It is maybe a good idea if performance is a concern, as it bypasses the context switch (from user mode
to kernel mode and back) which is an expensive (time-consuming) operation, while providing a basic
level of protection from badly written programmes. However, it would be stupid not to put security checks
in the kernel libraries because the user-land C libraries can be freely attacked by malicious users and
programmes.
Titany answered the question on April 25, 2022 at 13:50
- Why must the operating system be more careful when accessing input to a system call (or
producing the result) when the data is in memory...(Solved)
Why must the operating system be more careful when accessing input to a system call (or
producing the result) when the data is in memory instead of registers?
Date posted: April 25, 2022. Answers (1)
- Using a simple system call as an example (e.g. getpid, or uptime), describe what is
generally involved in providing the result, from the point of...(Solved)
Using a simple system call as an example (e.g. getpid, or uptime), describe what is
generally involved in providing the result, from the point of calling the function in the C
library to the point where that function returns
Date posted: April 25, 2022. Answers (1)
- Describe the two general roles of an operating system, and elaborate why these roles are
important(Solved)
Describe the two general roles of an operating system, and elaborate why these roles are
important
Date posted: April 25, 2022. Answers (1)
- A computer had the following characteristics:
- Artificial intelligence
- Connectivity to the internet
- Superior hardware and software (i.e. high processing speed and storage capacity)
- Low emission...(Solved)
A computer had the following characteristics:
- Artificial intelligence
- Connectivity to the internet
- Superior hardware and software (i.e. high processing speed and storage capacity)
- Low emission of heat
- Smaller in size
State the generation described above.
Date posted: July 23, 2021. Answers (1)
- Name three non electronic tools that were used before the invention of electronic computers.(Solved)
Name three non electronic tools that were used before the invention of electronic computers.
Date posted: July 23, 2021. Answers (1)
- Write the following acronyms in full.
i. ICT
ii. CPU
iii. VLSI
iv. UPS(Solved)
Write the following acronyms in full.
i. ICT
ii. CPU
iii. VLSI
iv. UPS
Date posted: July 23, 2021. Answers (1)
- Give the correct name for the following descriptions.
i. A device that process user input to give out an output that is meaningful to the user.
ii....(Solved)
Give the correct name for the following descriptions.
i. A device that process user input to give out an output that is meaningful to the user.
ii. Raw facts that do not have much meaning to the user.
iii. The result obtained after processing.
Date posted: July 23, 2021. Answers (1)
- Define the term troubleshooting as used in operating systems.(Solved)
Define the term troubleshooting as used in operating systems.
Date posted: July 23, 2021. Answers (1)
- Explain how you can partition a hard disk into partitions.(Solved)
Explain how you can partition a hard disk into partitions.
Date posted: July 23, 2021. Answers (1)
- What is a startup disk?(Solved)
What is a startup disk?
Date posted: July 23, 2021. Answers (1)
- Explain how you would create backup using Windows back-up using utility.(Solved)
Explain how you would create backup using Windows back-up using utility.
Date posted: July 23, 2021. Answers (1)
- You have realized that your floppy disk is limited in storage space and you would wish to create more space.
Which tool in Windows would you...(Solved)
You have realized that your floppy disk is limited in storage space and you would wish to create more space.
Which tool in Windows would you use?
Date posted: July 23, 2021. Answers (1)
- Explain how you would move the taskbar to the top of the desktop.(Solved)
Explain how you would move the taskbar to the top of the desktop.
Date posted: July 23, 2021. Answers (1)
- Define the start menu and explain the common start menu items.(Solved)
Define the start menu and explain the common start menu items.
Date posted: July 23, 2021. Answers (1)
- Draw the information organization tree diagram.(Solved)
Draw the information organization tree diagram.
Date posted: July 23, 2021. Answers (1)
- Outline the factors that dictate how an Operating system organizes information.(Solved)
Outline the factors that dictate how an Operating system organizes information.
Date posted: July 23, 2021. Answers (1)
- Name and explain three types of human computer interfaces.(Solved)
Name and explain three types of human computer interfaces.
Date posted: July 23, 2021. Answers (1)
- Describe the Menu driven interface.(Solved)
Describe the Menu driven interface.
Date posted: July 23, 2021. Answers (1)
- Describe the Command line interface.(Solved)
Describe the Command line interface.
Date posted: July 23, 2021. Answers (1)
- State the disadvantages of command line interface.(Solved)
State the disadvantages of command line interface.
Date posted: July 23, 2021. Answers (1)