shutdown(2) - Linux man page

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 descriptor.
EINVAL: An invalid value was specified in how (but see BUGS).
ENOTCONN: The specified socket is not connected.
ENOTSOCK: sockfd is a file, not a socket.

Conforming to

POSIX.1-2001, 4.4BSD (the shutdown() function call 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

As currently implemented, checks for the validity of how are done in domain-specific code, and not all domains perform these checks. Most notably, UNIX domain sockets simply ignore invalid values; this may change in the future.

Referenced By

close(2), iv_fd_pump_pump(3), lsof(8), recv(2), send(2), socketcall(2)