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.Dd May 23, 2006 .Dt MALLOC_SIZE 3 .Os .Sh NAME .Nm malloc_good_size , .Nm malloc_size .Nd memory allocation information .Sh SYNOPSIS n malloc/malloc.h .Ft size_t .Fo malloc_good_size .Fa "size_t size" .Fc .Ft size_t .Fo malloc_size .Fa "const void *ptr" .Fc .Sh DESCRIPTION The .Fn malloc_size function returns the size of the memory block that backs the allocation pointed to by .Fa ptr . The memory block size is always at least as large as the allocation it backs, and may be larger.

p The .Fn malloc_good_size function rounds .Fa size up to a value that the allocator implementation can allocate without adding any padding; it then returns that rounded-up value. .Sh SEE ALSO .Xr malloc 3