* dlopen.c (dlopen): Return NULL when name is NULL (suggested by

chrisiasci@aol.com).
* cygwin.din: Add a new, internally used export - _check_for_executable.
* dcrt0.cc (dll_crt0_1): Set _check_for_executable for older binaries.  Pass
user_data to premain functions.
* fhandler.cc (fhandler_disk_file::open): Only check for executable if the
linked program is intereested in the executable bit.
(fhandler_disk_file::check_execable_p): Delete.
* fhandler.h (executable_states): New enumeration of various states of
executable bit caring.
(fhandler_base::set_execable_p): New method.
* fhandler_termios.cc (fhandler_termios::line_edit): Flag when a signal has
been sent to the tty.  Return -1 when this is so.
* fhandler_console.cc (fhandler_console::read): Return -1 when signal sending
character encountered.
* path.cc (path_conv::check): Record when path refers to a disk device.  Move
executable extension check here.
(check_sysfile): Accomodate new EXEC path states.
(has_suffix): Remove.
(next_suffix): Remove.
(class suffix_scan): New clas.
(suffix_scan::has): New method.
(suffix_scan:next): New method.
(symlink_info::check): Use suffix_scan method to control for scanning for
suffixes.
* path.h (path_conv::exec_state): New method.
* perprocess.h: Make "C" friendly.
* include/cygwin/version.h: Define CYGWIN_VERSION_CHECK_FOR_S_IEXEC.  Bump
CYGWIN_VERSION_API_MINOR.
* include/sys/cygwin.h: Change premain declarations.
* winsup.h: Move __cplusplus test to after builtin defines.

1 files changed, 16 insertions, 2 deletions

diff --git a/winsup/cygwin/path.h b/winsup/cygwin/path.h
index 6d0a195..40b8eec 100644
--- a/winsup/cygwin/path.h
+++ b/winsup/cygwin/path.h
@@ -37,6 +37,8 @@ enum path_types
   PATH_EXEC = MOUNT_EXEC,
   PATH_CYGWIN_EXEC = MOUNT_CYGWIN_EXEC,
   PATH_ALL_EXEC = PATH_CYGWIN_EXEC | PATH_EXEC,
+  PATH_ISDISK =	      0x04000000,
+  PATH_NOTEXEC =      0x08000000,
   PATH_HAS_SYMLINKS = 0x10000000,
   PATH_HASBUGGYOPEN = 0x20000000,
   PATH_SOCKET =       0x40000000,
@@ -50,6 +52,7 @@ class path_conv
 
   unsigned path_flags;
 
+  int isdisk () {return path_flags & PATH_ISDISK;}
   int has_acls () {return path_flags & PATH_HASACLS;}
   int has_symlinks () {return path_flags & PATH_HAS_SYMLINKS;}
   int hasgood_inode () {return path_flags & PATH_HASACLS;}  // Not strictly correct
@@ -57,13 +60,24 @@ class path_conv
   int isbinary () {return path_flags & PATH_BINARY;}
   int issymlink () {return path_flags & PATH_SYMLINK;}
   int issocket () {return path_flags & PATH_SOCKET;}
-  int isexec () {return path_flags & PATH_ALL_EXEC;}
   int iscygexec () {return path_flags & PATH_CYGWIN_EXEC;}
+  executable_states exec_state ()
+  {
+    extern int _check_for_executable;
+    if (path_flags & PATH_ALL_EXEC)
+      return is_executable;
+    if (path_flags & PATH_NOTEXEC)
+      return not_executable;
+    if (!_check_for_executable)
+      return dont_care_if_executable;
+    return dont_know_if_executable;
+  }
 
   void set_binary () {path_flags |= PATH_BINARY;}
   void set_symlink () {path_flags |= PATH_SYMLINK;}
   void set_has_symlinks () {path_flags |= PATH_HAS_SYMLINKS;}
-  void set_exec (int x = 1) {path_flags |= x ? PATH_EXEC : PATH_NOTHING;}
+  void set_isdisk () {path_flags |= PATH_ISDISK;}
+  void set_exec (int x = 1) {path_flags |= x ? PATH_EXEC : PATH_NOTEXEC;}
   void set_has_acls (int x = 1) {path_flags |= x ? PATH_HASACLS : PATH_NOTHING;}
   void set_has_buggy_open (int x = 1) {path_flags |= x ? PATH_HASBUGGYOPEN : PATH_NOTHING;}