shutdown - shut down part of a full-duplex connection
int shutdown(int sockfd, int
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
- 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
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.
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