enforce_sbrk 81 user/testbin/badcall/bad_sbrk.c enforce_sbrk(4096*1024*256, "huge positive", ENOMEM); enforce_sbrk 88 user/testbin/badcall/bad_sbrk.c enforce_sbrk(-4096*1024*256, "huge negative", EINVAL); enforce_sbrk 95 user/testbin/badcall/bad_sbrk.c enforce_sbrk(-8192, "too-large negative", EINVAL);