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FreeBSD 11.0 - man page for socketpair (freebsd section 2)

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SOCKETPAIR(2)			     BSD System Calls Manual			    SOCKETPAIR(2)

NAME
     socketpair -- create a pair of connected sockets

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <sys/types.h>
     #include <sys/socket.h>

     int
     socketpair(int fd, int type, int protocol, int *sv);

DESCRIPTION
     The socketpair() system call creates an unnamed pair of connected sockets in the specified
     domain fd, of the specified type, and using the optionally specified protocol.  The descrip-
     tors used in referencing the new sockets are returned in sv[0] and sv[1].	The two sockets
     are indistinguishable.

     The SOCK_CLOEXEC and SOCK_NONBLOCK flags in the type argument apply to both descriptors.

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:

     [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.

SEE ALSO
     pipe(2), read(2), socket(2), write(2)

HISTORY
     The socketpair() system call appeared in 4.2BSD.

BUGS
     This call is currently implemented only for the UNIX domain.

BSD					September 11, 2013				      BSD
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