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Explain the possible range of values for the pid parameter to

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waitpid().
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Fred Drake 1999-08-13 13:36:33 +00:00
parent af5725104b
commit 31e5e37196
1 changed files with 13 additions and 5 deletions
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18
Doc/lib/libos.tex
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@ -745,12 +745,20 @@ Availability: \UNIX{}.
\end{funcdesc}
\begin{funcdesc}{waitpid}{pid, options}
Wait for completion of a child process given by process id, and return
a tuple containing its process id and exit status indication (encoded
as for \function{wait()}). The semantics of the call are affected by
the value of the integer \var{options}, which should be \code{0} for
normal operation.
Wait for completion of a child process given by process id \var{pid},
and return a tuple containing its process id and exit status
indication (encoded as for \function{wait()}). The semantics of the
call are affected by the value of the integer \var{options}, which
should be \code{0} for normal operation.
Availability: \UNIX{}.
If \var{pid} is greater than \code{0}, \function{waitpid()} requests
status information for that specific process. If \var{pid} is
\code{0}, the request is for the status of any child in the process
group of the current process. If \var{pid} is \code{-1}, the request
pertains to any child of the current process. If \var{pid} is less
than \code{-1}, status is requested for any process in the process
group \code{-\var{pid}} (the absolute value of \var{pid}).
\end{funcdesc}
\begin{datadesc}{WNOHANG}