NAME
socketpair
- create a pair of connected sockets
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
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.
- [
ENFILE] -
The system file table is full.
- [
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.
SEE ALSO
pipe(2),
read(2),
write(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.