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   socketpair    ( 2 )

создать пару соединенных розеток (create a pair of connected sockets)

Имя (Name)

socketpair - create a pair of connected sockets

Синопсис (Synopsis)

#include <sys/socket.h>

int socketpair(int domain, int type, int protocol, int sv[2]);


Описание (Description)

The socketpair() call creates an unnamed pair of connected
       sockets in the specified domain, of the specified type, and using
       the optionally specified protocol.  For further details of these
       arguments, see socket(2).

The file descriptors used in referencing the new sockets are returned in sv[0] and sv[1]. The two sockets are indistinguishable.


Возвращаемое значение (Return value)

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

On Linux (and other systems), socketpair() does not modify sv on failure. A requirement standardizing this behavior was added in POSIX.1-2008 TC2.


Ошибки (Error)

EAFNOSUPPORT
              The specified address family is not supported on this
              machine.

EFAULT The address sv does not specify a valid part of the process address space.

EMFILE The per-process limit on the number of open file descriptors has been reached.

ENFILE The system-wide limit on the total number of open files has been reached.

EOPNOTSUPP The specified protocol does not support creation of socket pairs.

EPROTONOSUPPORT The specified protocol is not supported on this machine.


Стандарты (Conforming to)

POSIX.1-2001, POSIX.1-2008, 4.4BSD.  socketpair() first appeared
       in 4.2BSD.  It is generally portable to/from non-BSD systems
       supporting clones of the BSD socket layer (including System V
       variants).

Примечание (Note)

On Linux, the only supported domains for this call are AF_UNIX
       (or synonymously, AF_LOCAL) and AF_TIPC (since Linux 4.12).

Since Linux 2.6.27, socketpair() supports the SOCK_NONBLOCK and SOCK_CLOEXEC flags in the type argument, as described in socket(2).


Смотри также (See also)

pipe(2), read(2), socket(2), write(2), socket(7), unix(7)