mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-29 22:11:18 +00:00
61 lines
2.1 KiB
C
61 lines
2.1 KiB
C
/* Copyright (C) 2008-2014 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 <errno.h>
|
|
#include <sys/times.h>
|
|
#include <sysdep.h>
|
|
|
|
|
|
clock_t
|
|
__times (struct tms *buf)
|
|
{
|
|
INTERNAL_SYSCALL_DECL (err);
|
|
clock_t ret = INTERNAL_SYSCALL (times, err, 1, buf);
|
|
if (INTERNAL_SYSCALL_ERROR_P (ret, err)
|
|
&& __builtin_expect (INTERNAL_SYSCALL_ERRNO (ret, err) == EFAULT, 0)
|
|
&& buf)
|
|
{
|
|
/* This might be an error or not. For architectures which have
|
|
no separate return value and error indicators we cannot
|
|
distinguish a return value of -1 from an error. Do it the
|
|
hard way. We crash applications which pass in an invalid
|
|
non-NULL BUF pointer. Linux allows BUF to be NULL. */
|
|
#define touch(v) \
|
|
do { \
|
|
clock_t temp = v; \
|
|
asm volatile ("" : "+r" (temp)); \
|
|
v = temp; \
|
|
} while (0)
|
|
touch (buf->tms_utime);
|
|
touch (buf->tms_stime);
|
|
touch (buf->tms_cutime);
|
|
touch (buf->tms_cstime);
|
|
|
|
/* If we come here the memory is valid (or BUF is NULL, which is
|
|
a valid condition for the kernel syscall) and the kernel did not
|
|
return an EFAULT error. Return the value given by the kernel. */
|
|
}
|
|
|
|
/* Return value (clock_t) -1 signals an error, but if there wasn't any,
|
|
return the following value. */
|
|
if (ret == (clock_t) -1)
|
|
return (clock_t) 0;
|
|
|
|
return ret;
|
|
}
|
|
weak_alias (__times, times)
|