SHUTDOWN(2) System Calls Manual SHUTDOWN(2)

shutdownshut down part of a full-duplex connection

#include <sys/socket.h>

shutdown(int socket, int how);

The () call causes all or part of a full-duplex connection on the socket associated with socket to be shut down. If how is SHUT_RD, further receives will be disallowed. If how is SHUT_WR, further sends will be disallowed. If how is SHUT_RDWR, further sends and receives will be disallowed.

The shutdown() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

The call succeeds unless:

Socket is not a valid descriptor.
The how argument is invalid.
The specified socket is not connected.
Socket is a file, not a socket.

connect(2), connectx(2), disconnectx(2), socket(2)

The shutdown() function call appeared in 4.2BSD.

March 18, 2015 BSD 4.2