setdev.c

来自「TCP-IP红宝书源代码」· C语言 代码 · 共 24 行

/* setdev.c - setdev */

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

/*------------------------------------------------------------------------
 *  setdev  -  set the two device entries in the process table entry
 *------------------------------------------------------------------------
 */
SYSCALL	setdev(pid, dev1, dev2)
int	pid;				/* process to change		*/
int	dev1, dev2;			/* device descriptors to set	*/
{
	short	*nxtdev;

	if (isbadpid(pid))
		return(SYSERR);
	nxtdev = (short *) proctab[pid].pdevs;
	*nxtdev++ = dev1;
	*nxtdev = dev2;
	return(OK);
}