fdopendir: fix bug on MacOS X when low on file descriptors

[gnulib.git] / ChangeLog

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+2010-11-07  Paul Eggert  <eggert@cs.ucla.edu>
+
+       fdopendir: fix bug on MacOS X when low on file descriptors
+
+       * lib/fdopendir.c (REPLACE_FCHDIR): #define to 0 if not defined.
+       (fdopendir_with_dup, fd_clone_opendir): Now have extra CWD arg.
+       All callers changed.
+       (fdopendir): Invoke save_cwd at the top level, not after using
+       multiple dup() calls to use up file descriptors.  Then retry
+       fdopendir_with_dup.  This avoids failure with EMFILE if FD is 1
+       less than the maximum number of open file descriptors, because
+       save_cwd fails with errno == EMFILE.  Problem reported by tsteven4
+       on Mac OS X 10.6.4 for tar 1.24
+       <http://lists.gnu.org/archive/html/bug-tar/2010-10/msg00084.html>
+       <http://lists.gnu.org/archive/html/bug-tar/2010-11/msg00000.html>
+       and for tar 1.25
+       <http://lists.gnu.org/archive/html/bug-tar/2010-11/msg00038.html>.
+
 2010-11-07  Bruno Haible  <bruno@clisp.org>
 
        vasnprintf: Support I flag on glibc systems.