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#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#if EMSCRIPTEN
#include <emscripten.h>
#endif
#include "test_sockets_msg.h"
typedef enum {
MSG_READ,
MSG_WRITE
} msg_state_t;
typedef struct {
int fd;
} server_t;
typedef struct {
int fd;
struct sockaddr_in addr;
msg_t msg;
msg_state_t state;
int read;
int wrote;
} client_t;
server_t server;
client_t client;
void cleanup() {
if (server.fd) close(server.fd);
if (client.fd) close(client.fd);
}
void main_loop(void *arg) {
int res;
fd_set fdr;
fd_set fdw;
// see if there are any connections to accept or read / write from
FD_ZERO(&fdr);
FD_ZERO(&fdw);
FD_SET(server.fd, &fdr);
FD_SET(server.fd, &fdw);
#if !USE_UDP
if (client.fd) FD_SET(client.fd, &fdr);
if (client.fd) FD_SET(client.fd, &fdw);
#endif
res = select(64, &fdr, &fdw, NULL, NULL);
if (res == -1) {
perror("select failed");
exit(EXIT_SUCCESS);
}
#if !USE_UDP
// for TCP sockets, we may need to accept a connection
if (FD_ISSET(server.fd, &fdr)) {
client.fd = accept(server.fd, NULL, NULL);
assert(client.fd != -1);
}
#endif
#if !USE_UDP
int fd = client.fd;
#else
int fd = server.fd;
#endif
if (client.state == MSG_READ) {
socklen_t addrlen;
if (!FD_ISSET(fd, &fdr)) {
return;
}
res = do_msg_read(fd, &client.msg, client.read, 0, (struct sockaddr *)&client.addr, &addrlen);
if (res != -1) client.read += res;
// once we've read the entire message, echo it back
if (client.read >= client.msg.length) {
client.read = 0;
client.state = MSG_WRITE;
}
} else {
if (!FD_ISSET(fd, &fdw)) {
return;
}
res = do_msg_write(fd, &client.msg, client.wrote, 0, (struct sockaddr *)&client.addr, sizeof(client.addr));
if (res != -1) client.wrote += res;
// close the client once we've echo'd back the entire message
if (client.wrote >= client.msg.length) {
close(client.fd);
memset(&client, 0, sizeof(client_t));
}
}
}
int main() {
struct sockaddr_in addr;
int res;
atexit(cleanup);
//signal(SIGTERM, cleanup);
memset(&server, 0, sizeof(server_t));
memset(&client, 0, sizeof(client_t));
// create the socket and set to non-blocking
#if !USE_UDP
server.fd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
#else
server.fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
#endif
if (server.fd == -1) {
perror("cannot create socket");
exit(EXIT_FAILURE);
}
fcntl(server.fd, F_SETFL, O_NONBLOCK);
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(SOCKK);
if (inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr) != 1) {
perror("inet_pton failed");
exit(EXIT_FAILURE);
}
res = bind(server.fd, (struct sockaddr *)&addr, sizeof(addr));
if (res == -1) {
perror("bind failed");
exit(EXIT_FAILURE);
}
#if !USE_UDP
res = listen(server.fd, 50);
if (res == -1) {
perror("listen failed");
exit(EXIT_FAILURE);
}
#endif
#if EMSCRIPTEN
emscripten_set_main_loop(main_loop, 60, 0);
#else
while (1) main_loop(NULL);
#endif
return EXIT_SUCCESS;
}
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