Jef Driesen fab606b00a Add an option to enable support for pseudo terminals.
Pseudo terminals are very convenient for testing purposes, but they are
not fully compatible with real serial (or even usb-serial) hardware.
With the new option, some workarounds can be enabled to hide the
differences and increase compatibility. Although these workarounds
shouldn't cause any problems in production builds, the advise is to
disable this feature.

A few ioctl's are not supported for pseudo terminals. They fail with
EINVAL (Linux) or ENOTTY (Mac OS X). Since these specific error codes
should not occur under normal conditions, they are simply ignored when
pseudo terminal support is enabled.

The TIOCEXCL ioctl (exclusive access) is also problematic. The TIOCEXCL
setting is shared between the master and slave side of the pty. When the
setting is applied on the slave side, it persists for as long as the
master side remains open. The result is that re-opening the slave side
will fail with EBUSY, unless the process has root priviliges. Since this
is very inconvenient, the TIOCEXCL setting is not used when pseudo
terminal support is enabled.
2012-08-28 23:30:43 +02:00
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2012-06-21 21:39:24 +02:00
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