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Christopher Faylor <me.cygwin2012@cgf.cx>

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* fhandler.h (wait_return): Add overlapped_nullread.
* fhandler.cc (fhandler_base_overlapped::wait_overlapped): Detect zero-byte
read as a special case.
(fhandler_base_overlapped::raw_read): Keep looping when zero-byte read detected
without EOF.
(fhandler_base_overlapped::raw_write): Quiet gcc warning by adding
overlapped_nullread to switch statement even though it will never actually be
hit.
This commit is contained in:
Christopher Faylor 2012-03-12 21:29:36 +00:00
parent 6c95669d23
commit 3617fc8859
3 changed files with 22 additions and 1 deletions
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12
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,15 @@
2012-03-12 Corinna Vinschen <corinna@vinschen.de>
Christopher Faylor <me.cygwin2012@cgf.cx>
* fhandler.h (wait_return): Add overlapped_nullread.
* fhandler.cc (fhandler_base_overlapped::wait_overlapped): Detect
zero-byte read as a special case.
(fhandler_base_overlapped::raw_read): Keep looping when zero-byte read
detected without EOF.
(fhandler_base_overlapped::raw_write): Quiet gcc warning by adding
overlapped_nullread to switch statement even though it will never
actually be hit.
2012-03-10 Christopher Faylor <me.cygwin2012@cgf.cx>
* dtable.cc (fh_alloc): Treat pc.dev as unsigned.

10
winsup/cygwin/fhandler.cc
View File

@ -1982,7 +1982,11 @@ fhandler_base_overlapped::wait_overlapped (bool inres, bool writing, DWORD *byte
}
if (res == overlapped_success)
debug_printf ("normal %s, %u bytes", writing ? "write" : "read", *bytes);
{
debug_printf ("normal %s, %u bytes ispipe() %d", writing ? "write" : "read", *bytes, ispipe ());
if (*bytes == 0 && !writing && ispipe ())
res = overlapped_nullread;
}
else if (res == overlapped_nonblocking_no_data)
{
*bytes = (DWORD) -1;
@ -2020,6 +2024,9 @@ fhandler_base_overlapped::raw_read (void *ptr, size_t& len)
get_overlapped ());
switch (wait_overlapped (res, false, &nbytes, is_nonblocking ()))
{
case overlapped_nullread:
keep_looping = true;
break;
default: /* Added to quiet gcc */
case overlapped_success:
case overlapped_error:
@ -2076,6 +2083,7 @@ fhandler_base_overlapped::raw_write (const void *ptr, size_t len)
case overlapped_error:
len = 0; /* terminate loop */
case overlapped_unknown:
case overlapped_nullread:
case overlapped_nonblocking_no_data:
break;
}

1
winsup/cygwin/fhandler.h
View File

@ -629,6 +629,7 @@ protected:
overlapped_unknown = 0,
overlapped_success,
overlapped_nonblocking_no_data,
overlapped_nullread,
overlapped_error
};
bool io_pending;