> >
> >#define _DIRENT_RECLEN(dp, namlen) \     
> >    ((_DIRENT_NAMEOFF(dp) + (namlen) + 1 + 0xf) & ~0xf)
> >
> >Does this 0xF alignment hold for all variants of dirent?
> 
> Unfortunately not. Our on-disk struct direct and struct dirent12 use 0x3.
> I thought about parameterizing this one, but did not. instead i do:
> 
> #define _DIRENT12_RECLEN(dp, namlen) \     
>     ((_DIRENT_NAMEOFF(dp) + (namlen) + 1 + 0x3) & ~0x3)
> 
> I thought about defining the # in another macro or using some 
> ugliness like:
> 
> #define _DIRENT_ALIGN(dp)
> 	(/*CONSTCOND*/sizeof(dp->d_namlen) == sizeof(uint8_t) ? 0x3 : 0xf)
> 
> #define _DIRENT_RECLEN(dp, namlen) \     
>     ((_DIRENT_NAMEOFF(dp) + (namlen) + 1 + _DIRENT_ALIGN(dp)) & \
>     ~_DIRENT_ALIGN(dp))
> 
> but I decided to use a separate macro..

How does readdir(3) locate the next directory entry?
Using dp->d_reclen or DIRENT_RECLEN?