How I can know if a user has the permission to read a file or not ?

Hello,
I have other question :
How I can know if a user has the permission to read a file or not ?
Smaine
ThanK's

I don't think common operating systems have an easy way to do that check.
If you have a limited number of files, implement access control yourself, instead of using operating system permissions. E.g. write a configuration file that contains:
# Syntax: "filename": "list of users who can access that file"
somefile.txt: fred, alice, bob
somedir/anotherfile.txt: bob, joe
Read in the configuration file and check against it when a file is being requested.

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