socketpair

- create a pair of connected sockets

Synopsis

cc [ flag ... ] file ... -lsocket -lnsl [ library ... ]
#include <sys/types.h>
#include <sys/socket.h>

int socketpair(int domain, int type, int protocol, int sv[2]);

Description

The socketpair() library call creates an unnamed pair of connected sockets in the specified address family domain, of the specified type, that uses the optionally specified protocol. The descriptors that are used in referencing the new sockets are returned in sv[0] and sv[1]. The two sockets are indistinguishable.

Return Values

socketpair() returns -1 on failure and 0 on success.

Errors

The call succeeds unless:

EAFNOSUPPORT

The specified address family is not supported on this machine.

EMFILE

Too many descriptors are in use by this process.

ENOMEM

There was insufficient user memory for the operation to complete.

ENOSR

There were insufficient STREAMS resources for the operation to complete.

EOPNOTSUPP

The specified protocol does not support creation of socket pairs.

EPROTONOSUPPORT

The specified protocol is not supported on this machine.

EACCES

The process does not have appropriate privileges.

Attributes

See attributes(5) for descriptions of the following attributes:

See Also

pipe(2), read(2), write(2), socket.h(3HEAD), attributes(5)

Notes

This call is currently implemented only for the AF_UNIX address family.