fcgiapp.h

FastCGI,语言无关的、可伸缩架构的CGI开放扩展

/*
 * fcgiapp.h --
 *
 *      Definitions for FastCGI application server programs
 *
 *
 * Copyright (c) 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: fcgiapp.h,v 1.12 2001/11/21 21:10:11 robs Exp $
 */

#ifndef _FCGIAPP_H
#define _FCGIAPP_H

/* Hack to see if we are building TCL - TCL needs varargs not stdarg */
#ifndef TCL_LIBRARY
#include <stdarg.h>
#else
#include <varargs.h>
#endif

#ifndef DLLAPI
#ifdef _WIN32
#define DLLAPI __declspec(dllimport)
#else
#define DLLAPI
#endif
#endif

#if defined (c_plusplus) || defined (__cplusplus)
extern "C" {
#endif

/*
 * Error codes.  Assigned to avoid conflict with EOF and errno(2).
 */
#define FCGX_UNSUPPORTED_VERSION -2
#define FCGX_PROTOCOL_ERROR -3
#define FCGX_PARAMS_ERROR -4
#define FCGX_CALL_SEQ_ERROR -5

/*
 * This structure defines the state of a FastCGI stream.
 * Streams are modeled after the FILE type defined in stdio.h.
 * (We wouldn't need our own if platform vendors provided a
 * standard way to subclass theirs.)
 * The state of a stream is private and should only be accessed
 * by the procedures defined below.
 */
typedef struct FCGX_Stream {
    unsigned char *rdNext;    /* reader: first valid byte
                               * writer: equals stop */
    unsigned char *wrNext;    /* writer: first free byte
                               * reader: equals stop */
    unsigned char *stop;      /* reader: last valid byte + 1
                               * writer: last free byte + 1 */
    unsigned char *stopUnget; /* reader: first byte of current buffer
                               * fragment, for ungetc
                               * writer: undefined */
    int isReader;
    int isClosed;
    int wasFCloseCalled;
    int FCGI_errno;                /* error status */
    void (*fillBuffProc) (struct FCGX_Stream *stream);
    void (*emptyBuffProc) (struct FCGX_Stream *stream, int doClose);
    void *data;
} FCGX_Stream;

/*
 * An environment (as defined by environ(7)): A NULL-terminated array
 * of strings, each string having the form name=value.
 */
typedef char **FCGX_ParamArray;

/*
 * FCGX_Request Flags
 *
 * Setting FCGI_FAIL_ACCEPT_ON_INTR prevents FCGX_Accept() from
 * restarting upon being interrupted.
 */
#define FCGI_FAIL_ACCEPT_ON_INTR	1

/*
 * FCGX_Request -- State associated with a request.
 *
 * Its exposed for API simplicity, I expect parts of it to change!
 */
typedef struct FCGX_Request {
    int requestId;            /* valid if isBeginProcessed */
    int role;
    FCGX_Stream *in;
    FCGX_Stream *out;
    FCGX_Stream *err;
	char **envp;

	/* Don't use anything below here */

    struct Params *paramsPtr;
    int ipcFd;               /* < 0 means no connection */
    int isBeginProcessed;     /* FCGI_BEGIN_REQUEST seen */
    int keepConnection;       /* don't close ipcFd at end of request */
    int appStatus;
    int nWriters;             /* number of open writers (0..2) */
	int flags;
	int listen_sock;
} FCGX_Request;


/*
 *======================================================================
 * Control
 *======================================================================
 */

/*
 *----------------------------------------------------------------------
 *
 * FCGX_IsCGI --
 *
 *      Returns TRUE iff this process appears to be a CGI process
 *      rather than a FastCGI process.
 *
 *----------------------------------------------------------------------
 */
DLLAPI int FCGX_IsCGI(void);

/*
 *----------------------------------------------------------------------
 *
 * FCGX_Init --
 *
 *      Initialize the FCGX library.  Call in multi-threaded apps
 *      before calling FCGX_Accept_r().
 *
 *      Returns 0 upon success.
 *
 *----------------------------------------------------------------------
 */
DLLAPI int FCGX_Init(void);

/*
 *----------------------------------------------------------------------
 *
 * FCGX_OpenSocket --
 *
 *	Create a FastCGI listen socket.
 *
 *	path is the Unix domain socket (named pipe for WinNT), or a colon
 *	followed by a port number.  e.g. "/tmp/fastcgi/mysocket", ":5000"
 *
 *	backlog is the listen queue depth used in the listen() call.
 *
 *  Returns the socket's file descriptor or -1 on error.
 *
 *----------------------------------------------------------------------
 */
DLLAPI int FCGX_OpenSocket(const char *path, int backlog);

