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.

       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 3.54 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/.