Re: 23.0.50; source of warning in *shell* buffer

[Andreas Schwab]

Peter Dyballa <address@hidden> writes:

> When I invoke M-x shell the new buffer starts with:
>
>       Warning: no access to tty (Bad file descriptor).
>       Thus no job control in this shell.
>
> Where is the source for these messages?

They are most likely coming from the shell.

> What are the criterions for this warning?

Probably the shell could not open /dev/tty, ie. it has no controlling
terminal.  That happens when the process is using pipes instead of ptys.

> Which elements are necessary for job control?

The shell needs to be able to manipulate the process group of the
controlling terminal.

Andreas.

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Andreas Schwab, SuSE Labs, address@hidden
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