mcopyout(9f) [opensolaris man page]

mcopyout(9F)						   Kernel Functions for Drivers 					      mcopyout(9F)

NAME

       mcopyout - Convert an M_IOCTL or M_IOCDATA message to an M_COPYOUT

SYNOPSIS

       #include <sys/stream.h>
       #include <sys/strsun.h>

       void mcopyout(mblk_t *mp, void *private, size_t size, void *useraddr,
	     mblk_t *dp);

INTERFACE LEVEL

       Solaris DDI specific (Solaris DDI).

PARAMETERS

       mp	   M_IOCTL or M_IOCDATA message.

       private	   Value to set the cq_private field of the copyreq(9S) to.

       size	   Value to set the cq_size field of the copyreq(9S) to.

       useraddr    Optionally, the value to set the cq_addr field of the copyreq(9S) to.

       dp	   Optionally, the payload to copy out.

DESCRIPTION

       The mcopyout() function converts an M_IOCTL or M_IOCDATA message into an M_COPYOUT message using the supplied arguments.

       To  convert  the  message,  mcopyout() changes the message type to M_COPYOUT, and its payload from a iocblk(9S) to a copyreq(9S). Since the
       iocblk(9S) and copyreq(9S) are designed to overlay one another, the only fields which must be updated are cq_private, cq_size, and cq_addr,
       which  are  set to the supplied values. If useraddr is passed as NULL, the M_IOCTL must be transparent and cq_addr is assigned the pointer-
       sized quantity found at mp->b_cont->b_rptr.

       If dp is not NULL, any trailing message blocks associated with mp are freed, mp->b_cont is reset to dp and dp->b_wptr is set to	dp->b_rptr
       + size. Otherwise, any trailing message blocks are unaffected.

RETURN VALUES

       None.

CONTEXT

       This function can be called from user, kernel or interrupt context.

SEE ALSO

       mcopyin(9F), copyreq(9S), iocblk(9S)

       STREAMS Programming Guide

SunOS 5.11							    9 June 2004 						      mcopyout(9F)

rmvb(9F)						   Kernel Functions for Drivers 						  rmvb(9F)

NAME

       rmvb - remove a message block from a message

SYNOPSIS

       #include <sys/stream.h>

       mblk_t *rmvb(mblk_t *mp, mblk_t *bp);

INTERFACE LEVEL

       Architecture independent level 1 (DDI/DKI).

PARAMETERS

       mp	Message from which a block is to be removed. mblk_t is an instance of the
		 msgb(9S) structure.

       bp	Message block to be removed.

DESCRIPTION

       rmvb()  removes	a  message  block  (bp) from a message (mp), and returns a pointer to the altered message. The message block is not freed,
       merely removed from the message. It is the module or driver's responsibility to free the message block.

RETURN VALUES

       If successful, a pointer to the message (minus the removed block) is returned. The pointer is  NULL if bp was the only block of the message
       before
	rmvb() was called. If the designated message block (bp) does not exist, -1 is returned.

CONTEXT

       rmvb() can be called from user or interrupt context.

EXAMPLES

       This  routine  removes  all zero-length M_DATA message blocks from the given message.  For each message block in the message, save the next
       message block (line 10). If the current message block is of type M_DATA and has no data in its buffer (line 11), then remove  it  from  the
       message (line 12) and free it (line 13). In either case, continue with the next message block in the message (line 16).

	1  void
	2  xxclean(mp)
	3      mblk_t *mp;
	4  {
	5	   mblk_t *tmp;
	6	   mblk_t *nmp;
	7
	8	   tmp = mp;
	9	   while (tmp) {
       10		    nmp = tmp->b_cont;
       11		    if ((tmp->b_datap->db_type == M_DATA) &&
				  (tmp->b_rptr == tmp->b_wptr)) {
       12			 (void) rmvb(mp, tmp);
       13			 freeb(tmp);
       14		    }
       15		    tmp = nmp;
       16	   }
       17  }

SEE ALSO

       freeb(9F), msgb(9S)

       Writing Device Drivers

       STREAMS Programming Guide

SunOS 5.10							    11 Apr 1991 							  rmvb(9F)