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Linux 2.6 - man page for shutdown (linux section 2)

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 3.55 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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