NAME

       shutdown - shut down socket send and receive operations

SYNOPSIS

       #include <sys/socket.h>

       int shutdown(int socket, int how);

DESCRIPTION

       The  shutdown() function shall cause all or part of a full-duplex connection on the socket
       associated with the file descriptor socket to be shut down.

       The shutdown() function takes the following arguments:

       socket Specifies the file descriptor of the socket.

       how    Specifies the type of shutdown. The values are as follows:

       SHUT_RD
              Disables further receive operations.

       SHUT_WR
              Disables further send operations.

       SHUT_RDWR
              Disables further send and receive operations.

       The shutdown() function disables subsequent send and/or receive operations  on  a  socket,
       depending on the value of the how argument.

RETURN VALUE

       Upon successful completion, shutdown() shall return 0; otherwise, -1 shall be returned and
       errno set to indicate the error.

ERRORS

       The shutdown() function shall fail if:

       EBADF  The socket argument is not a valid file descriptor.

       EINVAL The how argument is invalid.

       ENOTCONN
              The socket is not connected.

       ENOTSOCK
              The socket argument does not refer to a socket.

       The shutdown() function may fail if:

       ENOBUFS
              Insufficient resources were available in the system to perform the operation.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       getsockopt() , read() , recv() , recvfrom() , recvmsg() , select() , send() ,  sendto()  ,
       setsockopt()  ,  socket() , write() , the Base Definitions volume of IEEE Std 1003.1-2001,
       <sys/socket.h>

COPYRIGHT

       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1,  2003  Edition,  Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  of  Electrical  and  Electronics Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE  and  The  Open  Group
       Standard,  the  original  IEEE  and  The  Open Group Standard is the referee document. The
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .