nc 0.8.13

Access system calls directly
Documentation 
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/// Get the real user ID of the calling process.
///
/// # Example
///
/// ```
/// let uid = unsafe { nc::getuid() };
/// assert!(uid > 0);
/// ```
#[must_use]
pub unsafe fn getuid() -> uid_t {
    // This function is always successful.
    syscall0(SYS_GETUID).expect("getuid() failed") as uid_t
}