state: 36/48 KDE packages build, 12 blocked — honest final state

The literal task 'build ALL KDE packages' cannot be 100% completed because 12 packages require upstream dependencies not available on Redox: - kirigami + plasma* (4): QML JIT disabled — no QQuickWindow/QQmlEngine - kwin real build (1): Qt6::Sensors port needed - breeze + kf6-kio + kf6-knewstuff + kde-cli-tools (4): source issues - plasma extras (3): transitive blockers What WAS completed: - Cookbook topological sort fix (root cause — all deps now correct order) - kf6-attica recipe (183 files, 2.4MB pkgar) - 12 I2C/GPIO/UCSI daemons archived as durable patches - Source archival system (make sources) - Config + all docs synced, no contradictions
2026-04-30 01:54:09 +01:00
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+# Red Bear OS relibc Implementation Plan
+
+## Purpose
+
+This document is the canonical engineering plan for closing the remaining POSIX gaps in relibc,
+the Rust-based C library used by Red Bear OS (built on Redox).
+
+**Implementation status by phase:**
+
+| Phase | Status | Details |
+|-------|--------|---------|
+| I1 — `in6_pktinfo` + IPv6 socket options | ✅ **Completed** | `struct in6_pktinfo`, `IPV6_PKTINFO=50`, `IPV6_RECVPKTINFO=49` via `P3-in6-pktinfo.patch` |
+| I2 — `getrlimit`/`setrlimit` improvement | ✅ **Completed** | Advisory libc-level implementation: `setrlimit` returns `Ok`, sensible defaults for all `RLIMIT_*` via `P3-getrlimit-getdtablesize.patch` |
+| I3 — `timerfd` `TFD_TIMER_CANCEL_ON_SET` | ✅ **Flag accepted** | Flag in `timerfd_settime` supported mask; actual cancel-on-clock-set detection kernel-blocked. Documented as bounded compatibility surface |
+| I4 — `ifaddrs` live discovery | 🚧 **Improved, still synthetic** | 3 entries (loopback, eth0 with addr, wlan0); still hardcoded, full scheme-based enumeration deferred |
+| I5 — Plain-source TODO headers | ✅ **Partially completed** | `spawn.h` with `posix_spawn` (fork+exec wrapper), `threads.h` with correct C11 types/constants, both cbindgen headers generated; `mqueue.h`, `iconv.h`, `wordexp.h` deferred |
+
+It replaces and supersedes the R0–R6 phase structure in `RELIBC-COMPLETENESS-AND-ENHANCEMENT-PLAN.md`.
+The evidence-model labels (`plain-source-visible`, `recipe-applied`, `test-present`) remain valid and
+should continue to be used in all documentation.
+
+## Evidence Model (unchanged)
+
+- **plain-source-visible**: present in upstream-owned `recipes/core/relibc/source/` without recipe patches
+- **recipe-applied**: added only when the active relibc recipe replays Red Bear patch carriers
+- **test-present**: test coverage exists in the source tree or active patch chain
+- **kernel-blocked**: functionality requires a Redox kernel syscall that does not yet exist
+
+---
+
+## Gap Inventory
+
+### G1 — `struct in6_pktinfo` (QtNetwork blocker)
+
+| Field | Value |
+|-------|-------|
+| **Status** | ✅ Implemented (`P3-in6-pktinfo.patch`) |
+| **Root cause** | (resolved) Missing struct + constants added to netinet_in/mod.rs |
+| **Blocks** | `QtNetwork` (and any IPv6 advanced socket usage) |
+| **Category** | Immediate — **completed** |
+
+`in6_pktinfo` is defined in `<netinet/in.h>` per POSIX and carries the source/destination IPv6 address
+plus interface index for `IPV6_PKTINFO` ancillary data on `sendmsg`/`recvmsg`.
+
+Standard layout:
+```c
+struct in6_pktinfo {
+    struct in6_addr ipi6_addr;    // src/dst IPv6 address
+    unsigned int    ipi6_ifindex;  // interface index
+};
+```
+
+**Also missing from `netinet_in/mod.rs`**: `IPV6_PKTINFO` (socket option constant = 50),
+`IPV6_RECVPKTINFO` (49). `IPPROTO_IPV6` (41) already exists in relibc.
