Checks if the last error is a serious error or just a special behaviour error of non-blocking sockets (for example an error returned because the socket would block or because the asynchronous operation was successfully started but not finished yet).
$(D_KEYWORD false) if a serious error happened, $(D_KEYWORD true) otherwise.
See Implementation
Checks if the last error is a serious error or just a special behaviour error of non-blocking sockets (for example an error returned because the socket would block or because the asynchronous operation was successfully started but not finished yet).