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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN"><HTML> <HEAD> <TITLE> FCGI_Accept(2) Man Page </TITLE><STYLE TYPE="text/css"> body { background-color: #ffffff; } li.c2 {list-style: none} div.c1 {text-align: center}</STYLE> </HEAD> <BODY> <A HREF="cover.htm">[Top]</A> <A HREF="ch4tcl.htm">[Prev]</A> <A HREF="ap_guida.htm">[Next]</A> <A HREF= "ap_guida.htm">[Bottom]</A> <HR> <BR> <A NAME="3601"></A> <DIV CLASS="c1"> <H1> A FastCGI<BR> Reference Pages </H1> </DIV> <A NAME="95882"></A> <P> This appendix contains reference pages for the following FastCGI routines from the <CODE>fcgi_stdio</CODE> library: </P> <BR> <BR> <UL> <LI CLASS="c2"> <A NAME="95884"></A> </LI> <LI> <CODE>FCGI_Accept</CODE> <A NAME="95885"></A> </LI> <LI> <CODE>FCGI_Start_Filter_Data</CODE> <A NAME="95859"></A> </LI> <LI> <CODE>FCGI_SetExitStatus</CODE> </LI> </UL> <H1> FCGI_Accept (3) </H1> <H2> Name </H2> <A NAME="95637"></A> <CODE>FCGI_Accept, FCGI_ToFILE, FCGI_ToFcgiStream</CODE> <P> - fcgi_stdio compatibility library </P> <BR> <BR> <H2> Synopsis </H2><PRE><A NAME="95669">#include <fcgi_stdio.h></A><A NAME="95653">int<BR> FCGI_Accept(void);</A><A NAME="95654">FILE *<BR> FCGI_ToFILE(FCGI_FILE *);</A><A NAME="95655">FCGI_Stream *<BR> FCGI_ToFcgiStream(FCGI_FILE *);</A></PRE> <H2> Description </H2> <A NAME="95683"></A> <P> The FCGI_Accept function accepts a new request from the HTTP server and creates a CGI-compatible execution environment for the request. </P> <P> <A NAME="95657"></A> 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 application to run a single request and exit, giving CGI behavior. </P> <P> <A NAME="95658"></A> 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. </P> <P> <A NAME="95659"></A> In completing the current request, FCGI_Accept may detect errors, such as 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. </P> <P> <A NAME="95660"></A> 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. </P> <P> <A NAME="95661"></A> In addition to the standard CGI environment variables, the environment variable <CODE>FCGI_ROLE</CODE> is always set to the role of the current request. The roles currently defined are <CODE>RESPONDER, AUTHORIZER</CODE>, and <CODE>FILTER</CODE>. </P> <P> <A NAME="95662"></A> In the <CODE>FILTER</CODE> role, the additional variables <CODE>FCGI_DATA_LENGTH</CODE> and <CODE>FCGI_DATA_LAST_MOD</CODE> are also defined. See <CODE>FCGI_StartFilterData</CODE><CODE>(3</CODE>) for complete information. </P> <P> <A NAME="95663"></A> The macros <CODE>FCGI_ToFILE</CODE> and <CODE>FCGI_ToFcgiStream</CODE> are provided to allow escape to native functions that use the types <CODE>FILE</CODE> or <CODE>FCGI_Stream</CODE>. In the case of <CODE>FILE</CODE>, functions would have to be separately compiled, since <CODE>fcgi_stdio.h</CODE> replaces the standard <CODE>FILE</CODE> with <CODE>FCGI_FILE</CODE>. </P> <BR> <BR> <H2> Return Values </H2> <A NAME="95686"></A> <P> 0 for successful call, -1 for error (application should exit). </P> <BR> <BR> <H1> FCGI_StartFilterData (3) </H1> <H2> Name </H2> <A NAME="95311"></A> <CODE>FCGI_StartFilterData</CODE> <P> -<CODE>fcgi_stdio</CODE> compatibility library </P> <BR> <BR> <H2> Synopsis </H2><PRE><A NAME="95313">#include <fcgi_stdio.h></A><A NAME="95314">int FCGI_StartFilterData(void)</A></PRE> <H2> Description </H2> <A NAME="95728"></A> <P> Enables a FastCGI Filter application to begin reading its filter input data from <CODE>stdin</CODE>. </P> <P> <A NAME="95729"></A> In order to call <CODE>FCGI_StartFilterData</CODE>, the