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@startuml exec-seq
"A" -> "S": +RUN_CMD
"A" -> "S": Command Frame
Create P
"S" -> "P": fork(), exec()
"A" -> "S": +STDIO
"A" -> "S": STDIO Frame
"A" -> "S": STDIO Data
"S" -> "P": STDIO Data
"P" -> "S": STDIO Data
"S" --> "A": STDIO
"S" --> "A": STDIO Frame
"S" --> "A": STDIO Data
Note across: Repeat ...
"A" -> "S": +STDIO
"A" -> "S": STDIO Frame len=0, fin
"S" -> "P": STDIN EOF
"P" -> "S": STDOUT EOF
"S" --> "A": STDIO
"S" --> "A": STDIO Frame len=0, fin
"P" -> "S": STDERR EOF
"S" --> "A": STDIO
"S" --> "A": STDIO Frame len=0, err, fin
"P" -> "P": exit()
"S" <-> "P" !!: waitpid()
Note over "P": Process reaped
"S" --> "A": Status
"S" --> "A": Status Frame
@enduml
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