shutdown (8) ( FreeBSD man: Команды системного администрирования )
shutdown (8) ( Linux man: Команды системного администрирования )
BSD mandoc
NAME
shutdown
- disable sends and/or receives on a socket
LIBRARY
Lb libc
SYNOPSIS
#include <sys/types.h>
#include <sys/socket.h> int
shutdown (int s int how);
DESCRIPTION
The
shutdown ();
system call disables sends or receives on a socket.
The
Fa how
argument specifies the type of shutdown.
Possible values are:
SHUT_RD
Further receives will be disallowed.
SHUT_WR
Further sends will be disallowed.
This may cause actions specific to the protocol family of the socket
Fa s
to happen; see
Sx IMPLEMENTATION NOTES .
SHUT_RDWR
Further sends and receives will be disallowed.
Implies
SHUT_WR
If the file descriptor
Fa s
is associated with a
SOCK_STREAM
socket, all or part of the full-duplex connection will be shut down.
IMPLEMENTATION NOTES
The following protocol specific actions apply to the use of
SHUT_WR
(and potentially also
SHUT_RDWR )
based on the properties of the socket associated with the file descriptor
Fa s .
Domain Ta Type Ta Protocol Ta Return value and action
PF_INET Ta SOCK_DGRAM Ta IPPROTO_SCTP Ta Return -1.
The global variable
errno
will be set to
Er EOPNOTSUPP .
PF_INET Ta SOCK_DGRAM Ta IPPROTO_UDP Ta Return 0.
ICMP messages will
not
be generated.
PF_INET Ta SOCK_STREAM Ta IPPROTO_SCTP Ta Return 0.
Send queued data and tear down association.
PF_INET Ta SOCK_STREAM Ta IPPROTO_TCP Ta Return 0.
Send queued data, wait for ACK, then send FIN.
PF_INET6 Ta SOCK_DGRAM Ta IPPROTO_SCTP Ta Return -1.
The global variable
errno
will be set to
Er EOPNOTSUPP .
PF_INET6 Ta SOCK_DGRAM Ta IPPROTO_UDP Ta Return 0.
ICMP messages will
not
be generated.
PF_INET6 Ta SOCK_STREAM Ta IPPROTO_SCTP Ta Return 0.
Send queued data and tear down association.
PF_INET6 Ta SOCK_STREAM Ta IPPROTO_TCP Ta Return 0.
Send queued data, wait for ACK, then send FIN.
RETURN VALUES
Rv -std shutdown
ERRORS
The
shutdown ();
system call fails if:
Bq Er EBADF
The
Fa s
argument is not a valid file descriptor.
Bq Er EINVAL
The
Fa how
argument is invalid.
Bq Er EOPNOTSUPP
The socket associated with the file descriptor
Fa s
does not support this operation.
Bq Er ENOTCONN
The
Fa s
argument specifies a
SOCK_STREAM
socket which is not connected.
The
shutdown ();
system call is expected to comply with
St -p1003.1g-2000 ,
when finalized.
HISTORY
The
shutdown ();
system call appeared in
BSD 4.2
The
SHUT_RD , SHUT_WR
and
SHUT_RDWR
constants appeared in
St -p1003.1g-2000 .
AUTHORS
An -nosplit
This manual page was updated by
An Bruce M. Simpson Aq bms@FreeBSD.org
to reflect how
shutdown ();
behaves with
PF_INET
and
PF_INET6
sockets.
BUGS
The ICMP
``port unreachable
''
message should be generated in response to
datagrams received on a local port to which
Fa s
is bound
after
shutdown ();
is called.
