[newlib-cygwin] Cygwin: stat: fix st_mode of fifos

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=f36262d56ac78f04de147746ce4a85c6155e4a23

commit f36262d56ac78f04de147746ce4a85c6155e4a23
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Wed Jan 29 15:14:05 2020 +0100

    Cygwin: stat: fix st_mode of fifos
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygwin/fhandler_disk_file.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/winsup/cygwin/fhandler_disk_file.cc b/winsup/cygwin/fhandler_disk_file.cc
index be45ad7..f362e31 100644
--- a/winsup/cygwin/fhandler_disk_file.cc
+++ b/winsup/cygwin/fhandler_disk_file.cc
@@ -480,7 +480,7 @@ fhandler_base::fstat_helper (struct stat *buf)
     {
       /* If read-only attribute is set, modify ntsec return value */
       if (::has_attribute (attributes, FILE_ATTRIBUTE_READONLY)
-	  && !pc.isdir () && !pc.issymlink ())
+	  && !pc.isdir () && !pc.issymlink () && !pc.is_fs_special ())
 	buf->st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
 
       if (buf->st_mode & S_IFMT)
@@ -490,7 +490,7 @@ fhandler_base::fstat_helper (struct stat *buf)
       else
 	{
 	  buf->st_dev = buf->st_rdev = dev ();
-	  buf->st_mode = dev ().mode ();
+	  buf->st_mode |= dev ().mode () & S_IFMT;
 	  buf->st_size = 0;
 	}
     }