[newlib-cygwin] Add global __sglue object for all configurations

[Sebastian Huber <sh@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=8b96542ed18990c9300daa4faba89ce8227b4482

commit 8b96542ed18990c9300daa4faba89ce8227b4482
Author: Matt Joyce <matthew.joyce@embedded-brains.de>
Date:   Mon May 2 08:58:25 2022 +0200

    Add global __sglue object for all configurations
    
    Added a new global __sglue object for all configurations.
    Decouples the global file object list from the _GLOBAL_REENT
    structure by using this new object instead of the __sglue member
    of _GLOBAL_REENT in __sfp() and _fwalk_sglue().

Diff:
---
 newlib/libc/include/sys/reent.h |  2 ++
 newlib/libc/stdio/fcloseall.c   |  2 +-
 newlib/libc/stdio/fflush.c      |  2 +-
 newlib/libc/stdio/findfp.c      | 15 +++++++++------
 newlib/libc/stdio/refill.c      |  2 +-
 winsup/cygwin/syscalls.cc       |  2 +-
 6 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/newlib/libc/include/sys/reent.h b/newlib/libc/include/sys/reent.h
index 469f2df28..44a671079 100644
--- a/newlib/libc/include/sys/reent.h
+++ b/newlib/libc/include/sys/reent.h
@@ -304,6 +304,8 @@ struct _glue
   __FILE *_iobs;
 };
 
+extern struct _glue __sglue;
+
 /*
  * rand48 family support
  *
diff --git a/newlib/libc/stdio/fcloseall.c b/newlib/libc/stdio/fcloseall.c
index 4d4e3554b..f14c28d34 100644
--- a/newlib/libc/stdio/fcloseall.c
+++ b/newlib/libc/stdio/fcloseall.c
@@ -67,7 +67,7 @@ _fcloseall_r (struct _reent *ptr)
 int
 fcloseall (void)
 {
-  return _fcloseall_r (_GLOBAL_REENT);
+  return _fwalk_sglue (_GLOBAL_REENT, _fclose_r, &__sglue);
 }
 
 #endif
diff --git a/newlib/libc/stdio/fflush.c b/newlib/libc/stdio/fflush.c
index 6e946da7b..bbec4a19b 100644
--- a/newlib/libc/stdio/fflush.c
+++ b/newlib/libc/stdio/fflush.c
@@ -286,7 +286,7 @@ int
 fflush (register FILE * fp)
 {
   if (fp == NULL)
-    return _fwalk_sglue (_GLOBAL_REENT, _fflush_r, &_GLOBAL_REENT->__sglue);
+    return _fwalk_sglue (_GLOBAL_REENT, _fflush_r, &__sglue);
 
   return _fflush_r (_REENT, fp);
 }
diff --git a/newlib/libc/stdio/findfp.c b/newlib/libc/stdio/findfp.c
index 1627032a3..29c068a12 100644
--- a/newlib/libc/stdio/findfp.c
+++ b/newlib/libc/stdio/findfp.c
@@ -39,6 +39,13 @@ const struct __sFILE_fake __sf_fake_stderr =
 
 #ifdef _REENT_GLOBAL_STDIO_STREAMS
 __FILE __sf[3];
+struct _glue __sglue = {NULL, 3, &__sf[0]};
+#else
+#ifdef _REENT_SMALL
+struct _glue __sglue = {NULL, 0, NULL};
+#else
+struct _glue __sglue = {NULL, 3, &_GLOBAL_REENT->__sf[0]};
+#endif
 #endif
 
 #ifdef _STDIO_BSD_SEMANTICS
@@ -158,7 +165,7 @@ sfmoreglue (struct _reent *d, int n)
 static void
 stdio_exit_handler (void)
 {
-  (void) _fwalk_sglue (_GLOBAL_REENT, CLEANUP_FILE, &_GLOBAL_REENT->__sglue);
+  (void) _fwalk_sglue (_GLOBAL_REENT, CLEANUP_FILE, &__sglue);
 }
 
 /*
@@ -175,15 +182,11 @@ __sfp (struct _reent *d)
   _newlib_sfp_lock_start ();
 
   if (__stdio_exit_handler == NULL) {
-#ifdef _REENT_GLOBAL_STDIO_STREAMS
-    _GLOBAL_REENT->__sglue._niobs = 3;
-    _GLOBAL_REENT->__sglue._iobs = &__sf[0];
-#endif
     __sinit (_GLOBAL_REENT);
     __stdio_exit_handler = stdio_exit_handler;
   }
 
-  for (g = &_GLOBAL_REENT->__sglue;; g = g->_next)
+  for (g = &__sglue;; g = g->_next)
     {
       for (fp = g->_iobs, n = g->_niobs; --n >= 0; fp++)
 	if (fp->_flags == 0)
diff --git a/newlib/libc/stdio/refill.c b/newlib/libc/stdio/refill.c
index 4084d7250..8516d8576 100644
--- a/newlib/libc/stdio/refill.c
+++ b/newlib/libc/stdio/refill.c
@@ -105,7 +105,7 @@ __srefill_r (struct _reent * ptr,
       /* Ignore this file in _fwalk_sglue to avoid potential deadlock. */
       short orig_flags = fp->_flags;
       fp->_flags = 1;
-      (void) _fwalk_sglue (_GLOBAL_REENT, lflush, &_GLOBAL_REENT->__sglue);
+      (void) _fwalk_sglue (_GLOBAL_REENT, lflush, &__sglue);
       fp->_flags = orig_flags;
 
       /* Now flush this file without locking it. */
diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc
index fb994ac41..bb9df76cf 100644
--- a/winsup/cygwin/syscalls.cc
+++ b/winsup/cygwin/syscalls.cc
@@ -3135,7 +3135,7 @@ cygwin_setmode (int fd, int mode)
 	_my_tls.locals.setmode_mode = O_TEXT;
       else
 	_my_tls.locals.setmode_mode = O_BINARY;
-      _fwalk_sglue (_GLOBAL_REENT, setmode_helper, &_GLOBAL_REENT->__sglue);
+      _fwalk_sglue (_GLOBAL_REENT, setmode_helper, &__sglue);
     }
   return res;
 }