thread(2): fix description of when/why procexec(l) functions return
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@ -332,7 +332,8 @@ and
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on success,
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they replace the calling thread (which must be the only thread in its proc)
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and invoke the external program, never returning.
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On error, they return \-1.
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On error, they return and set
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.IR errstr .
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If
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.I cpid
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is not null, the pid of the invoked program
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