Change sigTTOU/TTIN to IGNORE by default

[Michael Weber]

* Michael Weber <michael.weber at post.rwth-aachen.de> [2001-01-16T00:00+0100]:
[...]
> So, a solution seems to be, to block SIGTTOU during the call of
> tcsetattr
[...]

BTW: Eventually, the following functions need the same shielding:

	tcsetattr, tcsendbreak, tcflow, tcflush


Cheers,
M/
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