implement ttyname and ttyname_r #1259
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doy
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(i'd really like to see this change, but i don't have access to a dev machine with osx - is there a way forward here?) |
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Apart from the inline comments, this change looks good. As for the OSX test failure, I can't help you because I don't have an OSX machine, either. Try to borrow a friend's if possible. If not, then you might try "debugging-through-travis" at least to see the exact errno, and the output of isatty(fd.as_raw_fd()).
Finally, if all else fails, my belief is that proprietary operating systems are supported on a "best-effort" basis, and you can disable the function on OSX.
src/unistd.rs
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| /// function is marked as `unsafe` to reflect that. | ||
| /// | ||
| /// For a threadsafe and non-`unsafe` alternative, see `ttyname_r()`. | ||
| #[inline] |
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Don't use #[inline] for new code. The compiler can figure it out, at least when LTO is enabled.
| return Err(Error::Sys(Errno::last())); | ||
| } | ||
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| let nul = buf.iter().position(|c| *c == b'\0').unwrap(); |
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Instead of manually searching for NUL, why not just use CStr::from_ptr? In fact, you should technically be using OsString here instead of CString, because the string comes from the operating system and not from another programming language. So you should declare the buf as a Vec, and then use OsString::from_vec followed by to_string_lossy.
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i think returning a PathBuf is actually better than String here, and using OsString for that makes sense. that does mean that i do have to still search for the nul myself though, since OsString won't do that (it'll just create a string with a bunch of trailing nuls). going through CStr (and then being forced to allocate a copy into a second Vec) doesn't seem worth it to avoid that?
src/unistd.rs
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| /// | ||
| /// For a threadsafe and non-`unsafe` alternative, see `ttyname_r()`. | ||
| #[inline] | ||
| pub unsafe fn ttyname(fd: RawFd) -> Result<String> { |
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Is there a good reason why anybody would ever want ttyname? Since the invention of ttyname_r, I think the latter should be used in all cases. If you don't know of a use case where ttyname_r does not suffice, then I'd just as soon we don't bind ttyname at all.
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yeah, good point - i was mainly copying from the ptsname interface, but i agree that it's really not necessary.
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alright, i'll play around with travis some more. |
doy
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looks like it was just an issue with the way i was structuring the test - |
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The powerpc64 build has only been failing for a few days, and it's fixed on Nix's master branch. You'll have to rebase. |
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done |
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Merge conflict. |
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rebased again |
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test_aio_drop also seems flaky https://travis-ci.org/github/nix-rust/nix/jobs/704771690 |
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Build succeeded: |
this fixes #1204.
i know this at least works on linux, but i'm not super sure about other platforms - happy to add conditionals if it makes sense.