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- What is the normal sequence of events when a child process uses unnamed pipes to read the parent's message buffer?When a child process reads the parent's message buffer using unnamed pipes, what should happen next?What is the typical sequence of events when a child process reads the parent's message buffer using unnamed pipes?
- What typically happens when a child process accesses the parent's message buffer via unnamed pipes?What is the typical sequence of events associated when a child process reads the message buffer of the parent using unnamed pipes?Suppose that a parent process spawns two child processes, and each of those children spawns its own child. If all four children terminate before the SIGCHLD signal is delivered to the parent for the first time, how many times will the parent's SIGCHLD signal handler be called?
- Exercise 2: Draw a State machine Diagram for a Telephone line (a process in a smartphone OS) with the following behavior: When the telephone app is not active, the telephone line is idle. When the app is activated, the line gives a dial tone and can accept the dialing of digits. If after getting the dial tone, the user doesn't dial a number within a time interval of 10 seconds, then a time-out occurs, and the line gets idle again. A button on the app can re- activate the line. After dialing a number, if the number is invalid then a recorded message is played at the end of which the line becomes idle. Upon entry of a valid number, the phone app tries to connect a call & routes it to the proper destination. If the called person answers the phone, the conversation can occur, and the line is in an on- call state. When the called person hangs up, the phone app disconnects and the line goes to the idle state.Write a C program that creates two child processes. The first child will send the parent SIGUSR1 and the parents will respond with a message. The second child will send the parent SIGUSR2 and the parent will respond with a messageMassages exchange between managers is possible in: A) SNMPv2 only B) SNMPv1 & SNMPv2 C) SNMPv2 & SNMPv3 D) SNMPv1 only
- When a child process makes use of unnamed pipes to access the message buffer of the parent process, what normally occurs?sleep() is a system call? What are the steps that occur from the time when a call to sleep() is made by a process up to the time that it returns?Argument transmission is a weakness in many operating systems' security systems. Both nested routines often use a similar shared stack for arguments as well as the remainder of the background of each calling method. (a) Describe the flaws that this vulnerability exposes. (b) Describe how the flaw can be mitigated. The shared stack can also be used for statement passing and background storage.