io_trywritetimeout - write to a descriptor without blocking

       io_trywritetimeout is identical to io_trywrite, with the following exception: if

       •  io_trywrite returns -1 (the descriptor is not ready for writing), and

       •  the descriptor has a timeout, and

       •  the write attempt was after the descriptor's timeout,

       then io_trywritetimeout instead returns -2, with errno set to ETIMEDOUT.

       io_trywritetimeout - write to a descriptor without blocking

io_nonblock(3), io_waitwrite(3), io_trywrite(3)

                                                                                           io_trywritetimeout(3)

#include<libowfat/io.h>

       int io_trywritetimeout(int64 fd,const char* buf,int64 len);