following system call adds read permission for a process (for_pid) if the caller (call_pid) owns the file, and does nothing otherwise. (The operating system supplies call_ pid; the caller supplies the two latter parameters.) function addread(call_pid, for_pid: process_id; fid: file_id): integer; begin if (call_pid = filelist[fid].owner) then addright(filelist[fid].access_control_list, for_pid, "r"); result := (call_pid - filelist[fid].owner); return result end. Is the variable result directly or indirectly visible, or not visible? Is the variable filelist[fid].owner directly or indirectly visible, or not visible? Is the variable filelist[fid].access_control

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Linux

An operating system (OS) is the software which manages hardware and resources, like CPU, storage and memory. The OS bridges the applications and hardware and makes the connections between all of your software and the hardware resources.