SOCKETPAIR(2) BSD System Calls Manual SOCKETPAIR(2)NAMEsocketpair — 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 ALSOsocket(2), read(2), write(2), compat(5)BUGS
This call is currently implemented only for the UNIX domain.
HISTORY
The socketpair() function call appeared in 4.2BSD.
4.2 Berkeley Distribution June 4, 1993 4.2 Berkeley Distribution
