Vladimir Grebenshchikov e8923c7346 devfs: make persistent controlling terminal an ABI property ...

Linux leaves the session's controlling terminal in place after the
last file descriptor on the slave is closed, so a later open of
/dev/tty succeeds.  FreeBSD drops the session vnode reference on that
close. /dev/tty then fails, which breaks Linux programs such as xterm
that close the pty slave during startup and expect /dev/tty to keep
working.

When the closer is a Linux process, leave the session reference in
place.  Still pass FLASTCLOSE to the driver so the master sees hangup.
Native close behavior is unchanged.

Add the SV_PERSISTENT_CTTY sysentvec flag for ABIs that retain the
controlling terminal after the last slave descriptor is closed.  This
keeps the devfs behavior ABI-agnostic and allows other ABIs to request
the same semantics if needed.  Use the flag in devfs_close().

Reviewed by:	kib
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D60701

2026-10-20 20:38:09 +03:00

..

devfs_devs.c

sysctl(9): Ease exporting struct sizes; Discourage doing that

2025-05-07 12:13:40 +02:00

devfs_dir.c

style(9): white space after ; and around binary operators

2025-10-16 15:02:50 -07:00

devfs_int.h

devfs: make destroy_dev() a release barrier for cdevpriv destructors runs

2025-10-24 19:09:25 +03:00

devfs_rule.c

…

devfs_vfsops.c

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devfs_vnops.c

devfs: make persistent controlling terminal an ABI property

2026-10-20 20:38:09 +03:00

devfs.h

…