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

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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The 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.

  1. Is the variable result directly or indirectly visible, or not visible?
  2. Is the variable filelist[fid].owner directly or indirectly visible, or not visible?
  3. Is the variable filelist[fid].access_control directly or indirectly visible, or not visible?
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