(Finsert_file_contents): If the file size returned from

stat is zero, set END to READ_BUF_SIZE.  This makes sure we can
read from files on a procfs whose contents are generated
dynamically.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/fileio.c b/src/fileio.c
index 84a0c6c625c..8b6c0bd165a 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -3589,6 +3589,12 @@ actually used.")
           if (XINT (end) != st.st_size
               || ((int) st.st_size * 4) / 4 != st.st_size)
             error ("Maximum buffer size exceeded");
+
+          /* The file size returned from stat may be zero, but data
+             may be readable nonetheless, for example when this is a
+             file in the /proc filesystem.  */
+          if (st.st_size == 0)
+            XSETINT (end, READ_BUF_SIZE);
         }
     }