C로 작성한 필터 응용 프로그램(SimpleFilter.c)

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcgi_stdio.h>

		void main(void) {
			size_t PageSize = 1024 * 3;
    		char *page;
    		FCGX_Stream *in, *out, *err;
    		FCGX_ParamArray envp;

		 	int count=0;
    		page = (char *)malloc(PageSize);

		 	if (page == NULL) {

				printf("Content-type: text/x-server-parsed-html\r\n");
				printf("<title>malloc failure</title>");
				printf("<h1>Cannot allocate memory to run filter. exiting</h1>");
				printf("\r\n\r\n");
				exit(2);
			}

			while(FCGI_Accept() >= 0) {

         	char *tmp;
         	char *execcgi;      
         	char *dataLenStr = NULL;
         	int numchars = 0;
         	int stdinDataSize = 0;
         	int filterDataLen = 0;
         	int dataToBeRead = 0;
         	int x = 0;
         	int loopCount = 0;   
				

			  	count++;
         	dataLenStr = getenv("FCGI_DATA_LENGTH");
        
         	if(dataLenStr)
             	filterDataLen = atoi(dataLenStr);
   
				/* clear out stdin */
         	while (EOF != getc(stdin)) {
             	stdinDataSize++;
         	}

				dataToBeRead = filterDataLen;
        	FCGI_StartFilterData();
        	tmp = page; /** just in case fread or fwrite moves our pointer **/


				//start responding
				printf("Content-type: text/plain\r\n");
				printf("\r\n"); /** send a new line at the beginning **/
				printf("<title>SIMPLE FILTER</title>");
				printf(<h1>This page was Filtered by SimpleFilter FastCGI filter</h1>");
				printf("file size=%d<br>", filterDatalen);
				printf("stdin size=%d<br>, stdinDataSize);


				while(dataToBeRead > 0 ) {
           		x = 0;
           		page = tmp;
            
           		if(dataToBeRead > PageSize)
             		 x = PageSize;
           		else
              		 x = dataToBeRead;
					numchars = fread((void *)(page), 1, x, stdin);
				
					if( numchars == 0 )
						continue; 
					/** at this point your data is in page pointer, so do 
					whatever you want 
               with it before sending it back to the server.
					In this example, no data is manipulated. Only the count of number of 
               times the filter data is read and the total bytes read 
					at the end of every 
               loop is printed. **/	

					dataToBeRead -= numchars;
					loopCount++;
					printf("loop count = %d ... so far read %d bytes <br>", loopCount, 
					(filterDatalen - dataToBeRead));
				}
				printf("\r\n\r\n"); /** send a new line at the end of transfer **/

				fflush(stdout);

				page = tmp; /** restore page pointer **/
				memset(page,NULL,numchars);
		}

		free(page);
}

위 예에 사용되는 obj.conf 설정의 예.

Web Server를 실행하는 시스템과 같은 시스템에서 이 FastCGI 응용 프로그램을 사용할 수 있는 경우

<Object name=<"filter.fcgi">
						Service fn="filter-fastcgi" app-path="/fastcgi/apps/filter/SimpleFilter.exe" 
             bind-path="localhost:3434" app-env="LD_LIBRARY_PATH=/fastcgi/fcgi-2.4/libfcgi/.libs"
</Object>

응용 프로그램이 원격 시스템에서 실행되는 경우에는 obj.conf 파일에 다음 라인이 포함되어야 합니다.

<Object name="filter.fcgi">
			Service fn="filter-fastcgi" bind-path="<remote-host>:<remote-port>"
</Object>

Web Server 인스턴스의 docroot 디렉토리에 있는 fcgi 디렉토리 아래에 크기가 "26868"바이트인 "FilterThisFile"이 필터링할 파일인 경우 "http://localhost/fcgi/filter/FilterThisFile"에 대한 요청의 출력은 다음과 같습니다.

This page was Filtered by SimpleFilter FastCGI filter