* hinfo.cc (hinfo::linearize_fd_array): Make max_used_fd an int so that we can

detect when there are no fds to pass.
* dcrt0.cc (host_dependent_constants::init): Revert Sat Mar 18 01:32:04 2000
change.
(dll_crt0_1): Set "cygwin_finished_initializing" flag.
(dll_crt0): Don't perform memcpy if uptr is already set to internal structure.
(_dll_crt0): Remember location of programs envptr.
* dll_init.h (per_module, dll, dll_list): Revamp.
* dll_init.cc: Revamp.  Use new classes.
* fork.cc (fork): Use new revamped dll, dll_list, and per_module stuff.
* environ.cc: Use __cygwin_environ throughout rather than the
user_data->envptr.
* exec.cc: Ditto.
* spawn.cc: Ditto.
* winsup.h: Declare update_envptrs, cygwin_finished_initializing.
* lib/_cygwin_crt0_common.cc (_cygwin_crt0_common): Revert previous change.
* lib/cygwin_attach_dll.cc (cygwin_attach_dll): Always pass in own per_process
structure or we end up overwriting information from the main program.

winsup/cygwin/environ.cc

@@ -13,7 +13,7 @@ details. */
 #include <ctype.h>
 #include <fcntl.h>
 
-#define environ (*user_data->envptr)
+#define environ __cygwin_environ
 
 extern BOOL allow_glob;
 extern BOOL allow_ntea;
@@ -228,11 +228,12 @@ setenv (const char *name, const char *value, int rewrite)
 
       for (P = environ, cnt = 0; *P; ++P, ++cnt)
 	;
-      __cygwin_environ = environ = (char **) realloc ((char *) environ,
-		      (size_t) (sizeof (char *) * (cnt + 2)));
+      environ = (char **) realloc ((char *) environ,
+				   (size_t) (sizeof (char *) * (cnt + 2)));
       if (!environ)
 	return -1;
       environ[cnt + 1] = NULL;
+      update_envptrs ();
       offset = cnt;
     }
 
@@ -502,7 +503,8 @@ environ_init (int already_posix)
   if (!sawTERM)
     envp[i++] = strdup ("TERM=cygwin");
   envp[i] = NULL;
-  __cygwin_environ = environ = envp;
+  environ = envp;
+  update_envptrs ();
   FreeEnvironmentStringsA ((char *) rawenv);
   parse_options (NULL);
   MALLOC_CHECK;