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socketpair() - Unix, Linux System Call
socketpair - create a pair of connected sockets
int socketpair(int d, int type, int protocol, int sv);
socketpair() 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. The two sockets are indistinguishable.
On success, zero is returned. On error, -1 is returned, and
errno is set appropriately.
The specified address family is not supported on this machine.
sv does not specify a valid part of the process address space.
Too many descriptors are in use by this process.
The system limit on the total number of open files has been reached.
The specified protocol does not support creation of socket pairs.
The specified protocol is not supported on this machine.
socketpair() function call appeared in 4.2BSD. It is generally portable to/from
non-BSD systems supporting clones of the BSD socket layer (including
System V variants).
On Linux, the only supported domain for this call is
AF_UNIX (or synonymously,
AF_LOCAL). (Most implementations have the same restriction.)