From: Andreas Schwab <schwab@linux-m68k.org>
Date: Wed, 1 Nov 2017 14:26:21 +0000 (+0100)
Subject: Avoid wrong value from file-attributes on Linux kernel before 3.6
X-Git-Tag: emacs-26.0.91~419
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=8453423c7c5e1886a301fb61c4077650f59e670b;p=emacs.git

Avoid wrong value from file-attributes on Linux kernel before 3.6

* dired.c (file_attributes): Handle unsupported fstat on O_PATH
descriptors.  (bug#29070)
---

diff --git a/src/dired.c b/src/dired.c
index 28d1cffb44c..239b1acd1fb 100644
--- a/src/dired.c
+++ b/src/dired.c
@@ -953,7 +953,14 @@ file_attributes (int fd, char const *name,
     {
       record_unwind_protect_int (close_file_unwind, namefd);
       if (fstat (namefd, &s) != 0)
-	err = errno;
+	{
+	  err = errno;
+	  /* The Linux kernel before version 3.6 does not support
+	     fstat on O_PATH file descriptors.  Handle this error like
+	     missing support for O_PATH.  */
+	  if (err == EBADF)
+	    err = EINVAL;
+	}
       else
 	{
 	  err = 0;