Hi, memset(NULL, 0, 0) is (strictly speaking) undefined behaviour, but there's no reason that freezero(3) needs to follow suit.
This mentions that freezero(NULL, 0) is valid in the manpage, so that anyone who copies this API should get it right too. ok? Index: malloc.3 =================================================================== RCS file: /cvs/src/lib/libc/stdlib/malloc.3,v retrieving revision 1.115 diff -u -p -r1.115 malloc.3 --- malloc.3 15 May 2017 18:05:34 -0000 1.115 +++ malloc.3 24 Aug 2017 01:31:52 -0000 @@ -210,6 +210,12 @@ argument must be equal or smaller than t that returned .Fa ptr . .Fn freezero +may be called with a +.Dv NULL +pointer argument if the +.Fa size +argument is zero. +.Fn freezero guarantees the memory range starting at .Fa ptr with length
