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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