Create a new submodule within `memory`, `allocators` which contains all
memory allocators. Also split out the `Frame` struct from the `pg_alloc`
module, allowing it to be used by other modules.
The `sys_clock_nanosleep` implementation was missing a `flags` parameter
in the second position. This meant that `rqtp` was interpreted as
`rmtp`, and when interrupted, `rmtp` would write to a garbage address
causing an `EFAULT`.
Fix the argument ordering.
Poll the wrapped future first, ensuring that the interrupt logic doesn't
short-circuit a future which is already ready.
This fixes an issue where `sys_wait4` would return `-EINTR` when
receiving a `SIGCHLD`. Since `SIGCHLD` indicates the wait condition
is met, the underlying future is ready and should return the PID
successfully rather than aborting.
Allow the `nanosleep` family of functions to be interrupted. When an
interruption occures, calculation the remaining duration and write that
back to user-space.
Add a test to ensure proper functionality into usertest.
Add a new struct, `InterruptableFut` which allows signal
short-circuiting logic. If a future within the kernel's syscall logic is
wrapped in a `InterruptableFut`, then a wakeup with any pending signals
causes the underlying future to be dropped and it's operation cancelled.
Provide a `InterruptResult` enum to allow the caller to know whether the
operation was interrupted and allows them to take appropriate action.
Typically exiting with `-EINTR`.
Finally, provide a blanket implementation for all futures, allowing then
to call `.interruptable()` to easily wrap any future.
Currently we close CLOEXEC FDs when we call `clone()` when making a copy
of the file descriptor table. Defer this until the `exec` syscall.
This fixes numerous bugs, namely with bash and setting the foreground
process group for the current TTY.
When calling `clone()` with PTRACE_O_TRACEFORK set, make the child
inherit the current ptrace context. Also start the process with SIGSTOP
pending as per the ptrace docs.
This enable strace follow-forks functionality `strace -f`.
We currently union the UNMASKABLE_SIGNALS set with the new signal mask.
This does the complete opposite of what we wnat, we want to *remove*
those signals from the newly computed signal mask.
This patch removes the UNMASKABLE_SIGNALS set from any newly computed
signal mask.
Make it such that when a ptrace event is hit:
- The current regset is saved in the ptrace state.
- The current task is put to sleep.
- Arrange for a SIGCHLD to be set to the parent.
- Notify any waiters with the appopriate signal.
This commit refactors the signal handling subsystem to address a bug in
process creation and to improve the separation of concerns between
signal delivery and signal disposition.
1. Fix Action Table Sharing:
Previously, the signal action table was wrapped in an `Arc`, causing
forked child processes to inadvertently share signal dispositions with
the parent. `SignalActionState` now contains a direct `SigActionSet` and
implements Clone, ensuring that processes receive a private copy of the
action table upon fork/clone.
2. Decouple Signal Selection from Execution:
The logic for selecting a pending signal has been moved from the
disposition state into a new `take_signal` method on `OwnedTask`. This
decouples the "taking" of a signal (respecting masks and priorities)
from the "actioning" of that signal. This is a prerequisite for
implementing ptrace.
3. Various cleanup bits:
- Renamed `SignalState` to `SignalActionState` to more accurately
reflect that it manages signal dispositions.
- Removed the `pending` signal set out of the action state and directly
into the `ThreadGroup` and `OwnedTask`.
- Renamed `set_pending` to `set_signal` for consistency.
- Simplified the signal delivery loop in `dispatch_userspace_task`
using the new `take_signal` API.
Implement FUTEX_{WAKE,WAIT}_BITSET by using a `u32` as a data
discriminant value.
Also add a bunch of tests to `usertest` to ensure proper functionality.
