携梦远行

FastCGI 学习第二步就看看example下的echo.c吧 看看到底是一个什么东西。

源码：

#ifndef lint
static const char rcsid[] = "$Id: echo.c,v 1.5 1999/07/28 00:29:37 roberts Exp $";
#endif /* not lint */

#include "fcgi_config.h"

#include <stdlib.h>

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef _WIN32
#include <process.h>
#else
extern char **environ;
#endif

#include "fcgi_stdio.h"

static void PrintEnv(char *label, char **envp)
{
    printf("%s:<br>\n<pre>\n", label);
    for ( ; *envp != NULL; envp++) {
        printf("%s\n", *envp);
    }
    printf("</pre><p>\n");
}

int main ()
{
    char **initialEnv = environ;
    int count = 0;

    while (FCGI_Accept() >= 0) { //判断是否有请求产生
        char *contentLength = getenv("CONTENT_LENGTH");
        int len;

	printf("Content-type: text/html\r\n"
	    "\r\n"
	    "<title>FastCGI echo</title>"
	    "<h1>FastCGI echo</h1>\n"
            "Request number %d,  Process ID: %d<p>\n", ++count, getpid());

        if (contentLength != NULL) {
            len = strtol(contentLength, NULL, 10);
        }
        else {
            len = 0;
        }

        if (len <= 0) {
	    printf("No data from standard input.<p>\n");
        }
        else {
            int i, ch;

	    printf("Standard input:<br>\n<pre>\n");
            for (i = 0; i < len; i++) {
                if ((ch = getchar()) < 0) {
                    printf("Error: Not enough bytes received on standard input<p>\n");
                    break;
		}
                putchar(ch);
            }
            printf("\n</pre><p>\n");
        }

        PrintEnv("Request environment", environ);
        PrintEnv("Initial environment", initialEnv);
    } /* while */

    return 0;
}

这个demo很简单 核心代码 FCGI_Accept() 判断是否有请求产生 接下的就是写简单的业务逻辑。