mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 13:30:06 +00:00
107 lines
3.1 KiB
C
107 lines
3.1 KiB
C
/* Copyright (C) 1994-2023 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <stddef.h>
|
|
#include <errno.h>
|
|
#include <sys/time.h>
|
|
#include <hurd.h>
|
|
#include <mach.h>
|
|
|
|
/* XXX Temporary cheezoid implementation; see setitimer.c. */
|
|
|
|
/* These are defined in __setitmr.c. */
|
|
extern spin_lock_t _hurd_itimer_lock;
|
|
extern struct itimerval _hurd_itimerval;
|
|
extern struct timeval _hurd_itimer_started;
|
|
|
|
static inline void
|
|
subtract_timeval (struct timeval *from, const struct timeval *subtract)
|
|
{
|
|
from->tv_usec -= subtract->tv_usec;
|
|
from->tv_sec -= subtract->tv_sec;
|
|
while (from->tv_usec < 0)
|
|
{
|
|
--from->tv_sec;
|
|
from->tv_usec += 1000000;
|
|
}
|
|
}
|
|
|
|
/* Set *VALUE to the current setting of timer WHICH.
|
|
Return 0 on success, -1 on errors. */
|
|
int
|
|
__getitimer (enum __itimer_which which, struct itimerval *value)
|
|
{
|
|
struct itimerval val;
|
|
struct timeval elapsed;
|
|
|
|
switch (which)
|
|
{
|
|
default:
|
|
return __hurd_fail (EINVAL);
|
|
|
|
case ITIMER_VIRTUAL:
|
|
case ITIMER_PROF:
|
|
return __hurd_fail (ENOSYS);
|
|
|
|
case ITIMER_REAL:
|
|
break;
|
|
}
|
|
|
|
/* Get the time now. */
|
|
{
|
|
time_value_t tv;
|
|
__host_get_time (__mach_host_self (), &tv);
|
|
elapsed.tv_sec = tv.seconds;
|
|
elapsed.tv_usec = tv.microseconds;
|
|
}
|
|
|
|
/* Extract the current timer setting; and the time it was set, so we can
|
|
calculate the time elapsed so far. */
|
|
HURD_CRITICAL_BEGIN;
|
|
__spin_lock (&_hurd_itimer_lock);
|
|
val = _hurd_itimerval;
|
|
subtract_timeval (&elapsed, &_hurd_itimer_started);
|
|
__spin_unlock (&_hurd_itimer_lock);
|
|
HURD_CRITICAL_END;
|
|
|
|
if ((val.it_value.tv_sec | val.it_value.tv_usec) != 0)
|
|
{
|
|
/* There is a pending alarm set. VAL indicates the interval it was
|
|
set for, relative to the time recorded in _hurd_itimer_started.
|
|
Now compensate for the time elapsed since to get the user's
|
|
conception of the current value of the timer (as if the value
|
|
stored decreased every microsecond). */
|
|
if (timercmp (&val.it_value, &elapsed, <))
|
|
{
|
|
/* Hmm. The timer should have just gone off, but has not been
|
|
reset. This is a possible timing glitch. The alarm will signal
|
|
soon, so fabricate a value for how soon. */
|
|
val.it_value.tv_sec = 0;
|
|
val.it_value.tv_usec = 10; /* Random. */
|
|
}
|
|
else
|
|
/* Subtract the time elapsed since the timer was set
|
|
from the current timer value the user sees. */
|
|
subtract_timeval (&val.it_value, &elapsed);
|
|
}
|
|
|
|
*value = val;
|
|
return 0;
|
|
}
|
|
|
|
weak_alias (__getitimer, getitimer)
|