crabc-libc 0.7.6

A Rust no_std musl-compatible libc implementation
Documentation 
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// syscall() - variadic syscall forwarding, musl-compatible.
// Add to libc/src/lib.rs in the "syscall wrappers" section.
// Matches musl x86_64 convention: rax=num, rdi,rsi,rdx,r10,r8,r9; rcx,r11 clobbered.

#[no_mangle]
pub unsafe extern "C" fn syscall(num: c_long, mut args: ...) -> c_long {
    let a: c_long = args.next_arg();
    let b: c_long = args.next_arg();
    let c: c_long = args.next_arg();
    let d: c_long = args.next_arg();
    let e: c_long = args.next_arg();
    let f: c_long = args.next_arg();

    let result = <Arch as Syscalls>::syscall6(
        num as i64, a as i64, b as i64, c as i64, d as i64, e as i64, f as i64,
    );

    if (result as u64) > (-4096i64 as u64) {
        ERRNO!() = (-result) as c_int;
        return -1;
    }
    result as c_long
}