Hi everyone,
(I apologize if this is not the right mailing list for this; if not,
please point me to the right direction).
At a high level, I am trying to get the file descriptor for a file I
am opening -- the reason for this is I want to pass it on to ioctl
later on. I am trying two approaches here:
1. Use libc FFI, and create and pass around a sys::fs::FileDesc. This
worked until today, when I updated to latest rustc (using rustup).
Now, trying to compile, gives me "unresolved import
`sys::fs::FileDesc`. Maybe a missing `extern crate sys`?". (and extern
does not work, can't find crate).
Looking in the rust-lang source, however, I see it being used (and
being imported) exactly as I do above (e.g.,
libstd/sys/unix/{helper_signal.rs, process.rs}). So, what's going on?
2. (Try to) Use regular, rust-y std::io::{File, Open, ReadWrite}, and
try to use the `as_fd()` method on the `File` result I get from open.
This is somewhat undocumented, but I came across the method in fs.rs
source [1] (I think I intuitively understand what
`sys_common::AsFileDesc` means in `impl sys_common::AsFileDesc for
File`), and I then saw that process.rs actually uses it, of course
after doing `use sys_common::{AsFileDesc}` at the beginning, as my
intuition suggested. Still though, I get a similar error to (1) above,
i.e., `unresolved import `sys_common::AsFileDesc`. Maybe a missing
`extern crate sys_common`?` What's going on here?
What doesn't any of these imports work? Also, where is the
`sys_common` documented? And, most importantly, how do I get to play
with file descriptors, without implementing the abstraction myself (in
the case of (1), for instance)?
Thanks!
Nikos
[1]
http://doc.rust-lang.org/src/std/home/rustbuild/src/rust-buildbot/slave/nightly-linux/build/src/libstd/io/fs.rs.html#91-95
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