Which system call can be used by a parent process to determine the termination of child process 1 point a wait B exit c Fork d get?
Table of Contents
- 1 Which system call can be used by a parent process to determine the termination of child process 1 point a wait B exit c Fork d get?
- 2 Which system call used when parent terminate the execution of child process as child has exceeded allocated resources?
- 3 Which system call is used after a fork () to replace the process’s memory space with a new process?
- 4 Which system call is used to terminate the process?
- 5 Which system call does not return control to the calling point on termination?
- 6 How are system calls executed?
- 7 What system call terminates a process on UNIX system?
- 8 What is system calls in operating system?
- 9 Can a system call be invoked by the parent process?
- 10 How does an operating system return data to the parent process?
Which system call can be used by a parent process to determine the termination of child process 1 point a wait B exit c Fork d get?
wait() system call
Explanation: wait() system call is used by the parent process to determine termination of child process. The parent process uses wait() system call and gets the exit status of the child process as well as the pid of the child process which is terminated.
Which system call used when parent terminate the execution of child process as child has exceeded allocated resources?
wait system call
Explanation: The child process completes execution, but the parent keeps executing, then the child process is known as Zombie. When a child process terminates, its resources get deallocated but its entry in the Process Control Block (PCB) remains there until its parent calls wait system call.
Which system call is used to create a process?
The fork() system call is used to create processes. When a process (a program in execution) makes a fork() call, an exact copy of the process is created.
Which system call is used after a fork () to replace the process’s memory space with a new process?
The fork system call creates a new process. The new process created by fork() is a copy of the current process except for the returned value. The exec() system call replaces the current process with a new program.
Which system call is used to terminate the process?
The exit() system call is used by a program to terminate its execution.
Which of the following system call is used for process termination?
The exit() system call is used to terminate program execution. Specially in the multi-threaded environment, this call defines that the thread execution is complete. The OS reclaims resources that were used by the process after the use of exit() system call.
Which system call does not return control to the calling point on termination?
Discussion Forum
| Que. | Which of the following system calls does not return control to the calling point, on termination? |
|---|---|
| b. | exec |
| c. | ioctl |
| d. | longjmp |
| Answer:exec |
How are system calls executed?
When a user program invokes a system call, a system call instruction is executed, which causes the processor to begin executing the system call handler in the kernel protection domain. This system call handler performs the following actions: Sets the ut_error field in the uthread structure to 0.
What is fork system call return?
The fork() System Call. System call fork() is used to create processes. fork() returns a zero to the newly created child process. fork() returns a positive value, the process ID of the child process, to the parent.
What system call terminates a process on UNIX system?
The _exit( ) system call terminates a process. The kernel handles this system call by releasing the resources owned by the process and sending the parent process a SIGCHLD signal, which is ignored by default.
What is system calls in operating system?
In computing, a system call (commonly abbreviated to syscall) is the programmatic way in which a computer program requests a service from the kernel of the operating system on which it is executed. System calls provide an essential interface between a process and the operating system.
What happens to the child process when the parent process is terminated?
The child process exceeded to its usage of the specific resources that are assigned to it. If the parent process terminated the operating system does not allow it child process to continue its execution. If a process terminated either normally or abnormally then all of its child processes must also be terminated.
Can a system call be invoked by the parent process?
Generally, this kind of system call can be invoked by the parent process only that is to be terminated. Otherwise users could subjectively kill each other’s jobs. The parent requires to know the identities of its children.
How does an operating system return data to the parent process?
At this point the process may return output data to its parent process via the wait system call. All the resources of the process including open files, physical and virtual memory and I/O operations are deallocated by operating system return back.
What is cascading termination in Linux?
The above phenomenon is called as cascading termination which is usually initiated by the operating system. To demonstrate the process execution and termination the exit () system call is used to terminate the process execution and its parent process may wait for that event by using the wait system call.