On Fri, Feb 04, 2022 at 06:32:07PM +0300, Vitaly Chikunov wrote:
[...]
struct dirent *
qemu_dirent_dup(struct dirent *dent)
{
size_t sz = offsetof(struct dirent, d_name) + _D_EXACT_NAMLEN(dent) + 1;
But d_namlen is not populated by synth_direntry, so this will lead to
a bug too. Idea is that qemu_dirent_dup handles real dirents and
simulated (underpopulated) dirents.
Also Linux does not have d_namlen AFAIK, thus this code will not provide
any speed up in most cases (and always fallback to strlen), unlike if we
use d_reclen.
Also, I m not sure if _D_EXACT_NAMLEN is defined on all systems, so this
needs ifdefs too.
Yes, _D_EXACT_NAMLEN() is a GNU extension, it was introduced in glibc
back in 1996 but some popular libcs available for Linux do not provide
this macro.