nuttx implements fork() and vfork() as the same function, and is gaining the
three separate primitives its issue #19540 describes: task_fork() (shares
memory, private stack copy, both running), vfork() (shares memory, parent
suspended) and POSIX fork() (child gets its own copy). This is the apps side
of that, and it lands first: it works against nuttx with or without the
split, so the tests keep running across the transition rather than silently
compiling out.
ostest's "vfork" test was never testing vfork(). It has the child write a
global and the parent observe the write -- which is the defining property of
*sharing*, not of vfork(), whose defining property is that the parent is
suspended and whose contract forbids the child to write anything at all. It
is renamed to task_fork.c, unchanged, because that is the primitive it has
always described.
vfork.c is rewritten to test what vfork() promises. The child does only what
POSIX permits -- it calls _exit(42), and nothing else, not even exit(), which
would run atexit handlers and flush stdio in the parent's address space. The
observable is therefore the child's exit status rather than a memory write.
Where child status is not retained -- ostest_main() sets SA_NOCLDWAIT for the
whole run, deliberately -- waitpid() returning ECHILD is accepted as equally
good evidence: it says the child was already gone when the parent asked.
fork.c is new and tests POSIX fork(): the child's writes to .data, .bss and
the heap are invisible to the parent and vice versa, a pointer to a stack
local taken before the fork names the same object in both, and the child does
everything a vfork() child may not -- calls malloc() and printf(), and returns
from the function that called fork().
All three run at the top of user_main() rather than in the middle. They
exercise the lowest-level machinery in the suite -- address environments,
stack setup, the architecture's register context -- so a fault in one takes
the process down instead of reporting a failure, and finding that out in
seconds rather than after everything else has passed is the difference
between a usable iteration and a coffee break when a port is being brought
up.
The other in-tree callers are audited for which primitive they actually
meant. nand_sim wants a daemon that outlives its caller and shares its
memory, which is task_fork(). bas's SHELL and EDIT statements, python's
_posixsubprocess and libwebsockets' feature macros want the fork-then-exec
path, which vfork() serves; python's os.fork() and libwebsockets'
LWS_HAVE_FORK stay on fork() proper. fdsantest's vfork case follows vfork().
Two third-party suites need their source lists narrowed, because they call
fork() from code that is compiled unconditionally:
* system/libuv -- test-fork.c and test-pipe-close-stdout-read-stdin.c are
filtered out of the test-*.c glob. Every test they define is already
excluded from the task list on NuttX by 0001-libuv-port-for-nuttx.patch --
the nine fork_* entries and pipe_close_stdout_read_stdin -- so they were
dead code being compiled only because fork() happened to be declared.
* testing/ltp -- the open_posix_testsuite is filtered through the existing
BLACKWORDS mechanism, which already drops tests for absent features and is
already conditioned on configuration symbols. Where fork() is not
provided this drops 278 of 1943 test files; the pattern is written to spare
vfork() and task_fork(), which remain available. Where fork() is provided
-- which today is everywhere -- nothing is dropped.
Compatibility: the nuttx symbols this keys on do not exist yet. task_fork.c
is built where CONFIG_TASK_FORK says task_fork() was built and, on a nuttx that
has no CONFIG_ARCH_HAVE_TASK_FORK at all -- which is the pre-split one -- where
CONFIG_ARCH_HAVE_FORK does. Today's fork() *is* task_fork(), so the test that
has always covered that primitive keeps running, under its own name, and no
coverage is lost across the transition. Both spellings are needed because
CONFIG_TASK_FORK is optional on the nuttx side: ARCH_HAVE_TASK_FORK says the
architecture can clone a task, TASK_FORK says this build asked for it. A
follow-up removes the fallback once the split has landed.
vfork_test() and fork_test() deliberately have no such fallback. Both check
semantics a pre-split nuttx does not describe -- the parent suspension and the
private copy -- and ARCH_HAVE_VFORK is the evidence that the split has landed.
Mapping them onto ARCH_HAVE_FORK would also add a test to configurations that
never had one, which is not free: vfork.c costs about 470 bytes of .text on
armv7-m at -Os, and that is what put lm3s6965-ek:qemu-protected over its 128
KiB user flash region.
Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com>
Assisted-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
Adds options to support building when CONFIG_NET is not set.
This allows building Python for boards that do not have networking support.
Signed-off-by: Filipe Cavalcanti <filipe.cavalcanti@espressif.com>
This commit disables the `no-maybe-uninitialized` warning because
it's wrongly evaluated after increasing the optimization level of
the Python's library.
Signed-off-by: Tiago Medicci <tiago.medicci@espressif.com>
Adds support for installing nuttx-periphery Python package by default
on Python support. This package provides API for accessing Nuttx
character drivers.
Signed-off-by: Filipe Cavalcanti <filipe.cavalcanti@espressif.com>
This commit enables using `pip` as a pre-compiled (pyc) built-in
distributed along with cpython.
Signed-off-by: Tiago Medicci <tiago.medicci@espressif.com>
Replace app-side includes of <debug.h> with <nuttx/debug.h> to use the
header from the NuttX tree explicitly after the header move.
Signed-off-by: Piyush Patle <piyushpatle228@gmail.com>
Aligns `CONFIG_INTERPRETER_*` options to `CONFIG_INTERPRETERS_*` options
to be consistent with other interpreters.
BREAKING CHANGE: All configurations using `CONFIG_INTERPRETER_PYTHON_*`
options will no longer compile due to missing symbol errors. The fix is
very quick: any configurations using this options should add a trailing
S following INTERPRETER in the affected Kconfig variables. I believe
`./tools/refresh.sh` should also be capable of doing this automatically.
Signed-off-by: Matteo Golin <matteo.golin@gmail.com>
NuttX implements a function with the same name which may end up
being included whenever `CONFIG_MM_KERNEL_HEAP` is set. To avoid
it, insert a prefix to it on Python's implementation.
Please note that the other patches had their metadata updated too.
This commit prevents Python from linking to standard libraries.
This is needed because Python's `configure` script tests for a set
of available functions that are provided by NuttX (instead of the
toolchain) and not having `-nostdlib` set may give wrong results.
This commit also adds the check for the `__NuttX__` macro to the
patch file that allows setting an attribute to the `_PyRuntime`
structure. The `__NuttX__` macro is guaranteed to be present when
building any application for NuttX.
This wrapper application checks if the Python's modules are already
mounted (and mounts them, if not), sets the necessary environment
variables and, then, runs the Python interpreter.
The `Setup.local` and the `config.site` files are used by Python's
build system to, respectively, enable or disable Python's modules
and set/unset available functions in the target system. These files
are now set according to NuttX's configs, enabling or disabling
Python's features according to the configs set on NuttX.
By setting a specific region for the `_PyRuntime` structure, it is
possible to move it to the external memory, for instance, freeing
the internal memory (this structure occupies around 140KiB).
Most tools used for compliance and SBOM generation use SPDX identifiers
This change brings us a step closer to an easy SBOM generation.
Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
This is the NuttX's port of Python (cpython)!
Initial support of Python includes building the Python's static
library and the `python` (Programs/python.c) application. Python's
modules are stored in `pyc` (byte-code file) and loaded as needed
from flash.
