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/*-----------------------------------------------------------------*-C-*---
* File: handc/runtime/osglue.h
*
* Copyright (C)1997 Donovan Kolbly <d.kolbly@rscheme.org>
* as part of the RScheme project, licensed for free use.
* See <http://www.rscheme.org/> for the latest information.
*
* File version: 1.17
* File mod date: 1997.11.29 23:10:50
* System build: v0.7.2, 97.12.21
*
* Purpose: interface to standard OS/platform features
*------------------------------------------------------------------------*/
/*
* Interface to the minimal functionality
* expected from the OS for normal
* operation
*/
#ifndef _H_RSCHEME_OSGLUE
#define _H_RSCHEME_OSGLUE
#include <stdio.h>
#include <rscheme/obj.h>
#include <rscheme/intrs.h>
void init_os( void );
/* open a file
(path is in canonical form, so you can say
os_fopen("foo/bar"), and on a Mac get fopen(":foo:bar"))
*/
FILE *os_fopen( const char *path, const char *mode );
const char *os_getenv( const char *key );
/* a minimal implementation can return "./",
but see src/corelib/process.scm for caveats
*/
obj os_getwd( void );
/* change the current working directory,
or signal an error on failure
(pathname in canonical form)
*/
void os_setwd( const char *path );
/* return YES or NO accordingly as whether the named
file exists
(pathname in canonical form)
*/
rs_bool os_file_exists_p( const char *path );
/* create a directory
(part of base system so that compiler can be self-hosting)
*/
void os_mkdir( const char *path );
/* convert a canonical pathname to local OS format */
obj os_path( obj path );
/*
arrange for some interrupts...
*/
/*
* if `msec' is 0, then signal an RSSIG_TIMEOUT immediately
*/
void os_set_timer( UINT_32 msec );
UINT_32 os_get_time_remaining( void );
/*
* os_halt_timer() must ensure that an RSSIG_TIMEOUT is not
* queued. Usually, this only needs to be checked if
* it returns 0
*/
UINT_32 os_halt_timer( void );
/*
* sleep for up to `msec' milliseconds
* returns the amount of time actually slept
* (may be larger msec, if the true real time
* is available and happens to be larger, or may
* be less if the sleep was interrupted, as by
* a signal)
*/
UINT_32 os_sleep( UINT_32 msec );
#if !HAVE_SETITIMER
#ifndef TIMER_IS_MONOTONE_COUNTER
#define TIMER_IS_MONOTONE_COUNTER
#endif
#endif
#ifdef TIMER_IS_MONOTONE_COUNTER
extern UINT_32 system_timeout;
#endif
/*
return a list of symbols specifying the OS type
*/
obj os_type( void );
/*
* manage a bounded, ordered list of integers atomically,
* with a gate on rssig_ready
*/
/*
* this is YES if there is an RS signal waiting to be
* delivered via os_get_next_sig()
* (in particular, it is NO if signals are disabled even
* if there is something in the internal queue)
*/
extern rs_bool rssig_ready;
void os_enqueue_sig( struct RSSIG_info *sig );
/* used to scan sig queue during root traversal */
int os_scan_sig_queue( unsigned *index, obj *item );
/* use the `_from_handler' form when interrupts are already disabled */
void os_enqueue_sig_from_handler( struct RSSIG_info *sig );
/* registers an interrupt handler that will run with all
* interrupts disabled, and can make use of the `os_enqueue_sig_from_handler'
* function. Returns -1 if the signal is invalid
*/
int os_register_signal_handler( int sig, void (*proc)( int ) );
struct RSSIG_info os_get_next_sig( void ); /* disables rssig_ready */
rs_bool os_set_sigenable( rs_bool flag );
void set_sigqueue_size( int n );
/* signal an instance of <os-error>, capturing the current `errno' */
void os_error( const char *fn, int num_args, ... );
/* return a message describing the error */
obj os_errormsg( int error_num );
/* time manipulation functions */
struct RSTime os_current_time( void );
struct RSTime rstime_sub( struct RSTime a, struct RSTime b );
IEEE_64 rstime_to_sec( struct RSTime a );
#endif /* _H_RSCHEME_OSGLUE */
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