Return to msgcon.c CVS log

Up to [MW Coherent from dump] / coherent / b / kernel / io.386

coherent

/*
 * System V Compatible Message Device Driver
 *
 *	This device driver provides System V compatible messaging operations.
 *	Operations are performed through the message device (/dev/msg).
 *	and are implemented as ioctl calls from msgctl, msgget, msgsnd, msgrcv
 *	utilities.
 *
 *	Author: Allan Cornish.
 *
 */

#include <sys/coherent.h>
#include <sys/types.h>
#include <sys/uproc.h>
#include <errno.h>
#include <sys/con.h>
#include <sys/msg.h>
#ifndef _I386
#define getusd(arg)		getuwd(arg)
#define putusd(arg1, arg2)	putuwd(arg1, arg2)
#endif

/*
 * Functions.
 */

int msgopen();
int msgioctl();
int nulldev();
int nonedev();

/*
 * Device Configuration.
 */

CON msgcon = {
	DFCHR,			/* Flags			*/
	25,			/* Major Index			*/
	msgopen,		/* Open				*/
	nulldev,		/* Close			*/
	nonedev,		/* Block			*/
	nonedev,		/* Read				*/
	nonedev,		/* Write			*/
	msgioctl,		/* Ioctl			*/
	nulldev,		/* Power fail			*/
	nulldev,		/* Timeout			*/
	nulldev,		/* Load				*/
	nulldev			/* Unload			*/
};

/*
 * Message Device Open.
 */

static
msgopen( dev, mode )

dev_t dev;
int mode;

{
	extern struct msqid_ds * msqs; /* Pointer to array of message queues */


	if ( ! msqs ){			/* message queues not initialized */
		msginit();
	}

	if ( ! msqs )			/* no message queues */
		u.u_error = ENODEV;
}

/*
 * Message Device Ioctl.
 */

static
msgioctl( dev, com, vec )

dev_t dev;
short com;
register short *vec;

{
	switch ( com ) {

	case MSGCTL:
		putusd( vec+0,				/* -1 */
			umsgctl(getusd( vec+1 ),	/* msqid */
				getusd( vec+2 ), 	/* command */
				getusd( vec+3 ) ));	/* msqid_ds address */
		return;

	case MSGGET:
		putusd( vec+0,				/* -1 */
			umsgget(getusd( vec+1 ),	/* key 0 -15 */
/*				getusd( vec+2 ), 	   key 15 - 31 */
				getusd( vec+3 ) ));	/* msgflag */
		return;

	case MSGSND:
		putusd( vec+0,				/* -1 */
			umsgsnd(getusd( vec+1 ),	/* msqid */
				getusd( vec+2 ),	/* -> message text */
				getusd( vec+3 ),	/* size of text */
				getusd( vec+4 ) ));	/* flag */
		return;

	case MSGRCV:
		putusd( vec+0,				/* -1 */
			umsgrcv(getusd( vec+1 ),	/* msqid */
				getusd( vec+2 ),	/* -> message text */
				getusd( vec+3 ),	/* size of text */
				getusd( vec+4 ),	/* msgtype 0 - 15 */
/*				getusd( vec+5 ), 	   msgtype 16 - 31 */
				getusd( vec+6 ) ));	/* flag */
		return;

	default:
		u.u_error = EINVAL;
		return;
	}
}

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.