rust-kernel

@@ -76,7 +76,7 @@ Under the shell:   CLONE_THREAD ...)`, **futexes**, thread-local storage (`arch_prctl`),   `gettid`, `tgkill`, `exit` vs `exit_group`, running on all 4 CPUs at   once; real **ttys and ptys** with termios, canonical/raw modes, echo,-  ^C/^Z/^\\ as signals on every terminal, `/dev/tty`, `/dev/ptmx` and+  ^C/^Z/^\ as signals on every terminal, `/dev/tty`, `/dev/ptmx` and   `/dev/pts/N`; plus `nanosleep`, `clock_gettime(CLOCK_REALTIME)`,   `readv`/`writev`, `pread`/`pwrite` and `readlink /proc/self/exe`. @@ -978,7 +978,7 @@ heap_allocation::simple_allocation...               [ok] | `tests/virtio.rs` | **the virtual drivers**: 2 x 4 KiB from virtio-rng differ, aren't constant, have 15384-17384 one bits out of 32768 and contain all 256 byte values; the `random` program (hex, dice, a usage error); hvc0 receives exactly the bytes QEMU feeds in from `tests/hvc0-input.txt`, and 8 KiB written to it go out with nothing dropped; virtio-gpu answers `GET_DISPLAY_INFO`, refuses a flush of a resource that doesn't exist with `ERR_INVALID_RESOURCE_ID`, full and clipped flushes work, a pattern written into the framebuffer reads back; the text console is on the framebuffer (128x48) and printing lights up pixels; `/dev` lists `fb0 hvc0 null random urandom`; `tile` draws the expected colours at known pixels, moves the console to 61x46 and `tile -r` back, with no frames leaked. `scripts/gpu-check.sh` checks what QEMU actually displays | | `tests/guard_pages.rs` | the guard page sits right below each kernel stack, and the user stack's 64 KiB guard zone has the right bounds; a kernel thread that recurses forever is killed with "kernel stack overflow" three times in a row (the rest of the kernel carries on, and its stack is freed); the user `overflow` program ends with `Killed(SIGSEGV, "stack overflow")` and leaves no frames behind | | `tests/process.rs` | **the process model** (stage 14), mostly by running the user test programs: `cowtest` (globals, heap and stack stay separate after fork in both directions, three generations, `MAP_SHARED` vs `MAP_PRIVATE`); `forktest` (fork/wait4/getppid, 10 children reaped with `wait4(-1)`, `ECHILD`, execve errors, vfork + exec, `pipe2(O_CLOEXEC)`, fork + dup2 + exec through a pipe, a child dying of SIGSEGV); **exec argv/envp/auxv** (`forktest args "two words" ""` with `FOO=bar EMPTY=`: argc, every argv and envp string, `AT_PAGESZ`, `AT_ENTRY` = `_start`, `AT_PHDR` covering the entry, `AT_RANDOM`, `AT_EXECFN`, stack position); `mmaptest` (zeroed anonymous memory, 64 MiB that costs nothing until touched, SIGSEGV handlers that see `si_addr` and `SEGV_ACCERR`/`SEGV_MAPERR` and fix the fault so the access is retried, `PROT_NONE`, file-backed private mappings, `brk`, `EINVAL`s, memory back to the start); an unhandled fault is `Killed(SIGSEGV)` with status 11 and exit code 139; `sigtest` (handler round trip through sigreturn with registers intact, masks and pending signals, SIGKILL can't be caught, default actions, SIGCHLD with `si_pid`/`si_status`, SIGPIPE, stop/continue seen by `wait4(WUNTRACED/WCONTINUED)`, `EINTR` vs `SA_RESTART`, `kill` errors, signal 0, `kill(-pgid)`); wait-status encoding; a **fork bomb** stops at `EAGAIN`, is killed and reaped, and leaves frames and the process count unchanged; **20 fork/exec/exit loops leak no frames** and leave no shared frames; **Ctrl+C** (`tty::input_char('\x03')`) kills `spin` in the foreground group with SIGINT (exit code 130), and does nothing when no group is in the foreground |-| `tests/libc.rs` | **libc plumbing** (stage 15), by running four user test programs twice each (a warm-up, then a run that must leave the thread, process, futex-waiter, pty, socket and frame counts exactly as they were): `threads` (4 threads sum 1..