connld(7m) [opensolaris man page]

connld(7M)							  STREAMS Modules							connld(7M)

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   fat-
       tach(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

SunOS 5.11							    3 May 2004								connld(7M)

getpeerucred(3C)					   Standard C Library Functions 					  getpeerucred(3C)

NAME

       getpeerucred - get connected socket/STREAM peer's credentials

SYNOPSIS

       #include <ucred.h>

       int getpeerucred(int fd, ucred_t **ucred);

DESCRIPTION

       The  getpeerucred() function returns the credentials of the peer endpoint of a connection-oriented socket (SOCK_STREAM) or STREAM fd at the
       time the endpoint was created or the connection was established.  A process that initiates a connection retrieves the  credentials  of  its
       peer  at the time the peer's endpoint was created. A process that listens for connections retrieves the credentials of the peer at the time
       the peer initiated the connection.

       When successful, getpeerucred() stores the pointer to a freshly allocated ucred_t in the memory location pointed to by the  ucred  argument
       if that memory location contains the null pointer. If the memory location is non-null, it will reuse the existing ucred_t.

       When ucred is no longer needed, a credential allocated by getpeerucred() should be freed with ucred_free(3C).

       It is possible that all fields of the ucred_t are not available to for all peer endpoints and all callers.

RETURN VALUES

       Upon successful completion, getpeerucred() returns 0. Otherwise, it returns -1 and errno is set to indicate the error.

ERRORS

       The getpeerucred() function will fail if:

       EAGAIN	       There  is  not  enough  memory available to allocate sufficient memory to hold the user credential. The application can try
		       again later.

       EBADF	       The fd argument is not a valid file descriptor.

       EFAULT	       The pointer location pointed to by the ucred_t ** argument points to an invalid, non-null address.

       EINVAL	       The socket is connected but the peer credentials are unknown.

       ENOMEM	       The physical limits of the system are exceeded by the memory allocation needed to hold the user credential.

       ENOTCONN        The socket or STREAM is not connected or the STREAM's peer is unknown.

       ENOTSUP	       This operation is not supported on this file descriptor.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       door_ucred(3DOOR), ucred_get(3C), attributes(5), connld(7M)

NOTES

       The system currently supports both sides of connection endpoints for local AF_UNIX, AF_INET, and AF_INET6 sockets,  /dev/tcp,  /dev/ticots,
       and  /dev/ticotsord  XTI/TLI  connections,  and	pipe file descriptors sent using I_SENDFD as a result of the open of a named pipe with the
       "connld" module pushed.

SunOS 5.10							    26 May 2004 						  getpeerucred(3C)