NAME
socketpair
—
create a pair of connected
sockets
SYNOPSIS
#include
<sys/socket.h>
int
socketpair
(int domain,
int type, int protocol,
int socket_vector[2]);
DESCRIPTION
The
socketpair
()
call creates an unnamed pair of connected sockets in the specified domain
domain, of the specified type,
and using the optionally specified protocol. The
descriptors used in referencing the new sockets are returned in
socket_vector[0] and
socket_vector[1]. The two sockets are
indistinguishable.
RETURN VALUES
The socketpair
() function returns the
value 0 if successful; otherwise the value -1 is returned and
the global variable errno is set to indicate the
error.
ERRORS
The call succeeds unless:
- [
EAFNOSUPPORT
] - The specified address family is not supported on this machine.
- [
EFAULT
] - The address socket_vector does not specify a valid part of the process address space.
- [
EMFILE
] - No more file descriptors are available for this process.
- [
ENFILE
] - No more file descriptors are available for the system.
- [
ENOBUFS
] - Insufficient resources were available in the system to perform the operation.
- [
ENOMEM
] - Insufficient memory was available to fulfill the request.
- [
EOPNOTSUPP
] - The specified protocol does not support creation of socket pairs.
- [
EPROTONOSUPPORT
] - The specified protocol is not supported on this machine.
- [
EPROTOTYPE
] - The socket type is not supported by the protocol.
- [
EACCES
] - The process does not have appropriate privileges to create a socket of the specified type and/or protocol.
LEGACY SYNOPSIS
#include
<sys/types.h>
#include
<sys/socket.h>
The include file
<sys/types.h>
is
necessary.
SEE ALSO
BUGS
This call is currently implemented only for the UNIX domain.
HISTORY
The socketpair
() function call appeared in
4.2BSD.