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ldi_getmsg(9f) [opensolaris man page]

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

NAME

       ldi_putmsg, ldi_getmsg - Read/write message blocks from/to a stream

SYNOPSIS

       #include <sys/sunldi.h>

       int ldi_putmsg(ldi_handle_t lh, mblk_t *smp);

       int  ldi_getmsg(ldi_handle_t lh, mblk_t **rmp, timestruc_t *timeo);

PARAMETERS

       lh	 Layered handle.

       smp	 Message block to send.

       rmp	 Message block to receive.

       timeo	 Optional timeout for data reception.

DESCRIPTION

       The  ldi_putmsg	function  allows a caller to send a message block to a streams device specified by the layered handle lh. Once the message
       (smp) has been passed to ldi_putmsg(), the caller must not free the message even if an error occurs.

       The ldi_getmsg() function allows a caller to receive a message block from a streams device specified by the layered handle lh. Callers must
       free the message received with freemsg(9F).

       If a NULL timeout value is specified when the caller receives a message, the caller sleeps until a message is received.

RETURN VALUES

       The ldi_putmsg() and ldi_getmsg() functions return 0 upon success. If a failure occurs before the request is passed to the device, the pos-
       sible return values are shown below. Otherwise any other error number may be returned by the device.

       EINVAL	  Invalid input parameters.

       ENOTSUP	  Operation is not supported for this device.

		  The ldi_getmsg() function may also return:

		  ETIME    Returned if the timeout timeo expires with no messages received.

CONTEXT

       These functions may be called from user or kernel context.

SunOS 5.11							    3 June 2003 						    ldi_putmsg(9F)

Check Out this Related Man Page

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

NAME

       ldi_read, ldi_write - Read and write from a device

SYNOPSIS

       #include <sys/sunldi.h>

       int ldi_read(ldi_handle_t lh, struct uio *uiop, cred_t *cr);

       int  ldi_write(ldi_handle_t lh, struct uio *uiop, cred_t *cr);

PARAMETERS

       lh	       Layered handle.

       cr	       Pointer to a credential structure used to open a device.

       uiop	       Pointer to the uio(9S) structure. uio(9S) specifies  the location of the read or write data.  (Either userland or kernel.)

DESCRIPTION

       The  ldi_read()	function passes a read request to the device entry point for the device specified by the layered handle. This operation is
       supported  for  block,  character, and streams devices.

       The ldi_write() function passes a write request to the device entry  point for a device specified by the layered handle. This operation	is
       supported for block,  character, and streams devices.

RETURN VALUES

       The  ldi_read() and ldi_write() functions return 0 upon success. If  a  failure occurs before the request is passed to the device, the pos-
       sible return values are shown below. Otherwise any other error number may be returned by the device.

       EINVAL	       Invalid input parameters.

       ENOTSUP	       Operation is not supported for this device.

CONTEXT

       These functions may be called from user or kernel context.

SunOS 5.10							    3 June 2003 						      ldi_read(9F)
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