Document File.{setuid?,setgid?,sticky?} support for IO objects [Bug #13972]

* file.c (rb_file_setuid_p): rdoc for IO object support
  (rb_file_sgid_p): ditto (rb_file_sticky_p): ditto
* NEWS: inform users of new feature
* test/file/test_file_exhaustive.rb (io_open): wrapper for bare IO
  object (test_suid): test for bare IO support (test_sgid): ditto
  (test_sticky): ditto

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65235 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 0 deletions

diff --git a/file.c b/file.c
index 66f62024d8..3ee966cec2 100644
--- a/file.c
+++ b/file.c
@@ -1948,6 +1948,8 @@ check3rdbyte(VALUE fname, int mode)
  *   File.setuid?(file_name)   ->  true or false
  *
  * Returns <code>true</code> if the named file has the setuid bit set.
+ *
+ * _file_name_ can be an IO object.
  */
 
 static VALUE
@@ -1965,6 +1967,8 @@ rb_file_suid_p(VALUE obj, VALUE fname)
  *   File.setgid?(file_name)   ->  true or false
  *
  * Returns <code>true</code> if the named file has the setgid bit set.
+ *
+ * _file_name_ can be an IO object.
  */
 
 static VALUE
@@ -1982,6 +1986,8 @@ rb_file_sgid_p(VALUE obj, VALUE fname)
  *   File.sticky?(file_name)   ->  true or false
  *
  * Returns <code>true</code> if the named file has the sticky bit set.
+ *
+ * _file_name_ can be an IO object.
  */
 
 static VALUE