Macro syscalls::raw_syscall

macro_rules! raw_syscall {
    ($nr:expr) => { ... };
    ($nr:expr, $a1:expr) => { ... };
    ($nr:expr, $a1:expr, $a2:expr) => { ... };
    ($nr:expr, $a1:expr, $a2:expr, $a3:expr) => { ... };
    ($nr:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr) => { ... };
    ($nr:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr) => { ... };
    ($nr:expr, $a1:expr, $a2:expr, $a3:expr, $a4:expr, $a5:expr, $a6:expr) => { ... };
}

Performs a raw syscall and returns a usize. Use syscall if you wish to get a Result as a return value.

Accepts a syscall number and a variable number of arguments (0 to 6).

Example

use syscalls::{Sysno, raw_syscall};

// gettid is guaranteed to never fail, so we don't need a `Result` return
// value.
let tid = unsafe { raw_syscall!(Sysno::gettid) };
println!("My thread ID is {}", tid);