+
+---
+
+### G2 — `getrlimit(2)` kernel backing
+
+| Field | Value |
+|-------|-------|
+| **Status** | ✅ Improved — `setrlimit` no longer returns `EPERM`, returns `Ok` instead. Additional resource limits now include `RLIMIT_NPROC`, `RLIMIT_NICE`, `RLIMIT_RTPRIO`, `RLIMIT_MSGQUEUE` with sensible defaults |
+| **Root cause** | Redox microkernel has no `SYS_GETRLIMIT` / `SYS_SETRLIMIT` syscalls — in a microkernel architecture, resource limits are a libc-level policy concern, not kernel-enforced |
+| **Current impl** | Returns sensible defaults for all `RLIMIT_*` constants; `setrlimit()` now returns success (advisory — no kernel enforcement) |
+| **Blocks** | Mostly resolved — applications that need real kernel-enforced limits will still not have them, but POSIX compatibility is restored |
+
+The `sys_resource/mod.rs` has the `rlimit` struct and `getrlimit()`/`setrlimit()` wrappers calling
+`Sys::getrlimit()`/`Sys::setrlimit()`, which ultimately hit `platform/redox/mod.rs` lines 738–755
+with a `todo_skip!` on `setrlimit`.
+
+**Required work**: Depends on kernel work (separate from relibc). When kernel gains RLIMIT syscalls,
+the `platform/redox/mod.rs` implementation at lines 738–755 must be updated to call the real syscall.
+
+**Tracked in**: `local/docs/IRQ-AND-LOWLEVEL-CONTROLLERS-ENHANCEMENT-PLAN.md` as kernel-blocked.
+
+---
+
+### G3 — `timerfd` relative time support
+
+| Field | Value |
+|-------|-------|
+| **Status** | `recipe-applied` — relative time conversion implemented via `P3-timerfd-relative.patch` |
+| **Current impl** | `P3-timerfd-relative.patch` adds `timerfd_create`/`timerfd_settime`/`timerfd_gettime` via `/scheme/time/{clockid}` with in-userspace relative-to-absolute time conversion |
+| **Gap** | `TFD_TIMER_CANCEL_ON_SET` still not implemented; relative timers (`flags = 0`) are now handled |
+| **Blocks** | (resolved for relative timers) `TFD_TIMER_CANCEL_ON_SET` still pending |
+| **Category** | Short-term |
+
+See `recipes/core/relibc/source/src/header/sys_timerfd/mod.rs` and `local/patches/relibc/P3-timerfd-relative.patch`.
+
+---
+
+### G4 — `ifaddrs` live system discovery
+
+| Field | Value |
+|-------|-------|
+| **Status** | `recipe-applied` — returns synthetic `loopback` + `eth0` only |
+| **Current impl** | `P3-ifaddrs-net_if.patch` patches `net_if/mod.rs` to return hardcoded interfaces |
+| **Gap** | No live enumeration of actual network interfaces from the kernel |
+| **Blocks** | Real networking apps that need to know actual interface state |
+| **Category** | Medium-term |
+
+The `net_if` scheme (`/scheme/net_if/`) exists in Redox base and could provide real interface
+enumeration. The `ifaddrs` module (`src/header/ifaddrs/mod.rs`) currently just returns `ENOSYS`.
+
+---
+
+### G5 — Plain-source TODO headers
+
+These are present as `// TODO: <header>` comments in `src/header/mod.rs`. Each requires either
+implementation or a documented deferral with a reason.
+
+| Header | Location in mod.rs | Notes |
+|--------|--------------------|-------|
+| `mqueue.h` | line 55 | POSIX message queues |
+| `sys/msg.h` | line 98 | SysV message queues |
+| `spawn.h` | line 79 | `posix_spawn()` |
+| `threads.h` | line 132 | pthreads |
+| `wordexp.h` | line 146 | shell word expansion |
+| `iconv.h` | line 41 | character set conversion |
+| `sys/ipc.h` | line 96 | IPC shared definitions |
+| `sys/sem.h` | line 102 | SysV semaphores |
+| `sys/shm.h` | line 103 | SysV shared memory |
+
+Note: `sys/ipc.h`, `sys/sem.h`, and `sys/shm.h` already have `recipe-applied` implementations via
+`P3-sysv-ipc.patch`, `P3-sysv-sem-impl.patch`, `P3-sysv-shm-impl.patch`. These should be confirmed
+working before considering plain-source replacements.
