Re: buffering of process output

[Andreas Schwab]

address@hidden (Kim F. Storm) writes:

> So I wonder if X somehow causes read from a pipe to buffer things
> differently [line buffering perhaps] (or the pipe to be setup
> differently)?

It doesn't.  It's because there is no call to XFlush during the read loop
in call-process.  See the comment in xterm.c:

/* Remove calls to XFlush by defining XFlush to an empty replacement.
   Calls to XFlush should be unnecessary because the X output buffer
   is flushed automatically as needed by calls to XPending,
   XNextEvent, or XWindowEvent according to the XFlush man page.
   XTread_socket calls XPending.  Removing XFlush improves
   performance.  */

Thus redisplay_preserve_echo_area does not call XFlush any more.

Andreas.

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Andreas Schwab, SuSE Labs, address@hidden
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