In FUSE, how do I get the information about the user and the process that is trying to read/write in the virtual file system? [closed]

Question

Say I created a FUSE filesystem called foo and mounted it at /mnt/foo.

If I have a user called myuser that is running vi to open a file in /mnt/foo, what FUSE methods or data structure contains the info about the user and process? I'd want the actual name of the user/group and process, or the RUID and PID.

I've been staring at this but I can't find the information I mention from the doxygen documentation.

Answer 1

During the call to a fuse operation you can call fuse_get_context() to get the current calling user id, group id, process id, and umask in a fuse_context Struct.

struct fuse_context {
        struct fuse *fuse;
        uid_t uid;
        gid_t gid;
        pid_t pid;
        void *private_data;
        mode_t umask;
};

Here's a doc and bsd man page mentioning this function.