fchmodat
int fchmodat(int fd, const char* path, mode_t mode, int flag);
extern int fchmodat(int fd, const char *path, mode_t mode, int flag);
if (fchmodat(parentFD, entryName, entry->Mode() & ALLPERMS,
return fchmodat(fd, path, mode, flag);
HIDDEN_FUNCTION(fchmodat);