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+>SOCKETPAIR(2) System Calls Manual SOCKETPAIR(2)
+
+NAME
+ socketpair - create a pair of connected sockets
+
+SYNOPSIS
+ #include <sys/types.h>
+ #include <sys/socket.h>
+
+ int
+ socketpair(int d, int type, int protocol, int *sv);
+
+DESCRIPTION
+ The socketpair() call creates an unnamed pair of connected sockets in the
+ specified domain d, of the specified type, and using the optionally spec-
+ ified protocol. The descriptors used in referencing the new sockets are
+ returned in sv[0] and sv[1]. The two sockets are indistinguishable.
+
+RETURN VALUES
+ A 0 is returned if the call succeeds, -1 if it fails.
+
+ERRORS
+ The call succeeds unless:
+
+ [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.
+
+ [EOPNOTSUPP] The specified protocol does not support creation of
+ socket pairs.
+
+ [EFAULT] The address sv does not specify a valid part of the
+ process address space.
+
+ [ENFILE] The system file table is full.
+
+SEE ALSO
+ pipe(2), read(2), write(2)
+
+BUGS
+ This call is currently implemented only for the LOCAL domain. Many oper-
+ ating systems only accept a protocol of PF_UNSPEC, so that should be used
+ instead of PF_LOCAL for maximal portability.
+
+STANDARDS
+ The socketpair() function conforms to X/Open Portability Guide Issue 4.2
+ (``XPG4.2'').
+
+HISTORY
+ The socketpair() function call appeared in 4.2BSD.
+
+BSD June 4, 1993 BSD
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