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)