FastCGI application should have been invoked in the filter role (<CODE>getenv("FCGI_ROLE") == "FILTER"</CODE>), and should have read <CODE>stdin</CODE> to EOF, consuming the entire <CODE>FCGI_STDIN</CODE> data stream. The call to <CODE>FCGI_StartFilterData</CODE> positions stdin at the start of <CODE>FCGI_DATA</CODE>. </P> <P> <A NAME="95730"></A> If the preconditions are not met (e.g., the application has not read <CODE>stdin</CODE> to EOF), <CODE>FCGI_StartFilterData</CODE> returns a negative result, and the application will get EOF on attempts to read from <CODE>stdin</CODE>. </P> <P> <A NAME="95731"></A> The application can determine the number of bytes available on <CODE>FCGI_DATA</CODE> by performing <CODE>atoi(getenv("FCGI_DATA_LENGTH")</CODE>. If fewer than this many bytes are delivered on <CODE>stdin</CODE> after calling <CODE>FCGI_StartFilterData</CODE>, the application should perform an application-specific error response. If the application normally makes an update, most likely it should abort the update. </P> <P> <A NAME="95732"></A> The application can determine last modification time of the filter input data by performing <CODE>getenv("FCGI_DATA_LAST_MOD").</CODE> This allows applications to perform caching based on last modification time. </P> <BR> <BR> <H2> Return Values </H2> <A NAME="95322"></A> <P> Returns 0 on success and a negative integer on failure. </P> <BR> <BR> <H2> Example </H2> <A NAME="95363"></A> <P> The following example reads in all the client data, but ignores it. Then, the code calls <CODE>FCGI_StartFilterData</CODE>. Finally, the code reads in the file to be filtered and simply echos it back to the client. </P> <BR> <BR><PRE><A NAME="95324">while (FCGI_Accept() >= 0) {</A><A NAME="95325">...</A> <A NAME="95364">/* Read data passed by client. */</A> <A NAME="95358"> while (getchar () != OF) </A><A NAME="95935">{</A><A NAME="95930">}</A><A NAME="95359"></A> <A NAME="95367">/* Adjust standard input stream. */</A> <A NAME="95366"> status = FCGI_StartFilterData();</A><A NAME="95369"></A> <A NAME="95360">/* Read in filter data and echo it back to client. */</A> <A NAME="95368"> while ((len = fread(tempBuffer, 1, 1024, stdin)) > 0) </A> <A NAME="95361"> fwrite(tempBuffer, 1, len, stdout);</A><A NAME="95844"></A><A NAME="95845">} /* End FCGI_Accept loop */</A></PRE> <H1> FCGI_SetExitStatus(3) </H1> <H2> Name </H2> <A NAME="95794"></A> <CODE>FCGI_SetExitStatus</CODE> <P> - <CODE>fcgi_stdio</CODE> compatibility library </P> <BR> <BR> <H2> Synopsis </H2><PRE><A NAME="95795">#include <fcgi_stdio.h></A><A NAME="95787">void FCGI_SetExitStatus(int status);</A></PRE> <H2> Description </H2> <A NAME="95796"></A> <P> Sets the exit status for the current FastCGI request. The exit status is the status code the request would have exited with, had the request been run as a CGI program. </P> <P> <A NAME="95789"></A> You can call <CODE>FCGI_SetExitStatus</CODE> several times during a request; the last call before the request ends determines the value. </P> <P> <A NAME="95797"></A> </P> <P> </P> <HR> <BR> <A HREF="cover.htm">[Top]</A> <A HREF="ch4tcl.htm">[Prev]</A> <A HREF="ap_guida.htm">[Next]</A> <A HREF= "ap_guida.htm">[Bottom]</A> <HR> <BR> <!-- This file was created with Quadralay WebWorks Publisher 3.0.3 --> <!-- --> <!-- For more information on how this document, and how the rest of --> <!-- this server was created, email yourEmail@xyzcorp.com --> <!-- --> <!-- Last updated: 04/15/96 08:00:20 --> </BODY></HTML>⌨️ 快捷键说明
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