1 files changed, 11 insertions, 2 deletions

diff --git a/src/callproc.c b/src/callproc.c
index 2c3d31ba052..6153bc1b6c6 100644
--- a/src/callproc.c
+++ b/src/callproc.c
@@ -977,8 +977,9 @@ usage: (call-process-region START END PROGRAM &optional DELETE BUFFER DISPLAY &r
   {
     USE_SAFE_ALLOCA;
     Lisp_Object pattern = Fexpand_file_name (Vtemp_file_name_pattern, tmpdir);
-    char *tempfile = SAFE_ALLOCA (SBYTES (pattern) + 1);
-    memcpy (tempfile, SDATA (pattern), SBYTES (pattern) + 1);
+    Lisp_Object encoded_tem = ENCODE_FILE (pattern);
+    char *tempfile = SAFE_ALLOCA (SBYTES (encoded_tem) + 1);
+    memcpy (tempfile, SDATA (encoded_tem), SBYTES (encoded_tem) + 1);
     coding_systems = Qt;
 
 #ifdef HAVE_MKSTEMP
@@ -995,7 +996,15 @@ usage: (call-process-region START END PROGRAM &optional DELETE BUFFER DISPLAY &r
         close (fd);
     }
 #else
+    errno = 0;
     mktemp (tempfile);
+    if (!*tempfile)
+      {
+        if (!errno)
+          errno = EEXIST;
+        report_file_error ("Failed to open temporary file using pattern",
+                           Fcons (pattern, Qnil));
+      }
 #endif
 
     filename_string = build_string (tempfile);