在Linux服务器上运行一个C程序 [英] Run a C Program on a Linux Server
问题描述
这个问题，我敢肯定，已回答了，我真的不知道该如何通过搜索要求它虽然。所以，请原谅我缺乏知识作为唯一的地方，我真的有计算机科学的世界缺乏知识的这一个。
This question I'm sure has been answered, I honestly don't know how to ask it via search though. So please excuse my lack of knowledge as this one of the only place I really have a lack of knowledge in the world of Computer Science.
如何用I /是否有可能，运行托管服务器上的C程序。到了那里我可以去 http://mysite.com/myspecialcprogram.c ，它会跑？或者更好的，到什么程度，我可以使用像C一种高级语言，为我的服务器程序？
How can I/ Is it possible, to run a C program on a Hosted Server. To where I could go to http://mysite.com/myspecialcprogram.c and it would run? Or better yet, to what extent can I use a high level language like C to program for my server?
还应该指出的是，我有一个专门的Linux机器上运行的Apache。所以，我有充分的机会。
It should also be noted that I have a Dedicated Linux box running apache. So I have full access.
推荐答案
一种方法是运行它的CGI，因为@paddy已经提到。但是，程序会运行缓慢，长期的启动时间。
One way is to run it as CGI, as @paddy already mentioned. However, the program will run slow, long startup time.
另一种方法是使用运行它的FastCGI 。这将更加快捷，你只需要在你的code进行一些修改，使之工作，例如CGI：
Another way is to run it using FastCGI. It will be much more faster, you just need a few modifications on your code to make it works, for example as CGI:
#include <stdio.h>
#include <time.h>
int main(int argc, char **argv)
{
time_t timer;
char time_str[25];
struct tm* tm_info;
time(&timer);
tm_info = localtime(&timer);
strftime(time_str, sizeof(time_str), "%Y/%m/%d %H:%M:%S", tm_info);
/* Without this line, you will get 500 error */
puts("Content-type: text/html\n");
puts("<!DOCTYPE html>");
puts("<head>");
puts(" <meta charset=\"utf-8\">");
puts("</head>");
puts("<body>");
puts(" <h3>Hello world!</h3>");
printf(" <p>%s</p>\n", time_str);
puts("</body>");
puts("</html>");
return 0;
}
编译：
$ # 'cgi-bin' path may be different than yours
$ sudo gcc example.c -o /usr/lib/cgi-bin/example
$ wget -q -O - http://localhost/cgi-bin/example
<!DOCTYPE html>
<head>
<meta charset="utf-8">
</head>
<body>
<h3>Hello world!</h3>
<p>2013/01/30 08:07:29</p>
</body>
</html>
$
使用FastCGI：
Using FastCGI:
#include <fcgi_stdio.h>
#include <stdio.h>
#include <time.h>
int main(int argc, char **argv)
{
time_t timer;
char time_str[25];
struct tm* tm_info;
while(FCGI_Accept() >= 0) {
time(&timer);
tm_info = localtime(&timer);
strftime(time_str, sizeof(time_str), "%Y/%m/%d %H:%M:%S", tm_info);
/* Without this line, you will get 500 error */
puts("Content-type: text/html\n");
puts("<!DOCTYPE html>");
puts("<head>");
puts(" <meta charset=\"utf-8\">");
puts("</head>");
puts("<body>");
puts(" <h3>Hello world!</h3>");
printf(" <p>%s</p>\n", time_str);
puts("</body>");
puts("</html>");
}
return 0;
}
编译：
$ # Install the development fastcgi package, I'm running Debian
$ sudo apt-get install libfcgi-dev
...
$
$ # Install Apache mod_fcgid (not mod_fastcgi)
$ sudo apt-get install libapache2-mod-fcgid
...
$
$ # Compile the fastcgi version with .fcgi extension
$ sudo gcc example.c -lfcgi -o /usr/lib/cgi-bin/example.fcgi
$ # Restart Apache
$ sudo /etc/init.d/apache2 restart
Restarting web server: apache2 ... waiting .
$
$ # You will notice how fast it is
$ wget -q -O - http://localhost/cgi-bin/example.fcgi
<!DOCTYPE html>
<head>
<meta charset="utf-8">
</head>
<body>
<h3>Hello world!</h3>
<p>2013/01/30 08:15:23</p>
</body>
</html>
$
$ # Our fastcgi script process
$ ps aux | grep \.fcgi
www-data 2552 0.0 0.1 1900 668 ? S 08:15 0:00 /usr/lib/cgi-bin/example.fcgi
$
在poth programes，有：
In poth programes, there is:
puts("Content-type: text/html\n");
这会打印：
Content-type: text/html[new line]
[new line]
如果没有它Apache将抛出500内部服务器错误。
Without it Apache will throw 500 server internal error.
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