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Posted to commits@nuttx.apache.org by "casaroli (via GitHub)" <gi...@apache.org> on 2026/10/11 18:58:06 UTC
[PR] libs/libc/unistd: Return ARG_MAX from sysconf(_SC_ARG_MAX). [nuttx]
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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Re: [PR] libs/libc/unistd: Return ARG_MAX from sysconf(_SC_ARG_MAX). [nuttx]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #20602:
URL: https://github.com/apache/nuttx/pull/20602#issuecomment-6112598884
<!-- membrowse-pr-comment -->
## <img src="https://membrowse.com/membrowse-logo.svg" height="24" align="top"> MemBrowse Memory Report
*No memory changes detected for:*
- [arduino-mega2560](https://membrowse.com/public/apache/nuttx/target/arduino-mega2560/compare?head=0347c6be05cb547914beeb9b6323be40ae9b9a97&base=4bc1ab2fd7bede547e91c8e3a7dac3bd6eb941f7)
- [esp32-devkitc](https://membrowse.com/public/apache/nuttx/target/esp32-devkitc/compare?head=0347c6be05cb547914beeb9b6323be40ae9b9a97&base=4bc1ab2fd7bede547e91c8e3a7dac3bd6eb941f7)
- [hifive1-revb](https://membrowse.com/public/apache/nuttx/target/hifive1-revb/compare?head=0347c6be05cb547914beeb9b6323be40ae9b9a97&base=4bc1ab2fd7bede547e91c8e3a7dac3bd6eb941f7)
- [mirtoo](https://membrowse.com/public/apache/nuttx/target/mirtoo/compare?head=0347c6be05cb547914beeb9b6323be40ae9b9a97&base=4bc1ab2fd7bede547e91c8e3a7dac3bd6eb941f7)
- [qemu-armv8a](https://membrowse.com/public/apache/nuttx/target/qemu-armv8a/compare?head=0347c6be05cb547914beeb9b6323be40ae9b9a97&base=4bc1ab2fd7bede547e91c8e3a7dac3bd6eb941f7)
- [qemu-intel64](https://membrowse.com/public/apache/nuttx/target/qemu-intel64/compare?head=0347c6be05cb547914beeb9b6323be40ae9b9a97&base=4bc1ab2fd7bede547e91c8e3a7dac3bd6eb941f7)
- [rx65n-rsk2mb](https://membrowse.com/public/apache/nuttx/target/rx65n-rsk2mb/compare?head=0347c6be05cb547914beeb9b6323be40ae9b9a97&base=4bc1ab2fd7bede547e91c8e3a7dac3bd6eb941f7)
- [s698pm-dkit](https://membrowse.com/public/apache/nuttx/target/s698pm-dkit/compare?head=0347c6be05cb547914beeb9b6323be40ae9b9a97&base=4bc1ab2fd7bede547e91c8e3a7dac3bd6eb941f7)
- [stm32-nucleo-f103rb](https://membrowse.com/public/apache/nuttx/target/stm32-nucleo-f103rb/compare?head=0347c6be05cb547914beeb9b6323be40ae9b9a97&base=4bc1ab2fd7bede547e91c8e3a7dac3bd6eb941f7)
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Re: [PR] libs/libc/unistd: Return ARG_MAX from sysconf(_SC_ARG_MAX). [nuttx]
Posted by "acassis (via GitHub)" <gi...@apache.org>.
acassis merged PR #20602:
URL: https://github.com/apache/nuttx/pull/20602
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