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feat(freertos/vfs): add Linux cooperative syscall dispatch with VFS FD registration

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Rework the syscall interposition architecture so FreeRTOS works
standalone (without VFS) and VFS optionally overrides with strong
symbols.  All kernel FDs are registered with VFS via
esp_vfs_register_fd_with_local_fd, so the application only sees
VFS-allocated FD numbers, preventing numerical collisions between
kernel FDs and VFS-internal FD slots.

FreeRTOS side:
- Create linux_port_coop_internal.h with LINUX_COOP_IO_LOOP,
  LINUX_COOP_RESOLVE, linux_coop_yield and FD state table functions
- Export cooperative I/O primitives (freertos_linux_coop_read/write/
  open/close/fcntl/select/pread/pwrite/readv/writev/recv/send/
  recvfrom/sendto/recvmsg/sendmsg/connect/accept/pselect/poll/
  socket/socketpair/pipe/pipe2/dup/dup2/syscalls_init)
- Define weak POSIX symbols calling through to the cooperative
  primitives; keep nanosleep/sleep/usleep as strong (not FD-related)
- Refactor freertos_linux_coop_syscalls.h into a pure public API header

VFS side:
- Register the Linux host FS with esp_vfs_register_fs_with_id() as a
  proper VFS driver; register stdin/stdout/stderr at init (priority 99)
- Rewrite vfs_linux.c with strong POSIX symbols dispatching through
  esp_vfs_*
- Add strong overrides for FD-creating syscalls (open, pipe, pipe2,
  socket, socketpair, dup, dup2, accept) that register returned FDs
  with VFS
- Add strong overrides for FD-translating syscalls (readv, writev,
  recv, send, recvfrom, sendto, recvmsg, sendmsg, connect, pselect,
  poll) that translate VFS FD to kernel FD
- Delete vfs_coop_syscalls.c (absorbed into FreeRTOS weak + VFS strong)
- Update CMakeLists.txt: remove vfs_coop_syscalls.c, add linker hook
This commit is contained in:
Guillaume Souchere
2026-06-04 11:36:34 +02:00
parent 78420f2614
commit 9835daba70
13 changed files with 1747 additions and 385 deletions
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components/esp_system/system_init_fn.txt
+3
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@@ -24,6 +24,9 @@ CORE: 10: init_show_cpu_freq in components/esp_system/startup_funcs.c on BIT(0)
CORE: 20: init_show_app_info in components/esp_app_format/esp_app_desc.c on BIT(0)
CORE: 21: init_efuse_show_app_info in components/efuse/src/esp_efuse_startup.c on BIT(0)
# Set the standard stream to non blocking and register the default vfs
CORE: 99: init_vfs_linux_coop in components/vfs/vfs_linux_default_coop.c on BIT(0)
# Initialize heap allocator. WARNING: This *needs* to happen *after* the app cpu has booted.
# If the heap allocator is initialized first, it will put free memory linked list items into
# memory also used by the ROM. Starting the app cpu will let its ROM initialize that memory,