#include #include #include #include #include #include #include #include #include #include #include #if EMSCRIPTEN #include #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; }