* cygwin.din: Export fdopendir.

	* dir.cc (opendir): Call fhandler's opendir with fd set to -1.
	(fdopendir): New function.
	(seekdir64): Use dirent_info_mask.
	(rewinddir): Ditto.
	(closedir): Only release underlying file descriptor if it has been
	reserved by opendir itself.
	* fhandler.cc (fhandler_base::opendir): Accommodate new parameter.
	* fhandler.h (dirent_states): Add dirent_valid_fd and dirent_info_mask.
	(fhander_XXX::opendir): Add file descriptor parameter.  Use regparms.
	(fhandler_procnet::opendir): Drop declaration.
	* fhandler_disk_file.cc (fhandler_disk_file::opendir): Ditto.
	If called from fdopendir, use existing handle to re-open directory
	with valid flags.  Rename fd to cfd.  Use only if no valid incoming fd.
	(fhandler_cygdrive::opendir): Accommodate new parameter.
	* fhandler_process.cc (fhandler_process::opendir): Ditto.
	* fhandler_procnet.cc (fhandler_procnet::opendir): Drop definition.
	* fhandler_virtual.cc (fhandler_virtual::opendir): Accommodate new
	parameter.  Only create new file descriptor entry if called from
	opendir.  Remove duplicated setting of dir->__flags.
	* posix.sgml: Add fdopendir to list of implemented Solaris functions.
	* include/cygwin/version.h: Bump API minor number.
	* include/sys/dirent.h: Declare fdopendir.

1 files changed, 19 insertions, 4 deletions

diff --git a/winsup/cygwin/dir.cc b/winsup/cygwin/dir.cc
index 3d0dbae7b..2ce0488c5 100644
--- a/winsup/cygwin/dir.cc
+++ b/winsup/cygwin/dir.cc
@@ -61,7 +61,7 @@ opendir (const char *name)
   if (!fh)
     res = NULL;
   else if (fh->exists ())
-    res = fh->opendir ();
+    res = fh->opendir (-1);
   else
     {
       set_errno (ENOENT);
@@ -73,6 +73,17 @@ opendir (const char *name)
   return res;
 }
 
+extern "C" DIR *
+fdopendir (int fd)
+{
+  DIR *res = NULL;
+
+  cygheap_fdget cfd (fd);
+  if (cfd >= 0)
+    res = cfd->opendir (fd);
+  return res;
+}
+
 static int
 readdir_worker (DIR *dir, dirent *de)
 {
@@ -204,7 +215,7 @@ seekdir64 (DIR *dir, _off64_t loc)
 
   if (dir->__d_cookie != __DIRENT_COOKIE)
     return;
-  dir->__flags &= (dirent_isroot | dirent_get_d_ino | dirent_set_d_ino);
+  dir->__flags &= dirent_info_mask;
   return ((fhandler_base *) dir->__fh)->seekdir (dir, loc);
 }
 
@@ -225,7 +236,7 @@ rewinddir (DIR *dir)
 
   if (dir->__d_cookie != __DIRENT_COOKIE)
     return;
-  dir->__flags &= (dirent_isroot | dirent_get_d_ino | dirent_set_d_ino);
+  dir->__flags &= dirent_info_mask;
   return ((fhandler_base *) dir->__fh)->rewinddir (dir);
 }
 
@@ -249,7 +260,11 @@ closedir (DIR *dir)
 
   int res = ((fhandler_base *) dir->__fh)->closedir (dir);
 
-  cygheap->fdtab.release (dir->__d_fd);
+  /* If the directory has been opened by fdopendir, the descriptor
+     entry is used elsewhere in the application and must not be removed
+     from the descriptor table. */
+  if (!(dir->__flags & dirent_valid_fd))
+    cygheap->fdtab.release (dir->__d_fd);
 
   free (dir->__d_dirname);
   free (dir->__d_dirent);