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- /* Copyright (C) 2003, 2004, 2005 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
- <http://www.gnu.org/licenses/>. */
- #include <time.h>
- #include <errno.h>
- #include <sysdep-cancel.h>
- #include <bits/kernel-features.h>
- #include "kernel-posix-cpu-timers.h"
- #ifdef __ASSUME_POSIX_TIMERS
- /* We can simply use the syscall. The CPU clocks are not supported
- with this function. */
- int
- clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req,
- struct timespec *rem)
- {
- INTERNAL_SYSCALL_DECL (err);
- int r;
- if (clock_id == CLOCK_THREAD_CPUTIME_ID)
- return EINVAL;
- if (clock_id == CLOCK_PROCESS_CPUTIME_ID)
- clock_id = MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED);
- if (SINGLE_THREAD_P)
- r = INTERNAL_SYSCALL (clock_nanosleep, err, 4, clock_id, flags, req, rem);
- else
- {
- int oldstate = LIBC_CANCEL_ASYNC ();
- r = INTERNAL_SYSCALL (clock_nanosleep, err, 4, clock_id, flags, req,
- rem);
- LIBC_CANCEL_RESET (oldstate);
- }
- return (INTERNAL_SYSCALL_ERROR_P (r, err)
- ? INTERNAL_SYSCALL_ERRNO (r, err) : 0);
- }
- #else
- # ifdef __NR_clock_nanosleep
- /* Is the syscall known to exist? */
- extern int __libc_missing_posix_timers attribute_hidden;
- /* The REALTIME and MONOTONIC clock might be available. Try the
- syscall first. */
- # define SYSDEP_NANOSLEEP \
- if (!__libc_missing_posix_timers) \
- { \
- clockid_t syscall_clockid; \
- INTERNAL_SYSCALL_DECL (err); \
- \
- if (clock_id == CLOCK_THREAD_CPUTIME_ID) \
- return EINVAL; \
- if (clock_id == CLOCK_PROCESS_CPUTIME_ID) \
- syscall_clockid = MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED); \
- else \
- syscall_clockid = clock_id; \
- \
- int oldstate = LIBC_CANCEL_ASYNC (); \
- \
- int r = INTERNAL_SYSCALL (clock_nanosleep, err, 4, \
- syscall_clockid, flags, req, rem); \
- \
- LIBC_CANCEL_RESET (oldstate); \
- \
- if (!INTERNAL_SYSCALL_ERROR_P (r, err)) \
- return 0; \
- \
- if (INTERNAL_SYSCALL_ERRNO (r, err) != ENOSYS) \
- return INTERNAL_SYSCALL_ERRNO (r, err); \
- \
- __libc_missing_posix_timers = 1; \
- }
- # endif
- # include <sysdeps/unix/clock_nanosleep.c>
- #endif
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