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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 <sys/ioctl.h>
#include <assert.h>
#if EMSCRIPTEN
#include <emscripten.h>
#endif
#define EXPECTED_BYTES 5
int SocketFD;
int done = 0;
void iter(void *arg) {
static char readbuf[1024];
static int readPos = 0;
fd_set sett;
FD_ZERO(&sett);
FD_SET(SocketFD, &sett);
if( readPos < 7 ){
// still reading
int selectRes = select(64, &sett, NULL, NULL, NULL);
if( selectRes == 0 )
return;
if( selectRes == -1 ){
perror( "Connection to websocket server failed" );
exit(EXIT_FAILURE);
}
if( selectRes > 0 ){
assert(FD_ISSET(SocketFD, &sett));
int bytesRead = recv( SocketFD, readbuf+readPos, 7-readPos, 0 );
readPos += bytesRead;
}
} else {
// here the server should have closed the connection
int selectRes = select(64, &sett, NULL, NULL, NULL);
if( selectRes == 0 )
return;
if( selectRes == -1 ){
perror( "Connection to websocket server failed as expected" );
int result = 266;
REPORT_RESULT();
emscripten_cancel_main_loop();
done = 1;
}
if( selectRes > 0 ){
printf( "Error: socket should not show up on select call anymore.\n" );
exit(EXIT_FAILURE);
}
}
return;
}
// Scenario: the server sends data and closes the connection after 7 bytes.
// This test should provoke the situation in which the underlying
// tcp connection has been torn down already but there is still data
// in the inQueue. The select call has to succeed as long the queue
// still contains data and only then start to throw errors.
int main(void)
{
struct sockaddr_in stSockAddr;
int Res;
SocketFD = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (-1 == SocketFD)
{
perror("cannot create socket");
exit(EXIT_FAILURE);
}
memset(&stSockAddr, 0, sizeof(stSockAddr));
stSockAddr.sin_family = AF_INET;
stSockAddr.sin_port = htons(
#if EMSCRIPTEN
8995
#else
8994
#endif
);
Res = inet_pton(AF_INET, "127.0.0.1", &stSockAddr.sin_addr);
if (0 > Res) {
perror("error: first parameter is not a valid address family");
close(SocketFD);
exit(EXIT_FAILURE);
} else if (0 == Res) {
perror("char string (second parameter does not contain valid ipaddress)");
close(SocketFD);
exit(EXIT_FAILURE);
}
// This call should succeed (even if the server port is closed)
if (-1 == connect(SocketFD, (struct sockaddr *)&stSockAddr, sizeof(stSockAddr))) {
perror("connect failed");
close(SocketFD);
exit(EXIT_FAILURE);
}
#if EMSCRIPTEN
emscripten_set_main_loop(iter, 0, 0);
#else
while (!done) iter(NULL);
#endif
return EXIT_SUCCESS;
}
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