casaroli opened a new pull request, #20602:
URL: https://github.com/apache/nuttx/pull/20602
## Summary
`sysconf(_SC_ARG_MAX)` returned -1 with `ENOSYS`. POSIX requires it to
return `ARG_MAX`, and programs that build command lines, such as xargs, use it
to size them.
This PR returns `ARG_MAX` from `<limits.h>`.
## Impact
`sysconf(_SC_ARG_MAX)` works. No other change.
## Testing
The run-time tests ran on a local branch that has this change and other
pending changes on top of master; the builds are of this branch alone.
On master, `sysconf(_SC_ARG_MAX)` takes the default branch and fails with
`ENOSYS`. With this change, Python's `os.sysconf("SC_ARG_MAX")` returns 32768
on qemu-armv8a (kernel build, QEMU 11 with HVF, a local configuration with
`ARG_MAX` set to 32768 through `CONFIG_TASK_ARG_MAX` from #20596).
Builds with `-Wno-cpp -Werror`: `qemu-armv8a:nsh`, `qemu-armv8a:knsh`.
`tools/checkpatch.sh -c -u -m -g` passes.
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