dragonflybsd: expose waitid() prototype + related constants

[cmusser]

This exposes the POSIX waitid() process management function and some related defined constants for dragonflybsd. It includes one correction: WSTOPPED which previously had the wrong value. Noticed this when a crate that depended on it, process_control, wouldn't compile on this platform.

[rust-highfive]

r? @Amanieu

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[Amanieu]

@bors r+

[bors]

📌 Commit 6bfee3c has been approved by Amanieu

[bors]

⌛ Testing commit 6bfee3c with merge a49576b...

[bors]

💔 Test failed - checks-actions

[Amanieu]

2021-03-03T01:18:36.6123268Z error: constant is never used: `WNOHANG`
2021-03-03T01:18:36.6125425Z    --> src/unix/bsd/freebsdlike/dragonfly/mod.rs:986:1
2021-03-03T01:18:36.6126225Z     |
2021-03-03T01:18:36.6127157Z 986 | pub const WNOHANG: ::c_int = 0x1;
2021-03-03T01:18:36.6127572Z     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2021-03-03T01:18:36.6127831Z     |
2021-03-03T01:18:36.6128278Z note: the lint level is defined here
2021-03-03T01:18:36.6129087Z    --> src/lib.rs:18:38
2021-03-03T01:18:36.6129678Z     |
2021-03-03T01:18:36.6130047Z 18  | #![cfg_attr(libc_deny_warnings, deny(warnings))]
2021-03-03T01:18:36.6130436Z     |                                      ^^^^^^^^
2021-03-03T01:18:36.6130867Z     = note: `#[deny(dead_code)]` implied by `#[deny(warnings)]`
2021-03-03T01:18:36.6131187Z 
2021-03-03T01:18:36.6131545Z error: constant is never used: `WUNTRACED`
2021-03-03T01:18:36.6132183Z    --> src/unix/bsd/freebsdlike/dragonfly/mod.rs:987:1
2021-03-03T01:18:36.6132584Z     |
2021-03-03T01:18:36.6132905Z 987 | pub const WUNTRACED: ::c_int = 0x2;
2021-03-03T01:18:36.6133290Z     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2021-03-03T01:18:36.6133466Z 
2021-03-03T01:18:36.6521873Z error: aborting due to 2 previous errors

[cmusser]

Oh, I missed that, unfortunately, but I can reproduce it here. If it's a pub const, why does it trip up if it's never used? I looked around for another constant (WEXITED) to see how it was used and I could only find its definition. How can it tell if something is used or not?

[JohnTitor]

@bors r+ squash

[bors]

📌 Commit 56c98cb has been approved by JohnTitor

[bors]

⌛ Testing commit 56c98cb with merge ec86e5f...

[bors]

☀️ Test successful - checks-actions, checks-cirrus-freebsd-11, checks-cirrus-freebsd-12, checks-cirrus-freebsd-13
Approved by: JohnTitor
Pushing ec86e5f to master...

[JohnTitor]

Merged on master, thanks!

[cmusser]

sure thing! thanks for the tip on fixing the PR