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>System.Posix.Unistd</TITLE
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>unix-2.3.2.0: POSIX functionality</TD
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><A HREF="index.html"
>Contents</A
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><FONT SIZE="6"
>System.Posix.Unistd</FONT
></TD
><TD ALIGN="right"
><TABLE CLASS="narrow" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="infohead"
>Portability</TD
><TD CLASS="infoval"
>non-portable (requires POSIX)</TD
></TR
><TR
><TD CLASS="infohead"
>Stability</TD
><TD CLASS="infoval"
>provisional</TD
></TR
><TR
><TD CLASS="infohead"
>Maintainer</TD
><TD CLASS="infoval"
>libraries@haskell.org</TD
></TR
></TABLE
></TD
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><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
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><TD CLASS="section4"
><B
>Contents</B
></TD
></TR
><TR
><TD
><DL
><DT
><A HREF="#1"
>System environment
</A
></DT
><DT
><A HREF="#2"
>Sleeping
</A
></DT
></DL
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
>Description</TD
></TR
><TR
><TD CLASS="doc"
>POSIX miscellaneous stuff, mostly from unistd.h
</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"
><SPAN CLASS="keyword"
>data</SPAN
>  <A HREF="#t%3ASystemID"
>SystemID</A
>  = <A HREF="#v%3ASystemID"
>SystemID</A
> {<TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="recfield"
><A HREF="#v%3AsystemName"
>systemName</A
> :: <A HREF="../base/Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="recfield"
><A HREF="#v%3AnodeName"
>nodeName</A
> :: <A HREF="../base/Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="recfield"
><A HREF="#v%3Arelease"
>release</A
> :: <A HREF="../base/Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="recfield"
><A HREF="#v%3Aversion"
>version</A
> :: <A HREF="../base/Data-Char.html#t%3AString"
>String</A
></TD
></TR
><TR
><TD CLASS="recfield"
><A HREF="#v%3Amachine"
>machine</A
> :: <A HREF="../base/Data-Char.html#t%3AString"
>String</A
></TD
></TR
></TABLE
>}</TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgetSystemID"
>getSystemID</A
> :: <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> <A HREF="System-Posix-Unistd.html#t%3ASystemID"
>SystemID</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A HREF="#t%3ASysVar"
>SysVar</A
>  </TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="decl"
>= <A HREF="#v%3AArgumentLimit"
>ArgumentLimit</A
></TD
></TR
><TR
><TD CLASS="decl"
>| <A HREF="#v%3AChildLimit"
>ChildLimit</A
></TD
></TR
><TR
><TD CLASS="decl"
>| <A HREF="#v%3AClockTick"
>ClockTick</A
></TD
></TR
><TR
><TD CLASS="decl"
>| <A HREF="#v%3AGroupLimit"
>GroupLimit</A
></TD
></TR
><TR
><TD CLASS="decl"
>| <A HREF="#v%3AOpenFileLimit"
>OpenFileLimit</A
></TD
></TR
><TR
><TD CLASS="decl"
>| <A HREF="#v%3APosixVersion"
>PosixVersion</A
></TD
></TR
><TR
><TD CLASS="decl"
>| <A HREF="#v%3AHasSavedIDs"
>HasSavedIDs</A
></TD
></TR
><TR
><TD CLASS="decl"
>| <A HREF="#v%3AHasJobControl"
>HasJobControl</A
></TD
></TR
></TABLE
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3AgetSysVar"
>getSysVar</A
> :: <A HREF="System-Posix-Unistd.html#t%3ASysVar"
>SysVar</A
> -&gt; <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> <A HREF="../integer/GHC-Integer.html#t%3AInteger"
>Integer</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3Asleep"
>sleep</A
> :: <A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
> -&gt; <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3Ausleep"
>usleep</A
> :: <A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
> -&gt; <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="s8"
></TD
></TR
><TR
><TD CLASS="decl"
><A HREF="#v%3Ananosleep"
>nanosleep</A
> :: <A HREF="../integer/GHC-Integer.html#t%3AInteger"
>Integer</A
> -&gt; <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
><A NAME="1"
><A NAME="1"
>System environment
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A NAME="t:SystemID"
><A NAME="t%3ASystemID"
></A
></A
><B
>SystemID</B
>  </TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="section4"
>Constructors</TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="5" CELLPADDING="0"
><TR
><TD CLASS="arg"
><A NAME="v:SystemID"
><A NAME="v%3ASystemID"
></A
></A
><B
>SystemID</B
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="body" COLSPAN="2"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="arg"
><A NAME="v:systemName"
><A NAME="v%3AsystemName"
></A
></A
><B
>systemName</B
> :: <A HREF="../base/Data-Char.html#t%3AString"
>String</A
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:nodeName"
