Shuts down all or part of a full-duplex connection.

int shutdown(
    int s,
    int how
);

Parameters

s

A connected socket.

how

Specifies what part(s) of the connection to shut down:

Value	Mnemonic	Description
0	SHUT_RD	Disallow further receives.
1	SHUT_WR	Disallow further sends.
2	SHUT_RDWR	Disallow further receives and sends.

Remarks

This call closes the socket when you disallow both receive and send functions. This can occur with a how of 2, or with subsequent calls specifying a how of 1 and a how of 0.

Return Values

0 (zero)

Success.

-1 and the function sets errno to one of these values:

EBADF	Invalid file descriptor or file not opened for writing.
ENOSPC	No space left on device.

Failure.

Requirements