SHUTDOWN
Section: Linux Programmer's Manual (2)
Updated: 2018-04-30
Page Index
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.
CONFORMING TO
POSIX.1-2001, POSIX.1-2008, 4.4BSD
(
shutdown()
first appeared in 4.2BSD).
NOTES
The constants
SHUT_RD,
SHUT_WR,
SHUT_RDWR
have the value 0, 1, 2,
respectively, and are defined in
<sys/socket.h>
since glibc-2.1.91.
BUGS
Checks for the validity of
how
are done in domain-specific code,
and before Linux 3.7 not all domains performed these checks.
Most notably, UNIX domain sockets simply ignored invalid values.
This problem was fixed for UNIX domain sockets
in Linux 3.7.
SEE ALSO
close(2),
connect(2),
socket(2),
socket(7)
COLOPHON
This page is part of release 5.10 of the Linux
man-pages
project.
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
https://www.kernel.org/doc/man-pages/.