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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 {Error, Result};
use errno::Errno;
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 struct CloneFlags: 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)]
#[allow(missing_debug_implementations)]
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) })
}
}
}
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,
&cpuset.cpu_set)
};
Errno::result(res).map(drop)
}
/// Explicitly yield the processor to other threads.
///
/// [Further reading](http://pubs.opengroup.org/onlinepubs/9699919799/functions/sched_yield.html)
pub fn sched_yield() -> Result<()> {
let res = unsafe {
libc::sched_yield()
};
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);
libc::clone(mem::transmute(callback as extern "C" fn(*mut Box<::std::ops::FnMut() -> isize>) -> i32),
ptr_aligned as *mut c_void,
combined,
&mut cb as *mut _ as *mut c_void)
};
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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