man/man9f/ldi_putmsg.9f

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 LDI_PUTMSG 9F "Jun 3, 2003"
 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
possible 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.