Apply for the full-time Software Engineer position. On-campus interviews were conducted. Candidates were asked to answer several questions. There are four questions:

1. Explain the stack and heap areas in the process address space.

2. Implement the strncmp library function, bug-free.

3. How does the Linux file system implement access control?

4. For a web server receiving incoming requests, compare the following three approaches, detailing their pros and cons:

   1. One request, fork one process to respond.
   2. Process pool.
   3. Producer and consumer.

1. Explain the stack and heap areas in the process address space.

2. Implement the strncmp library function, bug-free.

3. How does the Linux file system implement access control?

4. Web server: incoming request. Compare the following three approaches, with pros and cons:

   1. One request, fork one process to respond.
   2. Process pool.
   3. Producer and consumer.