Tweak AFSDIR_PATH_MAX definition

On recent Debian, we run into runtime errors in the test suite
because _POSIX_PATH_MAX is only 256, and that buffer is too small
for a call to realpath().  Use PATH_MAX if it's available and larger
than _POSIX_PATH_MAX, in a way that should be safe even when PATH_MAX
is not defined.

Reviewed-on: http://gerrit.openafs.org/11453
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Reviewed-by: Chas Williams - CONTRACTOR <chas@cmf.nrl.navy.mil>
Reviewed-by: Perry Ruiter <pruiter@sinenomine.net>
Reviewed-by: D Brashear <shadow@your-file-system.com>
Tested-by: D Brashear <shadow@your-file-system.com>
(cherry picked from commit ec2382e060753dfdcaf84b9ac03e1534c65fcdbc)

Change-Id: I37222dcb019ed9593a499b84a3e4ab30b8a9cf9c
Reviewed-on: http://gerrit.openafs.org/11588
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Daria Phoebe Brashear <shadow@your-file-system.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>

diff --git a/src/util/dirpath.hin b/src/util/dirpath.hin
index 2890426328f56f257a7e9119a06f7dfec937c992..ae6d2cf58674982a97d1da624909891e85d09daa 100644 (file)
--- a/src/util/dirpath.hin
+++ b/src/util/dirpath.hin
@@ -75,7 +75,14 @@
 #ifdef AFS_NT40_ENV
 #define AFSDIR_PATH_MAX MAX_PATH
 #else /* unices */
-#define AFSDIR_PATH_MAX    _POSIX_PATH_MAX
+# ifndef PATH_MAX
+#  define PATH_MAX          1024
+# endif
+# if PATH_MAX > _POSIX_PATH_MAX
+#  define AFSDIR_PATH_MAX   PATH_MAX
+# else
+#  define AFSDIR_PATH_MAX   _POSIX_PATH_MAX
+# endif
 #endif