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29 .\" @(#)shutdown.2 8.1 (Berkeley) 6/4/93
37 .Nd disable sends and/or receives on a socket
44 .Fn shutdown "int s" "int how"
48 system call disables sends or receives on a socket.
51 argument specifies the type of shutdown.
53 .Bl -tag -width ".Dv SHUT_RDWR"
55 Further receives will be disallowed.
57 Further sends will be disallowed.
58 This may cause actions specific to the protocol family of the socket
61 .Sx IMPLEMENTATION NOTES .
63 Further sends and receives will be disallowed.
68 If the file descriptor
72 socket, all or part of the full-duplex connection will be shut down.
74 .Sh IMPLEMENTATION NOTES
75 The following protocol specific actions apply to the use of
79 based on the properties of the socket associated with the file descriptor
81 .Bl -column ".Dv PF_INET6" ".Dv SOCK_STREAM" ".Dv IPPROTO_SCTP"
82 .It Sy Domain Ta Sy Type Ta Sy Protocol Ta Sy Return value and action
83 .It Dv PF_INET Ta Dv SOCK_DGRAM Ta Dv IPPROTO_SCTP Ta
89 .It Dv PF_INET Ta Dv SOCK_DGRAM Ta Dv IPPROTO_UDP Ta
94 .It Dv PF_INET Ta Dv SOCK_STREAM Ta Dv IPPROTO_SCTP Ta
96 Send queued data and tear down association.
97 .It Dv PF_INET Ta Dv SOCK_STREAM Ta Dv IPPROTO_TCP Ta
99 Send queued data, wait for ACK, then send FIN.
100 .It Dv PF_INET6 Ta Dv SOCK_DGRAM Ta Dv IPPROTO_SCTP Ta
106 .It Dv PF_INET6 Ta Dv SOCK_DGRAM Ta Dv IPPROTO_UDP Ta
111 .It Dv PF_INET6 Ta Dv SOCK_STREAM Ta Dv IPPROTO_SCTP Ta
113 Send queued data and tear down association.
114 .It Dv PF_INET6 Ta Dv SOCK_STREAM Ta Dv IPPROTO_TCP Ta
116 Send queued data, wait for ACK, then send FIN.
124 system call fails if:
129 argument is not a valid file descriptor.
135 The socket associated with the file descriptor
137 does not support this operation.
143 socket which is not connected.
147 argument does not refer to a socket.
157 system call is expected to comply with
163 system call appeared in
166 .Dv SHUT_RD , SHUT_WR ,
169 constants appeared in
173 This manual page was updated by
174 .An Bruce M. Simpson Aq bms@FreeBSD.org
184 .Dq Li "port unreachable"
185 message should be generated in response to
186 datagrams received on a local port to which