FCGI_Accept man page

NAME
    FCGI_Accept, FCGI_ToFILE, FCGI_ToFcgiStream
        - fcgi_stdio compatibility library

SYNOPSIS
    #include "fcgi_stdio.h"

    int
    FCGI_Accept(void);

    FILE *
    FCGI_ToFILE(FCGI_FILE *);

    FCGI_Stream *
    FCGI_ToFcgiStream(FCGI_FILE *);

DESCRIPTION
    The FCGI_Accept function accepts a new request from the HTTP server
    and creates a CGI-compatible execution environment for the request.

    If the application was invoked as a CGI program, the first
    call to FCGI_Accept is essentially a no-op and the second
    call returns -1.  This causes a correctly coded FastCGI Responder
    application to run a single request and exit, giving CGI
    behavior.

    If the application was invoked as a FastCGI server, the first
    call to FCGI_Accept indicates that the application has completed
    its initialization and is ready to accept its first request.
    Subsequent calls to FCGI_Accept indicate that the application has
    completed processing its current request and is ready to accept a
    new request.  An application can complete the current request
    without accepting a new one by calling FCGI_Finish(3); later, when
    ready to accept a new request, the application calls FCGI_Accept.

    In completing the current request, FCGI_Accept may detect
    errors, e.g. a broken pipe to a client who has disconnected
    early.  FCGI_Accept ignores such errors.  An application
    that wishes to handle such errors should explicitly call
    fclose(stderr), then fclose(stdout); an EOF return from
    either one indicates an error.

    If the environment variable FCGI_WEB_SERVER_ADDRS is set when
    FCGI_Accept is called, it should contain a comma-separated list
    of IP addresses.  Each IP address is written as four decimal
    numbers in the range [0..255] separated by decimal points.
    (nslookup(8) translates the more familiar symbolic IP hostname
    into this form.)  So one legal binding for this variable is

        FCGI_WEB_SERVER_ADDRS=199.170.183.28,199.170.183.71

    FCGI_Accept checks the peer IP address of each new connection for
    membership in the list.  If the check fails (including the
    possibility that the connection didn't use TCP/IP transport),
    FCGI_Accept closes the connection and accepts another one
    (without returning in between).

    After accepting a new request, FCGI_Accept assigns new values
    to the global variables stdin, stdout, stderr, and environ.
    After FCGI_Accept returns, these variables have the same
    interpretation as on entry to a CGI program.

    FCGI_Accept frees any storage allocated by the previous call
    to FCGI_Accept.  This has important consequences:

        DO NOT retain pointers to the environ array or any strings
        contained in it (e.g. to the result of calling getenv(3)),
        since these will be freed by the next call to FCGI_Finish or
        FCGI_Accept.

        DO NOT use setenv(3) or putenv(3) to modify the environ array
        created by FCGI_Accept, since this will either leak storage
        or cause the next call to FCGI_Finish or FCGI_Accept to free
        storage that should not be freed.

        If your application needs to use setenv or putenv to modify
        the environ array, it should follow this coding pattern:

            char **savedEnviron, **requestEnviron;
            int acceptStatus;

            savedEnviron = environ;
            acceptStatus = FCGI_Accept();
            requestEnviron = environ;
            environ = savedEnviron;
            if(acceptStatus >= 0 && !FCGX_IsCGI()) {
                /*
                 * requestEnviron points to name-value pairs in
                 * storage allocated by FCGI_Accept.  OK to read,
                 * not OK to retain pointers -- make copies instead.
                 */
            }
            /*
             * OK to do setenv or putenv, but beware of storage leaks!
             */

    In addition to the standard CGI environment variables, the
    environment variable FCGI_ROLE is always set to the role
    of the current request.  The roles currently defined are
    RESPONDER, AUTHORIZER, and FILTER.

    In the FILTER role, the additional variables FCGI_DATA_LENGTH
    and FCGI_DATA_LAST_MOD are also defined.  See the manpage
    FCGI_StartFilterData(3) for complete information.

    The macros FCGI_ToFILE and FCGI_ToFcgiStream are provided
    to allow escape to native functions that use the types FILE or
    FCGI_Stream.  In the case of FILE, functions would have to
    be separately compiled, since fcgi_stdio.h replaces the standard
    FILE with FCGI_FILE.

     RETURN VALUES
    0 for successful call, -1 for error (application should exit).

SEE ALSO
    FCGI_Finish(3)
    FCGI_StartFilterData(3)
    FCGI_SetExitStatus(3)
    cgi-fcgi(1)
    nslookup(8)

HISTORY
    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: FCGI_Accept.3,v 1.1.1.1 1997/09/16 15:36:25 stanleyg Exp $

Referenced By

FCGI_Finish(3), FCGI_SetExitStatus(3), FCGI_StartFilterData(3).