TIOCMIWAIT hopelessly broken?

TIOCMIWAIT hopelessly broken?

[Adam Goode]

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Hi,

The ioctl TIOCMIWAIT seems to be inadequate for tracking changes in the
modem status lines. The main problem is that it cannot be used without
racing: if the status change you are waiting for happens before your
ioctl, you will wait forever.

A solution would be one like a eventfd, something that can be put to
poll(), epoll(), or select(), and where you read the status changes with
read().

Any ideas on how to do this? Would it be a new syscall, something in
/sys, a flag to open() ?


Thanks,

Adam


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