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#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <assert.h>
#if EMSCRIPTEN
#include <emscripten.h>
#endif
#include "test_sockets_msg.h"
// message to send to the server
#ifndef MESSAGE
#define MESSAGE "pingtothepong"
#endif
typedef enum {
MSG_READ,
MSG_WRITE
} msg_state_t;
typedef struct {
int fd;
msg_t msg;
msg_state_t state;
} server_t;
server_t server;
msg_t echo_msg;
int echo_read;
int echo_wrote;
void finish(int result) {
close(server.fd);
#if EMSCRIPTEN
REPORT_RESULT();
#endif
exit(result);
}
void main_loop(void *arg) {
static char out[1024*2];
static int pos = 0;
fd_set fdr;
fd_set fdw;
int res;
// make sure that server.fd is ready to read / write
FD_ZERO(&fdr);
FD_ZERO(&fdw);
FD_SET(server.fd, &fdr);
FD_SET(server.fd, &fdw);
res = select(64, &fdr, &fdw, NULL, NULL);
if (res == -1) {
perror("select failed");
finish(EXIT_FAILURE);
}
if (server.state == MSG_READ) {
if (!FD_ISSET(server.fd, &fdr)) {
return;
}
// as a test, confirm with ioctl that we have data available
// after selecting
int available;
res = ioctl(server.fd, FIONREAD, &available);
assert(res != -1);
assert(available);
res = do_msg_read(server.fd, &server.msg, echo_read, 0, NULL, NULL);
if (res != -1) echo_read += res;
// once we've read the entire message, validate it
if (echo_read >= server.msg.length) {
assert(!strcmp(server.msg.buffer, MESSAGE));
finish(EXIT_SUCCESS);
}
} else {
if (!FD_ISSET(server.fd, &fdw)) {
return;
}
res = do_msg_write(server.fd, &echo_msg, echo_wrote, 0, NULL, 0);
if (res != -1) echo_wrote += res;
// once we're done writing the message, read it back
if (echo_wrote >= echo_msg.length) {
server.state = MSG_READ;
}
}
}
int main() {
struct sockaddr_in addr;
int res;
memset(&server, 0, sizeof(server_t));
server.state = MSG_WRITE;
// setup the message we're going to echo
memset(&echo_msg, 0, sizeof(msg_t));
echo_msg.length = strlen(MESSAGE) + 1;
echo_msg.buffer = malloc(echo_msg.length);
strncpy(echo_msg.buffer, MESSAGE, echo_msg.length);
// 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");
finish(EXIT_FAILURE);
}
fcntl(server.fd, F_SETFL, O_NONBLOCK);
// connect the socket
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");
finish(EXIT_FAILURE);
}
res = connect(server.fd, (struct sockaddr *)&addr, sizeof(addr));
if (res == -1 && errno != EINPROGRESS) {
perror("connect failed");
finish(EXIT_FAILURE);
}
#if EMSCRIPTEN
emscripten_set_main_loop(main_loop, 0, 0);
#else
while (1) main_loop(NULL);
#endif
return EXIT_SUCCESS;
}
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