eventfd() unsigned int

[MarkSwanson]

In Linux note 'man 2 eventfd'.
int eventfd(unsigned int initval, int flags);

You'll see this is incorrectly defined here:
src/unix/notbsd/linux/other/mod.rs

(the bug is that c_int should be c_uint)

[jimblandy]

From the pull request:

It turns out that eventfd's first argument is unsigned on Fedora (glibc), but int on Ubuntu (eglibc). Note the delightful contrast between Ubuntu's code and Ubuntu's man pages. (The CI logs tell me Trusty is the Ubuntu that Travis is using.)

[MarkSwanson]

Oh my!
How delightful indeed! :-)