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89fb683558
__clock_gettime and other __clock_* functions could result in an extra PLT reference within libc.so if it actually gets used. None of the code currently uses them, which is why this probably went unnoticed.
102 lines
2.9 KiB
C
102 lines
2.9 KiB
C
/* High-resolution sleep with the specified clock.
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Copyright (C) 2000-2013 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 <assert.h>
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#include <errno.h>
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#include <time.h>
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#include <hp-timing.h>
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#include <sysdep-cancel.h>
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#if HP_TIMING_AVAIL
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# define CPUCLOCK_P(clock) \
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((clock) == CLOCK_PROCESS_CPUTIME_ID \
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|| ((clock) & ((1 << CLOCK_IDFIELD_SIZE) - 1)) == CLOCK_THREAD_CPUTIME_ID)
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#else
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# define CPUCLOCK_P(clock) 0
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#endif
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#ifndef INVALID_CLOCK_P
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# define INVALID_CLOCK_P(cl) \
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((cl) < CLOCK_REALTIME || (cl) > CLOCK_THREAD_CPUTIME_ID)
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#endif
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/* This implementation assumes that these is only a `nanosleep' system
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call. So we have to remap all other activities. */
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int
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__clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req,
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struct timespec *rem)
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{
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struct timespec now;
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if (__builtin_expect (req->tv_nsec, 0) < 0
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|| __builtin_expect (req->tv_nsec, 0) >= 1000000000)
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return EINVAL;
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if (clock_id == CLOCK_THREAD_CPUTIME_ID)
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return EINVAL; /* POSIX specifies EINVAL for this case. */
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#ifdef SYSDEP_NANOSLEEP
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SYSDEP_NANOSLEEP;
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#endif
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if (CPUCLOCK_P (clock_id))
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return ENOTSUP;
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if (INVALID_CLOCK_P (clock_id))
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return EINVAL;
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/* If we got an absolute time, remap it. */
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if (flags == TIMER_ABSTIME)
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{
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long int nsec;
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long int sec;
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/* Make sure we use safe data types. */
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assert (sizeof (sec) >= sizeof (now.tv_sec));
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/* Get the current time for this clock. */
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if (__builtin_expect (clock_gettime (clock_id, &now), 0) != 0)
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return errno;
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/* Compute the difference. */
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nsec = req->tv_nsec - now.tv_nsec;
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sec = req->tv_sec - now.tv_sec - (nsec < 0);
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if (sec < 0)
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/* The time has already elapsed. */
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return 0;
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now.tv_sec = sec;
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now.tv_nsec = nsec + (nsec < 0 ? 1000000000 : 0);
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/* From now on this is our time. */
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req = &now;
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/* Make sure we are not modifying the struct pointed to by REM. */
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rem = NULL;
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}
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else if (__builtin_expect (flags, 0) != 0)
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return EINVAL;
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else if (clock_id != CLOCK_REALTIME)
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/* Not supported. */
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return ENOTSUP;
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return __builtin_expect (nanosleep (req, rem), 0) ? errno : 0;
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}
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weak_alias (__clock_nanosleep, clock_nanosleep)
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