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use std::mem;
use std::os::unix::io::RawFd;
use std::option::Option;
use libc::{self, c_int, c_void};
use {Errno, Error, Result};
use ::unistd::Pid;
// For some functions taking with a parameter of type CloneFlags,
// only a subset of these flags have an effect.
libc_bitflags!{
pub flags CloneFlags: libc::c_int {
CLONE_VM,
CLONE_FS,
CLONE_FILES,
CLONE_SIGHAND,
CLONE_PTRACE,
CLONE_VFORK,
CLONE_PARENT,
CLONE_THREAD,
CLONE_NEWNS,
CLONE_SYSVSEM,
CLONE_SETTLS,
CLONE_PARENT_SETTID,
CLONE_CHILD_CLEARTID,
CLONE_DETACHED,
CLONE_UNTRACED,
CLONE_CHILD_SETTID,
CLONE_NEWCGROUP,
CLONE_NEWUTS,
CLONE_NEWIPC,
CLONE_NEWUSER,
CLONE_NEWPID,
CLONE_NEWNET,
CLONE_IO,
}
}
pub type CloneCb<'a> = Box<FnMut() -> isize + 'a>;
#[repr(C)]
#[derive(Clone, Copy)]
pub struct CpuSet {
cpu_set: libc::cpu_set_t,
}
impl CpuSet {
pub fn new() -> CpuSet {
CpuSet { cpu_set: unsafe { mem::zeroed() } }
}
pub fn is_set(&self, field: usize) -> Result<bool> {
if field >= 8 * mem::size_of::<libc::cpu_set_t>() {
Err(Error::Sys(Errno::EINVAL))
} else {
Ok(unsafe { libc::CPU_ISSET(field, &self.cpu_set) })
}
}
pub fn set(&mut self, field: usize) -> Result<()> {
if field >= 8 * mem::size_of::<libc::cpu_set_t>() {
Err(Error::Sys(Errno::EINVAL))
} else {
Ok(unsafe { libc::CPU_SET(field, &mut self.cpu_set) })
}
}
pub fn unset(&mut self, field: usize) -> Result<()> {
if field >= 8 * mem::size_of::<libc::cpu_set_t>() {
Err(Error::Sys(Errno::EINVAL))
} else {
Ok(unsafe { libc::CPU_CLR(field, &mut self.cpu_set) })
}
}
}
mod ffi {
use libc::{c_void, c_int};
pub type CloneCb = extern "C" fn(data: *const super::CloneCb) -> c_int;
// We cannot give a proper #[repr(C)] to super::CloneCb
#[allow(improper_ctypes)]
extern "C" {
// 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: c_int,
arg: *mut super::CloneCb,
...)
-> c_int;
}
}
pub fn sched_setaffinity(pid: Pid, cpuset: &CpuSet) -> Result<()> {
let res = unsafe {
libc::sched_setaffinity(pid.into(),
mem::size_of::<CpuSet>() as libc::size_t,
mem::transmute(cpuset))
};
Errno::result(res).map(drop)
}
pub fn clone(mut cb: CloneCb,
stack: &mut [u8],
flags: CloneFlags,
signal: Option<c_int>)
-> Result<Pid> {
extern "C" fn callback(data: *mut CloneCb) -> c_int {
let cb: &mut CloneCb = unsafe { &mut *data };
(*cb)() as c_int
}
let res = unsafe {
let combined = flags.bits() | signal.unwrap_or(0);
let ptr = stack.as_mut_ptr().offset(stack.len() as isize);
let ptr_aligned = ptr.offset((ptr as usize % 16) as isize * -1);
ffi::clone(mem::transmute(callback as extern "C" fn(*mut Box<::std::ops::FnMut() -> isize>) -> i32),
ptr_aligned as *mut c_void,
combined,
&mut cb)
};
Errno::result(res).map(Pid::from_raw)
}
pub fn unshare(flags: CloneFlags) -> Result<()> {
let res = unsafe { libc::unshare(flags.bits()) };
Errno::result(res).map(drop)
}
pub fn setns(fd: RawFd, nstype: CloneFlags) -> Result<()> {
let res = unsafe { libc::setns(fd, nstype.bits()) };
Errno::result(res).map(drop)
}
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