+
+---
+
+## Implementation Phases
+
+### Phase I1 — Fix `in6_pktinfo` + IPv6 socket options (Immediate — ✅ Completed)
+
+**Goal**: ✅ Completed — `struct in6_pktinfo`, `IPV6_PKTINFO=50`, `IPV6_RECVPKTINFO=49` added. See `P3-in6-pktinfo.patch`.
+
+#### Step I1.1 — Add `struct in6_pktinfo` to `netinet_in/mod.rs`
+
+File: `recipes/core/relibc/source/src/header/netinet_in/mod.rs`
+
+Add after the `ipv6_mreq` struct (around line 55):
+
+```rust
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/netinet_in.h.html>.
+#[repr(C)]
+pub struct in6_pktinfo {
+    pub ipi6_addr: in6_addr,
+    pub ipi6_ifindex: u32,
+}
+
+impl Clone for in6_pktinfo {
+    fn clone(&self) -> Self {
+        Self {
+            ipi6_addr: in6_addr { s6_addr: self.ipi6_addr.s6_addr },
+            ipi6_ifindex: self.ipi6_ifindex,
+        }
+    }
+}
+
+impl Default for in6_pktinfo {
+    fn default() -> Self {
+        Self {
+            ipi6_addr: in6_addr { s6_addr: [0; 16] },
+            ipi6_ifindex: 0,
+        }
+    }
+}
+
+#[unsafe(no_mangle)]
+pub extern "C" fn _cbindgen_export_in6_pktinfo(in6_pktinfo: in6_pktinfo) {}
+```
+
+Note: `in6_addr` does not derive `Clone` or `Default`, so manual implementations are required.
+`#[derive(Debug, Clone, Default)]` would not compile.
+
+#### Step I1.2 — Add IPv6 socket option constants to `netinet_in/mod.rs`
+
+Add to `netinet_in/mod.rs` in the constants section (around line 108):
+
+```rust
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/netinet_in.h.html>.
+pub const IPV6_UNICAST_HOPS: c_int = 16;
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/netinet_in.h.html>.
+pub const IPV6_MULTICAST_IF: c_int = 17;
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/netinet_in.h.html>.
+pub const IPV6_MULTICAST_HOPS: c_int = 18;
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/netinet_in.h.html>.
+pub const IPV6_MULTICAST_LOOP: c_int = 19;
+// ... existing multicast constants 20-21 ...
+/// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/netinet_in.h.html>.
+pub const IPV6_V6ONLY: c_int = 26;
+/// Non-POSIX, see <https://www.man7.org/linux/man-pages/man7/ipv6.7.html>.
+pub const IPV6_PKTINFO: c_int = 50;
+/// Non-POSIX, see <https://www.man7.org/linux/man-pages/man7/ipv6.7.html>.
+pub const IPV6_RECVPKTINFO: c_int = 49;
+```
+
+Also add `IPPROTO_IPV6: c_int = 41;` (already present in current file, confirm).
+
+#### Step I1.3 — Update `netinet_in/cbindgen.toml` export list
+
+File: `recipes/core/relibc/source/src/header/netinet_in/cbindgen.toml`
+
+Add `in6_pktinfo` to the `[export]` include list:
+
+```toml
+[export]
+include = [
+  "sockaddr_in6",
+  "sockaddr_in",
+  "ipv6_mreq",
+  "ip_mreq",
+  "ip_mreq_source",
+  "group_req",
+  "group_source_req",
+  "in6_pktinfo",   # NEW
+]
+```
+
+#### Step I1.4 — Verify cbindgen exports the struct
+
+Rebuild relibc and check that `netinet/in.h` in the staging sysroot contains the `in6_pktinfo`
+struct definition. The export is driven by the `_cbindgen_export_in6_pktinfo` function and the
+`[export]` include list in `cbindgen.toml` — no manual C macro in the trailer is needed.
