NAME

       shutdown - shut down part of a full-duplex connection

LIBRARY

       Standard C library (libc, -lc)

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 to indicate  the
       error.

ERRORS

       EBADF  sockfd is not a valid file descriptor.

       EINVAL An invalid value was specified in how (but see BUGS).

       ENOTCONN
              The specified socket is not connected.

       ENOTSOCK
              The file descriptor sockfd does not refer to a socket.

STANDARDS

       POSIX.1-2008.

HISTORY

       POSIX.1-2001, 4.4BSD (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

       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.

SEE ALSO

       close(2), connect(2), socket(2), socket(7)