Permalink
Cannot retrieve contributors at this time
Name already in use
A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
glibc/sysdeps/unix/sysv/linux/times.c
Go to fileThis commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
60 lines (51 sloc)
2.08 KB
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* Copyright (C) 2008-2016 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) |