=40,000,000 on several CPUs; a futex mutex keeps a shared counter exact while an unlocked one loses updates; each thread sees its own TLS value through `fs:`; `gettid`; `FUTEX_WAIT` with a stale value is `EAGAIN`, times out, `FUTEX_WAKE` with no waiters; `CLONE_CHILD_CLEARTID` + futex wake for join; `exit` ends one thread, `exit_group` all; `tgkill` and `ESRCH`); `echoserver` (an epoll server and a poll server on 127.0.0.1, three forked clients each, plus UDP over loopback); `ptytest` (canonical mode holds a half line back, backspace editing, CR -> NL, echo, ONLCR; raw mode passes bytes through without echo; `TCGETS`/`TCSETS`; ^C and ^\\ kill the child that made the pty its controlling terminal with SIGINT/SIGQUIT and echo "^C"; `/dev/tty` with and without a controlling terminal; closing the master gives the slave EOF); `nbtest` (`EAGAIN` from pipes, sockets and ptys; 64 KiB pipe capacity; poll bits; `fcntl(F_SETFL, O_NONBLOCK)` and `FIONBIO`; nonblocking `connect` is `EINPROGRESS` then `POLLOUT`; `select`, `ppoll`, `readv`/`writev`, `pread`/`pwrite`, `getcwd`, `uname`, `CLOCK_REALTIME`, `nanosleep`, `readlink /proc/self/exe`) |+| `tests/libc.rs` | **libc plumbing** (stage 15), by running four user test programs twice each (a warm-up, then a run that must leave the thread, process, futex-waiter, pty, socket and frame counts exactly as they were): `threads` (4 threads sum 1..=40,000,000 on several CPUs; a futex mutex keeps a shared counter exact while an unlocked one loses updates; each thread sees its own TLS value through `fs:`; `gettid`; `FUTEX_WAIT` with a stale value is `EAGAIN`, times out, `FUTEX_WAKE` with no waiters; `CLONE_CHILD_CLEARTID` + futex wake for join; `exit` ends one thread, `exit_group` all; `tgkill` and `ESRCH`); `echoserver` (an epoll server and a poll server on 127.0.0.1, three forked clients each, plus UDP over loopback); `ptytest` (canonical mode holds a half line back, backspace editing, CR -> NL, echo, ONLCR; raw mode passes bytes through without echo; `TCGETS`/`TCSETS`; ^C and ^\ kill the child that made the pty its controlling terminal with SIGINT/SIGQUIT and echo "^C"; `/dev/tty` with and without a controlling terminal; closing the master gives the slave EOF); `nbtest` (`EAGAIN` from pipes, sockets and ptys; 64 KiB pipe capacity; poll bits; `fcntl(F_SETFL, O_NONBLOCK)` and `FIONBIO`; nonblocking `connect` is `EINPROGRESS` then `POLLOUT`; `select`, `ppoll`, `readv`/`writev`, `pread`/`pwrite`, `getcwd`, `uname`, `CLOCK_REALTIME`, `nanosleep`, `readlink /proc/self/exe`) |  How it works: `#![feature(custom_test_frameworks)]` collects every `#[test_case]` function and passes them to `rustbelt::test_runner` (in `src/lib.rs`), which@@ -1039,7 +1039,7 @@ src/block/partition.rs    MBR + GPT parsing, Partition = a BlockDevice window on src/elf.rs                minimal ELF64 loader (PT_LOAD segments -> regions; program headers for AT_PHDR) src/errno.rs              Linux errno numbers src/tty.rs                ttys (stage 15): the console, hvc0 and ptys share one line discipline-                          (termios, canonical/raw, echo, ^C/^Z/^\\ -> signals), sessions and+                          (termios, canonical/raw, echo, ^C/^Z/^\ -> signals), sessions and                           controlling terminals, /dev/tty, /dev/ptmx + /dev/pts/N src/poll.rs               poll, ppoll, select, pselect6 and epoll (one global "something changed" counter) src/futex.rs              futex WAIT/WAKE (+ bitsets, private flag, timeouts): what libc mutexes and