shutdown - shut down part of a full-duplex connection
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 4.15 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/.