#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <nanomsg/nn.h>
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#include <nanomsg/pair.h>
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#define NODE0 "node0"
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#define NODE1 "node1"
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void
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fatal(const char *func)
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{
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fprintf(stderr, "%s: %s\n", func, nn_strerror(nn_errno()));
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exit(1);
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}
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int
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send_name(int sock, const char *name)
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{
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printf("%s: SENDING \"%s\"\n", name, name);
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int sz_n = strlen(name) + 1; // '\0' too
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return (nn_send(sock, name, sz_n, 0));
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}
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int
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recv_name(int sock, const char *name)
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{
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char *buf = NULL;
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int result = nn_recv(sock, &buf, NN_MSG, 0);
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if (result > 0) {
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printf("%s: RECEIVED \"%s\"\n", name, buf);
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nn_freemsg(buf);
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}
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return (result);
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}
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int
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send_recv(int sock, const char *name)
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{
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int to = 100;
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if (nn_setsockopt(sock, NN_SOL_SOCKET, NN_RCVTIMEO, &to, sizeof (to)) < 0) {
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fatal("nn_setsockopt");
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}
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for (;;) {
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recv_name(sock, name);
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sleep(1);
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send_name(sock, name);
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}
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}
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int
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node0(const char *url)
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{
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int sock;
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if ((sock = nn_socket(AF_SP, NN_PAIR)) < 0) {
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fatal("nn_socket");
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}
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if (nn_bind(sock, url) < 0) {
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fatal("nn_bind");
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}
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return (send_recv(sock, NODE0));
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}
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int
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node1(const char *url)
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{
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int sock;
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if ((sock = nn_socket(AF_SP, NN_PAIR)) < 0) {
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fatal("nn_socket");
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}
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if (nn_connect(sock, url) < 0) {
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fatal("nn_connect");
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}
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return (send_recv(sock, NODE1));
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}
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int
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main(const int argc, const char **argv)
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{
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if ((argc > 1) && (strcmp(NODE0, argv[1]) == 0))
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return (node0(argv[2]));
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if ((argc > 1) && (strcmp(NODE1, argv[1]) == 0))
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return (node1(argv[2]));
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fprintf(stderr, "Usage: pair %s|%s <URL> <ARG> ...\n", NODE0, NODE1);
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return 1;
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}
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/**
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Compilation
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gcc pair.c -lnanomsg -o pair
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Execution
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./pair node0 ipc:///tmp/pair.ipc & node0=$!
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./pair node1 ipc:///tmp/pair.ipc & node1=$!
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sleep 3
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kill $node0 $node1
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*/
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