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102 lines
3.0 KiB
C
102 lines
3.0 KiB
C
/* Copyright (C) 1994-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <stddef.h>
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#include <errno.h>
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#include <sys/time.h>
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#include <hurd.h>
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/* XXX Temporary cheezoid implementation; see __setitmr.c. */
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/* These are defined in __setitmr.c. */
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extern spin_lock_t _hurd_itimer_lock;
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extern struct itimerval _hurd_itimerval;
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extern struct timeval _hurd_itimer_started;
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static inline void
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subtract_timeval (struct timeval *from, const struct timeval *subtract)
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{
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from->tv_usec -= subtract->tv_usec;
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from->tv_sec -= subtract->tv_sec;
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while (from->tv_usec < 0)
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{
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--from->tv_sec;
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from->tv_usec += 1000000;
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}
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}
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/* Set *VALUE to the current setting of timer WHICH.
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Return 0 on success, -1 on errors. */
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int
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__getitimer (enum __itimer_which which, struct itimerval *value)
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{
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struct itimerval val;
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struct timeval elapsed;
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switch (which)
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{
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default:
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return __hurd_fail (EINVAL);
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case ITIMER_VIRTUAL:
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case ITIMER_PROF:
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return __hurd_fail (ENOSYS);
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case ITIMER_REAL:
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break;
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}
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/* Get the time now. */
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if (__gettimeofday (&elapsed, NULL) < 0)
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return -1;
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/* Extract the current timer setting; and the time it was set, so we can
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calculate the time elapsed so far. */
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HURD_CRITICAL_BEGIN;
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__spin_lock (&_hurd_itimer_lock);
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val = _hurd_itimerval;
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subtract_timeval (&elapsed, &_hurd_itimer_started);
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__spin_unlock (&_hurd_itimer_lock);
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HURD_CRITICAL_END;
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if ((val.it_value.tv_sec | val.it_value.tv_usec) != 0)
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{
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/* There is a pending alarm set. VAL indicates the interval it was
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set for, relative to the time recorded in _hurd_itimer_started.
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Now compensate for the time elapsed since to get the user's
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conception of the current value of the timer (as if the value
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stored decreased every microsecond). */
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if (timercmp (&val.it_value, &elapsed, <))
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{
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/* Hmm. The timer should have just gone off, but has not been
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reset. This is a possible timing glitch. The alarm will signal
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soon, so fabricate a value for how soon. */
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val.it_value.tv_sec = 0;
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val.it_value.tv_usec = 10; /* Random. */
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}
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else
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/* Subtract the time elapsed since the timer was set
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from the current timer value the user sees. */
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subtract_timeval (&val.it_value, &elapsed);
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}
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*value = val;
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return 0;
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}
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weak_alias (__getitimer, getitimer)
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