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61 lines
2.1 KiB
C
61 lines
2.1 KiB
C
/* Copyright (C) 2008-2016 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 <errno.h>
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#include <sys/times.h>
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#include <sysdep.h>
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clock_t
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__times (struct tms *buf)
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{
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INTERNAL_SYSCALL_DECL (err);
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clock_t ret = INTERNAL_SYSCALL (times, err, 1, buf);
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if (INTERNAL_SYSCALL_ERROR_P (ret, err)
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&& __builtin_expect (INTERNAL_SYSCALL_ERRNO (ret, err) == EFAULT, 0)
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&& buf)
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{
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/* This might be an error or not. For architectures which have
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no separate return value and error indicators we cannot
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distinguish a return value of -1 from an error. Do it the
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hard way. We crash applications which pass in an invalid
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non-NULL BUF pointer. Linux allows BUF to be NULL. */
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#define touch(v) \
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do { \
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clock_t temp = v; \
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asm volatile ("" : "+r" (temp)); \
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v = temp; \
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} while (0)
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touch (buf->tms_utime);
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touch (buf->tms_stime);
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touch (buf->tms_cutime);
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touch (buf->tms_cstime);
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/* If we come here the memory is valid (or BUF is NULL, which is
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a valid condition for the kernel syscall) and the kernel did not
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return an EFAULT error. Return the value given by the kernel. */
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}
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/* Return value (clock_t) -1 signals an error, but if there wasn't any,
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return the following value. */
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if (ret == (clock_t) -1)
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return (clock_t) 0;
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return ret;
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}
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weak_alias (__times, times)
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