SHUTDOWN(3P)                                        POSIX Programmer's Manual                                       SHUTDOWN(3P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

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,  Copy-
       right (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.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                  SHUTDOWN(3P)