<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML ><HEAD ><TITLE >unistd.h</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="Implementing a System Call on Linux 2.6 for i386" HREF="index.html"><LINK REL="PREVIOUS" TITLE="syscall_table.S" HREF="x50.html"><LINK REL="NEXT" TITLE="syscalls.h" HREF="x74.html"></HEAD ><BODY CLASS="sect1" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >Implementing a System Call on Linux 2.6 for i386</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="x50.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="x74.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="sect1" ><H1 CLASS="sect1" ><A NAME="AEN59" ></A >6. unistd.h</H1 ><P >Full path of the file - /usr/src/linux/include/asm-i386/unistd.h</P ><P >This file contains the system call number that is passed to the kernel through the register (EAX) when a system call is invoked. </P ><P ></P ><OL TYPE="1" ><LI ><P >Add "#define __NR_mycall <Last_System_Call_Num + 1>" at the end of the list.</P ></LI ></OL ><P >If the last system call defined here is:</P ><P >"#define __NR_vmsplice316", then add:</P ><P >"#define __NR_mycall317" at the end of the list.</P ><P ></P ><OL TYPE="1" ><LI ><P >Increment the "NR_syscalls" by 1. So, if NR_syscalls is defined as:</P ></LI ></OL ><P >"#define NR_syscalls 317", then change it to:</P ><P >"#define NR_syscalls 318"</P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="x50.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="x74.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >syscall_table.S</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" > </TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >syscalls.h</TD ></TR ></TABLE ></DIV ></BODY ></HTML >