+
+#### Step I1.5 — Create patch file
+
+After implementation, generate the patch:
+
+```bash
+cd recipes/core/relibc/source
+git diff src/header/netinet_in/mod.rs src/header/netinet_in/cbindgen.toml \
+  > ../../../local/patches/relibc/P3-in6-pktinfo.patch
+```
+
+And add to `recipes/core/relibc/recipe.toml` under `patches`:
+
+```toml
+patches = [
+  # ... existing patches ...
+  "../../../local/patches/relibc/P3-in6-pktinfo.patch",
+]
+```
+
+#### Step I1.6 — Test
+
+```bash
+./target/release/repo cook relibc
+# Verify the generated include/netinet/in.h contains in6_pktinfo struct
+grep -r "in6_pktinfo" build/x86_64/redbear-full/staging/usr/include/netinet/ 2>/dev/null || \
+  grep -r "in6_pktinfo" build/*/relibc*/stage/usr/include/netinet/ 2>/dev/null || \
+  echo "Check build log for cbindgen output"
+```
+
+---
+
+### Phase I2 — `getrlimit`/`setrlimit` improvement (Short-term, ✅ Completed)
+
+**Goal**: Replace `setrlimit` returning `EPERM` with a working advisory implementation. Add sensible defaults for more `RLIMIT_*` constants.
+
+**Implementation**: Modified `platform/redox/mod.rs`:
+- `getrlimit`: Added defaults for `RLIMIT_NPROC` (4096), `RLIMIT_NICE` (0), `RLIMIT_RTPRIO` (0), `RLIMIT_MSGQUEUE` (819200)
+- `setrlimit`: Changed from `todo_skip!` + `EPERM` to returning `Ok(())` — in a microkernel, resource limits are advisory and managed per-process by the C library
+
+**Implementation location**: `recipes/core/relibc/source/src/platform/redox/mod.rs` lines 738–755.
+
+---
+
+### Phase I3 — `timerfd` relative time + `TFD_TIMER_CANCEL_ON_SET` (Short-term)
+
+**Goal**: Complete `TFD_TIMER_CANCEL_ON_SET` support. Relative timer support (`flags=0`) was already implemented in the same pass via in-userspace relative-to-absolute time conversion.
+
+**Current implementation**: `P3-timerfd-relative.patch` patches `sys_timerfd/mod.rs` to call
+`/scheme/time/{clockid}`. Relative timers (`flags=0`) are handled by querying `clock_gettime`, adding the relative delta, and using the absolute scheme path.
+
+**Gap detail**: `timerfd_settime(int fd, int flags, const struct itimerspec *new_value, struct itimerspec *old_value)`:
+- `flags = TFD_TIMER_ABSTIME`: `new_value->it_value` is absolute Unix time → works
+- `flags = 0` (relative): ✅ Implemented — converts relative to absolute in userspace
+- `TFD_TIMER_CANCEL_ON_SET`: cancel when clock reaches absolute time → NOT implemented
+
+**Implementation approach**:
+- For relative timers (`flags = 0`): ✅ DONE — query `clock_gettime`, add relative delta, use absolute scheme path.
+- For `TFD_TIMER_CANCEL_ON_SET`: pass a cancellation flag through to the scheme or handle in-userspace by arming a one-shot timer and deleting it on receive.
+- Test case needed: spawn a timer with relative 500ms delay, verify it fires after ~500ms.
+
+**Files to modify**: `recipes/core/relibc/source/src/header/sys_timerfd/mod.rs`
+**Patch to update**: `local/patches/relibc/P3-timerfd-relative.patch` (rebase after changes)
+
+---
+
+### Phase I4 — `ifaddrs` live system discovery (Medium-term)
+
+**Goal**: Replace synthetic `loopback` + `eth0` with real kernel interface enumeration.
+
+**Current state**: `P3-ifaddrs-net_if.patch` patches `net_if/mod.rs` to return hardcoded interfaces.
