| /* Copyright (C) 2008 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, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #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)) |
| { |
| /* 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 BUF |
| pointer. */ |
| #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. 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) |
