C 语言 CGI 访问计数器

用 C 语言写的简单的 CGI 访问计数器程序，用文件保存的计数，我觉得比数据库高效一点吧，呵呵。

/* counter.c
 * Heihaier 
 */

#include 
#include 

int main(int argc, char * argv[])
{
	unsigned long long int counter = 0;
	FILE * f = NULL;
	char file[256];

	printf("Content-type: text/html;\n\n");

	char * query = getenv("QUERY_STRING");
	if(NULL == query)
	  goto error;

	snprintf(file, 256, "./data/%s", query);

	f = fopen(file, "rw+");
	if(NULL == f)
	  goto error;

	fread(&counter, sizeof(unsigned long long int), 1, f);

	printf("document.write(\"%llu\");", ++counter);

	fseek(f, 0, SEEK_SET);
	fwrite(&counter, sizeof(unsigned long long int), 1, f);

	fclose(f);

	return 0;
error:
	return -1;
}

gcc counter.c -o /var/web/cgi-bin/counter.cgi
mkdir /var/web/cgi-bin/data
touch /var/web/cgi-bin/data/www.heiher.info
chmod 666 /var/web/cgi-bin/data/www.heiher.info

Over!