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SHUTDOWN(2) System Calls Manual SHUTDOWN(2) NAME shutdown - shut down part of a full-duplex connection LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <sys/socket.h> int shutdown(int s, int how); DESCRIPTION The shutdown() call causes all or part of a full-duplex connection on the socket associated with s to be shut down. The how argument specifies which part of the connection will be shut down. Permissible values are: SHUT_RD further receives will be disallowed. SHUT_WR further sends will be disallowed. SHUT_RDWR further sends and receives will be disallowed. RETURN VALUES A 0 is returned if the call succeeds, -1 if it fails. ERRORS The call succeeds unless: [EBADF] s is not a valid descriptor. [EINVAL] The how argument is invalid. [ENOTCONN] The specified socket is not connected. [ENOTSOCK] s is a file, not a socket. SEE ALSO connect(2), socket(2) HISTORY The shutdown() function call appeared in 4.2BSD. The how arguments used to be simply 0, 1, and 2, but now have named values as specified by X/Open Portability Guide Issue 4 ("XPG4"). NetBSD 8.0 August 18, 2002 NetBSD 8.0