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connld(4m)

connld(4M)                      Streams Modules                     connld(4M)



NAME
       connld - line discipline for unique stream connections

SYNOPSIS
       #include <sys/stream.h>
       #include <sys/stropt.h>


       int ioctl(fd,I_PUSH,"connld");

DESCRIPTION
       connld  is  a  STREAMS-based  module  that  provides unique connections
       between server and  client  processes.  It  can  only  be  pushed  (see
       streamio(4I))  onto  one  end  of  a STREAMS-based pipe that may subse‐
       quently be attached to a name in the file system name space  with  fat‐
       tach(3C).  After the pipe end is attached, a new pipe is created inter‐
       nally when an originating process attempts to open(2) or  creat(2)  the
       file  system  name.  A  file  descriptor for one end of the new pipe is
       packaged into a message identical to that for the ioctl  I_SENDFD  (see
       streamio(4I)) and is transmitted along the stream to the server process
       on the other end. The originating process is blocked until  the  server
       responds.


       The  server  responds  to  the  I_SENDFD  request by accepting the file
       descriptor through the I_RECVFD ioctl message. When this  happens,  the
       file descriptor associated with the other end of the new pipe is trans‐
       mitted to the originating process as the file descriptor returned  from
       open(2) or creat(2).


       If the server does not respond to the I_SENDFD request, the stream that
       the connld module is pushed  on  becomes  uni-directional  because  the
       server  will  not be able to retrieve any data off the stream until the
       I_RECVFD request is issued. If the server process exits before  issuing
       the  I_RECVFD request, the open(2) or the creat(2) invocation will fail
       and return -1 to the originating process.


       When the connld module is pushed onto a pipe, it ignores messages going
       back and forth through the pipe.

ERRORS
       On  success,  an  open of connld returns 0. On failure, errno is set to
       the following values:

       EINVAL    A stream onto which connld is being pushed is not a  pipe  or
                 the  pipe  does  not have a write queue pointer pointing to a
                 stream head read queue.


       EINVAL    The other end of the pipe onto which connld is  being  pushed
                 is linked under a multiplexor.


       EPIPE     connld  is being pushed onto a pipe end whose other end is no
                 longer there.


       ENOMEM    An internal pipe could not be created.


       ENXIO     An M_HANGUP message is at the stream head of  the  pipe  onto
                 which connld is being pushed.


       EAGAIN    Internal data structures could not be allocated.


       ENFILE    A file table entry could not be allocated.


SEE ALSO
       creat(2), open(2), fattach(3C), streamio(4I)


       STREAMS Programming Guide



Oracle Solaris 11.4               18 Sep 2014                       connld(4M)
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