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SOCKETPAIR(2) NetBSD System Calls Manual SOCKETPAIR(2)
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socketpair -- create a pair of connected sockets
Standard C Library (libc, -lc)
socketpair(int d, int type, int protocol, int *sv);
The socketpair() call creates an unnamed pair of connected sockets in the
specified domain d, of the specified type, and using the optionally spec-
ified protocol. The descriptors used in referencing the new sockets are
returned in sv and sv. The two sockets are indistinguishable.
The type and protocol argument values are described in socket(2).
A 0 is returned if the call succeeds, -1 if it fails.
The call succeeds unless:
[EAFNOSUPPORT] The specified address family is not supported on this
[EFAULT] The address sv does not specify a valid part of the
process address space.
[EMFILE] Too many descriptors are in use by this process.
[ENFILE] The system file table is full.
[EOPNOTSUPP] The specified protocol does not support creation of
[EPROTONOSUPPORT] The specified protocol is not supported on this
pipe(2), read(2), socket(2), write(2)
The socketpair() function call appeared in 4.2BSD.
This call is currently implemented only for the PF_LOCAL domain.
NetBSD 9.3 June 24, 2011 NetBSD 9.3