Documentation/guides/fork_vfork_migration.rst is new. It says what changed
and why, gives the two primitives as a table, states plainly what breaks, and
answers "which replacement do I want?" from the reader's own reason for having
called fork() -- posix_spawn() or vfork() to run a program, pthread_create()
for a second flow of control that shares memory, fork() itself for an
independent copy. It also documents the two configuration symbols, what an
architecture has to implement to gain real fork(), and the one visible
consequence of moving the vfork() suspension into the kernel: a waitpid()
after a child that _exit()s can only report status where
CONFIG_SCHED_CHILD_STATUS is enabled.
reference/user/01_task_control.rst gains an entry for fork() and rewrites the
one for vfork(), which described NuttX's limitations rather than the
interface's contract. standards/posix.rst moves fork() from "No" to "Cond."
and vfork() from "Yes" to "Cond.", both being conditional on the configuration
now. implementation/memory_configurations.rst no longer lists fork() as
unimplementable in the presence of address environments, which was the whole
point of that section's wish list. Three long-standing typos in that file are
corrected while touching it, since codespell checks the whole of any file a
patch modifies.
BREAKING CHANGE: this commit carries no code; it is the migration guide for
the fork() withdrawal in the commit before it, and is marked so that every
commit in the series carries the marker CONTRIBUTING.md 1.13 requires. The
quick fixes are in Documentation/guides/fork_vfork_migration.rst.
Assisted-by: Claude Code:claude-opus-5
Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com>
Describe the shared library open semantics in the FLAT and PROTECTED
builds: dlopen() of a library that is already loaded returns a handle
to it and takes an additional reference, and the library is unloaded
only when the last handle is closed. Note the consequences that follow
from having a single instance: libraries are matched by basename, data
is shared by all users, and constructors and destructors run once.
Contrast this with insmod(), which still rejects a duplicate module
name, and note that dlopen() is not implemented in the KERNEL build.
Assisted-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com>
Document inode_checkperm / inode_checkpathperm, mountpoint traverse vs open
semantics, and the optional mountpt_operations.permission hook in
file_permission.rst.
Signed-off-by: Abhishek Mishra <mishra.abhishek2808@gmail.com>
Document setreuid/setregid, getresuid/getresgid, and how inode_reserve
assigns owner and group for pseudo-filesystem objects.
Signed-off-by: Abhishek Mishra <mishra.abhishek2808@gmail.com>
Fix repeated and misspelled words in the kernel modules versus shared libraries implementation notes so the text reads correctly.
Signed-off-by: Old-Ding <35417409+Old-Ding@users.noreply.github.com>
Add a new section under Implementation Details explaining the CRC32
variants available in NuttX, including the difference between the
native crc32() and the new Linux/zlib-compatible crc32_ieee().
Signed-off-by: hanzhijian <hanzhijian@zepp.com>
Move the stm32l1 sources, headers and boards into arch/arm/src/stm32l1,
arch/arm/include/stm32l1 and boards/arm/stm32l1, then finalize the split:
source each split family directly in arch/arm/Kconfig and boards/Kconfig and
remove the now-empty combined arch/arm/src/stm32 and boards/arm/stm32 trees.
BREAKING CHANGE: The legacy STM32 architecture and board paths were split into
stm32f1, stm32l1, stm32f2, stm32f3, stm32f4, and stm32g4 directories.
Out-of-tree boards must move from stm32 to the matching split family.
Signed-off-by: raiden00pl <raiden00@railab.me>
BREAKING CHANGE: Common STM32 source and private header files moved to
arch/arm/src/common/stm32. Out-of-tree code that references family-local
common source paths must update includes, build rules, and source paths
to the new common STM32 location.
Signed-off-by: raiden00pl <raiden00@railab.me>
Adds comprehensive documentation for the POSIX three-tier user identity
model (real, effective, saved-set IDs) enabled by CONFIG_SCHED_USER_IDENTITY.
* Updates sched/Kconfig with detailed help text explaining the config.
* Adds user_identity.rst to formally document credential inheritance
and the privilege transition rules for setuid(), seteuid(), setgid(),
and setegid().
* Updates tasks_vs_threads.rst to list credentials as a shared task
group resource.
Signed-off-by: Abhishek Mishra <mishra.abhishek2808@gmail.com>
The repo bitbucket.org/nuttx/tools is no longer available. This PR changes it to to github.com/patacongo/tools, as explained in https://github.com/apache/nuttx/pull/18890. This PR updates the URL in Dockerfile and Docs.
Signed-off-by: Lup Yuen Lee <luppy@appkaki.com>
Fix 269 occurrences of duplicate "the" word typo found in 209 files
across source code, header files, and configuration.
Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
Since the busy-wait time statistics for entering the critical section have been added, the critmon information in the document has been updated accordingly.
Signed-off-by: wangzhi16 <wangzhi16@xiaomi.com>
This commit adds initial high level overview of the NuttX
make-based build system. It documents:
* Tools used during the build process
* Mechanisms set in place during the build process
Signed-off-by: Luchian Mihai <luchiann.mihai@gmail.com>
