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[libc] use PR_GET_AUXV only if UAPI provides it #162492

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Merged
merged 1 commit into from
Oct 8, 2025
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[libc] use PR_GET_AUXV only if UAPI provides it #162492

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6 changes: 4 additions & 2 deletions libc/src/__support/OSUtil/linux/auxv.h
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Original file line number Diff line number Diff line change
Expand Up @@ -96,15 +96,17 @@ LIBC_INLINE void Vector::fallback_initialize_unsync() {
}
size_t avaiable_size = AUXV_MMAP_SIZE - sizeof(Entry);

// Attempt 1: use PRCTL to get the auxv.
// We guarantee that the vector is always padded with AT_NULL entries.
// Attempt 1: use PRCTL to get the auxv.
// We guarantee that the vector is always padded with AT_NULL entries.
#ifdef PR_GET_AUXV
long prctl_ret = syscall_impl<long>(SYS_prctl, PR_GET_AUXV,
reinterpret_cast<unsigned long>(vector),
avaiable_size, 0, 0);
if (prctl_ret >= 0) {
entries = vector;
return;
}
#endif

// Attempt 2: read /proc/self/auxv.
#ifdef SYS_openat
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