Sergei Gorelkin wrote:
It turns out that for longer filenames fpreaddir() failes with errno=22
(invalid argument).
Here is what I could find out:
In fpc, sizeof(dirent) is equal to 275, while gcc reports
sizeof(dirent64)=276. Moreover, Linux kernel expects buffer for
getdents64 syscall rounded up to 8 bytes (see fs/readdir.c in kernel
source tree, macros ROUND_UP64 and NAME_OFFSET). Using these macros, we
can calculate that for 255 char filename, a 280-byte buffer is expected
(and value of 280 *is* returned in d_reclen field when filename length
is 255). But that is still not working, for the reason I could not
figure out. Only adding eight more bytes, i.e. using 288 bytes buffer,
makes that syscall finally succeed with a 255 char filename.
A quick fix seems to just extend Dirent record with extra bytes, but
perhaps there exists a more clean and consistent solution.
Best regards,
Sergei.
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