><A NAME="v%3AnodeName"
></A
></A
><B
>nodeName</B
> :: <A HREF="../base/Data-Char.html#t%3AString"
>String</A
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:release"
><A NAME="v%3Arelease"
></A
></A
><B
>release</B
> :: <A HREF="../base/Data-Char.html#t%3AString"
>String</A
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:version"
><A NAME="v%3Aversion"
></A
></A
><B
>version</B
> :: <A HREF="../base/Data-Char.html#t%3AString"
>String</A
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:machine"
><A NAME="v%3Amachine"
></A
></A
><B
>machine</B
> :: <A HREF="../base/Data-Char.html#t%3AString"
>String</A
></TD
><TD CLASS="rdoc"
></TD
></TR
></TABLE
></TD
></TR
></TABLE
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:getSystemID"
><A NAME="v%3AgetSystemID"
></A
></A
><B
>getSystemID</B
> :: <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> <A HREF="System-Posix-Unistd.html#t%3ASystemID"
>SystemID</A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><SPAN CLASS="keyword"
>data</SPAN
>  <A NAME="t:SysVar"
><A NAME="t%3ASysVar"
></A
></A
><B
>SysVar</B
>  </TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="0" CELLPADDING="0"
><TR
><TD CLASS="section4"
>Constructors</TD
></TR
><TR
><TD CLASS="body"
><TABLE CLASS="vanilla" CELLSPACING="1" CELLPADDING="0"
><TR
><TD CLASS="arg"
><A NAME="v:ArgumentLimit"
><A NAME="v%3AArgumentLimit"
></A
></A
><B
>ArgumentLimit</B
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:ChildLimit"
><A NAME="v%3AChildLimit"
></A
></A
><B
>ChildLimit</B
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:ClockTick"
><A NAME="v%3AClockTick"
></A
></A
><B
>ClockTick</B
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:GroupLimit"
><A NAME="v%3AGroupLimit"
></A
></A
><B
>GroupLimit</B
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:OpenFileLimit"
><A NAME="v%3AOpenFileLimit"
></A
></A
><B
>OpenFileLimit</B
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:PosixVersion"
><A NAME="v%3APosixVersion"
></A
></A
><B
>PosixVersion</B
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:HasSavedIDs"
><A NAME="v%3AHasSavedIDs"
></A
></A
><B
>HasSavedIDs</B
></TD
><TD CLASS="rdoc"
></TD
></TR
><TR
><TD CLASS="arg"
><A NAME="v:HasJobControl"
><A NAME="v%3AHasJobControl"
></A
></A
><B
>HasJobControl</B
></TD
><TD CLASS="rdoc"
></TD
></TR
></TABLE
></TD
></TR
></TABLE
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:getSysVar"
><A NAME="v%3AgetSysVar"
></A
></A
><B
>getSysVar</B
> :: <A HREF="System-Posix-Unistd.html#t%3ASysVar"
>SysVar</A
> -&gt; <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> <A HREF="../integer/GHC-Integer.html#t%3AInteger"
>Integer</A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="section1"
><A NAME="2"
><A NAME="2"
>Sleeping
</A
></A
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:sleep"
><A NAME="v%3Asleep"
></A
></A
><B
>sleep</B
> :: <A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
> -&gt; <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
></TD
></TR
><TR
><TD CLASS="doc"
><P
>Sleep for the specified duration (in seconds).  Returns the time remaining
 (if the sleep was interrupted by a signal, for example).
</P
><P
>GHC Note: the comment for <TT
><A HREF="System-Posix-Unistd.html#v%3Ausleep"
>usleep</A
></TT
> also applies here.
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:usleep"
><A NAME="v%3Ausleep"
></A
></A
><B
>usleep</B
> :: <A HREF="../ghc-prim/GHC-Types.html#t%3AInt"
>Int</A
> -&gt; <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="doc"
><P
>Sleep for the specified duration (in microseconds).
</P
><P
>GHC Note: Control.Concurrent.threadDelay is a better choice.
 Without the <TT
>-threaded</TT
> option, <TT
><A HREF="System-Posix-Unistd.html#v%3Ausleep"
>usleep</A
></TT
> will block all other user
 threads.  Even with the <TT
>-threaded</TT
> option, <TT
><A HREF="System-Posix-Unistd.html#v%3Ausleep"
>usleep</A
></TT
> requires a
 full OS thread to itself.  Control.Concurrent.threadDelay has
 neither of these shortcomings.
</P
></TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="decl"
><A NAME="v:nanosleep"
><A NAME="v%3Ananosleep"
></A
></A
><B
>nanosleep</B
> :: <A HREF="../integer/GHC-Integer.html#t%3AInteger"
>Integer</A
> -&gt; <A HREF="../base/System-IO.html#t%3AIO"
>IO</A
> <A HREF="../ghc-prim/GHC-Unit.html#t%3A%28%29"
>()</A
></TD
></TR
><TR
><TD CLASS="doc"
>Sleep for the specified duration (in nanoseconds)
</TD
></TR
><TR
><TD CLASS="s15"
></TD
></TR
><TR
><TD CLASS="botbar"
>Produced by <A HREF="http://www.haskell.org/haddock/"
>Haddock</A
> version 2.4.2</TD
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