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author | Ulrich Drepper <drepper@redhat.com> | 2004-10-04 19:28:07 +0000 |
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committer | Ulrich Drepper <drepper@redhat.com> | 2004-10-04 19:28:07 +0000 |
commit | 94d824f920209243c72eb4a6fedbb5a039be2af3 (patch) | |
tree | bbd2b74f817b833d5b7e4c776927329bec5d353e /sysdeps/unix/sysv/linux/ia64/has_cpuclock.c | |
parent | 3078cba2f7272dab753c45b733af2e693e86d83c (diff) | |
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Update.
* sysdeps/unix/sysv/linux/ia64/sysconf.c: New file.
* sysdeps/unix/sysv/linux/ia64/Dist: Add has_cpuclock.c.
* sysdeps/unix/sysv/linux/ia64/clock_getcpuclockid.c: Move actual
testing code to...
* sysdeps/unix/sysv/linux/ia64/has_cpuclock.c: ...here. New file.
* sysdeps/unix/sysv/linux/i386/sysconf.c: Add dynamic check for
_SC_CPUTIME and _SC_THREAD_CPUTIME.
Diffstat (limited to 'sysdeps/unix/sysv/linux/ia64/has_cpuclock.c')
-rw-r--r-- | sysdeps/unix/sysv/linux/ia64/has_cpuclock.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/ia64/has_cpuclock.c b/sysdeps/unix/sysv/linux/ia64/has_cpuclock.c new file mode 100644 index 0000000000..ee19161272 --- /dev/null +++ b/sysdeps/unix/sysv/linux/ia64/has_cpuclock.c @@ -0,0 +1,52 @@ +/* Copyright (C) 2000, 2001, 2003, 2004 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 <fcntl.h> +#include <unistd.h> +#include <sys/stat.h> +#include <sys/types.h> + + +static int itc_usable; + +static int +has_cpuclock (void) +{ + if (__builtin_expect (itc_usable == 0, 0)) + { + int newval = 1; + int fd = open ("/proc/sal/itc_drift", O_RDONLY); + if (__builtin_expect (fd != -1, 1)) + { + char buf[16]; + /* We expect the file to contain a single digit followed by + a newline. If the format changes we better not rely on + the file content. */ + if (read (fd, buf, sizeof buf) != 2 || buf[0] != '0' + || buf[1] != '\n') + newval = -1; + + close (fd); + } + + itc_usable = newval; + } + + return itc_usable; +} |