use std::mem; use libc::{c_int, c_uint, c_void, c_ulong}; use errno::Errno; use {Result, Error}; 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; // Support a maximum CPU set of 1024 nodes #[cfg(all(target_arch = "x86_64", target_os = "linux"))] mod cpuset_attribs { use super::CpuMask; pub const CPU_SETSIZE: usize = 1024; pub const CPU_MASK_BITS: usize = 64; #[inline] pub fn set_cpu_mask_flag(cur: CpuMask, bit: usize) -> CpuMask { cur | (1u64 << bit) } #[inline] pub fn clear_cpu_mask_flag(cur: CpuMask, bit: usize) -> CpuMask { cur & !(1u64 << bit) } } #[cfg(all(target_arch = "x86", target_os = "linux"))] mod cpuset_attribs { use super::CpuMask; pub const CPU_SETSIZE: usize = 1024; pub const CPU_MASK_BITS: usize = 32; #[inline] pub fn set_cpu_mask_flag(cur: CpuMask, bit: usize) -> CpuMask { cur | (1u32 << bit) } #[inline] pub fn clear_cpu_mask_flag(cur: CpuMask, bit: usize) -> CpuMask { cur & !(1u32 << bit) } } #[cfg(all(target_arch = "arm", any(target_os = "linux", target_os = "android")))] mod cpuset_attribs { use super::CpuMask; // bionic only supports up to 32 independent CPUs, instead of 1024. pub const CPU_SETSIZE: usize = 32; pub const CPU_MASK_BITS: usize = 32; #[inline] pub fn set_cpu_mask_flag(cur: CpuMask, bit: usize) -> CpuMask { cur | (1u32 << bit) } #[inline] pub fn clear_cpu_mask_flag(cur: CpuMask, bit: usize) -> CpuMask { cur & !(1u32 << bit) } } pub type CloneCb<'a> = Box isize + 'a>; // A single CPU mask word pub type CpuMask = c_ulong; // Structure representing the CPU set to apply #[repr(C)] #[derive(Clone, Copy)] pub struct CpuSet { cpu_mask: [CpuMask; cpuset_attribs::CPU_SETSIZE/cpuset_attribs::CPU_MASK_BITS] } impl CpuSet { pub fn new() -> CpuSet { CpuSet { cpu_mask: unsafe { mem::zeroed() } } } pub fn set(&mut self, field: usize) { let word = field / cpuset_attribs::CPU_MASK_BITS; let bit = field % cpuset_attribs::CPU_MASK_BITS; self.cpu_mask[word] = cpuset_attribs::set_cpu_mask_flag(self.cpu_mask[word], bit); } pub fn unset(&mut self, field: usize) { let word = field / cpuset_attribs::CPU_MASK_BITS; let bit = field % cpuset_attribs::CPU_MASK_BITS; self.cpu_mask[word] = cpuset_attribs::clear_cpu_mask_flag(self.cpu_mask[word], bit); } } mod ffi { use libc::{c_void, c_int, pid_t, size_t}; use super::CpuSet; 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 { // 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; // Set the current CPU set that a task is allowed to run on pub fn sched_setaffinity(__pid: pid_t, __cpusetsize: size_t, __cpuset: *const CpuSet) -> c_int; } } pub fn sched_setaffinity(pid: isize, cpuset: &CpuSet) -> Result<()> { use libc::{pid_t, size_t}; let res = unsafe { ffi::sched_setaffinity(pid as pid_t, mem::size_of::() as size_t, mem::transmute(cpuset)) }; if res != 0 { Err(Error::Sys(Errno::last())) } else { Ok(()) } } pub fn clone(mut cb: CloneCb, stack: &mut [u8], flags: CloneFlags) -> Result<()> { 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 isize); ffi::clone(mem::transmute(callback), ptr as *mut c_void, flags, &mut cb) }; if res != 0 { return Err(Error::Sys(Errno::last())); } Ok(()) } pub fn unshare(flags: CloneFlags) -> Result<()> { let res = unsafe { ffi::unshare(flags) }; if res != 0 { return Err(Error::Sys(Errno::last())); } Ok(()) }