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: [email protected]
Reporter: [email protected]
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).
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