On 12/21/2011 10:12 AM, Joachim Schmitz wrote: >>> Write a small test program that opens say four directories, to get one >>> DIR* pointer for each. Then print a table of the DIR member values. >>> Maybe you'll see a pattern, i.e., how to derive an FD number from >>> those dd1,2,3 fields. > > Yes, indeed, thanks for that idea (should have been mine): > It got to be dd1, only it is not an fd but something called fnum and these a) > start counting with 1 rather than 0 and b) have 1 and 2 being root and CPD, > followed by 3,4 and 5 being stdin, stdout, stderr... it seems fnum -3 == fd
Yay - we can implement dirfd() in terms of dd1-3.
Please try this on coreutils:
./configure gl_cv_sys_dir_fd_member_name='dd1-3'
and if that works, then the solution is this patch to gnulib (along with
enhancing our testsuite to further test our dirfd emulation):
diff --git i/ChangeLog w/ChangeLog
index 749b538..7a6bf4b 100644
--- i/ChangeLog
+++ w/ChangeLog
@@ -1,3 +1,9 @@
+2011-12-21 Eric Blake <ebl...@redhat.com>
+
+ dirfd: port to HP NonStop
+ * m4/dirfd.m4 (gl_PREREQ_DIRFD): Also probe for NonStop variant.
+ Reported by Joachim Schmitz.
+
2011-12-14 Alex Nelson <ajnel...@cs.ucsc.edu> (tiny change)
strftime-tests: also test nanoseconds
diff --git i/m4/dirfd.m4 w/m4/dirfd.m4
index ea75e4e..031c337 100644
--- i/m4/dirfd.m4
+++ w/m4/dirfd.m4
@@ -1,4 +1,4 @@
-# serial 22 -*- Autoconf -*-
+# serial 23 -*- Autoconf -*-
dnl Find out how to get the file descriptor associated with an open DIR*.
@@ -50,8 +50,10 @@ AC_DEFUN([gl_PREREQ_DIRFD],
AC_CACHE_CHECK([how to get the file descriptor associated with an
open DIR*],
[gl_cv_sys_dir_fd_member_name],
[
+ # Most systems expose the fd directly, via d_fd or dd_fd
+ # HP NonStop instead has a member dd1, with a value 3 larger than
the fd
dirfd_save_CFLAGS=$CFLAGS
- for ac_expr in d_fd dd_fd; do
+ for ac_expr in d_fd dd_fd dd1-3; do
CFLAGS="$CFLAGS -DDIR_FD_MEMBER_NAME=$ac_expr"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
--
Eric Blake ebl...@redhat.com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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