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A process makes a system call to read a packet from the network

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A process makes a system call to read a packet from the network device, and blocks. The scheduler then context-switches this process out. This an example of an involuntary context switch.

Consider two machines A and B of different architectures, running two different operating systems OS-A and OS-B. Both operating systems are POSIX compliant. The source code of an application that is written to run on machine A must always berewritten to run on machine B.

 

fork(); printf("b"); return 0;

}

Assuming fork() might fail (by returning an error code and not creating a new process) and printf() prints its outputs immediately (no buffering occurs), what are the

 

possible outputs of the program? Note: More than one answer.

 

 

 

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