[英]non blocking TCP-acceptor not reading from socket
我在下面的代碼中實現了非阻塞TCP接受器。 客戶端可以毫無問題地進行連接,並且寫入似乎也正在發生,但是接受器不會從套接字讀取任何內容,並且對read()
的調用會無限期地阻塞。 我為接收器使用了錯誤的設置嗎?
親切的問候AFG
int main(){
create_programming_socket();
poll_programming_connect();
while(1){
poll_programming_read();
}
}
int create_programming_socket(){
int cnt = 0;
p_listen_socket = socket( AF_INET, SOCK_STREAM, 0 );
if( p_listen_socket < 0 ){
return 1;
}
int flags = fcntl( p_listen_socket, F_GETFL, 0 );
if( fcntl( p_listen_socket, F_SETFL, flags | O_NONBLOCK ) == -1 ){
return 1;
}
bzero( (char*)&p_serv_addr, sizeof(p_serv_addr) );
p_serv_addr.sin_family = AF_INET;
p_serv_addr.sin_addr.s_addr = INADDR_ANY;
p_serv_addr.sin_port = htons( p_port );
if( bind( p_listen_socket, (struct sockaddr*)&p_serv_addr
, sizeof(p_serv_addr) ) < 0 ) {
return 1;
}
listen( p_listen_socket, 5 );
return 0;
}
int poll_programming_connect(){
int retval = 0;
static socklen_t p_clilen = sizeof(p_cli_addr);
int res = accept( p_listen_socket, (struct sockaddr*)&p_cli_addr, &p_clilen );
if( res > 0 ){
p_conn_socket = res;
int flags = fcntl( p_conn_socket, F_GETFL, 0 );
if( fcntl( p_conn_socket, F_SETFL, flags | O_NONBLOCK ) == -1 ){
retval = 1;
}else{
p_connected = true;
}
}else if( res == -1 && ( errno == EWOULDBLOCK || errno == EAGAIN ) ) {
//printf( "poll_sock(): accept(c_listen_socket) would block\n");
}else{
retval = 1;
}
return retval;
}
int poll_programming_read(){
int retval = 0;
bzero( p_buffer, 256 );
int numbytes = read( p_conn_socket, p_buffer, 255 );
if( numbytes > 0 ) {
fprintf( stderr, "poll_sock(): read() read %d bytes\n", numbytes );
int fred;
int i;
} else if( numbytes == -1 && ( errno == EWOULDBLOCK || errno == EAGAIN ) ) {
//printf( "poll_sock(): read() would block\n");
} else {
close( p_conn_socket );
p_connected = false;
retval = 1;
}
return retval;
}
對poll_programming_connect
的調用不在您的while循環之外-因此它很可能不接受連接(EWOULDBLOCK失敗)。 因此,您沒有有效的套接字可以讀取。
您需要等到建立連接后才能調用poll_programming_read
。
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