socketpair (2)

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(The comments found at the beginning of the groff file "man2/socketpair.2freebsd".)

NAME

socketpair - create a pair of connected sockets

LIBRARY

Lb libc

SYNOPSIS

In sys/types.h In sys/socket.h Ft int Fn socketpair int fd int type int protocol int *sv

DESCRIPTION

The Fn socketpair system call creates an unnamed pair of connected sockets in the specified domain Fa fd , of the specified Fa type , and using the optionally specified Fa protocol . The descriptors used in referencing the new sockets are returned in Fa sv Ns [0] and Fa sv Ns [1] . The two sockets are indistinguishable.

The SOCK_CLOEXEC and SOCK_NONBLOCK flags in the Fa type argument apply to both descriptors.

RETURN VALUES

Rv -std socketpair

ERRORS

The call succeeds unless:

Bq Er EMFILE

Too many descriptors are in use by this process.

Bq Er EAFNOSUPPORT

The specified address family is not supported on this machine.

Bq Er EPROTONOSUPPORT

The specified protocol is not supported on this machine.

Bq Er EOPNOTSUPP

The specified protocol does not support creation of socket pairs.

Bq Er EFAULT

The address Fa sv does not specify a valid part of the process address space.

SEE ALSO

pipe(2), read(2), socket(2), write(2)

HISTORY

The Fn socketpair system call appeared in BSD 4.2

BUGS

This call is currently implemented only for the UNIX domain.