SOCKETPAIR(2) OpenBSD Programmer's Manual SOCKETPAIR(2)NAMEsocketpair - 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);
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 VALUES
A 0 is returned if the call succeeds, -1 if it fails.
ERRORS
The call succeeds unless:
[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.
[ENFILE] The system file table is full.
SEE ALSOpipe(2), read(2), write(2)STANDARDS
The socketpair() function conforms to X/Open Portability Guide Issue 4.2
(``XPG4.2'').
HISTORY
The socketpair() function call appeared in 4.2BSD.
BUGS
This call is currently implemented only for the LOCAL domain. Many
operating systems only accept a protocol of PF_UNSPEC, so that should be
used instead of PF_LOCAL for maximal portability.
OpenBSD 4.9 May 31, 2007 OpenBSD 4.9