> You're right. ``tcsetattr'' doesn't affect the ``TOSTOP'' flag, but it
> sends a SIGTTOU, when invoked from a background process. This, in
> turn, causes the process to suspend unless SIGTTOU is blocked or
> ignored!
>
> SUSv2 says, this is the correct behaviour:
> http://www.opennc.org/onlinepubs/007908799/xsh/tcsetattr.html:
> [...]
> Attempts to use tcsetattr() from a process which is a member
> of a background process group on a fildes associated with its
> controlling terminal, will cause the process group to be sent
> a SIGTTOU signal. If the calling process is blocking or
> ignoring SIGTTOU signals, the process is allowed to perform
> the operation, and no signal is sent.
> [...]
Thanks Michael. The Solaris man page has this exact same paragraph,
although I can find no mention of this behaviour in the POSIX book I
have, the Linux man pages (surprise :-) or the Glibc docs.
FreeBSD termios(4) has this:
Certain calls that set terminal parameters are treated in the
same fashion as write, except that TOSTOP is ignored; that is,
the effect is identical to that of terminal writes when TOSTOP
is set.
which makes a lot more sense.
I guess it's another one of those dark corners that Volker seems to
wonder into with alarming regularity :)
Cheers,
Simon
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