Date: Fri, 18 Dec 2015 13:43:21 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 205398] [regression] [tty] tty_drain() kernel function lacks timeout support it had before Message-ID: <bug-205398-8@https.bugs.freebsd.org/bugzilla/>
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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: eugen@grosbein.net Keywords: regression Revision 181905 by ed@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. -- You are receiving this mail because: You are the assignee for the bug.
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