[v12] Defer setting up enhanced recording until after PAM has completed #29580
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…9279) The reexec process now has a two way wait mechanism to allow the child process to complete any setup operations that may be required before the parent process starts enhanced recording. The old process was: 1) Parent launches child process 2) Child process opens PAM context and blocks on the continue signal 3) Parent sets up enhanced recording 4) Parent sends the continue signal 5) Child executes command/opens shell The new process is: 1) Parent launches child process and waits for child continue signal 2) Child process opens PAM context and then signals it has completed setup 3) Parent receives child continue signal and sets up enhanced recording 4) Parent sends the continue signal 5) Child executes command/opens shell Closes #29030
rosstimothy
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probakowski
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r0mant
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Backport #29279 to branch/v12