<HTML ><HEAD ><TITLE >$B%W%m%0%i%`$NNc(B</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.54"><LINK REL="HOME" TITLE="Linux I/O $B%]!<%H%W%m%0%i%_%s%0(B mini-HOWTO" HREF="index.html"><LINK REL="PREVIOUS" TITLE="$B%H%i%V%k%7%e!<%H(B" HREF="troubleshooting.html"><LINK REL="NEXT" TITLE="$B<U<-(B" HREF="credits.html"></HEAD ><BODY CLASS="SECT1" BGCOLOR="#FFFFFF" TEXT="#000000" ><DIV CLASS="NAVHEADER" ><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >Linux I/O $B%]!<%H%W%m%0%i%_%s%0(B mini-HOWTO</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="troubleshooting.html" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="credits.html" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="EXAMPLE-CODE" >9. $B%W%m%0%i%`$NNc(B</A ></H1 ><P >$B$3$l$O!"(BI/O $B%]!<%H%"%/%;%9$NC1=c$J%3!<%G%#%s%0Nc$G$9(B:</P ><P > <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="PROGRAMLISTING" >/* * example.c: $B$H$C$F$b4JC1$J%]!<%H(BI/O$B$NNc(B * * $B$J$K$bLr$K$?$D$3$H$O$7$F$$$^$;$s!#%]!<%H$K=q$-9~$_!"0l;~Dd;_$7$F!"(B * $B%]!<%H$+$iFI$_=P$9$@$1$G$9!#!V(Bgcc -O2 -o example example.c$B!W$G(B * $B%3%s%Q%$%k$7$F!"%k!<%H%f!<%6$K$J$C$F!V(B./example$B!W$G<B9T$7$F$/$@$5$$!#(B */ #include <stdio.h> #include <unistd.h> #include <asm/io.h> #define BASEPORT 0x378 /* lp1 */ int main() { /* $B%]!<%H$X$N%"%/%;%95v2D$rF@$k(B */ if (ioperm(BASEPORT, 3, 1)) {perror("ioperm"); exit(1);} /* $B%]!<%H$N%G!<%?(B (D0-D7)$B$rA4$F(B low (0) $B$K$9$k(B */ outb(0, BASEPORT); /* $B$7$P$i$/$N4V(B (100 ms) $B%9%j!<%W(B */ usleep(100000); /* $B%9%F!<%?%9%]!<%H(B (BASE+1) $B$+$iFI$_=P$7$F!"I=<($9$k(B */ printf("status: %d\n", inb(BASEPORT + 1)); /* $B$b$&%]!<%H$r;H$o$J$$$N$G8e;OKv(B */ if (ioperm(BASEPORT, 3, 0)) {perror("ioperm"); exit(1);} exit(0); } /* example.c $B$*$o$j(B */</PRE ></TD ></TR ></TABLE > </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="troubleshooting.html" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="credits.html" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >$B%H%i%V%k%7%e!<%H(B</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" > </TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >$B<U<-(B</TD ></TR ></TABLE ></DIV ></BODY ></HTML >