[bug-diffutils] bug#19509: [PATCH] diff: treat fifos as identical

[Ondřej Svoboda]

(Continuation of the previous patch; may I ask the good people of the 
list to review both?)

This avoids unwanted "differences" like

  File dev1/fifo1 is a fifo while file dev2/fifo1 is a fifo
---
 src/diff.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/diff.c b/src/diff.c
index a3e1b6f..cf2c62a 100644
--- a/src/diff.c
+++ b/src/diff.c
@@ -1299,6 +1299,11 @@ compare_files (struct comparison const *parent,
              status = EXIT_FAILURE;
            }
        }
+      else if (S_ISFIFO (cmp.file[0].stat.st_mode)
+               && S_ISFIFO (cmp.file[0].stat.st_mode))
+       {
+         /* Both are fifos.  */
+       }
       else
        {
          /* We have two files that are not to be compared.  */
--
2.2.1