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In dynamically typed programming languages. instead of declaring a variable to have a particular type, the type of a variable is determined by an A.I. in the operating system.
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shutdown(2) [linux man page]

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)

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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. 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 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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