shutdown - shut down part of a full-duplex connection
#include <sys/socket.h>
int shutdown(int sockfd
, int
how
);
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.
On success, zero is returned. On error, -1 is returned, and
errno
is set appropriately.
sockfd
is not a valid file descriptor.
An invalid value was specified in how
(but see BUGS).
The specified socket is not connected.
The file descriptor sockfd
does not refer to a socket.
POSIX.1-2001, POSIX.1-2008, 4.4BSD (shutdown() first appeared in 4.2BSD).
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.
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.
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/.