_RESULT  10
#define FCGI_UNKNOWN_TYPE       11
#define FCGI_MAXTYPE (FCGI_UNKNOWN_TYPE)

/*
 * Value for requestId component of FCGI_Header
 */
#define FCGI_NULL_REQUEST_ID     0

typedef struct {
    unsigned char roleB1;
    unsigned char roleB0;
    unsigned char flags;
    unsigned char reserved[5];
} FCGI_BeginRequestBody;

typedef struct {
    FCGI_Header header;
    FCGI_BeginRequestBody body;
} FCGI_BeginRequestRecord;

/*
 * Mask for flags component of FCGI_BeginRequestBody
 */
#define FCGI_KEEP_CONN  1

/*
 * Values for role component of FCGI_BeginRequestBody
 */
#define FCGI_RESPONDER  1
#define FCGI_AUTHORIZER 2
#define FCGI_FILTER     3

typedef struct {
    unsigned char appStatusB3;
    unsigned char appStatusB2;
    unsigned char appStatusB1;
    unsigned char appStatusB0;
    unsigned char protocolStatus;
    unsigned char reserved[3];
} FCGI_EndRequestBody;

typedef struct {
    FCGI_Header header;
    FCGI_EndRequestBody body;
} FCGI_EndRequestRecord;

/*
 * Values for protocolStatus component of FCGI_EndRequestBody
 */
#define FCGI_REQUEST_COMPLETE 0
#define FCGI_CANT_MPX_CONN    1
#define FCGI_OVERLOADED       2
#define FCGI_UNKNOWN_ROLE     3

/*
 * Variable names for FCGI_GET_VALUES / FCGI_GET_VALUES_RESULT records
 */
#define FCGI_MAX_CONNS  "FCGI_MAX_CONNS"
#define FCGI_MAX_REQS   "FCGI_MAX_REQS"
#define FCGI_MPXS_CONNS "FCGI_MPXS_CONNS"

typedef struct {
    unsigned char type;    
    unsigned char reserved[7];
} FCGI_UnknownTypeBody;

typedef struct {
    FCGI_Header header;
    FCGI_UnknownTypeBody body;
} FCGI_UnknownTypeRecord;

#endif	/* _FASTCGI_H */