<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <!--Rendered using the Haskell Html Library v0.2--> <HTML ><HEAD ><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8" ><TITLE >System.Daemon</TITLE ><LINK HREF="haddock.css" REL="stylesheet" TYPE="text/css" ><SCRIPT SRC="haddock-util.js" TYPE="text/javascript" ></SCRIPT ><SCRIPT TYPE="text/javascript" >window.onload = function () {setSynopsis("mini_System-Daemon.html")};</SCRIPT ></HEAD ><BODY ><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0" ><TR ><TD CLASS="topbar" ><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0" ><TR ><TD ><IMG SRC="haskell_icon.gif" WIDTH="16" HEIGHT="16" ALT=" " ></TD ><TD CLASS="title" >MissingH-1.1.0.3: Large utility library</TD ><TD CLASS="topbut" ><A HREF="src/System-Daemon.html" >Source code</A ></TD ><TD CLASS="topbut" ><A HREF="index.html" >Contents</A ></TD ><TD CLASS="topbut" ><A HREF="doc-index.html" >Index</A ></TD ></TR ></TABLE ></TD ></TR ><TR ><TD CLASS="modulebar" ><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0" ><TR ><TD ><FONT SIZE="6" >System.Daemon</FONT ></TD ><TD ALIGN="right" ><TABLE CLASS="narrow" CELLSPACING="0" CELLPADDING="0" ><TR ><TD CLASS="infohead" >Portability</TD ><TD CLASS="infoval" >portable to platforms with POSIX process\/signal tools</TD ></TR ><TR ><TD CLASS="infohead" >Stability</TD ><TD CLASS="infoval" >provisional</TD ></TR ><TR ><TD CLASS="infohead" >Maintainer</TD ><TD CLASS="infoval" >John Goerzen <jgoerzen@complete.org></TD ></TR ></TABLE ></TD ></TR ></TABLE ></TD ></TR ><TR ><TD CLASS="s15" ></TD ></TR ><TR ><TD CLASS="section1" >Description</TD ></TR ><TR ><TD CLASS="doc" ><P >Tools for writing daemons/server processes </P ><P >Written by John Goerzen, jgoerzen@complete.org </P ><P >Please note: Most of this module is not compatible with Hugs. </P ><P >Messages from this module are logged under <TT >System.Daemon</TT >. See System.Log.Logger for details. </P ><P >Based on background from <A HREF="http://www.erlenstar.demon.co.uk/unix/faq_2.html#SEC16" >http://www.erlenstar.demon.co.uk/unix/faq_2.html#SEC16</A > and <A HREF="http://www.haskell.org/hawiki/HaskellUnixDaemon" >http://www.haskell.org/hawiki/HaskellUnixDaemon</A >. </P ><P >This module is not available on Windows. </P ></TD ></TR ><TR ><TD CLASS="s15" ></TD ></TR ><TR ><TD CLASS="section1" >Synopsis</TD ></TR ><TR ><TD CLASS="s15" ></TD ></TR ><TR ><TD CLASS="body" ><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0" ><TR ><TD CLASS="decl" ><A HREF="#v%3AdetachDaemon" >detachDaemon</A > :: <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO" >IO</A > <A HREF="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t%3A%28%29" >()</A ></TD ></TR ></TABLE ></TD ></TR ><TR ><TD CLASS="s15" ></TD ></TR ><TR ><TD CLASS="section1" >Documentation</TD ></TR ><TR ><TD CLASS="s15" ></TD ></TR ><TR ><TD CLASS="topdecl" ><TABLE CLASS="declbar" ><TR ><TD CLASS="declname" ><A NAME="v:detachDaemon" ><A NAME="v%3AdetachDaemon" ></A ></A ><B >detachDaemon</B > :: <A HREF="/usr/share/doc/ghc/html/libraries/base-4.2.0.2/System-IO.html#t%3AIO" >IO</A > <A HREF="/usr/share/doc/ghc/html/libraries/ghc-prim-0.2.0.0/GHC-Unit.html#t%3A%28%29" >()</A ></TD ><TD CLASS="declbut" ><A HREF="src/System-Daemon.html#detachDaemon" >Source</A ></TD ></TR ></TABLE ></TD ></TR ><TR ><TD CLASS="doc" ><P >Detach the process from a controlling terminal and run it in the background, handling it with standard Unix deamon semantics. </P ><P >After running this, please note the following side-effects: </P ><UL ><LI > The PID of the running process will change </LI ><LI > stdin, stdout, and stderr will not work (they'll be set to /dev/null) </LI ><LI > CWD will be changed to / </LI ></UL ><P >I <EM >highly</EM > suggest running this function before starting any threads. </P ><P >Note that this is not intended for a daemon invoked from inetd(1). </P ></TD ></TR ><TR ><TD CLASS="s15" ></TD ></TR ><TR ><TD CLASS="botbar" >Produced by <A HREF="http://www.haskell.org/haddock/" >Haddock</A > version 2.6.1</TD ></TR ></TABLE ></BODY ></HTML >