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SHUTDOWN(2)                         Linux Programmer's Manual                         SHUTDOWN(2)



NAME
       shutdown - shut down part of a full-duplex connection

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 associ-
       ated with sockfd to be shut down.  If how is SHUT_RD, further receptions  will  be  disal-
       lowed.  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 appropriately.

ERRORS
       EBADF  sockfd is not a valid descriptor.

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

       ENOTCONN
              The specified socket is not connected.

       ENOTSOCK
              sockfd is a file, not a socket.

CONFORMING TO
       POSIX.1-2001, 4.4BSD (the shutdown() function call 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
       As currently implemented, checks for the validity of how are done in domain-specific code,
       and not all domains perform these checks.  Most notably, UNIX domain sockets simply ignore
       invalid values; this may change in the future.

SEE ALSO
       connect(2), socket(2), socket(7)

COLOPHON
       This  page  is  part of release 3.53 of the Linux man-pages project.  A description of the
       project,    and    information    about    reporting    bugs,    can    be    found     at
       http://www.kernel.org/doc/man-pages/.



Linux                                       2012-09-06                                SHUTDOWN(2)

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