* process.c (Fstart_process):

* callproc.c (Fcall_process): Handle the case where
Funhandled_file_name_directory returns nil.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/fileio.c b/src/fileio.c
index 26020732160..76d076f75b2 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -532,6 +532,8 @@ A `directly usable' directory name is one that may be used without the
 intervention of any file handler.
 If FILENAME is a directly usable file itself, return
 \(file-name-directory FILENAME).
+If FILENAME refers to a file which is not accessible from a local process,
+then this should return nil.
 The `call-process' and `start-process' functions use this function to
 get a current directory to run processes in.  */)
      (filename)