From 15f34685e7a9b5caf761af2ebf6afa20438d440b Mon Sep 17 00:00:00 2001
From: gcc <gcc@7b3dc134-2b1b-0410-93df-9e9f96275f8d>
Date: Thu, 17 Aug 2006 01:18:26 +0000
Subject: Import glibc-mainline for 2006-08-16

git-svn-id: svn://svn.eglibc.org/fsf/trunk@4 7b3dc134-2b1b-0410-93df-9e9f96275f8d
---
 libc/sysdeps/unix/sysv/linux/ia64/get_clockfreq.c | 89 +++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 libc/sysdeps/unix/sysv/linux/ia64/get_clockfreq.c

(limited to 'libc/sysdeps/unix/sysv/linux/ia64/get_clockfreq.c')

diff --git a/libc/sysdeps/unix/sysv/linux/ia64/get_clockfreq.c b/libc/sysdeps/unix/sysv/linux/ia64/get_clockfreq.c
new file mode 100644
index 000000000..48abfc13f
--- /dev/null
+++ b/libc/sysdeps/unix/sysv/linux/ia64/get_clockfreq.c
@@ -0,0 +1,89 @@
+/* Get frequency of the system processor.  IA-64/Linux version.
+   Copyright (C) 2001 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 <ctype.h>
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+#include <libc-internal.h>
+
+
+hp_timing_t
+__get_clockfreq (void)
+{
+  /* We read the information from the /proc filesystem.  It contains at
+     least one line like
+	itc MHz    : 733.390988
+     We search for this line and convert the number in an integer.  */
+  static hp_timing_t result;
+  int fd;
+
+  /* If this function was called before, we know the result.  */
+  if (result != 0)
+    return result;
+
+  fd = open ("/proc/cpuinfo", O_RDONLY);
+  if (__builtin_expect (fd != -1, 1))
+    {
+      /* XXX AFAIK the /proc filesystem can generate "files" only up
+         to a size of 4096 bytes.  */
+      char buf[4096];
+      ssize_t n;
+
+      n = read (fd, buf, sizeof buf);
+      if (__builtin_expect (n, 1) > 0)
+	{
+	  char *mhz = memmem (buf, n, "itc MHz", 7);
+
+	  if (__builtin_expect (mhz != NULL, 1))
+	    {
+	      char *endp = buf + n;
+	      int seen_decpoint = 0;
+	      int ndigits = 0;
+
+	      /* Search for the beginning of the string.  */
+	      while (mhz < endp && (*mhz < '0' || *mhz > '9') && *mhz != '\n')
+		++mhz;
+
+	      while (mhz < endp && *mhz != '\n')
+		{
+		  if (*mhz >= '0' && *mhz <= '9')
+		    {
+		      result *= 10;
+		      result += *mhz - '0';
+		      if (seen_decpoint)
+			++ndigits;
+		    }
+		  else if (*mhz == '.')
+		    seen_decpoint = 1;
+
+		  ++mhz;
+		}
+
+	      /* Compensate for missing digits at the end.  */
+	      while (ndigits++ < 6)
+		result *= 10;
+	    }
+	}
+
+      close (fd);
+    }
+
+  return result;
+}
-- 
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