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Cygwin: pipe: Fix incorrect write length in raw_write() 

If the write length is more than the pipe space in non-blocking
mode, the write length is wrongly set to 65536. This causes access
violation. This patch fixes that.

Fixes: 7ed9adb356 ("Cygwin: pipe: Switch pipe mode to blocking mode by default")
Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>
This commit is contained in:
Takashi Yano 2024-11-06 14:06:58 +09:00
parent df0953aa29
commit cbfaeba4f7
1 changed files with 2 additions and 4 deletions
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6
winsup/cygwin/fhandler/pipe.cc
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@ -532,10 +532,8 @@ fhandler_pipe_fifo::raw_write (const void *ptr, size_t len)
}
}
if (len <= (size_t) avail || pipe_buf_size == 0)
if (len <= (size_t) avail)
chunk = len;
else if (is_nonblocking ())
chunk = len = pipe_buf_size;
else
chunk = avail;
@ -555,7 +553,7 @@ fhandler_pipe_fifo::raw_write (const void *ptr, size_t len)
ULONG len1;
DWORD waitret = WAIT_OBJECT_0;
if (left > chunk)
if (left > chunk && !is_nonblocking ())
len1 = chunk;
else
len1 = (ULONG) left;