[newlib-cygwin] Cygwin: stdio: don't try again to read after EOF

[Ken Brown]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=1503d14af1472824322d8fa8a012173b3f27a733

commit 1503d14af1472824322d8fa8a012173b3f27a733
Author: Ken Brown <kbrown@cornell.edu>
Date:   Mon Jul 4 18:32:10 2022 -0400

    Cygwin: stdio: don't try again to read after EOF
    
    This reverts commit 1f8f7e2d54, "* libc/stdio/refill.c (__srefill):
    Try again after EOF on Cygwin."  If EOF is set on a file, the stdio
    input functions will now immediately return EOF rather than trying
    again to read.  This aligns Cygwin's behavior to that of Linux.
    
    Addresses: https://cygwin.com/pipermail/cygwin/2022-June/251672.html

Diff:
---
 newlib/libc/stdio/refill.c  | 8 --------
 winsup/cygwin/release/3.4.0 | 4 ++++
 winsup/doc/new-features.xml | 4 ++++
 3 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/newlib/libc/stdio/refill.c b/newlib/libc/stdio/refill.c
index 8516d8576..91e79e832 100644
--- a/newlib/libc/stdio/refill.c
+++ b/newlib/libc/stdio/refill.c
@@ -47,11 +47,9 @@ __srefill_r (struct _reent * ptr,
 
   fp->_r = 0;			/* largely a convenience for callers */
 
-#ifndef __CYGWIN__
   /* SysV does not make this test; take it out for compatibility */
   if (fp->_flags & __SEOF)
     return EOF;
-#endif
 
   /* if not already reading, have to be reading and writing */
   if ((fp->_flags & __SRD) == 0)
@@ -115,13 +113,7 @@ __srefill_r (struct _reent * ptr,
 
   fp->_p = fp->_bf._base;
   fp->_r = fp->_read (ptr, fp->_cookie, (char *) fp->_p, fp->_bf._size);
-#ifndef __CYGWIN__
   if (fp->_r <= 0)
-#else
-  if (fp->_r > 0)
-    fp->_flags &= ~__SEOF;
-  else
-#endif
     {
       if (fp->_r == 0)
 	fp->_flags |= __SEOF;
diff --git a/winsup/cygwin/release/3.4.0 b/winsup/cygwin/release/3.4.0
index a12905a46..ff600deca 100644
--- a/winsup/cygwin/release/3.4.0
+++ b/winsup/cygwin/release/3.4.0
@@ -17,6 +17,10 @@ What changed:
   opened in byte mode rather than message mode.
   Addresses: https://cygwin.com/pipermail/cygwin/2021-March/247987.html
 
+- The stdio input functions no longer try again to read after EOF.
+  This aligns Cygwin behavior to that of Linux.
+  Addresses: https://cygwin.com/pipermail/cygwin/2022-June/251672.html
+
 
 Bug Fixes
 ---------
diff --git a/winsup/doc/new-features.xml b/winsup/doc/new-features.xml
index c696a972a..0149a027a 100644
--- a/winsup/doc/new-features.xml
+++ b/winsup/doc/new-features.xml
@@ -29,6 +29,10 @@ opened in byte mode rather than message mode.
 Handle UDP_SEGMENT and UDP_GRO socket options.
 </para></listitem>
 
+<listitem><para>
+The stdio input functions no longer try again to read after EOF.
+</para></listitem>
+
 </itemizedlist>
 
 </sect2>