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Hello, World is the standard first C program. It usually looks
like this:
#include <stdio.h>
int main(int argc, char *argv)
{ printf("Hello, World\n");
}
However, a cgi-bin program (that is, a program run by a web server
in response to a request) needs to output some header information and
html code. We do this here.
In a file called ``hello.c'' we put the following code:
#include <stdio.h>
int main(int argc, char *argv)
{
char *result="<HTML><HEAD></HEAD><BODY>Hello, World\n</BODY></HTML>\n";
printf("Content-type: text/html\n");
printf("Content-Length: %d\n",strlen(result));
printf("\n");
printf("%s",result);
return(0);
}
Next, we compile this code:
gcc -o hello hello.c
Since the compiled code doesn't depend on anything we can just run it
and look at the result:
Content-type: text/html
Content-Length: 53
<HTML><HEAD></HEAD><BODY>Hello, World
</BODY></HTML>
Since it outputs valid html we copy it to the cgi-bin directory:
cp hello /var/www/cgi-bin
and then we ask for the code by going to a web browser (or using
telnet) at the url:
http://127.0.0.1/cgi-bin/hello
root
2004-02-18