io_closeonexec - mark a file descriptor non-inheritable

       io_closeonexec  marks  a file descriptor non-inheritable.  It will be automatically closed if the process
       executes a different one.  The descriptor will not be automatically closed when you fork()  a  new  child
       process, though.

       io_closeonexec - mark a file descriptor non-inheritable

io_wait(3), io_canwrite(3)

                                                                                               io_closeonexec(3)

#include<libowfat/io.h>

       void io_closeonexec(int64 fd);