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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

       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,  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.)

       The header file <sys/types.h> is only required for  libc4  or  earlier.
       Some packages, like util-linux, claim portability to all Linux versions
       and libraries.  They certainly need this header file.

SEE ALSO

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