It looks like the libc crate doesn't have mremap in the FreeBSD CI environment:

error[E0425]: cannot find function `mremap` in module `libc`
   --> src/sys/mman.rs:330:21
    |
330 |     let ret = libc::mremap(addr, old_size, new_size, flags.bits(), new_address);
    |                     ^^^^^^
help: a function with a similar name exists
    |
330 |     let ret = libc::mmap(addr, old_size, new_size, flags.bits(), new_address);
    |                     ^^^^
help: possible candidate is found in another module, you can import it into scope
    |
1   | use crate::sys::mman::mremap;
    |

I assume I need to config-guard this wrapper, but I'm not sure how to tell which configs ought to include it. I don't see any such config-guard in the libc crate itself: https://docs.rs/libc/0.2.68/src/libc/unix/linux_like/linux/mod.rs.html#2910

Any ideas?

I assume I need to config-guard this wrapper, but I'm not sure how to tell which configs ought to include it. I don't see any such config-guard in the libc crate itself: https://docs.rs/libc/0.2.68/src/libc/unix/linux_like/linux/mod.rs.html#2910

Added a guard to make it Linux-only, since the man page notes that it's Linux-specific.

Hmm, I'm fairly certain the CI failure is spurious. It doesn't look related to this PR, and it previously passed on 7a46b52, which should be exactly the same.

I'm happy to rerun if desired; is there a nicer way to force a rerun than pushing an empty commit?

Looks good. Now it just needs a squash.

Looks good. Now it just needs a squash.

Done

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Build succeeded:

• continuous-integration/travis-ci/push
• FreeBSD 11.4