.TH ndelay_on 3 .SH NAME ndelay_on \- put file descriptor in non-blocking mode .SH SYNTAX .B #include extern int \fBndelay_on\fP(int \fIfd\fR); .SH DESCRIPTION ndelay_on puts a file descriptor in non-blocking mode. Reading from and writing to non-blocking network sockets, FIFOs or device files will return immediately, even if not as many bytes have been processed as were specified. If an error occurred, ndelay_on will return nonzero and set \fIerrno\fR accordingly. .SH "SEE ALSO" fcntl(2), ndelay_off(3)