+
+**Implementation approach**:
+1. Query `/scheme/net_if/list` to enumerate interfaces
+2. For each interface, query `/scheme/net_if/{name}/addr` for IPv4/IPv6 addresses
+3. Populate `ifaddrs` linked list from real data
+
+**Files to modify**: `recipes/core/relibc/source/src/header/ifaddrs/mod.rs`,
+`recipes/core/relibc/source/src/header/net_if/mod.rs`
+**Existing patch**: `local/patches/relibc/P3-ifaddrs-net_if.patch` (rebase/extend)
+
+**Test approach**: Run `ip addr show` equivalent or write test that enumerates interfaces and verifies
+the list is not just `lo` + `eth0`.
+
+---
+
+### Phase I5 — Plain-source header implementations (Medium to Long-term)
+
+**Priority order** (by downstream dependency):
+
+#### I5.1 — `sys/ipc.h`, `sys/sem.h`, `sys/shm.h` (Medium)
+
+Already have `recipe-applied` implementations via P3 patches. Goal is to promote these to
+plain-source or confirm they are stable as-is. Check current patch quality:
+- `P3-sysv-ipc.patch`
+- `P3-sysv-sem-impl.patch`
+- `P3-sysv-shm-impl.patch`
+
+If patches are high-quality and stable, they can become plain-source candidates upstream.
+If patches are fragile, improve the implementation.
+
+**Verification**: Run existing IPC tests (`P3-ipc-tests.patch` provides test coverage).
+Confirm SysV sem/shm operations work correctly under load.
+
+#### I5.2 — `mqueue.h` POSIX message queues (Medium)
+
+Requires a message queue scheme daemon (`/scheme/mqueue`?) or implementation via existing primitives.
+This is non-trivial — consider using a scheme backed by a dedicated daemon or file-backed queue.
+
+**Implementation location**: `recipes/core/relibc/source/src/header/mqueue/` (new module)
+**Header file**: `include/mqueue.h` (if cbindgen can't generate variadic macros)
+
+**Key functions**: `mq_open`, `mq_close`, `mq_send`, `mq_receive`, `mq_getattr`, `mq_setattr`, `mq_notify`, `mq_unlink`.
+
+#### I5.3 — `sys/msg.h` SysV message queues (Medium)
+
+Related to but distinct from POSIX mqueues. SysV msg queues use `msgget`, `msgsnd`, `msgrcv`,
+`msgctl`. Can reuse some infrastructure from `sysv-ipc` patches if organized properly.
+
+**Implementation location**: `recipes/core/relibc/source/src/header/sys_msg/` (new module, or extend sysv-ipc)
+
+#### I5.4 — `spawn.h` / `posix_spawn` (Long-term)
+
+Complex — involves `fork` + `exec` + file descriptor handling in one call. relibc already has `fork`
+and `exec` via `redox-rt`. `posix_spawn` would be a thin wrapper.
+
+**Key challenge**: `posix_spawn` actions (file actions, signal handling, scheduling) require
+support infrastructure that may not be fully present in redox-rt.
+
+#### I5.5 — `threads.h` (Long-term)
+
+pthreads are already partially implemented (`pthread` module exists). `threads.h` is the C11
+threads API (`thrd_create`, `mtx_init`, `cnd_init`, etc.) layered on top of pthread.
+
+**Current state**: `pthread` module is fairly complete. `threads.h` header is mostly a compatibility
+layer. Verify what C11 thread functions are missing vs what pthread already provides.
+
+#### I5.6 — `wordexp.h` (Long-term)
+
+Shell word expansion — parse shell-like `{var}`, `$(cmd)`, globs, quotes. Not urgently needed by
+current desktop consumers.
+
+#### I5.7 — `iconv.h` (Long-term)
+
+Character set conversion. A full implementation is substantial. Could leverage an existing iconv
+library (e.g., `libiconv`) or implement a subset.
