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socketpair(2) -- Linux man page
NAME
socketpair - create a pair of connected sockets
SYNOPSIS
#include <sys/types.h>
#include <sys/socket.h>
int socketpair(int d, int type, int protocol, int sv[2]);
DESCRIPTION
The
socketpair
call creates an unnamed pair of connected sockets in
the specified domain
d,
of the specified
type,
and using the optionally specified
protocol.
The descriptors used in referencing the new sockets are returned in
sv[0]
and
sv[1].
The two sockets are indistinguishable.
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and
errno
is set appropriately.
ERRORS
- EMFILE
-
Too many descriptors are in use by this process.
- EAFNOSUPPORT
-
The specified address family is not supported on this machine.
- EPROTONOSUPPORT
-
The specified protocol is not supported on this machine.
- EOPNOTSUPP
-
The specified protocol does not support creation of socket pairs.
- EFAULT
-
The address
sv
does not specify a valid part of the process address space.
CONFORMING TO
4.4BSD, SUSv2, POSIX 1003.1-2001.
The
socketpair
function call appeared in 4.2BSD. It is generally portable to/from
non-BSD systems supporting clones of the BSD socket layer (including
System V variants).
NOTES
On Linux, the only supported domain for this call is
AF_UNIX
(or synonymously,
AF_LOCAL).
(Most implementations have the same restriction.)
SEE ALSO
read(2),
write(2),
pipe(2),
socket(2),
unix(7)
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