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/* wrapclock.cc provides access to time related system calls.
Copyright (C) 2009-2022 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
This file is part of GNU Modula-2.
GNU Modula-2 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 3, or (at your option)
any later version.
GNU Modula-2 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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include <m2rts.h>
#define EXPORT(FUNC) m2iso ## _wrapclock_ ## FUNC
#define M2EXPORT(FUNC) m2iso ## _M2_wrapclock_ ## FUNC
#define M2LIBNAME "m2iso"
#if defined(HAVE_STDLIB_H)
#include "stdlib.h"
#endif
#if defined(HAVE_UNISTD_H)
#include "unistd.h"
#endif
#if defined(HAVE_SYS_TYPES_H)
#include "sys/types.h"
#endif
#if defined(HAVE_SYS_TIME_H)
#include "sys/time.h"
#endif
#if defined(HAVE_TIME_H)
#include "time.h"
#endif
#if defined(HAVE_MALLOC_H)
#include "malloc.h"
#endif
#if defined(HAVE_LIMITS_H)
#include "limits.h"
#endif
#if !defined(NULL)
#define NULL (void *)0
#endif
extern "C" long int
EXPORT(timezone) (void)
{
struct tm result;
struct timespec ts;
if (clock_gettime (CLOCK_REALTIME, &ts) == 0)
{
time_t time = ts.tv_sec;
localtime_r (&time, &result);
return result.tm_gmtoff;
}
else
return timezone;
}
extern "C" int
EXPORT(daylight) (void)
{
return daylight;
}
/* isdst returns 1 if daylight saving time is currently in effect and
returns 0 if it is not. */
extern "C" int
EXPORT(isdst) (void)
{
struct tm result;
struct timespec ts;
if (clock_gettime (CLOCK_REALTIME, &ts) == 0)
{
time_t time = ts.tv_sec;
localtime_r (&time, &result);
return result.tm_isdst;
}
else
return 0;
}
/* tzname returns the string associated with the local timezone.
The daylight value is 0 or 1. The value 0 returns the non
daylight saving timezone string and the value of 1 returns the
daylight saving timezone string. */
extern "C" char *
EXPORT(tzname) (int daylight)
{
return tzname[daylight];
}
/* GetTimeRealtime performs return gettime (CLOCK_REALTIME, ts).
gettime returns 0 on success and -1 on failure. If the underlying
system does not have gettime then GetTimeRealtime returns 1. */
extern "C" int
EXPORT(GetTimeRealtime) (struct timespec *ts)
{
#if defined(HAVE_CLOCK_GETTIME)
return clock_gettime (CLOCK_REALTIME, ts);
#else
return 1;
#endif
}
/* SetTimeRealtime performs return settime (CLOCK_REALTIME, ts).
gettime returns 0 on success and -1 on failure. If the underlying
system does not have gettime then GetTimeRealtime returns 1. */
extern "C" int
EXPORT(SetTimeRealtime) (struct timespec *ts)
{
#if defined(HAVE_CLOCK_GETTIME)
return clock_settime (CLOCK_REALTIME, ts);
#else
return 1;
#endif
}
/* InitTimespec returns a newly created opaque type. */
extern "C" struct timespec *
EXPORT(InitTimespec) (void)
{
return (struct timespec *)malloc (sizeof (struct timespec));
}
/* KillTimeval deallocates the memory associated with an opaque type. */
extern "C" struct timespec *
EXPORT(KillTimespec) (void *ts)
{
#if defined(HAVE_MALLOC_H)
free (ts);
#endif
return NULL;
}
/* GetTimespec retrieves the number of seconds and nanoseconds from the
timespec. */
extern "C" void
EXPORT(GetTimespec) (timespec *ts, unsigned long *sec, unsigned long *nano)
{
*sec = ts->tv_sec;
*nano = ts->tv_nsec;
}
/* SetTimespec sets the number of seconds and nanoseconds into timespec. */
extern "C" void
EXPORT(SetTimespec) (timespec *ts, unsigned long sec, unsigned long nano)
{
ts->tv_sec = sec;
ts->tv_nsec = nano;
}
/* init - init/finish functions for the module */
/* GNU Modula-2 linking hooks. */
extern "C" void
M2EXPORT(init) (int, char **, char **)
{
}
extern "C" void
M2EXPORT(fini) (int, char **, char **)
{
}
extern "C" void
M2EXPORT(dep) (void)
{
}
extern "C" void __attribute__((__constructor__))
M2EXPORT(ctor) (void)
{
m2iso_M2RTS_RegisterModule ("wrapclock", M2LIBNAME,
M2EXPORT(init), M2EXPORT(fini),
M2EXPORT(dep));
}
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