shutdown - shut down part of a full-duplex connection
int shutdown(int s, int how);
The shutdown call causes all or part of a full-duplex con
nection on the socket associated with s to be shut down.
If how is 0, further receives will be disallowed. If how
is 1, further sends will be disallowed. If how is 2, fur
ther sends and receives will be disallowed.
On success, zero is returned. On error, -1 is returned,
and errno is set appropriately.
EBADF s is not a valid descriptor.
s is a file, not a socket.
The specified socket is not connected.
4.4BSD (the shutdown function call first appeared in
The numerical how flags should be replaced by the Single
Unix-mandated SHUT_RD, SHUT_WR, and SHUT_RDWR flags.