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-rw-r--r--src/malloc/mallocng/free.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/src/malloc/mallocng/free.c b/src/malloc/mallocng/free.c
index 40745f97..418a085c 100644
--- a/src/malloc/mallocng/free.c
+++ b/src/malloc/mallocng/free.c
@@ -119,7 +119,11 @@ void free(void *p)
if (((uintptr_t)(start-1) ^ (uintptr_t)end) >= 2*PGSZ && g->last_idx) {
unsigned char *base = start + (-(uintptr_t)start & (PGSZ-1));
size_t len = (end-base) & -PGSZ;
- if (len) madvise(base, len, MADV_FREE);
+ if (len) {
+ int e = errno;
+ madvise(base, len, MADV_FREE);
+ errno = e;
+ }
}
// atomic free without locking if this is neither first or last slot
@@ -139,5 +143,9 @@ void free(void *p)
wrlock();
struct mapinfo mi = nontrivial_free(g, idx);
unlock();
- if (mi.len) munmap(mi.base, mi.len);
+ if (mi.len) {
+ int e = errno;
+ munmap(mi.base, mi.len);
+ errno = e;
+ }
}