LingaoM opened a new pull request, #19456:
URL: https://github.com/apache/nuttx/pull/19456
## Summary
This PR improves NuttX sim compatibility for standard POSIX-facing APIs
used by simulated applications.
Changes included:
- Add `AF_LOCAL` / `AF_UNIX` support to sim `usrsock`, so applications can
use the normal NuttX socket API to communicate with host Unix-domain sockets.
- Translate hostfs POSIX byte-range lock operations.
`fcntl(F_GETLK/F_SETLK)` reaches file systems as `FIOC_*` ioctl commands after
VFS handling; hostfs now converts those lock
requests back to host `fcntl()` for host-backed files.
- Add built-in `http` and `https` service entries to libc netdb so
`getservbyname()` / `getaddrinfo()` can resolve common service names without
requiring numeric ports.
The changes keep applications using standard NuttX/POSIX interfaces rather
than exposing host-only APIs directly to application code.
## Impact
- Affects sim builds using `usrsock`, `hostfs`, or libc `netdb`.
- Applications can use `socket(AF_LOCAL, ...)` through the normal NuttX
socket layer on sim.
- Applications using hostfs can use non-blocking POSIX file locks through
`fcntl(F_GETLK/F_SETLK)`.
- `F_SETLKW` is intentionally left unsupported for hostfs and returns
`-ENOSYS`, because forwarding a blocking host `fcntl()` could block the whole
sim OS.
- `http` and `https` become available in the built-in service database
when `CONFIG_LIBC_NETDB=y`.
- No hardware targets are affected by the sim host-side changes.
## Testing
Host machine:
- Ubuntu 22.04 x86_64
Board/config:
- `sim:nsh`
Build test:
```bash
make clean
make -j16
Runtime tests performed with temporary hello examples, then restored
before commit.
AF_LOCAL / usrsock test:
- Built sim:nsh with usrsock enabled.
- Ran a temporary hello app that connected to host Unix-domain sockets
using normal NuttX socket(AF_LOCAL, ...).
- Verified both SOCK_STREAM and SOCK_SEQPACKET.
- The app exchanged data with a host socket server and printed:
AF_LOCAL usrsock test passed
hostfs file lock test:
- Built sim:nsh with:
CONFIG_FS_HOSTFS=y
CONFIG_SIM_HOSTFS=y
CONFIG_EXAMPLES_HELLO=y
- Ran a temporary hello app that mounted /tmp through hostfs, opened a
host-backed file, then verified:
fcntl(fd, F_SETLK, ...)
fcntl(fd, F_GETLK, ...)
fcntl(fd, F_SETLK, F_UNLCK)
- The app printed:
hostfs fcntl lock test passed
netdb service-name test:
- Built sim:nsh with:
CONFIG_LIBC_NETDB=y
CONFIG_EXAMPLES_HELLO=y
- Ran a temporary hello app that verified:
getservbyname("http", "tcp") -> port 80
getservbyname("https", "tcp") -> port 443
- The app printed:
getservbyname http/https test passed
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