shutdown(2) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | BUGS | SEE ALSO | COLOPHON

SHUTDOWN(2)             Linux Programmer's Manual            SHUTDOWN(2)

NAME         top

       shutdown - shut down part of a full-duplex connection

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.

CONFORMING TO         top

       POSIX.1-2001, POSIX.1-2008, 4.4BSD (shutdown() 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

       This page is part of release 5.13 of the Linux man-pages project.
       A description of the project, information about reporting bugs,
       and the latest version of this page, can be found at
       https://www.kernel.org/doc/man-pages/.

Linux                          2021-03-22                    SHUTDOWN(2)

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