1 /* Copyright (C) 2000, 2001, 2003, 2004, 2005 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
22 #include <sys/types.h>
23 #include <not-cancel.h>
25 static int itc_usable
;
30 if (__builtin_expect (itc_usable
== 0, 0))
33 int fd
= open_not_cancel_2 ("/proc/sal/itc_drift", O_RDONLY
);
34 if (__builtin_expect (fd
!= -1, 1))
37 /* We expect the file to contain a single digit followed by
38 a newline. If the format changes we better not rely on
40 if (read_not_cancel (fd
, buf
, sizeof buf
) != 2
41 || buf
[0] != '0' || buf
[1] != '\n')
44 close_not_cancel_no_status (fd
);