* YunQiang Su: > Florian Weimer <fw@xxxxxxxxxxxxx> 于2020年3月6日周五 下午7:42写道： >> >> * YunQiang Su: >> >> > AT_* only has 32 slot and now. I was afraid that maybe we shouldn't take one. >> > /* AT_* values 18 through 22 are reserved */ >> > 27,28,29,30 are not used now. >> > Which should we use? >> >> Where does this limit of 32 tags come from? I don't see it from a >> userspace perspective. > > Sorry it is my mistake: In linux/auxvec.h, I saw > > #define AT_RANDOM 25 /* address of 16 random bytes */ > #define AT_HWCAP2 26 /* extension of AT_HWCAP */ > > #define AT_EXECFN 31 /* filename of program */ > > The number jump to 31 from 26. > > It is my fault: in x86_64-linux-gnu/bits/auxv.h, the max number is 47 now. So AT_* tags aren't a scarce resource after all?
