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use std::mem;
use nix::{errno, sched, unistd};
#[repr(C)]
#[derive(Debug, Default)]
struct CloneArgs {
flags: u64,
pidfd: u64,
child_tid: u64,
parent_tid: u64,
exit_signal: u64,
stack: u64,
stack_size: u64,
tls: u64,
}
pub unsafe fn clone(flags: sched::CloneFlags) -> nix::Result<unistd::ForkResult> {
let mut args = CloneArgs {
flags: flags.bits() as u64,
exit_signal: libc::SIGCHLD as u64,
..CloneArgs::default()
};
let size = mem::size_of_val(&args) as libc::size_t;
let pid = libc::syscall(libc::SYS_clone3, &mut args, size);
if pid < 0 {
Err(errno::Errno::last())
} else if pid == 0 {
Ok(unistd::ForkResult::Child)
} else {
Ok(unistd::ForkResult::Parent {
child: unistd::Pid::from_raw(pid as libc::pid_t),
})
}
}
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