shutdown - shut down part of a full-duplex connection
int shutdown(int sockfd, int how);
() call causes all or part of a full-duplex connection on the
socket associated with sockfd
to be shut down. If how
, further receptions will be disallowed. If how
, further transmissions will be disallowed. If how
, further receptions and transmissions will be disallowed.
On success, zero is returned. On error, -1 is returned, and errno
- 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
have the value 0,
1, 2, respectively, and are defined in <sys/socket.h>
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.