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Workaround for drivers with broken flush

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term_flush() does not work with some drivers. If we try to drain or even
close the port while there are still data in it's output buffers *and*
flow-control is enabled, we may block forever. So we "fake" a flush, by
temporarily setting f/c to none, waiting for any data in the output
buffer to drain, and then reseting f/c to it's original setting.
This commit is contained in:
Nick Patavalis
2017-12-20 09:48:00 +02:00
parent e6653b45b5
commit 89be292023
3 changed files with 79 additions and 0 deletions
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10
picocom.c
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@ -520,6 +520,16 @@ cleanup (int drain, int noreset)
if ( drain )
term_drain(tty_fd);
term_flush(tty_fd);
/* term_flush does not work with some drivers. If we try to
drain or even close the port while there are still data in
it's output buffers *and* flow-control is enabled we may
block forever. So we "fake" a flush, by temporarily setting
f/c to none, waiting for any data in the output buffer to
drain, and then reseting f/c to it's original setting. If
the real flush above does works, then the fake one should
amount to instantaneously switching f/c to none and then
back to its propper setting. */
if ( opts.flow != FC_NONE ) term_fake_flush(tty_fd);
term_set_hupcl(tty_fd, !noreset);
term_apply(tty_fd, 1);
if ( noreset ) {