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Questions and Answers
What type of system call is 'fork()'?
What type of system call is 'fork()'?
- Device management
- Information maintenance
- File management
- Process control (correct)
Which system call is used for opening a file?
Which system call is used for opening a file?
- ioctl()
- open() (correct)
- exit()
- wait()
In the context of system calls, what does 'ioctl()' mainly deal with?
In the context of system calls, what does 'ioctl()' mainly deal with?
- Device management (correct)
- Process attributes
- Time or date
- File attributes
Which system call is related to requesting a device?
Which system call is related to requesting a device?
What type of system call is 'write()' generally associated with?
What type of system call is 'write()' generally associated with?
'exit()' is associated with which type of system call?
'exit()' is associated with which type of system call?
What type of system programs provide a mechanism for creating virtual connections among processes, users, and different computer systems?
What type of system programs provide a mechanism for creating virtual connections among processes, users, and different computer systems?
Which type of system program is responsible for text editors that allow users to create and modify the content of files?
Which type of system program is responsible for text editors that allow users to create and modify the content of files?
What category of system programs includes compilers, interpreters, and assemblers?
What category of system programs includes compilers, interpreters, and assemblers?
Which type of system program provides a simple user interface to system calls but is not directly a system call itself?
Which type of system program provides a simple user interface to system calls but is not directly a system call itself?
Which type of system program offers features like creating, deleting, copying, renaming, printing, dumping, and listing files?
Which type of system program offers features like creating, deleting, copying, renaming, printing, dumping, and listing files?
What are the system programs that create an environment for program development and execution most users interact with?
What are the system programs that create an environment for program development and execution most users interact with?
What is the main goal of the OS feature known as SPOOL?
What is the main goal of the OS feature known as SPOOL?
In line with the text, which OS feature is crucial for multiprogramming to work effectively?
In line with the text, which OS feature is crucial for multiprogramming to work effectively?
What is a key aspect of the Time-Sharing/Multitasking Systems featured in the text?
What is a key aspect of the Time-Sharing/Multitasking Systems featured in the text?
Which data structure allows the OS to select jobs that run next in order to increase CPU utilization?
Which data structure allows the OS to select jobs that run next in order to increase CPU utilization?
What is the main purpose of having a faster disk act as a huge buffer in the SPOOL mechanism?
What is the main purpose of having a faster disk act as a huge buffer in the SPOOL mechanism?
Which OS feature is responsible for choosing one job to run among those in memory ready for execution?
Which OS feature is responsible for choosing one job to run among those in memory ready for execution?
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Study Notes
System Calls
fork(): A system call for creating a new process by duplicating the current process.- File Opening: The
open()system call is used for opening files. ioctl(): Primarily deals with device-specific input/output operations and control.- Device Request: The system call
ioctl()is also related to requesting a device. write(): Generally associated with system calls that manage output operations to files or devices.exit(): Associated with terminating a process and performing cleanup.
System Programs
- Virtual Connections: System programs provide mechanisms for creating virtual connections among processes and users, facilitating communication.
- Text Editors: Responsible for allowing users to create and modify the content of files.
- Compilers/Interpreters: Fall under the category of system programs that translate high-level programming code into machine code.
- User Interface to System Calls: System programs that provide an interface to system calls, simplifying their use without being direct system calls themselves.
- File Management Features: Programs that offer functionalities like creating, deleting, copying, renaming, printing, dumping, and listing files.
- Development and Execution Environment: System programs that help create an environment most users interact with for developing and executing programs.
Operating System Features
- SPOOL (Simultaneous Peripheral Operations Online): Aims to manage data for input and output by using faster disks as buffers to optimize processing.
- Multiprogramming: The essential OS feature crucial for enabling multiple processes to run concurrently, enhancing resource utilization.
- Time-Sharing/Multitasking Systems: Characterized by the ability to switch between multiple tasks, allowing users to execute various applications simultaneously.
- Job Selection Data Structure: Utilizes a scheduling algorithm or queue to determine which job runs next, thereby increasing CPU utilization.
- Job Execution Selection: The OS feature responsible for selecting one job to run among those in memory that are ready for execution, ensuring efficient CPU allocation.
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