diff options
Diffstat (limited to 'Doc/lib')
| -rw-r--r-- | Doc/lib/libos.tex | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/Doc/lib/libos.tex b/Doc/lib/libos.tex index 6dd733d..3d8d444 100644 --- a/Doc/lib/libos.tex +++ b/Doc/lib/libos.tex @@ -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. -Availability: \UNIX{}. +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} |