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82 lines
2.5 KiB
C
82 lines
2.5 KiB
C
/* Copyright (C) 2003 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <time.h>
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#include <sysdep-cancel.h>
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#include "kernel-features.h"
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#ifdef __ASSUME_POSIX_TIMERS
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/* We can simply use the syscall. The CPU clocks are not supported
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with this function. */
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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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INTERNAL_SYSCALL_DECL (err);
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int r;
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if (SINGLE_THREAD_P)
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r = INTERNAL_SYSCALL (clock_nanosleep, err, 4, clock_id, flags, req, rem);
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else
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{
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int oldstate = LIBC_CANCEL_ASYNC ();
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r = INTERNAL_SYSCALL (clock_nanosleep, err, 4, clock_id, flags, req,
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rem);
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LIBC_CANCEL_RESET (oldstate);
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}
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return (INTERNAL_SYSCALL_ERROR_P (r, err)
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? INTERNAL_SYSCALL_ERRNO (r, err) : 0);
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}
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#else
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# ifdef __NR_clock_nanosleep
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/* Is the syscall known to exist? */
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extern int __libc_missing_posix_timers attribute_hidden;
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/* The REALTIME and MONOTONIC clock might be available. Try the
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syscall first. */
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# define SYSDEP_NANOSLEEP \
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if (!__libc_missing_posix_timers) \
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{ \
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INTERNAL_SYSCALL_DECL (err); \
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\
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int oldstate = LIBC_CANCEL_ASYNC (); \
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\
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int r = INTERNAL_SYSCALL (clock_nanosleep, err, 4, clock_id, flags, \
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req, rem); \
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\
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LIBC_CANCEL_RESET (oldstate); \
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\
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if (!INTERNAL_SYSCALL_ERROR_P (r, err)) \
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return 0; \
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\
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if (INTERNAL_SYSCALL_ERRNO (r, err) != ENOSYS) \
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return INTERNAL_SYSCALL_ERRNO (r, err); \
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\
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__libc_missing_posix_timers = 1; \
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}
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# endif
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# include <sysdeps/unix/clock_nanosleep.c>
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#endif
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