| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include <nanomsg/nn.h> |
| #include <nanomsg/pair.h> |
| |
| #define NODE0 "node0" |
| #define NODE1 "node1" |
| |
| void |
| fatal(const char *func) |
| { |
| fprintf(stderr, "%s: %s\n", func, nn_strerror(nn_errno())); |
| exit(1); |
| } |
| |
| int |
| send_name(int sock, const char *name) |
| { |
| printf("%s: SENDING \"%s\"\n", name, name); |
| int sz_n = strlen(name) + 1; // '\0' too |
| return (nn_send(sock, name, sz_n, 0)); |
| } |
| |
| int |
| recv_name(int sock, const char *name) |
| { |
| char *buf = NULL; |
| int result = nn_recv(sock, &buf, NN_MSG, 0); |
| if (result > 0) { |
| printf("%s: RECEIVED \"%s\"\n", name, buf); // <1> |
| nn_freemsg(buf); |
| } |
| return (result); |
| } |
| |
| int |
| send_recv(int sock, const char *name) |
| { |
| int to = 100; |
| if (nn_setsockopt(sock, NN_SOL_SOCKET, NN_RCVTIMEO, &to, |
| sizeof (to)) < 0) { |
| fatal("nn_setsockopt"); |
| } |
| |
| for (;;) { |
| recv_name(sock, name); |
| sleep(1); |
| send_name(sock, name); |
| } |
| } |
| |
| int |
| node0(const char *url) |
| { |
| int sock; |
| if ((sock = nn_socket(AF_SP, NN_PAIR)) < 0) { |
| fatal("nn_socket"); |
| } |
| if (nn_bind(sock, url) < 0) { |
| fatal("nn_bind"); |
| } |
| return (send_recv(sock, NODE0)); |
| } |
| |
| int |
| node1(const char *url) |
| { |
| int sock; |
| if ((sock = nn_socket(AF_SP, NN_PAIR)) < 0) { |
| fatal("nn_socket"); |
| } |
| if (nn_connect(sock, url) < 0) { |
| fatal("nn_connect"); |
| } |
| return (send_recv(sock, NODE1)); |
| } |
| |
| int |
| main(const int argc, const char **argv) |
| { |
| if ((argc > 1) && (strcmp(NODE0, argv[1]) == 0)) |
| return (node0(argv[2])); |
| |
| if ((argc > 1) && (strcmp(NODE1, argv[1]) == 0)) |
| return (node1(argv[2])); |
| |
| fprintf(stderr, "Usage: pair %s|%s <URL> <ARG> ...\n", NODE0, NODE1); |
| return 1; |
| } |