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(1,8) the
specified domain d, of the specified type, and using the optionally
specified protocol. The descriptors used in(1,8) referencing the new sock-
ets are returned in(1,8) sv[0] and sv[1]. The two sockets are indistin-
guishable.
RETURN VALUE
On success, zero is returned. On error(8,n), -1 is returned, and errno is
set(7,n,1 builtins) appropriately.
ERRORS
EAFNOSUPPORT
The specified address family is not supported on this machine.
EFAULT The address sv does not specify a valid part of the process
address space.
EMFILE Too many descriptors are in(1,8) use by this process.
ENFILE The system limit on the total number of open(2,3,n) files has been
reached.
EOPNOTSUPP
The specified protocol does not support creation of socket(2,7,n)
pairs.
EPROTONOSUPPORT
The specified protocol is not supported on this machine.
CONFORMING TO
4.4BSD, SUSv2, POSIX 1003.1-2001. The socketpair function call
appeared in(1,8) 4.2BSD. It is generally portable to/from non-BSD systems
supporting clones of the BSD socket(2,7,n) layer (including System V vari-
ants).
NOTES
On Linux, the only supported domain for this call is AF_UNIX (or syn-
onymously, AF_LOCAL). (Most implementations have the same restric-
tion.)
SEE ALSO
pipe(2,8)(2), read(2,n,1 builtins)(2), socket(2,7,n)(2), write(1,2)(2), unix(7)
Linux 2.6.7 2004-06-17 SOCKETPAIR(2)