c - How to detect when one file is modified inside a symbolic link directory in Linux -


i have symbolic link 1 directory this

root@beaglebone:/sys/class/drm#     lrwxrwxrwx 1 root root 0 sat jan 1 00:00:01 2000 card0-hdmi-a-1 -> /sys/devices/ocp.3/4830e000.lcdc/drm/card0/card0-hdmi-a-1

how can detect/watch when 1 file modified inside real path (/sys/devices/ocp.3/4830e000.lcdc/drm/card0/card0-hdmi-a-1) symbolic link (/sys/class/drm/card0-hdmi-a-1) points to.

(i prefer c program this).

thanks much.

the command looking stat. stat retrieves data file (in *nix, directory kind of file). when used on symbolic link, stat return data on link points to, not link itself. stat populates struct stat, st_mtime member time of last modification, directory, update when contents change.

struct stat file_info;  if ( stat ( "/sys/class/drm/card0-hdmi-a-1", &file_info ) == 0 ) {   /* stat succeeded, file_info.st_mtime real directory's mod time */ } else {   /* stat failed reason. consult man page info error codes */ }

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