shutdown(2) — Linux manual page

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

COLOPHON         top

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Linux man-pages 6.15            2025-05-17                    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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