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CentOS 7.0 - man page for shutdown (centos 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 associated with sockfd to be shut down. If how is SHUT_RD, further receptions will be disallowed. If how is SHUT_WR, further transmis- sions 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 informa- tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2012-09-06 SHUTDOWN(2)


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