I noticed that when I straced rpm it called close(<a large
number>), and that this number had been retuned by read()
previously.

This could be a problem if the config file is really short,
or if lots of files are opened.

This patch is against the popt from rpm.

--- popt/poptconfig.c~  Thu Oct  8 07:20:04 1998
+++ popt/poptconfig.c   Sat Mar 13 00:51:23 1999
@@ -83,7 +83,7 @@
     lseek(fd, 0, 0);

     file = alloca(fileLength + 1);
-    if ((fd = read(fd, file, fileLength)) != fileLength) {
+    if (read(fd, file, fileLength) != fileLength) {
        rc = errno;
        close(fd);
        errno = rc;