Fast open thousands of files in linux/c

Question

I am doing SDCARD scanner which scans each folder and image file.

I am using C code & using opendir, readdir, fopen APIs to enumerate directory and file open. i have dirent, DIR variables.

Problem is fopen() is taking too much time (300 sec for 10000 files) while director traversing is taking ~25 seconds.

Is there any API which allows me to speed up file open operation, using handle, dir_ino or similar so that i can open file using directory handle or similar.

So far i have looked n tried to use dirent->dir_ino, DIR* but no luck.

I m seeking for low-level api which takes lesser time than fopen.

edit will fts and ftw apis be usefull? they seems to be related to traversing directory only...any other hack or method?

Answer 1

The only "low level" function is open

int fd = open(dirent->d_name, O_RDONLY);

Though, fopen shouldn't be a lot slower.