Which of the following techniques can help keep system programs secure?

Calling mmap(0, 4096, PROT_READ | PROT_WRITE, MAP_SHARED, input_fd, 4096), where input_fd is the file descriptor of a 16KB file will cause which of the following to occur?

Wha does the following line do? unsigned transOK : 1;

The result of calling kill(6003, 0) is which of the following?

An Internet socket connection essentially is:

How can two processes communicate despite having firewalls between them?

Which option of the compiler is turned on to generate additional debug information (like the source code) for debugging an application?

Which gcc compiler option turns on optimization?

The library routine printf does not use any system calls.

If a process is hung in the kernel context, sending it a SIGKILL will _____.

Which one is true of Unix system calls?