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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
#define EXPECTED_BYTES 5
int sockfd = -1;
void finish(int result) {
close(sockfd);
#if EMSCRIPTEN
REPORT_RESULT();
#endif
exit(result);
}
void iter(void *arg) {
static int retries = 0;
fd_set sett;
FD_ZERO(&sett);
FD_SET(sockfd, &sett);
// currently, we've connected to a closed server port.
// the initial async connect "succeeded" and select
// should say that the socket is ready for a non-blocking
// read, however, the read should be 0 sized signalling
// that the remote end has closed.
int handles = select(64, &sett, NULL, NULL, NULL);
if (handles == -1) {
perror("select failed");
finish(EXIT_FAILURE);
}
if (FD_ISSET(sockfd, &sett)) {
char buffer[1024];
int n = recv(sockfd, buffer, sizeof(buffer), 0);
if (n == -1 && retries++ > 10) {
perror("recv failed");
finish(EXIT_FAILURE);
} else if (!n) {
perror("Connection to websocket server failed as expected.");
finish(266);
}
}
}
// This is for testing a websocket connection to a closed server port.
// The connect call will succeed (due to the asynchronous websocket
// behavior) but once the underlying websocket system realized that
// the connection cannot be established, the next select call will fail.
int main() {
struct sockaddr_in addr;
int res;
sockfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sockfd == -1) {
perror("cannot create socket");
finish(EXIT_FAILURE);
}
fcntl(sockfd, 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");
finish(EXIT_FAILURE);
}
// This call should succeed (even if the server port is closed)
res = connect(sockfd, (struct sockaddr *)&addr, sizeof(addr));
if (res == -1 && errno != EINPROGRESS) {
perror("connect failed");
finish(EXIT_FAILURE);
}
#if EMSCRIPTEN
emscripten_set_main_loop(iter, 0, 0);
#else
while (1) iter(NULL);
#endif
return EXIT_FAILURE;
}
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