1 files changed, 95 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/common/kernel_version.c b/libc/sysdeps/linux/common/kernel_version.c
new file mode 100644
index 000000000..dacc4f0f7
--- /dev/null
+++ b/libc/sysdeps/linux/common/kernel_version.c
@@ -0,0 +1,95 @@
+/* Copyright (C) 1996 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <string.h>
+#include <sys/utsname.h>
+#include <sys/param.h>
+
+static int __linux_kernel_version = -1;
+
+static inline int
+asc2int (const char *s)
+{
+  int result = 0;
+
+  for (; *s >= '0' && *s <= '9'; s++)
+  {
+    result = result * 10 + (*s - '0');
+  }
+
+  return result;
+}
+
+static int
+set_linux_kernel_version (void)
+{
+  struct utsname uts;
+  char *version = NULL, *patchlevel = NULL, *sublevel = NULL;
+
+  if (uname (&uts))
+  {
+    __linux_kernel_version = 0;
+    return __linux_kernel_version;
+  }
+
+  version = uts.release;
+  if (version != NULL)
+  {
+    patchlevel = strchr (version, '.');
+    if (patchlevel != NULL)
+    {
+      *patchlevel = '\0';
+      patchlevel++;
+      sublevel = strchr (patchlevel, '.');
+      if (sublevel != NULL)
+      {
+	*sublevel = '\0';
+	sublevel++;
+      }
+    }
+
+    __linux_kernel_version =
+	GET_LINUX_KERNEL_VERSION (asc2int (version));
+    if (patchlevel != NULL)
+    {
+      __linux_kernel_version |=
+	GET_LINUX_KERNEL_PATCHLEVEL (asc2int (patchlevel));
+    }
+    if (sublevel != NULL)
+    {
+      __linux_kernel_version |=
+	GET_LINUX_KERNEL_SUBLEVEL (asc2int (sublevel));
+    }
+  }
+  else
+  {
+    __linux_kernel_version = 0;
+  }
+
+  return __linux_kernel_version;
+}
+
+int
+__get_linux_kernel_version (void)
+{
+  if (__linux_kernel_version != -1)
+    return __linux_kernel_version;
+    
+  return set_linux_kernel_version ();
+}