socketpair(2)
NAME
socketpair − create a pair of connected sockets
SYNTAX
#include <sys/types.h>
#include <sys/socket.h>
int socketpair(d, type, protocol, sv)
int d, type, protocol, sv[2];
DESCRIPTION
The socketpair system call creates an unnamed pair of connected sockets in the specified domain d, of the specified type, and using the optionally specified protocol. The descriptors used in referencing the new sockets are returned in sv[0] and sv[1]. The two sockets are indistinguishable.
RETURN VALUE
If unsuccessful, returns a −1, and the global variable errno indicates the error code.
DIAGNOSTICS
The socketpair call will fail if:
[EMFILE] Too many descriptors are in use by this process.
[EAFNOSUPPORT] The specified address family is not supported on this machine.
[EPROTONOSUPPORT] The specified protocol is not supported on this machine.
[EOPNOSUPPORT] The specified protocol does not support creation of socket pairs.
[EFAULT] The specified sv does not specify a valid part of the process address space.