Bug 82296
| Summary: | ttys(5) man page misleads about use for non-getty processes | ||
|---|---|---|---|
| Product: | Documentation | Reporter: | Chris Lightfoot <chris> |
| Component: | Books & Articles | Assignee: | freebsd-doc (Nobody) <doc> |
| Status: | Closed FIXED | ||
| Severity: | Affects Only Me | ||
| Priority: | Normal | ||
| Version: | Latest | ||
| Hardware: | Any | ||
| OS: | Any | ||
On 2005-06-15 21:44, Chris Lightfoot <chris@ex-parrot.com> wrote: > The ttys(5) man page states in respect of each line of /etc/ttys, > > The first field is normally the name of the terminal special file as it > is found in /dev. However, it can be any arbitrary string when the asso- > ciated command is not related to a tty. > > However, this is not true -- the new_session command in init.c will > drop any /etc/ttys line whose first field does not give the name of a > file in /dev which can be opened: (line 937 et seq) Is this still true on the 5.X branch? I've just tested on CURRENT and the following entry worked as expected, even though I certainly don't have a /dev/nproc device node: nproc "/root/script" unknown on secure On Sat, Apr 08, 2006 at 12:09:32AM +0300, Giorgos Keramidas wrote:
> On 2005-06-15 21:44, Chris Lightfoot <chris@ex-parrot.com> wrote:
> > The ttys(5) man page states in respect of each line of /etc/ttys,
> >
> > The first field is normally the name of the terminal special file as it
> > is found in /dev. However, it can be any arbitrary string when the asso-
> > ciated command is not related to a tty.
> >
> > However, this is not true -- the new_session command in init.c will
> > drop any /etc/ttys line whose first field does not give the name of a
> > file in /dev which can be opened: (line 937 et seq)
>
> Is this still true on the 5.X branch? I've just tested on CURRENT and
> the following entry worked as expected, even though I certainly don't
> have a /dev/nproc device node:
>
> nproc "/root/script" unknown on secure
hmm. The machine where I encountered the problem is
5.2.1-RELEASE. I haven't tried on anything subsequent.
--
``Ashford Skiing Club is cancelled this evening due to the snow.''
(allegedly heard on local radio in Kent)
On 2006-04-08 18:28, Chris Lightfoot <chris@ex-parrot.com> wrote: >On Sat, Apr 08, 2006 at 12:09:32AM +0300, Giorgos Keramidas wrote: >>On 2005-06-15 21:44, Chris Lightfoot <chris@ex-parrot.com> wrote: >>> The ttys(5) man page states in respect of each line of /etc/ttys, >>> >>> The first field is normally the name of the terminal special file as it >>> is found in /dev. However, it can be any arbitrary string when the asso- >>> ciated command is not related to a tty. >>> >>> However, this is not true -- the new_session command in init.c will >>> drop any /etc/ttys line whose first field does not give the name of a >>> file in /dev which can be opened: (line 937 et seq) >> >> Is this still true on the 5.X branch? I've just tested on CURRENT and >> the following entry worked as expected, even though I certainly don't >> have a /dev/nproc device node: >> >> nproc "/root/script" unknown on secure > > hmm. The machine where I encountered the problem is > 5.2.1-RELEASE. I haven't tried on anything subsequent. Good enough. Thanks for following up so fast. I believe 5.2.1-RELEASE was a developer-preview release, and many things have changed since then. If you (or anyone else, for that matter) test this with a newer release, i.e. 5-STABLE or one of the 6.X series, please let me know with a followup :-) - Giorgos State Changed From-To: open->feedback The problem was only observed in 5.2.1. I tried a newer build and things seem to work as documented in ttys(5). Set this PR to 'feedback', until we receive information about a newer build/release of FreeBSD or it times out as isnormal for feedback PRs. State Changed From-To: feedback->closed It's been long fixed (see rev. 1.59 of init.c in HEAD). |
The ttys(5) man page states in respect of each line of /etc/ttys, The first field is normally the name of the terminal special file as it is found in /dev. However, it can be any arbitrary string when the asso- ciated command is not related to a tty. However, this is not true -- the new_session command in init.c will drop any /etc/ttys line whose first field does not give the name of a file in /dev which can be opened: (line 937 et seq) /* * Attempt to open the device, if we get "device not configured" * then don't add the device to the session list. */ if ((fd = open(sp->se_device, O_RDONLY | O_NONBLOCK, 0)) < 0) { if (errno == ENXIO || errno == ENOENT) { free_session(sp); return (0); } } else close(fd); The same error is present in ttys(5) in the 5.4-RC2 release in respect of the init source code on that release. Fix: Change the man page or the code in init.c. The latter looks harder since I don't think init.c knows whether a given line refers to a getty process or not. How-To-Repeat: Obey advice of man page to run a non-getty process from init; observe that it doesn't work.