linux man page for shutdown

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 associated with sockfd to be shut down.  If how is
       SHUT_RD, further receptions will be disallowed.	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.

       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.

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

COLOPHON
       This  page is part of release 3.27 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								    2008-12-03							       SHUTDOWN(2)