perfSONAR User Q&A and Other Discussion

[Brian Candler <>]

On 10/12/2014 20:59, Brian Candler wrote:
> - wrong size passed to memcpy/memcmp: sizeof(sid), where sid is 
> function argument uid8_t[16], gives sizeof(uid8_t*) instead
(Demo below)

It occurs to me that this could cause an incompatibility between current 
and fixed software, if the old software sets only 8 bytes of sid but the 
fixed software compares all 16 bytes.

Maybe it's better just to fix the memcpy() calls for now, and leave 
memcmp() to match only 8 bytes (with a comment to this effect). Then in 
a few generations, fix the memcmp calls too.

Regards,

Brian.

---- 8< ----
#include <stdio.h>

typedef unsigned char BWLSID[16];

static void foo(BWLSID sid)
{
   printf("%ld\n", (long)sizeof(sid));
}

int main(void)
{
   BWLSID sid;
   printf("%ld\n", (long)sizeof(sid));
   foo(sid);
   return 0;
}

When I run this, I get:

16
8