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Use clock_gettime to implement timespec_get.
timespec_get is the same function as clock_gettime, with an obnoxious coating of NIH painted on it by the ISO C committee. In addition to the rename, it takes its arguments in a different order, it returns 0 on *failure* or a positive number on *success*, and it requires that all of its TIME_* constants be positive. This last means we cannot directly reuse the existing CLOCK_* constants for it, because those have been allocated starting with CLOCK_REALTIME = 0 on all existing platforms. This patch simply promotes the sysdeps/posix implementation to universal, and removes the Linux-specific implementation, whose apparent reason for existing was to cut out one function call's worth of overhead. Checked on x86_64-linux-gnu, i686-linux-gnu, powerpc64le-linux-gnu, powerpc64-linux-gnu, powerpc-linux-gnu, and aarch64-linux-gnu. Reviewed-by: Lukasz Majewski <lukma@denx.de>
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/* timespec_get -- C11 interface to sample a clock. Generic POSIX.1 version.
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Copyright (C) 2013-2019 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 <time.h>
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/* Set TS to calendar time based in time base BASE. */
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int
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timespec_get (struct timespec *ts, int base)
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{
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if (base == TIME_UTC)
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{
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__clock_gettime (CLOCK_REALTIME, ts);
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return base;
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}
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return 0;
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}
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@ -1,46 +0,0 @@
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/* Copyright (C) 2011-2019 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.
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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 <time.h>
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#include <sysdep.h>
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#include <errno.h>
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#ifdef HAVE_CLOCK_GETTIME_VSYSCALL
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# define HAVE_VSYSCALL
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#endif
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#include <sysdep-vdso.h>
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/* Set TS to calendar time based in time base BASE. */
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int
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timespec_get (struct timespec *ts, int base)
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{
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switch (base)
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{
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int res;
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INTERNAL_SYSCALL_DECL (err);
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case TIME_UTC:
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res = INTERNAL_VSYSCALL (clock_gettime, err, 2, CLOCK_REALTIME, ts);
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if (INTERNAL_SYSCALL_ERROR_P (res, err))
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return 0;
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break;
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default:
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return 0;
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}
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return base;
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}
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@ -22,16 +22,10 @@
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int
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timespec_get (struct timespec *ts, int base)
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{
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switch (base)
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if (base == TIME_UTC)
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{
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case TIME_UTC:
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/* Not supported. */
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return 0;
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default:
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return 0;
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__clock_gettime (CLOCK_REALTIME, ts);
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return base;
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}
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return base;
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return 0;
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}
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stub_warning (timespec_get)
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