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serhiy-storchaka

opened on Aug 7, 2025

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Feature or enhancement

There are some RLIMIT_* constants on Posix platforms which are not currently exposed in the resource module.

• RLIMIT_NTHR. Available on NetBSD >= 7.0, QNX >= 6.3.2.
• RLIMIT_UMTXP. Available on FreeBSD >= 11.
• RLIMIT_PIPEBUF. Available in the main branch on FreeBSD (>= 15?) >= 14.2.
• RLIMIT_THREADS. Available on AIX. The same as RLIMIT_NTHR?
• RLIMIT_VMEM. Available on Solaris/OpenIndiana. On FreeBSD >= 5.3 it is an alias of RLIMIT_AS.

Constants RLIM_SAVED_CUR and RLIM_SAVED_MAX are used on some platforms (Solaris/OpenIndiana, AIX) to represent values that cannot be represented in 32-bit rlim_t.

It is perhaps too early to add RLIMIT_PIPEBUF.

RLIMIT_NTHR and RLIMIT_THREADS, should we only add one of them on the corresponding platform or add both names as aliases of one other?

RLIMIT_VMEM. Should we add it as an alias of RLIMIT_AS on all other platforms?

I am not sure whether RLIM_SAVED_CUR and RLIM_SAVED_MAX are still relevant on modern Unixes. Their use is complicated. They are the part of Posix, but not defined on Linux. On FreeBSD they are aliases of RLIM_INFINITY and are not useful at all.

Linked PRs

• gh-137512: Add new constants in the resource module #137513

Activity

1. serhiy-storchaka

   added

   type-featureA feature request or enhancementA feature request or enhancement

   3.15bugs and security fixesbugs and security fixes

   on Aug 7, 2025
2. serhiy-storchaka commented on Aug 7, 2025

   

   serhiy-storchaka

   on Aug 7, 2025

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   On other look, RLIMIT_NTHR and RLIMIT_THREADS are different. The former is per user and the latter is per process.
3. serhiy-storchaka commented on Aug 7, 2025

   

   serhiy-storchaka

   on Aug 7, 2025

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   Ah, RLIMIT_VMEM was already added.
4. serhiy-storchaka

   added 2 commits that reference this issue on Aug 7, 2025

   pythongh-137512: Add new constants in the resource module

   82f9a11

   pythongh-137512: Add new constants in the resource module

   7428fd4
5. StanFromIreland

   added

   extension-modulesC modules in the Modules dirC modules in the Modules dir

   on Aug 7, 2025
6. serhiy-storchaka

   added a commit that references this issue on Aug 7, 2025

   pythongh-137512: Add new constants in the resource module

   71671f0
7. picnixz

   removed

   3.15bugs and security fixesbugs and security fixes

   on Aug 8, 2025
8. encukou

   added a commit that references this issue on Aug 19, 2025

   gh-137512: Add new constants in the resource module (GH-137513)

   6e2b9a2
9. serhiy-storchaka commented on Aug 19, 2025

   

   serhiy-storchaka

   on Aug 19, 2025

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   As was pointed by @encukou, RLIM_SAVED_CUR and RLIM_SAVED_MAX are defined on Linux too as aliases of RLIM_INFINITY. They are a part of Posix, so should be defined everywhere (but may be useless).
10. serhiy-storchaka

    closed this as completedon Aug 19, 2025
11. encukou commented on Aug 19, 2025

    

    encukou

    on Aug 19, 2025

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    I did edit the message. The PR does add docs (and tests) for RLIMIT_PIPEBUF, and make other docs fixes.
12. Agent-Hellboy

    added a commit that references this issue on Aug 19, 2025

    pythongh-137512: Add new constants in the resource module (pythonGH-1…

    70f819d

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