getmcr.c

来自「主要是异步通讯编程」· C语言 代码 · 共 16 行

/* A module of ASYNCx.LIB version 1.02 */

#include <dos.h>
#include "asyncdef.h"

/**************************************************************
 Return the value of the Modem Control Register. If the port is
 not open, return -1.
 **************************************************************/

int a_getmcr(ASYNC *p)
{if (p)
   return(inportb(p->base+MCR) & 0x1f);
 return -1;
} /* end of a_getmcr(p) */