Enable os.memfd_create through runtime weak linking#1164
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Package Debian's linux-libc-dev headers as a build dependency for *-linux-gnu targets. This new linux-uapi package provides userspace header from a modern Linux kernel (currently 7.0.12). When building CPython on *-linux-gnu targets use these headers to enable modern kernel features, such as os.pidfp_open. At runtime if the kernel does not support the needed syscalls ENOSYS will be returned.
Verify that no sysconfig variables contains the build-only linux-uapi path.
Verify that building against the modern Linux UAPI headers enables os.pidfd_open on GNU/Linux targets.
jjhelmus
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We should definitely try to upstream any weak linking implementations |
zanieb
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Jun 25, 2026
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Always build CPython with
os.memfd_createbut remove the Python function from the namespace at runtime when glibc does not provide the an implementation.This is accomplished using a weak
memfd_createsymbol which is evaluated at runtime.This requires the modern kernel UAPI headers from #1163 to define the
MFD_*constants.