PermissionExt.mode() octal representation

help
1

Hello,

I'm currently build a programm that analyzes permissions, and since I'm working on Linux, I'm using PermissionsExt.

When converting the u32 result from the mode function into a octal representation, I'm getting output like:

0o40755
0o100644

Surely the last 3 digits are the masked permission groups, but what does the prepended data mean?

Thanks for any advice.

2

That value comes from the st_mode field off the stat system call. The includes both the standard permission bits, but also includes file type information that the C macros S_ISDIR etc look at: stat(2): file status - Linux man page

3

Thanks for your answer.

4

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