Content-type: text/html Man page of connld

connld

Section: STREAMS Modules (7M)
Updated: 3 May 2004
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NAME

connld - line discipline for unique stream connections  

SYNOPSIS

#include </sys/steam.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(7I)) onto one end of a STREAMS-based
 pipe that may subsequently be attached to a name in the file system name space with  fattach(3C). After the pipe end is attached, a new pipe is created internally 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(7I)) 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 transmitted 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(7I)

STREAMS Programming Guide


 

Index

NAME
SYNOPSIS
DESCRIPTION
ERRORS
SEE ALSO

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Time: 02:38:40 GMT, October 02, 2010