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<HTML><HEAD><TITLE>Recipe 16.13. Listing Available Signals (Perl Cookbook)</TITLE><METANAME="DC.title"CONTENT="Perl Cookbook"><METANAME="DC.creator"CONTENT="Tom Christiansen & Nathan Torkington"><METANAME="DC.publisher"CONTENT="O'Reilly & Associates, Inc."><METANAME="DC.date"CONTENT="1999-07-02T01:44:08Z"><METANAME="DC.type"CONTENT="Text.Monograph"><METANAME="DC.format"CONTENT="text/html"SCHEME="MIME"><METANAME="DC.source"CONTENT="1-56592-243-3"SCHEME="ISBN"><METANAME="DC.language"CONTENT="en-US"><METANAME="generator"CONTENT="Jade 1.1/O'Reilly DocBook 3.0 to HTML 4.0"><LINKREV="made"HREF="mailto:online-books@oreilly.com"TITLE="Online Books Comments"><LINKREL="up"HREF="ch16_01.htm"TITLE="16. Process Management and Communication"><LINKREL="prev"HREF="ch16_13.htm"TITLE="16.12. Sharing Variables in Different Processes"><LINKREL="next"HREF="ch16_15.htm"TITLE="16.14. Sending a Signal"></HEAD><BODYBGCOLOR="#FFFFFF"><img alt="Book Home" border="0" src="gifs/smbanner.gif" usemap="#banner-map" /><map name="banner-map"><area shape="rect" coords="1,-2,616,66" href="index.htm" alt="Perl Cookbook"><area shape="rect" coords="629,-11,726,25" href="jobjects/fsearch.htm" alt="Search this book" /></map><div class="navbar"><p><TABLEWIDTH="684"BORDER="0"CELLSPACING="0"CELLPADDING="0"><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="228"><ACLASS="sect1"HREF="ch16_13.htm"TITLE="16.12. Sharing Variables in Different Processes"><IMGSRC="../gifs/txtpreva.gif"ALT="Previous: 16.12. Sharing Variables in Different Processes"BORDER="0"></A></TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="228"><B><FONTFACE="ARIEL,HELVETICA,HELV,SANSERIF"SIZE="-1"><ACLASS="chapter"REL="up"HREF="ch16_01.htm"TITLE="16. Process Management and Communication"></A></FONT></B></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="228"><ACLASS="sect1"HREF="ch16_15.htm"TITLE="16.14. Sending a Signal"><IMGSRC="../gifs/txtnexta.gif"ALT="Next: 16.14. Sending a Signal"BORDER="0"></A></TD></TR></TABLE></DIV><DIVCLASS="sect1"><H2CLASS="sect1"><ACLASS="title"NAME="ch16-96143">16.13. Listing Available Signals</A></H2><DIVCLASS="sect2"><H3CLASS="sect2"><ACLASS="title"NAME="ch16-pgfId-1000005337">Problem</A></H3><PCLASS="para"><ACLASS="indexterm"NAME="ch16-idx-1000006374-0"></A><ACLASS="indexterm"NAME="ch16-idx-1000006374-1"></A><ACLASS="indexterm"NAME="ch16-idx-1000006374-2"></A><ACLASS="indexterm"NAME="ch16-idx-1000006374-3"></A>You want to know the signals your operating system provides.</P></DIV><DIVCLASS="sect2"><H3CLASS="sect2"><ACLASS="title"NAME="ch16-pgfId-1000005340">Solution</A></H3><PCLASS="para">If your shell has a built-in <ICLASS="filename">kill -l</I> command, use it:</P><PRECLASS="programlisting">% kill -l<CODECLASS="userinput"><B><CODECLASS="replaceable"><I>HUP INT QUIT ILL TRAP ABRT BUS FPE KILL USR1 SEGV USR2 PIPE </I></CODE></B></CODE><CODECLASS="userinput"><B><CODECLASS="replaceable"><I>ALRM TERM CHLD CONT STOP TSTP TTIN TTOU URG XCPU XFSZ VTALRM </I></CODE></B></CODE><CODECLASS="userinput"><B><CODECLASS="replaceable"><I>PROF WINCH POLL PWR</I></CODE></B></CODE></PRE><PCLASS="para">Or using just Perl, print the keys in <CODECLASS="literal">%SIG</CODE> if you have release 5.004 or later:</P><PRECLASS="programlisting">% perl -e 'print join(" ", keys %SIG), "\n"'<CODECLASS="userinput"><B><CODECLASS="replaceable"><I>XCPU ILL QUIT STOP EMT ABRT BUS USR1 XFSZ TSTP INT IOT USR2 INFO TTOU</I></CODE></B></CODE><CODECLASS="userinput"><B><CODECLASS="replaceable"><I>ALRM KILL HUP URG PIPE CONT SEGV VTALRM PROF TRAP IO TERM WINCH CHLD</I></CODE></B></CODE><CODECLASS="userinput"><B><CODECLASS="replaceable"><I>FPE TTIN SYS</I></CODE></B></CODE></PRE><PCLASS="para">Before version 5.004, you had to use the Config module:</P><PRECLASS="programlisting">% perl -MConfig -e 'print $Config{sig_name}'<CODECLASS="userinput"><B><CODECLASS="replaceable"><I>ZERO HUP INT QUIT ILL TRAP ABRT EMT FPE KILL BUS SEGV SYS PIPE ALRM</I></CODE></B></CODE><CODECLASS="userinput"><B><CODECLASS="replaceable"><I>TERM URG STOP TSTP CONT CHLD TTIN TTOU IO XCPU XFSZ VTALRM PROF WINCH</I></CODE></B></CODE><CODECLASS="userinput"><B><CODECLASS="replaceable"><I>INFO USR1 USR2 IOT</I></CODE></B></CODE></PRE></DIV><DIVCLASS="sect2"><H3CLASS="sect2"><ACLASS="title"NAME="ch16-pgfId-1000005357">Discussion</A></H3><PCLASS="para">If your version of Perl is before 5.004, you have to use <CODECLASS="literal">signame</CODE> and <CODECLASS="literal">signo</CODE> in Config to find the list of available signals, since <CODECLASS="literal">keys</CODE> <CODECLASS="literal">%SIG</CODE> wasn't implemented then.</P><PCLASS="para">The following code retrieves by name and number the available signals from Perl's standard Config.pm module. Use <CODECLASS="literal">@signame</CODE> indexed by number to get the signal name, and <CODECLASS="literal">%signo</CODE> indexed by name to get the signal number.</P><PRECLASS="programlisting">use Config;defined $Config{sig_name} or die "No sigs?";$i = 0; # Config prepends fake 0 signal called "ZERO".foreach $name (split(' ', $Config{sig_name})) { $signo{$name} = $i; $signame[$i] = $name; $i++;}</PRE></DIV><DIVCLASS="sect2"><H3CLASS="sect2"><ACLASS="title"NAME="ch16-pgfId-1000005369">See Also</A></H3><PCLASS="para">The documentation for the standard Config module, also in <ACLASS="olink"HREF="../prog/ch07_01.htm">Chapter 7</A> of <ACLASS="citetitle"HREF="../prog/index.htm"TITLE="Programming Perl"><CITECLASS="citetitle">Programming Perl</CITE></A>; the <ACLASS="olink"HREF="../prog/ch06_02.htm#PERL2-CH-6-SECT-2.1">"Signals"</A> sections in <ACLASS="olink"HREF="../prog/ch06_01.htm">Chapter 6</A> of <ACLASS="citetitle"HREF="../prog/index.htm"TITLE="Programming Perl"><CITECLASS="citetitle">Programming Perl</CITE></A> and in <ICLASS="filename">perlipc </I>(1)</P></DIV></DIV><DIVCLASS="htmlnav"><P></P><HRALIGN="LEFT"WIDTH="684"TITLE="footer"><TABLEWIDTH="684"BORDER="0"CELLSPACING="0"CELLPADDING="0"><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="228"><ACLASS="sect1"HREF="ch16_13.htm"TITLE="16.12. 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