117 lines
3.3 KiB
C
117 lines
3.3 KiB
C
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/* clock_nanosleep - high-resolution sleep with specifiable clock.
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Copyright (C) 2002-2022 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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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <mach.h>
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#include <time.h>
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#include <unistd.h>
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#include <posix-timer.h>
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#include <shlib-compat.h>
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#include <sysdep-cancel.h>
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static int
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nanosleep_call (const struct timespec *req, struct timespec *rem)
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{
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mach_port_t recv;
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struct timespec before;
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error_t err;
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const mach_msg_timeout_t ms
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= req->tv_sec * 1000
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+ (req->tv_nsec + 999999) / 1000000;
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recv = __mach_reply_port ();
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if (rem != NULL)
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__clock_gettime (CLOCK_REALTIME, &before);
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int cancel_oldtype = LIBC_CANCEL_ASYNC();
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err = __mach_msg (NULL, MACH_RCV_MSG|MACH_RCV_TIMEOUT|MACH_RCV_INTERRUPT,
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0, 0, recv, ms, MACH_PORT_NULL);
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LIBC_CANCEL_RESET (cancel_oldtype);
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__mach_port_destroy (mach_task_self (), recv);
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if (err == EMACH_RCV_INTERRUPTED)
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{
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if (rem != NULL)
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{
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struct timespec after, elapsed;
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__clock_gettime (CLOCK_REALTIME, &after);
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timespec_sub (&elapsed, &after, &before);
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timespec_sub (rem, req, &elapsed);
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}
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return EINTR;
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}
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return 0;
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}
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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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if (clock_id != CLOCK_REALTIME
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|| !valid_nanoseconds (req->tv_nsec)
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|| (flags != 0 && flags != TIMER_ABSTIME))
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return EINVAL;
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struct timespec now;
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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 (__clock_gettime (clock_id, &now) != 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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return nanosleep_call (req, rem);
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}
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libc_hidden_def (__clock_nanosleep)
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versioned_symbol (libc, __clock_nanosleep, clock_nanosleep, GLIBC_2_17);
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/* clock_nanosleep moved to libc in version 2.17;
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old binaries may expect the symbol version it had in librt. */
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#if SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_17)
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strong_alias (__clock_nanosleep, __clock_nanosleep_2);
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compat_symbol (libc, __clock_nanosleep_2, clock_nanosleep, GLIBC_2_2);
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#endif
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