1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
| #include "bipc.h"
|
| #define SERVER "server"
| #define CLIENT "client"
| #define DATE "DATE"
|
|
|
| void
| fatal(const char *func, int rv)
| {
| fprintf(stderr, "%s: %s\n", func, bipc_strerror(rv));
| exit(1);
| }
|
| char *
| date(void)
| {
| time_t now = time(&now);
| struct tm *info = localtime(&now);
| char *text = asctime(info);
| text[strlen(text)-1] = '\0'; // remove '\n'
| return (text);
| }
|
| int
| server(const char *url)
| {
| bipc_socket_t sock;
| int rv;
|
|
| if ((rv = bipc_listen(&sock, url, SURVEY)) != 0) {
| fatal("nng_listen", rv);
| }
| for (;;) {
| printf("SERVER: SENDING DATE SURVEY REQUEST\n");
| if ((rv = bipc_send(&sock, DATE, strlen(DATE) + 1)) != 0) {
| fatal("nng_send", rv);
| }
|
| for (;;) {
| char *buf = NULL;
| size_t sz;
| rv = bipc_recv(&sock, &buf, &sz);
| if (rv == BIPC_ETIMEDOUT) {
| break;
| }
| if (rv != 0) {
| fatal("nng_recv", rv);
| }
| printf("SERVER: RECEIVED \"%s\" SURVEY RESPONSE\n", buf);
| bipc_free(buf, sz);
| }
|
| printf("SERVER: SURVEY COMPLETE\n");
| }
| }
|
| int
| client(const char *url, const char *name)
| {
| bipc_socket_t sock;
| int rv;
|
| if ((rv = bipc_connect(&sock, url, SURVEY)) != 0) {
| fatal("nng_dial", rv);
| }
| for (;;) {
| char *buf = NULL;
| size_t sz;
| if ((rv = bipc_recv(&sock, &buf, &sz)) == 0) {
| printf("CLIENT (%s): RECEIVED \"%s\" SURVEY REQUEST, length=%d\n", name, buf, sz);
| bipc_free(buf, sz);
| char *d = date();
| printf("CLIENT (%s): SENDING DATE SURVEY RESPONSE\n", name);
| if ((rv = bipc_send(&sock, d, strlen(d) + 1)) != 0) {
| fatal("nng_send", rv);
| }
| }
| }
| }
|
| int
| main(const int argc, const char **argv)
| {
| if ((argc >= 2) && (strcmp(SERVER, argv[1]) == 0))
| return (server(argv[2]));
|
| if ((argc >= 3) && (strcmp(CLIENT, argv[1]) == 0))
| return (client(argv[2], argv[3]));
|
| fprintf(stderr, "Usage: survey %s|%s <URL> <ARG> ...\n",
| SERVER, CLIENT);
| return 1;
| }
|
|
