Un modello integrato control-flow e data-flow per il rilevamento ...

32 3. Un modello che integra control flow e data flow
1 #include
2 #define CONFIG "/etc/simpleserver.conf"
3 #define BUFSZ 1024
4
5 read_file(char *name, char *buf) {
6 fd = open(name, O_RDONLY);
7 read(fd, buf);
8 close(fd);
9 }
10
11 write_file(char *name, char *buf) {
12 fd = open(name, O_WRONLY);
13 write(fd, buf, len);
14 close(fd);
15 }
16
17 server_loop(struct config *cfg)
18 {
19 while (1) {
20 fd = accept_client();
21 read_req(fd, req);
22
23 if (req->method == GET) {
24 read_file(req->file, tmpbuf);
25 send(fd, tmpbuf);
26 }
27 else if (req->method == PUT) {
28 recv(fd, tmpbuf);
29 write_file(req->file, tmpbuf);
30 break;
31 }
32 }
33 }
34
35 main(void)
36 {
37 read_file(CONFIG, configbuf);
38 cfg = parse_config(configbuf);
39 if(cfg->admin_wants_chroot)
40 chroot(cfg->chroot_jail);
41
42 server_loop(cfg);
43 }
Figura 3.5: Programma per il secondo esempio.