According to theory_code.c
On Line B, the parent process uses waitpid(pid2, &status, 0); . If the programmer changed this to waitpid(-1, &status, 0); , how would the execution flow and output of the parent process change?

Question

According to theory_code.c 
 On Line B, the parent process uses  waitpid(pid2, &status, 0); . If the programmer changed this to  waitpid(-1, &status, 0); , how would the execution flow and output of the parent process change?

Answer

The parent would wait for both Child 1 and Child 2 simultaneously and store both of their exit codes in the  status  variable.

Answer

The parent would suspend until  any  child terminates, potentially reaping Child 1 first and incorrectly reporting its exit code as Child 2's.

Answer

The parent would ignore all child processes and immediately continue executing the rest of the code because of the -1 argument to waitpid.

Answer

The  waitpid  call would fail and return an error because  -1  is not a valid Process ID.

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According to theory_code.c On Line B, the parent process uses waitpid(pid2, &...

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