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Restore errno save/restore in pages_purge_process_madvise_impl

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TODO comment focused on free only, but this path is reachable via
other calls and it is safer to leave errno preservation here.
This commit is contained in:
Slobodan Predolac
2026-04-30 15:42:19 -07:00
parent 9ae0c1b6d3
commit 86f058287f
1 changed files with 2 additions and 0 deletions
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2
src/pages.c
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@@ -662,6 +662,7 @@ pages_purge_process_madvise_impl(
return true; return true;
} }
int saved_errno = get_errno();
size_t purged_bytes = (size_t)syscall(JE_SYS_PROCESS_MADVISE_NR, size_t purged_bytes = (size_t)syscall(JE_SYS_PROCESS_MADVISE_NR,
PIDFD_SELF, (struct iovec *)vec, vec_len, MADV_DONTNEED, 0); PIDFD_SELF, (struct iovec *)vec, vec_len, MADV_DONTNEED, 0);
if (purged_bytes == (size_t)-1) { if (purged_bytes == (size_t)-1) {
@@ -671,6 +672,7 @@ pages_purge_process_madvise_impl(
atomic_store_b( atomic_store_b(
&process_madvise_gate, false, ATOMIC_RELAXED); &process_madvise_gate, false, ATOMIC_RELAXED);
} }
set_errno(saved_errno);
} }
return purged_bytes != total_bytes; return purged_bytes != total_bytes;