Ioctl capacity query

1

Can anyone help me construct a call to ioctl ! ioctl to accomplish the below Linux Call?

The following ioctl(2) operation, which can be applied to a file descriptor that refers to either end of a pipe, places a count of the number of unread bytes in the pipe in the int buffer pointed to by the final argument of the call: ioctl(fd, FIONREAD, &nbytes); The FIONREAD operation is not specified in any standard, but is provided on many implementations.

2

You can use the libc crate. It provides both the ioctl function and the FIONREAD constant.

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4

Is there a way to get the "File" that is wrapped in a LineWriter?

5

You can use into_inner on a LineWriter<File> (as per the example).

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6

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