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Cygwin: FIFO: synchronize the blocking mode of a writer's pipe

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The blocking mode of the Windows pipe underlying a writer is set to
match that of the writer itself when the latter is opened.  Define
fhandler_fifo::fcntl to keep the pipe and the writer in sync if the
blocking mode is changed via fcntl.
This commit is contained in:
Ken Brown
2019-04-25 18:21:11 -04:00
parent f527171a93
commit 440559c40a
2 changed files with 17 additions and 0 deletions
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1
winsup/cygwin/fhandler.h
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@@ -1294,6 +1294,7 @@ public:
int open (int, mode_t);
off_t lseek (off_t offset, int whence);
int close ();
int fcntl (int cmd, intptr_t);
int dup (fhandler_base *child, int);
bool isfifo () const { return true; }
void set_close_on_exec (bool val);

16
winsup/cygwin/fhandler_fifo.cc
View File

@@ -891,6 +891,22 @@ fhandler_fifo::close ()
return fhandler_base::close () || ret;
}
/* If we're a writer, keep the nonblocking state of the windows pipe
in sync with our nonblocking state. */
int
fhandler_fifo::fcntl (int cmd, intptr_t arg)
{
if (cmd != F_SETFL || !writer)
return fhandler_base::fcntl (cmd, arg);
const bool was_nonblocking = is_nonblocking ();
int res = fhandler_base::fcntl (cmd, arg);
const bool now_nonblocking = is_nonblocking ();
if (now_nonblocking != was_nonblocking)
set_pipe_non_blocking (get_handle (), now_nonblocking);
return res;
}
int
fhandler_fifo::dup (fhandler_base *child, int flags)
{