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uxio.h
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1999-01-02
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/* -*-C-*-
$Id: uxio.h,v 1.5 1999/01/02 06:11:34 cph Exp $
Copyright (c) 1990-1999 Massachusetts Institute of Technology
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef SCM_UXIO_H
#define SCM_UXIO_H
#include "osio.h"
struct channel
{
int descriptor;
enum channel_type type;
unsigned int internal : 1;
unsigned int nonblocking : 1;
};
#define MARK_CHANNEL_CLOSED(channel) ((CHANNEL_DESCRIPTOR (channel)) = (-1))
#define CHANNEL_CLOSED_P(channel) ((CHANNEL_DESCRIPTOR (channel)) < 0)
#define CHANNEL_OPEN_P(channel) ((CHANNEL_DESCRIPTOR (channel)) >= 0)
#define CHANNEL_DESCRIPTOR(channel) ((channel_table [(channel)]) . descriptor)
#define CHANNEL_TYPE(channel) ((channel_table [(channel)]) . type)
#define CHANNEL_INTERNAL(channel) ((channel_table [(channel)]) . internal)
#define CHANNEL_NONBLOCKING(channel) \
((channel_table [(channel)]) . nonblocking)
#define MAKE_CHANNEL(descriptor, type, receiver) \
{ \
Tchannel MAKE_CHANNEL_temp = (channel_allocate ()); \
(CHANNEL_DESCRIPTOR (MAKE_CHANNEL_temp)) = (descriptor); \
(CHANNEL_TYPE (MAKE_CHANNEL_temp)) = (type); \
(CHANNEL_INTERNAL (MAKE_CHANNEL_temp)) = 0; \
(CHANNEL_NONBLOCKING (MAKE_CHANNEL_temp)) = 0; \
receiver (MAKE_CHANNEL_temp); \
}
extern struct channel * channel_table;
extern Tchannel EXFUN (channel_allocate, (void));
#endif /* SCM_UXIO_H */