* cygheap.cc (init_cygheap::etc_changed): New method to signal

	a change in /etc.
	* cygheap.h (struct init_cygheap): Add member `etc_changed_h'
	and method `etc_changed'.
	* grp.cc (enum grp_state): Eliminate.
	(class grp_check): Ditto.
	(group_state): Define as `class pwdgrp_check'.
	(parse_grp): Remeber path and modification time of /etc/group file.
	* passwd.cc (enum_pwd_state): Eliminate.
	(class pwd_check): Ditto.
	(passwd_state): Define as `class pwdgrp_check'.
	(read_etc_passwd): Remember path and modification time of /etc/passwd
	file.
	* pwdgrp.h: New file.
	(enum pwdgrp_state): Substitutes `pwd_state' and `grp_state'.
	(class pwdgrp_check): Substitutes `pwd_check' and `grp_check'.

1 files changed, 34 insertions, 0 deletions

diff --git a/winsup/cygwin/cygheap.cc b/winsup/cygwin/cygheap.cc
index 53a66cfac..be52f0446 100644
--- a/winsup/cygwin/cygheap.cc
+++ b/winsup/cygwin/cygheap.cc
@@ -16,6 +16,7 @@
 #include "security.h"
 #include "fhandler.h"
 #include "dtable.h"
+#include "path.h"
 #include "cygheap.h"
 #include "child_info.h"
 #include "heap.h"
@@ -345,6 +346,39 @@ cstrdup1 (const char *s)
   return p;
 }
 
+bool
+init_cygheap::etc_changed ()
+{
+  bool res = 0;
+
+  if (!etc_changed_h)
+    {
+      path_conv pwd ("/etc");
+      etc_changed_h = FindFirstChangeNotification (pwd, FALSE,
+					      FILE_NOTIFY_CHANGE_LAST_WRITE);
+      if (etc_changed_h == INVALID_HANDLE_VALUE)
+	system_printf ("Can't open /etc for checking, %E", (char *) pwd,
+	    	       etc_changed_h);
+      else if (!DuplicateHandle (hMainProc, etc_changed_h, hMainProc,
+	    			 &etc_changed_h, 0, TRUE,
+				 DUPLICATE_SAME_ACCESS | DUPLICATE_CLOSE_SOURCE))
+	{
+	  system_printf ("Can't inherit /etc handle, %E", (char *) pwd,
+	      		 etc_changed_h);
+	  etc_changed_h = INVALID_HANDLE_VALUE;
+	}
+    }
+
+   if (etc_changed_h != INVALID_HANDLE_VALUE
+       && WaitForSingleObject (etc_changed_h, 0) == WAIT_OBJECT_0)
+     {
+       (void) FindNextChangeNotification (etc_changed_h);
+       res = 1;
+     }
+
+  return res;
+}
+
 void
 cygheap_root::set (const char *posix, const char *native)
 {