单个 C 文件实现的 Web 服务器

　2012-11-19 13:15:04　来源：WEB开发网　　　

核心提示：") == 0) {php_cgi(resource, fd);sleep(1);close(fd);exit(1);} else {printf("200 OK, Content-Type: %s\n\n",extensions[i].mediatype);send_new(fd, &q

") == 0) {
php_cgi(resource, fd);
sleep(1);
close(fd);
exit(1);
} else {
printf("200 OK, Content-Type: %s\n\n",
extensions[i].mediatype);
send_new(fd, "HTTP/1.1 200 OK\r\n");
send_new(fd, "Server : Web Server in C\r\n\r\n");
if (ptr == request + 4) // if it is a GET request
{
if ((length = get_file_size(fd1)) == -1)
printf("Error in getting size !\n");
size_t total_bytes_sent = 0;
ssize_t bytes_sent;
while (total_bytes_sent < length) {
//Zero copy optimization
if ((bytes_sent = sendfile(fd, fd1, 0,
length - total_bytes_sent)) <= 0) {
if (errno == EINTR || errno == EAGAIN) {
continue;
}
perror("sendfile");
return -1;
}
total_bytes_sent += bytes_sent;
}

}
}
break;
}
int size = sizeof(extensions) / sizeof(extensions[0]);
if (i == size - 2) {
printf("415 Unsupported Media Type\n");
send_new(fd, "HTTP/1.1 415 Unsupported Media Type\r\n");
send_new(fd, "Server : Web Server in C\r\n\r\n");
send_new(fd, "<html><head><title>415 Unsupported Media Type</head></title>");
send_new(fd, "<body><p>415 Unsupported Media Type!</p></body></html>");
}
}

close(fd);
}
}
shutdown(fd, SHUT_RDWR);
}

int main(int argc, char *argv[]) {
int sockfd, newsockfd, portno, pid;
socklen_t clilen;
struct sockaddr_in serv_addr, cli_addr;

if (argc < 2) {
fprintf(stderr, "ERROR, no port provided\n");
exit(1);
}
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
bzero((char *) &serv_addr, sizeof(serv_addr));
portno = atoi(argv[1]);
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
error("ERROR on binding");
listen(sockfd, 5);
clilen = sizeof(cli_addr);
/*
Server runs forever, forking off a separate
process for each connection.
*/
while (1) {
newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
if (newsockfd < 0)
error("ERROR on accept");
pid = fork();
if (pid < 0)
error("ERROR on fork");
if (pid == 0) {
close(sockfd);
connection(newsockfd);
exit(0);
} else
close(newsockfd);
} /* end of while */
close(sockfd);
return 0; /* we never get here */
}