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RedHat 9 (Linux i386) - man page for socketpair (redhat section 2)

SOCKETPAIR(2)			    Linux Programmer's 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[2]);

DESCRIPTION
       The  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[0] and sv[1].  The two sockets are
       indistinguishable.

RETURN VALUE
       On success, zero is returned.  On error, -1 is returned, and errno is set appropriately.

ERRORS
       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.

CONFORMING TO
       4.4BSD (the socketpair function call appeared in 4.2BSD). Generally portable to/from  non-
       BSD systems supporting clones of the BSD socket layer (including System V variants).

NOTES
       On  Linux, the only supported domain for this call is AF_UNIX (or synonymously, AF_LOCAL).
       (Most implementations have the same restriction.)

SEE ALSO
       read(2), write(2), pipe(2), socket(2), unix(7)

BSD Man Page				    1993-07-24				    SOCKETPAIR(2)


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