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// TCP client that operates TCP connection in two threads: one thread that does blocking recv(),
// and another that does send()s
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netdb.h>
#ifdef __EMSCRIPTEN__
#include <emscripten.h>
#include <emscripten/websocket.h>
#include <emscripten/threading.h>
EMSCRIPTEN_WEBSOCKET_T bridgeSocket = 0;
extern "C" {
EMSCRIPTEN_WEBSOCKET_T emscripten_init_websocket_to_posix_socket_bridge(const char *bridgeUrl);
}
#endif
int lookup_host(const char *host)
{
struct addrinfo hints, *res;
int errcode;
char addrstr[100];
void *ptr;
memset(&hints, 0, sizeof (hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags |= AI_CANONNAME;
errcode = getaddrinfo(host, NULL, &hints, &res);
if (errcode != 0)
{
printf("getaddrinfo failed!\n");
return -1;
}
printf("Host: %s\n", host);
while (res)
{
inet_ntop(res->ai_family, res->ai_addr->sa_data, addrstr, 100);
switch (res->ai_family)
{
case AF_INET:
ptr = &((struct sockaddr_in *)res->ai_addr)->sin_addr;
break;
case AF_INET6:
ptr = &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr;
break;
}
inet_ntop(res->ai_family, ptr, addrstr, 100);
printf("IPv%d address: %s (%s)\n", res->ai_family == PF_INET6 ? 6 : 4, addrstr, res->ai_canonname);
res = res->ai_next;
}
return 0;
}
_Atomic uint32_t pendingMessages = 0;
void *send_thread(void *arg)
{
int sock = (int)(intptr_t)arg;
for(int i = 0; i < 10; ++i)
{
char message[] = "hella";
message[4] += i;
while(pendingMessages != 0)
emscripten_thread_sleep(10);
printf("Send()ing\n");
if (send(sock, message, strlen(message), 0) < 0)
{
puts("Send failed");
pthread_exit((void*)1);
}
printf("Send() done\n");
pendingMessages++;
}
pthread_exit(0);
}
void *recv_thread(void *arg)
{
int sock = (int)(intptr_t)arg;
for(int i = 0; i < 10; ++i)
{
char server_reply[256] = {};
printf("Recv()ing\n");
if (recv(sock, server_reply, 256, 0) < 0)
{
puts("recv failed");
pthread_exit((void*)1);
}
printf("Recv() done\n");
puts("Server reply: ");
puts(server_reply);
pendingMessages--;
}
pthread_exit(0);
}
int main(int argc , char *argv[])
{
#ifdef __EMSCRIPTEN__
bridgeSocket = emscripten_init_websocket_to_posix_socket_bridge("ws://localhost:8080");
// Synchronously wait until connection has been established.
uint16_t readyState = 0;
do {
emscripten_websocket_get_ready_state(bridgeSocket, &readyState);
emscripten_thread_sleep(100);
} while(readyState == 0);
#endif
lookup_host("google.com");
// Create socket
int sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock == -1)
{
printf("Could not create socket");
exit(1);
}
printf("Socket created: %d\n", sock);
struct sockaddr_in server;
server.sin_addr.s_addr = inet_addr("127.0.0.1");
server.sin_family = AF_INET;
server.sin_port = htons(8888);
if (connect(sock, (struct sockaddr *)&server, sizeof(server)) < 0)
{
perror("connect failed. Error");
return 1;
}
pthread_t sendThread;
pthread_t recvThread;
pthread_create(&recvThread, 0, &recv_thread, (void*)sock);
emscripten_thread_sleep(1000); // To get a better guarantee that the first recv() precedes the first send(), sleep for a moment between recv+send thread starts
pthread_create(&sendThread, 0, &send_thread, (void*)sock);
void *sendRet;
void *recvRet;
printf("Waiting for send thread to be finished\n");
pthread_join(sendThread, &sendRet);
printf("Send thread finished, waiting for recv thread to be finished\n");
pthread_join(recvThread, &recvRet);
printf("Send thread and recv thread finished\n");
close(sock);
if ((long)sendRet != 0) fprintf(stderr, "pthread send failed!\n");
if ((long)recvRet != 0) fprintf(stderr, "pthread recv failed!\n");
return 0;
}
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