https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205398
Bug ID: 205398
Summary: [regression] [tty] tty_drain() kernel function lacks
timeout support it had before
Product: Base System
Version: 10.2-STABLE
Hardware: Any
OS: Any
Status: New
Keywords: regression
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: eu...@grosbein.net
Keywords: regression
Revision 181905 by e...@freebsd.org brought the new MPSAFE TTY layer and removed
"drainwain" timeout support. Now applications working with serial port can hang
forever on close() system call:
- an application opens /dev/cuau0 in non-blocing i/o mode and tries to detect
GSM gateway there writing commands like ATZ, ATE1 etc. to the device;
- the device may be dead (lost power, broken, disconnected etc.) and does not
answer back;
- application timeouts waiting for answer and closes device with close()
- tty layer tries to drain output "forever", until a signal arrives.
gnokii (comms/gnokii) suffers from this problem.
Please re-implement tunable timeout and TIOCSDRAINWAIT syscall kernel has
before.
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