path: root/src/malloc/posix_memalign.c
diff options
authorRich Felker <>2013-07-04 23:58:16 -0400
committerRich Felker <>2013-07-04 23:58:16 -0400
commit6d861ac87491a207e4599c44b61d142f0a601c2d (patch)
tree2458b79e37b144f13fb5190a7bcf777d1b9b883a /src/malloc/posix_memalign.c
parent651416182dc65d75e91cadfec65dd72f9ff07846 (diff)
move core memalign code from aligned_alloc to __memalign
there are two motivations for this change. one is to avoid gratuitously depending on a C11 symbol for implementing a POSIX function. the other pertains to the documented semantics. C11 does not define any behavior for aligned_alloc when the length argument is not a multiple of the alignment argument. posix_memalign on the other hand places no requirements on the length argument. using __memalign as the implementation of both, rather than trying to implement one in terms of the other when their documented contracts differ, eliminates this confusion.
Diffstat (limited to 'src/malloc/posix_memalign.c')
1 files changed, 3 insertions, 1 deletions
diff --git a/src/malloc/posix_memalign.c b/src/malloc/posix_memalign.c
index ad4d8f47..cf67db63 100644
--- a/src/malloc/posix_memalign.c
+++ b/src/malloc/posix_memalign.c
@@ -1,10 +1,12 @@
#include <stdlib.h>
#include <errno.h>
+void *__memalign(size_t, size_t);
int posix_memalign(void **res, size_t align, size_t len)
if (align < sizeof(void *)) return EINVAL;
- void *mem = aligned_alloc(align, len);
+ void *mem = __memalign(align, len);
if (!mem) return errno;
*res = mem;
return 0;