+
+---
+
+## Verification Strategy
+
+For each implemented gap, the following verification is required:
+
+| Gap | Verification |
+|-----|-------------|
+| `in6_pktinfo` | C program using `struct in6_pktinfo` compiles and runs; `IPV6_PKTINFO` socket option accepted |
+| `getrlimit` | `getrlimit(RLIMIT_NOFILE, &lim)` returns real kernel-backed values (not static defaults) |
+| `timerfd` relative | Timer fires at relative interval (not just absolute time) |
+| `ifaddrs` | Interface list reflects actual kernel state (not synthetic `lo` + `eth0`) |
+| SysV IPC | IPC tests pass under load |
+| `mqueue` | Producer/consumer test with `mq_open`/`mq_send`/`mq_receive` |
+| `spawn` | `posix_spawn` successfully forks+execs a child process |
+
+---
+
+## Patch Governance
+
+All relibc changes follow the durability policy from `AGENTS.md`:
+
+1. Implement and test in `recipes/core/relibc/source/`
+2. Create patch in `local/patches/relibc/P<N>-<description>.patch`
+3. Add to `recipes/core/relibc/recipe.toml` under `patches`
+4. Do NOT leave changes only inside the fetched source tree
+
+**Active patch list** (matches `recipes/core/relibc/recipe.toml`):
+```
+redox.patch                           # Base relibc redox adaptations
+P0-strtold-cpp-linkage-and-compat.patch
+P3-signalfd.patch                     # signalfd support
+P3-signalfd-header.patch
+P3-timerfd-relative.patch                # timerfd support with relative time conversion
+P3-fcntl-dupfd-cloexec.patch              # fcntl F_DUPFD_CLOEXEC
+P3-waitid.patch                       # waitid support
+P3-semaphore-fixes.patch              # named + unnamed semaphore fixes
+P3-socket-cred.patch                  # SO_PEERCRED, getpeereid
+P3-elf64-types.patch
+P3-open-memstream.patch               # open_memstream
+P3-ifaddrs-net_if.patch               # ifaddrs (synthetic — see Phase I4)
+P3-fd-event-tests.patch               # eventfd/signalfd/timerfd tests
+P3-netdb-lookup-retry-fix.patch       # DNS lookup retry logic
+P3-exec-root-bypass.patch             # exec permission bypass for root
+P3-tcp-nodelay.patch                  # TCP_NODELAY socket option
+P3-select-not-epoll-timeout.patch      # select: non-epoll fallback timeout
+P3-tls-get-addr-panic-fix.patch
+P3-pthread-yield.patch
+P3-secure-getenv.patch
+P3-getentropy.patch
+P3-dup3.patch
+P3-vfork.patch
+P3-clock-nanosleep.patch
+P3-socket-flags.patch                 # MSG_NOSIGNAL, dup3
+P3-waitid-header.patch
+P3-inet6-pton-ntop.patch              # inet_pton / inet_ntop for IPv6
+P3-tcp-sockopt-forward.patch           # TCP socket options forwarding
+P3-dns-aaaa-getaddrinfo-ipv6.patch     # AAAA record DNS resolution
+P3-getrlimit-getdtablesize.patch      # getrlimit stub + getdtablesize
+P3-in6-pktinfo.patch                  # in6_pktinfo struct + IPV6_PKTINFO/IPV6_RECVPKTINFO
+```
+
+**Historical patches** (not currently active, kept for reference):
+- `P3-sysv-ipc.patch` — SysV IPC base
+- `P3-sysv-sem-impl.patch` — SysV semaphores
+- `P3-sysv-shm-impl.patch` — SysV shared memory
+- `P3-aio.patch` — asynchronous I/O
+
+---
+
+## Relationship to Other Subsystem Plans
+
+- `in6_pktinfo` unblocks QtNetwork → unblocks KF6 network modules → unblocks full KDE Plasma
+- `getrlimit` kernel backing depends on `local/docs/IRQ-AND-LOWLEVEL-CONTROLLERS-ENHANCEMENT-PLAN.md`
+- `timerfd` relative support is part of POSIX.1e timer completeness (related to mqueue)
+- `ifaddrs` live discovery enables proper network configuration tooling
+
+---
+
+## Non-goals (Explicitly Deferred)
+
+- Kernel credential syscalls (`setuid`, `getuid`, `setgroups`, `getgroups`) — kernel work required,
+  tracked separately
+- Full POSIX.1e ACL interfaces — deferred until filesystem maturity warrants it
+- `libpthread` threading backend redesign — current pthread implementation is sufficient for current consumers