Date: Fri, 02 Aug 2019 15:51:17 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 239604] FIONREAD ioctl returns the wrong result on a master pty after the slave has been closed Message-ID: <bug-239604-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239604 Bug ID: 239604 Summary: FIONREAD ioctl returns the wrong result on a master pty after the slave has been closed Product: Base System Version: 11.2-RELEASE Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: martin@lispworks.com Attachment #206224 text/plain mime type: Created attachment 206224 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=206224&action=edit Example to reproduce the bug Compile the attached example with: cc -lutil pty-fionread.c When it is run, I would expect it to print: bytes1 = 0 bytes2 = 0 but in FreeBSD it prints: bytes1 = 0 bytes2 = 1 It looks like the FIOREAD ioctl always returns 1 after the slave side of the pty has been closed, regardless of whether any data is available. This contradicts the man page and also differs from Linux (and Solaris and AIX, which have very different code to open the pty). -- You are receiving this mail because: You are the assignee for the bug.
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