CGI_example/program.c at master · connlabtw/CGI_example · GitHub

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#include <stdio.h>
#include <unistd.h>
#include <error.h>
#include <stdlib.h>
#include <sys/ioctl.h>

/*
Please make sure you understand host.c
*/

int main(void){
    int unread;
    char *buf;

    // wait for stdin
    while(unread<1){
        if(ioctl(STDIN_FILENO,FIONREAD,&unread)){
            perror("ioctl");
            exit(EXIT_FAILURE);
        }
    }
    buf = (char*)malloc(sizeof(char)*(unread+1));

    // read from stdin fd
    read(STDIN_FILENO,buf,unread);


    // output to stdout
    printf("<HTML><HEAD><meta http-equiv=\"content-type\" content=\"text/html;charset=utf-8\">\n");
    printf("<TITLE>I'm a example</TITLE>\n");
    printf("<BODY>parameter: %s</BODY></HTML>\n",buf);
}