strdup(NULL) supposed to create SIGSEGV?

Hi all,
     I made an oops in a program, which uncovered "feature" in strdup(2)
that I wasn't aware of before. So I was wondering, is strdup(pointer = NULL)
supposed to segfault should this just return NULL and set errno?
     Good news is that Linux does the same thing (yay?), so at least FreeBSD
isn't alone..

Sample:

[gcooper@optimus ~]$ ss="strdup_segfault"; gcc -o $ss $ss.c; ./$ss; cat
$ss.c
Segmentation fault: 11 (core dumped)
#include <string.h>

int
main() {
        const char *null_src_p = NULL;
        char *null_dest_p = strdup(null_src_p);
        return 0;
}

My sources are a bit old (last sync and userland recompile was mid~March)
but I don't think that libc changes all that often.

[gcooper@optimus ~]$ uname -a
FreeBSD optimus 8.0-CURRENT FreeBSD 8.0-CURRENT #10: Wed Apr 16 19:47:39 PDT
200
8     root@optimus:/usr/obj/usr/src/sys/OPTIMUS  i386

Thanks,
-Garrett
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