getc.c,v

来自「TCP-IP红宝书源代码」· C,V 代码 · 共 45 行

head	1.1;
access;
symbols;
locks
	dls:1.1; strict;
comment	@ * @;


1.1
date	97.09.21.19.29.30;	author dls;	state Dist;
branches;
next	;


desc
@@


1.1
log
@pre-3e code
@
text
@/* getc.c - getc */

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

/*------------------------------------------------------------------------
 *  getc  -  get one character from a device
 *------------------------------------------------------------------------
 */
SYSCALL	getc(descrp)
int descrp;
{
	struct	devsw	*devptr;

	if (isbaddev(descrp) )
		return(SYSERR);
	devptr = &devtab[descrp];
        return( (*devptr->dvgetc)(devptr) );
}
@