fcntl-h, etc.: prefer O_SEARCH to O_RDONLY when applicable

[gnulib.git] / ChangeLog

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+2010-09-01  Paul Eggert  <eggert@cs.ucla.edu>
+
+       fcntl-h, etc.: prefer O_SEARCH to O_RDONLY when applicable
+
+       POSIX 2008 specifies a new 'open' flag O_SEARCH, which can be used
+       when one needs search access to a directory but not read access.
+       On systems where it is available, it works in some cases where
+       O_RDONLY does not, namely on directories that are searchable but
+       not readable, and which need only to be searchable.  If O_SEARCH
+       is not available, fall back to the traditional method of using
+       O_RDONLY.
+
+       * lib/fcntl.in.h (O_SEARCH): #define to O_RDONLY if not defined.
+       * lib/chdir-long.c (cdb_advance_fd): Use O_SEARCH, not O_RDONLY,
+       when opening a directory that needs only to be searchable.
+       * lib/chdir-safer.c (chdir_no_follow): Likewise.
+       * lib/fts.c (diropen, fts_open, fd_ring_check): Likewise.
+       * lib/openat-proc.c (openat_proc_name): Likewise.
+       * lib/openat.c (openat_needs_fchdir): Likewise.
+       * lib/save-cwd.c (save_cwd): Likewise.
+       * lib/savewd.c (savewd_save, savewd_chdir): Likewise.
+
 2010-08-28  Bruno Haible  <bruno@clisp.org>
 
        New module 'host-cpu-c-abi'.