libc 0.2.80

Raw FFI bindings to platform libraries like libc.
Documentation 
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pub type c_char = u8;
pub type c_long = i64;
pub type c_ulong = u64;
pub type wchar_t = u32;
pub type time_t = i64;
pub type suseconds_t = i64;
pub type register_t = i64;

// should be pub(crate), but that requires Rust 1.18.0
cfg_if! {
    if #[cfg(libc_const_size_of)] {
        #[doc(hidden)]
        pub const _ALIGNBYTES: usize = ::mem::size_of::<::c_longlong>() - 1;
    } else {
        #[doc(hidden)]
        pub const _ALIGNBYTES: usize = 8 - 1;
    }
}

pub const MAP_32BIT: ::c_int = 0x00080000;
pub const MINSIGSTKSZ: ::size_t = 4096; // 1024 * 4