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gh-153400: Support os.getrandom() on old glibc versions (#155762)
Use the libc-provided SYS_getrandom syscall number when available, falling back to the kernel-provided __NR_getrandom when necessary.
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‎Misc/NEWS.d/next/Build/2026-08-14-20-16-55.gh-issue-153400.9Oxi-N.rst‎

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Support os.getrandom() when building Python with old glibc versions and recent Linux kernel (glibc 2.25 or older and Linux kernel 3.17 or newer). Get the syscall number from kernel headers, rather than glibc headers.

‎Modules/posixmodule.c‎

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#ifdef HAVE_SYS_SYSCALL_H
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# include <sys/syscall.h> // syscall(), __NR_xxx syscall numbers
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#endif
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#if !defined(SYS_getrandom) && defined(__NR_getrandom)
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# define SYS_getrandom __NR_getrandom
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#endif
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#ifdef HAVE_POSIX_SPAWN
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# include <spawn.h> // posix_spawn()

‎Python/bootstrap_hash.c‎

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# include <sys/random.h> // getrandom()
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# endif
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# if !defined(HAVE_GETRANDOM) && defined(HAVE_GETRANDOM_SYSCALL)
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# include <sys/syscall.h> // SYS_getrandom
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# include <sys/syscall.h> // __NR_getrandom, SYS_getrandom
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# if !defined(SYS_getrandom) && defined(__NR_getrandom)
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# define SYS_getrandom __NR_getrandom
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# endif
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# endif
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#endif
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‎configure‎

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‎configure.ac‎

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#include <stddef.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <linux/random.h>
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#include <linux/random.h> // GRND_NONBLOCK
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#if !defined(SYS_getrandom) && defined(__NR_getrandom)
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# define SYS_getrandom __NR_getrandom
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#endif
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int main(void) {
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char buffer[1];

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