minix/lib/libsys/sys_in.c

21 lines
612 B
C

#include "syslib.h"
/*===========================================================================*
* sys_in *
*===========================================================================*/
PUBLIC int sys_in(port, value, type)
int port; /* port address to read from */
unsigned long *value; /* pointer where to store value */
int type; /* byte, word, long */
{
message m_io;
int result;
m_io.DIO_REQUEST = _DIO_INPUT | type;
m_io.DIO_PORT = port;
result = _kernel_call(SYS_DEVIO, &m_io);
*value = m_io.DIO_VALUE;
return(result);
}