shutdown(2) — Linux manual page

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 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 to indicate the error.

ERRORS

       EBADF  sockfd 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.

STANDARDS

       POSIX.1-2008.

HISTORY

       POSIX.1-2001, 4.4BSD (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

       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.

SEE ALSO

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

COLOPHON

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

Pages that refer to this page: close(2), io_uring_enter2(2), io_uring_enter(2), recv(2), send(2), socket(2), socketcall(2), syscalls(2), io_uring_prep_shutdown(3), sd_listen_fds(3), systemd.socket(5), signal-safety(7), sock_diag(7), socket(7), lsof(8)

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