/*
 *----------------------------------------------------------------------
 *
 * FCGX_InitRequest --
 *
 *	Initialize a FCGX_Request for use with FCGX_Accept_r().
 *
 * 	sock is a file descriptor returned by FCGX_OpenSocket() or 0 (default).
 * 	The only supported flag at this time is FCGI_FAIL_ON_INTR.
 *
 * 	Returns 0 upon success.
 *----------------------------------------------------------------------
 */
DLLAPI int FCGX_InitRequest(FCGX_Request *request, int sock, int flags);

/*
 *----------------------------------------------------------------------
 *
 * FCGX_Accept_r --
 *
 *      Accept a new request (multi-thread safe).  Be sure to call
 * 	FCGX_Init() first.
 *
 * Results:
 *	0 for successful call, -1 for error.
 *
 * Side effects:
 *
 *      Finishes the request accepted by (and frees any
 *      storage allocated by) the previous call to FCGX_Accept.
 *      Creates input, output, and error streams and
 *      assigns them to *in, *out, and *err respectively.
 *      Creates a parameters data structure to be accessed
 *      via getenv(3) (if assigned to environ) or by FCGX_GetParam
 *      and assigns it to *envp.
 *
 *      DO NOT retain pointers to the envp array or any strings
 *      contained in it (e.g. to the result of calling FCGX_GetParam),
 *      since these will be freed by the next call to FCGX_Finish
 *      or FCGX_Accept.
 *
 *	DON'T use the FCGX_Request, its structure WILL change.
 *
 *----------------------------------------------------------------------
 */
DLLAPI int FCGX_Accept_r(FCGX_Request *request);

/*
 *----------------------------------------------------------------------
 *
 * FCGX_Finish_r --
 *
 *      Finish the request (multi-thread safe).
 *
 * Side effects:
 *
 *      Finishes the request accepted by (and frees any
 *      storage allocated by) the previous call to FCGX_Accept.
 *
 *      DO NOT retain pointers to the envp array or any strings
 *      contained in it (e.g. to the result of calling FCGX_GetParam),
 *      since these will be freed by the next call to FCGX_Finish
 *      or FCGX_Accept.
 *
 *----------------------------------------------------------------------
 */
DLLAPI void FCGX_Finish_r(FCGX_Request *request);

/*
 *----------------------------------------------------------------------
 *
 * FCGX_Free --
 *
 *      Free the memory and, if close is true, 
 *	    IPC FD associated with the request (multi-thread safe).
 *
 *----------------------------------------------------------------------
 */
DLLAPI void FCGX_Free(FCGX_Request * request, int close);

/*
 *----------------------------------------------------------------------
 *
 * FCGX_Accept --
 *
 *      Accept a new request (NOT multi-thread safe).
 *
 * Results:
 *	0 for successful call, -1 for error.
 *
 * Side effects:
 *
 *      Finishes the request accepted by (and frees any
 *      storage allocated by) the previous call to FCGX_Accept.
 *      Creates input, output, and error streams and
 *      assigns them to *in, *out, and *err respectively.
 *      Creates a parameters data structure to be accessed
 *      via getenv(3) (if assigned to environ) or by FCGX_GetParam
 *      and assigns it to *envp.
 *
 *      DO NOT retain pointers to the envp array or any strings
 *      contained in it (e.g. to the result of calling FCGX_GetParam),
 *      since these will be freed by the next call to FCGX_Finish
 *      or FCGX_Accept.
 *
 *----------------------------------------------------------------------
 */
DLLAPI int FCGX_Accept(
        FCGX_Stream **in,
        FCGX_Stream **out,
        FCGX_Stream **err,
        FCGX_ParamArray *envp);

/*
 *----------------------------------------------------------------------
 *
 * FCGX_Finish --
 *
 *      Finish the current request (NOT multi-thread safe).
 *
 * Side effects:
 *
 *      Finishes the request accepted by (and frees any
 *      storage allocated by) the previous call to FCGX_Accept.
 *
 *      DO NOT retain pointers to the envp array or any strings
 *      contained in it (e.g. to the result of calling FCGX_GetParam),
 *      since these will be freed by the next call to FCGX_Finish
 *      or FCGX_Accept.
 *
 *----------------------------------------------------------------------
 */
DLLAPI void FCGX_Finish(void);

/*
 *----------------------------------------------------------------------
 *
 * FCGX_StartFilterData --
 *
 *      stream is an input stream for a FCGI_FILTER request.
 *      stream is positioned at EOF on FCGI_STDIN.
 *      Repositions stream to the start of FCGI_DATA.
 *      If the preconditions are not met (e.g. FCGI_STDIN has not
 *      been read to EOF) sets the stream error code to
 *      FCGX_CALL_SEQ_ERROR.
 *
 * Results:
 *      0 for a normal return, < 0 for error
 *
 *----------------------------------------------------------------------
 */