nc 0.9.7

Access system calls directly
Documentation 
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/// Controls signals blocking with a simple memory write
pub unsafe fn sigfastblock(cmd: i32, ptr: *mut u32) -> Result<(), Errno> {
    let cmd = cmd as usize;
    let ptr = ptr as usize;
    syscall2(SYS_SIGFASTBLOCK, cmd, ptr).map(drop)
}