1.
I'm trying to understand VALGRIND_DISCARD(addr, size) client request.
My understanding is that it will suppress any errors related to specified address range.
addr = mmap(..., 0x10, ...);
VALGRIND_DISCARD(VALGRIND_MAKE_MEM_NOACCESS(addr, 0x10));
memset(addr, 1, 0x1);
I thought above code will not report any error messages.
But there is invalid write error.
2.
VALGRIND_MAKE_MEM_NOACCESS(DEFINED,UNDEFINED)
- suppose to return block handle
- return zero when not run on valgrind
- I got -1 for all three macros (is -1 valid?)
VALGRIND_DISCARD return
- 0: valid handle
- 1: invalid handle
- always return 1 because above 3 macro return -1
OS: Ubuntu 9.04 on vmware
Valgrind: valgrind-3.4.1-Debian
Thank you
Sean
