shutdown(2) - Linux manual page (original) (raw)

shutdown(2) System Calls Manual shutdown(2)

NAME top

   shutdown - shut down part of a full-duplex connection

LIBRARY top

   Standard C library (_libc_, _-lc_)

SYNOPSIS top

   **#include <sys/socket.h>**

   **int shutdown(int** _sockfd_**, int** _how_**);**

DESCRIPTION top

   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 top

   On success, zero is returned.  On error, -1 is returned, and _[errno](../man3/errno.3.html)_
   is set to indicate the error.

ERRORS top

   **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 top

   POSIX.1-2008.

HISTORY top

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

NOTES top

   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 top

   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 top

   [close(2)](../man2/close.2.html), [connect(2)](../man2/connect.2.html), [socket(2)](../man2/socket.2.html), [socket(7)](../man7/socket.7.html)

COLOPHON top

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Linux man-pages 6.10 2024-07-23 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)