shutdown - shut down part of a full-duplex connection

       Checks  for  the  validity  of how are done in domain-specific code, and before Linux 3.7 not all domains
       performed these checks.  Most notably, UNIX domain sockets simply ignored invalid values.   This  problem
       was fixed for UNIX domain sockets in Linux 3.7.

       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.

EBADFsockfd is not a valid file descriptor.

       EINVAL An invalid value was specified in how (but see BUGS).

       ENOTCONN
              The specified socket is not connected.

       ENOTSOCK
              The file descriptor sockfd does not refer to a socket.

       POSIX.1-2001, 4.4BSD (first appeared in 4.2BSD).

       Standard C library (libc, -lc)

       shutdown - shut down part of a full-duplex connection

       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.

       On success, zero is returned.  On error, -1 is returned, and errno is set to indicate the error.

close(2), connect(2), socket(2), socket(7)

Linux man-pages 6.9.1                              2024-05-02                                        shutdown(2)

       POSIX.1-2008.

#include<sys/socket.h>intshutdown(intsockfd,inthow);