nc 0.9.7

Access system calls directly
Documentation 
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/// Get the effective user ID of the calling process.
///
/// # Examples
///
/// ```
/// let euid = unsafe { nc::geteuid() };
/// assert!(euid > 0);
/// ```
#[must_use]
pub unsafe fn geteuid() -> uid_t {
    // This function is always successful.
    syscall0(SYS_GETEUID).unwrap_or_default() as uid_t
}