SHUTDOWN(2)
NAME
shutdown - shut down part of a full-duplex connection
SYNOPSIS
#include <sys/socket.h>
int shutdown(int sockfd, int how);
DESCRIPTION
The shutdown() call causes all or part of a full-duplex connection on the socket associated with sockfd to be shut down. If how is SHUT_RD, further receptions will be disallowed. If how is SHUT_WR, further transmissions will be disallowed. If how is SHUT_RDWR, further receptions and transmissions will be disallowed.
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS
EBADF sockfd is not a valid file descriptor.
EINVAL An invalid value was specified in how (but see BUGS).
ENOTCONN The specified socket is not connected.
ENOTSOCK The file descriptor sockfd does not refer to a socket.