Function clone

pub unsafe fn clone(
    cb: CloneCb<'_>,
    stack: &mut [u8],
    flags: CloneFlags,
    signal: Option<c_int>,
) -> Result<Pid>

clone create a child process (clone(2))

stack is a reference to an array which will hold the stack of the new process. Unlike when calling clone(2) from C, the provided stack address need not be the highest address of the region. Nix will take care of that requirement. The user only needs to provide a reference to a normally allocated buffer.

Safety

Because clone creates a child process with its stack located in stack without specifying the size of the stack, special care must be taken to ensure that the child process does not overflow the provided stack space.

See fork for additional safety concerns related to executing child processes.