diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/times.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/times.c | 67 |
1 files changed, 0 insertions, 67 deletions
diff --git a/sysdeps/unix/sysv/linux/times.c b/sysdeps/unix/sysv/linux/times.c deleted file mode 100644 index 63c8bf8ff0..0000000000 --- a/sysdeps/unix/sysv/linux/times.c +++ /dev/null @@ -1,67 +0,0 @@ -/* Copyright (C) 2008-2017 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 e.g. (clock_t) -14 from -EFAULT. - Therefore the only course of action is to dereference the user - -supplied structure on a return of (clock_t) -14. This will crash - applications which pass in an invalid non-NULL BUF pointer. - Note that Linux allows BUF to be NULL in which case we skip this. */ -#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 and the kernel did not - return an EFAULT error, but rather e.g. (clock_t) -14. - Return the value given by the kernel. */ - } - - /* On Linux this function never fails except with EFAULT. - POSIX says that returning a value (clock_t) -1 indicates an error, - but on Linux this is simply one of the valid clock values after - clock_t wraps. Therefore when we would return (clock_t) -1, we - instead return (clock_t) 0, and loose a tick of accuracy (having - returned 0 for two consecutive calls even though the clock - advanced). */ - if (ret == (clock_t) -1) - return (clock_t) 0; - - return ret; -} -weak_alias (__times, times) |