ndelay_off - put file descriptor in non-blocking mode

       ndelay_off  puts  a  file  descriptor  in  blocking  mode.   Reading from and writing to blocking network
       sockets, FIFOs or device files will possibly not return immediately but wait  on  more  input  or  buffer
       space for output.

       If an error occurred, ndelay_off will return nonzero and set errno accordingly.

       ndelay_off - put file descriptor in non-blocking mode

fcntl(2), ndelay_on(3)

                                                                                                   ndelay_off(3)

#include<libowfat/ndelay.h>

       extern int ndelay_off(int fd);