diff options
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/unix/sysv/linux/times.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/times.c b/sysdeps/unix/sysv/linux/times.c new file mode 100644 index 0000000000..2759683b0b --- /dev/null +++ b/sysdeps/unix/sysv/linux/times.c @@ -0,0 +1,54 @@ +/* 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 ret; +} +weak_alias (__times, times) |