SHUTDOWN(3POSIX)

PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult 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(), pselect(), read(), recv(), recvfrom(), recvmsg(), send(), sendto(), setsockopt(), socket(), write()

The Base Definitions volume of POSIX.1-2017, <sys_socket.h>

COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .