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Taddeüs Kroes
uva
Commits
5f6c1008
Commit
5f6c1008
authored
Nov 07, 2010
by
Sander Mathijs van Veen
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Added implementation details to the report of OS ass 3.
parent
b4298d2e
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os/ass3/report/report.tex
View file @
5f6c1008
...
@@ -249,6 +249,12 @@ for i in {1..6}; do ./fish < input$i.txt; \
...
@@ -249,6 +249,12 @@ for i in {1..6}; do ./fish < input$i.txt; \
\subsection
{
Signal verwerking
}
\subsection
{
Signal verwerking
}
In stap
7
wordt gevraagd om een signal handler in te bouwen in de bigfish. Met
deze signal handler kunnen signal worden opgevangen en in dit geval schrijft de
handler een bericht naar
\texttt
{
stdout
}
met de ontvangen signal. Voordat de
bigfish leest van
\texttt
{
stdin
}
, worden de signal handlers als volgt
toegewezen:
\begin
{
lstlisting
}
[
numbers
=
none,backgroundcolor
=
\color
{
darkgray
}
]
\begin
{
lstlisting
}
[
numbers
=
none,backgroundcolor
=
\color
{
darkgray
}
]
/*
Bind signal handlers
*/
/*
Bind signal handlers
*/
if
(
sigaction
(
SIGINT,
&
action, NULL
)
if
(
sigaction
(
SIGINT,
&
action, NULL
)
...
@@ -262,6 +268,19 @@ if( sigaction(SIGINT, &action, NULL)
...
@@ -262,6 +268,19 @@ if( sigaction(SIGINT, &action, NULL)
% wait() beschrijven.
% wait() beschrijven.
\noindent
In de man page van
\texttt
{
sigaction
}
\footnote
{
http:
//
www.kernel.org
/
doc
/
man
-
pages
/
online
/
pages
/
man
2
/
sigaction.
2
.html
}
staat een
\emph
{
flag
}
met betrekking tot zombieprocessen en
\texttt
{
SIGCHLD
}
:
\\
\\
\texttt
{
SA
\_
NOCLDWAIT
(
since Linux
2
.
6
)
\\
If signum is SIGCHLD, do not
transform children into zombies when they terminate. This flag is only
meaningful when establishing a handler for SIGCHLD.
}
\\
\\
Met die flag worden kindprocessen niet op defunct gezet, maar direct
vrijgegeven. Daardoor is er geen
\texttt
{
wait
()
}
meer nodig binnen de signal
handler.
\pagebreak
\pagebreak
\begin
{
appendices
}
\begin
{
appendices
}
...
...
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