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#![cfg(target_os = "linux")]
use std::mem;
use libc::{c_int, c_uint, c_void};
use super::{SysResult, SysError};
pub type CloneFlags = c_uint;
pub static CLONE_VM: CloneFlags = 0x00000100;
pub static CLONE_FS: CloneFlags = 0x00000200;
pub static CLONE_FILES: CloneFlags = 0x00000400;
pub static CLONE_SIGHAND: CloneFlags = 0x00000800;
pub static CLONE_PTRACE: CloneFlags = 0x00002000;
pub static CLONE_VFORK: CloneFlags = 0x00004000;
pub static CLONE_PARENT: CloneFlags = 0x00008000;
pub static CLONE_THREAD: CloneFlags = 0x00010000;
pub static CLONE_NEWNS: CloneFlags = 0x00020000;
pub static CLONE_SYSVSEM: CloneFlags = 0x00040000;
pub static CLONE_SETTLS: CloneFlags = 0x00080000;
pub static CLONE_PARENT_SETTID: CloneFlags = 0x00100000;
pub static CLONE_CHILD_CLEARTID: CloneFlags = 0x00200000;
pub static CLONE_DETACHED: CloneFlags = 0x00400000;
pub static CLONE_UNTRACED: CloneFlags = 0x00800000;
pub static CLONE_CHILD_SETTID: CloneFlags = 0x01000000;
pub static CLONE_NEWUTS: CloneFlags = 0x04000000;
pub static CLONE_NEWIPC: CloneFlags = 0x08000000;
pub static CLONE_NEWUSER: CloneFlags = 0x10000000;
pub static CLONE_NEWPID: CloneFlags = 0x20000000;
pub static CLONE_NEWNET: CloneFlags = 0x40000000;
pub static CLONE_IO: CloneFlags = 0x80000000;
pub type CloneCb<'a> = ||:'a -> int;
mod ffi {
use libc::{c_void, c_int};
type CloneCb = extern "C" fn (data: *const super::CloneCb) -> c_int;
extern {
// create a child process
// doc: http://man7.org/linux/man-pages/man2/clone.2.html
pub fn clone(
cb: *const CloneCb,
child_stack: *mut c_void,
flags: super::CloneFlags,
arg: *mut super::CloneCb,
...) -> c_int;
// disassociate parts of the process execution context
// doc: http://man7.org/linux/man-pages/man2/unshare.2.html
pub fn unshare(flags: super::CloneFlags) -> c_int;
}
}
pub fn clone(mut cb: CloneCb, stack: &mut [u8], flags: CloneFlags) -> SysResult<()> {
extern "C" fn callback(data: *mut CloneCb) -> c_int {
let cb: &mut CloneCb = unsafe { &mut *data };
(*cb)() as c_int
}
let res = unsafe {
let ptr = stack.as_mut_ptr().offset(stack.len() as int);
ffi::clone(mem::transmute(callback), ptr as *mut c_void, flags, &mut cb)
};
if res != 0 {
return Err(SysError::last());
}
Ok(())
}
pub fn unshare(flags: CloneFlags) -> SysResult<()> {
let res = unsafe { ffi::unshare(flags) };
if res != 0 {
return Err(SysError::last());
}
Ok(())
}
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