* external.cc (create_winenv): Rename from sync_winenv. Take

environment pointer as parameter and return pointer to corresponding
	win32 environment block if != NULL.  Otherwise just sync as before.
	(cygwin_internal): Add CW_CVT_ENV_TO_WINENV case.
	* include/cygwin/version.h: Bump API minor number.
	* include/sys/cygwin.h (cygwin_getinfo_types): Add CW_CVT_ENV_TO_WINENV.

winsup/cygwin/ChangeLog

@@ -1,3 +1,12 @@
+2011-10-05  Corinna Vinschen  <corinna@vinschen.de>
+
+	* external.cc (create_winenv): Rename from sync_winenv.  Take
+	environment pointer as parameter and return pointer to corresponding
+	win32 environment block if != NULL.  Otherwise just sync as before.
+	(cygwin_internal): Add CW_CVT_ENV_TO_WINENV case.
+	* include/cygwin/version.h: Bump API minor number.
+	* include/sys/cygwin.h (cygwin_getinfo_types): Add CW_CVT_ENV_TO_WINENV.
+
 2011-10-04  Corinna Vinschen  <corinna@vinschen.de>
 
 	* net.cc (socketpair): Bind first socket to loopback only as well.

winsup/cygwin/external.cc

@@ -132,12 +132,12 @@ check_ntsec (const char *filename)
 }
 
 /* Copy cygwin environment variables to the Windows environment. */
-static void
+static PWCHAR
-sync_winenv ()
+create_winenv (const char * const *env)
 {
   int unused_envc;
   PWCHAR envblock = NULL;
-  char **envp = build_env (cur_environ (), envblock, unused_envc, false);
+  char **envp = build_env (env ?: cur_environ (), envblock, unused_envc, false);
   PWCHAR p = envblock;
 
   if (envp)
@@ -146,8 +146,12 @@ sync_winenv ()
 	cfree (*e);
       cfree (envp);
     }
+  /* If we got an env block, just return pointer to win env. */
+  if (env)
+    return envblock;
+  /* Otherwise sync win env of current process with its posix env. */
   if (!p)
-    return;
+    return NULL;
   while (*p)
     {
       PWCHAR eq = wcschr (p, L'=');
@@ -160,6 +164,7 @@ sync_winenv ()
       p = wcschr (p, L'\0') + 1;
     }
   free (envblock);
+  return NULL;
 }
 
 /*
@@ -419,7 +424,7 @@ cygwin_internal (cygwin_getinfo_types t, ...)
 	try_to_debug ();
 	break;
       case CW_SYNC_WINENV:
-	sync_winenv ();
+	create_winenv (NULL);
 	res = 0;
 	break;
       case CW_CYGTLS_PADSIZE:
@@ -516,6 +521,13 @@ cygwin_internal (cygwin_getinfo_types t, ...)
 	}
 	break;
 
+      case CW_CVT_ENV_TO_WINENV:
+	{
+	  char **posix_env = va_arg (arg, char **);
+	  res = (uintptr_t) create_winenv (posix_env);
+	}
+	break;
+
       default:
 	set_errno (ENOSYS);
     }

winsup/cygwin/include/cygwin/version.h

@@ -420,12 +420,13 @@ details. */
       249: Export pthread_condattr_getclock, pthread_condattr_setclock.
       250: Export clock_nanosleep.
       251: RTLD_NODELETE, RTLD_NOLOAD, RTLD_DEEPBIND added.
+      252: CW_CVT_ENV_TO_WINENV added.
      */
 
      /* Note that we forgot to bump the api for ualarm, strtoll, strtoull */
 
 #define CYGWIN_VERSION_API_MAJOR 0
-#define CYGWIN_VERSION_API_MINOR 251
+#define CYGWIN_VERSION_API_MINOR 252
 
      /* There is also a compatibity version number associated with the
 	shared memory regions.  It is incremented when incompatible

winsup/cygwin/include/sys/cygwin.h

@@ -134,7 +134,8 @@ typedef enum
     CW_INT_SETLOCALE,
     CW_CVT_MNT_OPTS,
     CW_LST_MNT_OPTS,
-    CW_STRERROR
+    CW_STRERROR,
+    CW_CVT_ENV_TO_WINENV
   } cygwin_getinfo_types;
 
 /* Token type for CW_SET_EXTERNAL_TOKEN */