Xinu7/src/serve11/sys/dgalloc.c

/* dgalloc.c - dgalloc */

#include <conf.h>
#include <kernel.h>
#include <network.h>

/*------------------------------------------------------------------------
 *  dgalloc  -  allocate a datagram psuedo device and return descriptor
 *------------------------------------------------------------------------
 */
dgalloc()
{
	struct	dgblk	*dgptr;
	int	i;
	char	ps;

	disable(ps);
	for (i=0 ; i<Ndg ; i++) {
		dgptr = &dgtab[i];
		if (dgptr->dg_state == DG_FREE) {
			dgptr->dg_state = DG_USED;
			restore(ps);
			return(i);
		}
	}
	restore(ps);
	return(SYSERR);
}