Added samefile() function.

diff --git a/Lib/posixpath.py b/Lib/posixpath.py
index 456743cff2fc02b7981947424910ea5feb2c6d47..7c13458b941be332e635cb09d47256ec708464d0 100644 (file)
--- a/Lib/posixpath.py
+++ b/Lib/posixpath.py
@@ -100,6 +100,34 @@ def islink(path):
        return stat.S_ISLNK(st[stat.ST_MODE])
 
 
+# Are two filenames really pointing to the same file?
+#
+def samefile(f1, f2):
+       s1 = posix.stat(f1)
+       s2 = posix.stat(f2)
+       return samestat(s1, s2)
+
+
+# Are two open files really referencing the same file?
+# (Not necessarily the same file descriptor!)
+# XXX Oops, posix.fstat() doesn't exist yet!
+#
+def sameopenfile(fp1, fp2):
+       s1 = posix.fstat(fp1)
+       s2 = posix.fstat(fp2)
+       return samestat(s1, s2)
+
+
+# Are two stat buffers (obtained from stat, fstat or lstat)
+# describing the same file?
+#
+def samestat(s1, s2):
+       return s1[stat.ST_INO] = s2[stat.ST_INO] and \
+               s1[stat.ST_DEV] = s2[stat.STD_DEV]
+
+
+# Subroutine and global data used by ismount().
+
 _mounts = []
 
 def _getmounts():