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Explain the C code and rearrange part of it

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I have two questions about the attached code and then a slight modification needs to be made to the code.

1. Please explain exactly what this code is doing as it is written right now.

2. Where is the code following (textually) the "switch" block executed - in the parent process or in the child process? The first instruction following the "switch" block is "act.sa_handler = setflag".

3. Change the code so that no code appears _textually_ after the "switch" block. All the code following the "switch" block must be placed somewhere else, yet the effect of the "tml" command must be the same.

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In question 2, it also explains "why" behind the answer.

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1. This code is creating a child process which first sets up a signal handler to process SIGALRM signals and then an alarm for minutes specified by the user as the first argument on command line. After that the child process pauses ...

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