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RedHat 9 (Linux i386) - man page for socketpair (redhat section 2)

SOCKETPAIR(2)						     Linux Programmer's Manual						     SOCKETPAIR(2)

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 indistin- guishable.
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 (the socketpair function call appeared in 4.2BSD). 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 restric- tion.)
SEE ALSO
read(2), write(2), pipe(2), socket(2), unix(7) BSD Man Page 1993-07-24 SOCKETPAIR(2)