socketpair - phpMan

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 appropri-
       ately.

ERRORS
       EAFNOSUPPORT
              The specified address family is not supported on this machine.

       EFAULT The address sv does not specify a valid part of the process address space.

       EMFILE Too many descriptors are in use by this process.

       ENFILE The system limit on the total number of open files has been reached.

       EOPNOTSUPP
              The specified protocol does not support creation of socket pairs.

       EPROTONOSUPPORT
              The specified protocol is not supported on this machine.

CONFORMING TO
       4.4BSD,  POSIX.1-2001.   The  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).

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



Linux 2.6.7                       2004-06-17                     SOCKETPAIR(2)

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