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
       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, SUSv2, POSIX 1003.1-2001.  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
       read(2), write(2), pipe(2), socket(2), unix(7)



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

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