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* Added execute permissions to files missed in conversion from CVS
author alexs
date Mon, 12 Oct 2009 02:26:09 +0100
parents 7c1c8dc43ba1
children
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1 <!-- Copyright (C) 2002 Red Hat, Inc. -->
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2 <!-- This material may be distributed only subject to the terms -->
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3 <!-- and conditions set forth in the Open Publication License, v1.0 -->
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4 <!-- or later (the latest version is presently available at -->
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5 <!-- http://www.opencontent.org/openpub/). -->
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6 <!-- Distribution of the work or derivative of the work in any -->
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7 <!-- standard (paper) book form is prohibited unless prior -->
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8 <!-- permission is obtained from the copyright holder. -->
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9 <HTML
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10 ><HEAD
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11 ><TITLE
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12 >System Calls</TITLE
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13 ><meta name="MSSmartTagsPreventParsing" content="TRUE">
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14 <META
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15 NAME="GENERATOR"
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16 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
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17 "><LINK
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18 REL="HOME"
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19 TITLE="eCos Synthetic Target"
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20 HREF="hal-synth-arch.html"><LINK
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21 REL="PREVIOUS"
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22 TITLE="The Console Device"
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23 HREF="synth-console.html"><LINK
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24 REL="NEXT"
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25 TITLE="Writing New Devices - target"
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26 HREF="synth-new-target.html"></HEAD
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27 ><BODY
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28 CLASS="REFENTRY"
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29 BGCOLOR="#FFFFFF"
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30 TEXT="#000000"
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31 LINK="#0000FF"
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32 VLINK="#840084"
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33 ALINK="#0000FF"
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34 ><DIV
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35 CLASS="NAVHEADER"
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36 ><TABLE
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37 SUMMARY="Header navigation table"
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38 WIDTH="100%"
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39 BORDER="0"
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40 CELLPADDING="0"
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41 CELLSPACING="0"
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42 ><TR
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43 ><TH
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44 COLSPAN="3"
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45 ALIGN="center"
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46 >eCos Synthetic Target</TH
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47 ></TR
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48 ><TR
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49 ><TD
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50 WIDTH="10%"
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51 ALIGN="left"
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52 VALIGN="bottom"
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53 ><A
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54 HREF="synth-console.html"
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55 ACCESSKEY="P"
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56 >Prev</A
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57 ></TD
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58 ><TD
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59 WIDTH="80%"
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60 ALIGN="center"
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61 VALIGN="bottom"
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62 ></TD
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63 ><TD
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64 WIDTH="10%"
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65 ALIGN="right"
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66 VALIGN="bottom"
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67 ><A
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68 HREF="synth-new-target.html"
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69 ACCESSKEY="N"
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70 >Next</A
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71 ></TD
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72 ></TR
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73 ></TABLE
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74 ><HR
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75 ALIGN="LEFT"
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76 WIDTH="100%"></DIV
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77 ><H1
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78 ><A
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79 NAME="SYNTH-SYSCALLS">System Calls</H1
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80 ><DIV
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81 CLASS="REFNAMEDIV"
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82 ><A
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83 NAME="AEN483"
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84 ></A
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85 ><H2
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86 >Name</H2
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87 >cyg_hal_sys_xyz&nbsp;--&nbsp;Access Linux system facilities</DIV
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88 ><DIV
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89 CLASS="REFSYNOPSISDIV"
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90 ><A
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91 NAME="AEN486"><H2
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92 >Synopsis</H2
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93 ><DIV
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94 CLASS="FUNCSYNOPSIS"
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95 ><A
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96 NAME="AEN487"><P
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97 ></P
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98 ><TABLE
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99 BORDER="5"
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100 BGCOLOR="#E0E0F0"
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101 WIDTH="70%"
208
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102 ><TR
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103 ><TD
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104 ><PRE
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105 CLASS="FUNCSYNOPSISINFO"
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106 >#include &lt;cyg/hal/hal_io.h
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107 </PRE
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108 ></TD
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109 ></TR
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110 ></TABLE
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111 ><P
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112 ><CODE
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113 ><CODE
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114 CLASS="FUNCDEF"
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115 >int cyg_hal_sys_xyzzy</CODE
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116 >(...);</CODE
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117 ></P
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118 ><P
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119 ></P
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120 ></DIV
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121 ></DIV
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122 ><DIV
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123 CLASS="REFSECT1"
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124 ><A
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125 NAME="SYNTH-SYSCALLS-DESCRIPTION"
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126 ></A
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127 ><H2
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128 >Description</H2
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129 ><P
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130 >On a real embedded target eCos interacts with the hardware by peeking
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131 and poking various registers, manipulating special regions of memory,
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132 and so on. The synthetic target does not access hardware directly.
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133 Instead I/O and other operations are emulated by making appropriate
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134 Linux system calls. The HAL package exports a number of functions
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135 which allow other packages, or even application code, to make these
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136 same system calls. However this facility must be used with care: any
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137 code which calls, for example, <TT
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138 CLASS="FUNCTION"
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139 >cyg_hal_sys_write</TT
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140 >
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141 will only ever run on the synthetic target; that functionality is
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142 obviously not provided on any real hardware because there is no
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143 underlying Linux kernel to implement it.
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144 </P
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145 ><P
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146 >The synthetic target only provides a subset of the available system
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147 calls, specifically those calls which have proved useful to implement
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148 I/O emulation. This subset can be extended fairly easily if necessary.
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149 All of the available calls, plus associated data structures and
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150 macros, are defined in the header file <TT
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151 CLASS="FILENAME"
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152 >cyg/hal/hal_io.h</TT
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153 >. There is a simple
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154 convention: given a Linux system call such as
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155 <TT
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156 CLASS="FUNCTION"
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157 >open</TT
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158 >, the synthetic target will prefix
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159 <TT
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160 CLASS="LITERAL"
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161 >cyg_hal_sys</TT
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162 > and provide a function with that name.
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163 The second argument to the <TT
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164 CLASS="FUNCTION"
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165 >open</TT
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166 > system call is
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167 a set of flags such as <TT
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168 CLASS="CONSTANT"
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169 >O_RDONLY</TT
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170 >, and the header
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171 file will define a matching constant
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172 <TT
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173 CLASS="CONSTANT"
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174 >CYG_HAL_SYS_O_RDONLY</TT
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175 >. There are also data
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176 structures such as <SPAN
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177 CLASS="STRUCTNAME"
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178 >cyg_hal_sys_sigset_t</SPAN
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179 >,
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180 matching the Linux data structure <SPAN
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181 CLASS="STRUCTNAME"
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182 >sigset_t</SPAN
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183 >.
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184 </P
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185 ><P
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186 >In most cases the functions provided by the synthetic target behave as
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187 per the documentation for the Linux system calls, and section 2 of the
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188 Linux man pages can be consulted for more information. There is one
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189 important difference: typically the documentation will say that a
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190 function returns <TT
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191 CLASS="LITERAL"
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192 >-1</TT
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193 > to indicate an error, with the
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194 actual error code held in <TT
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195 CLASS="VARNAME"
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196 >errno</TT
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197 >; the actual
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198 underlying system call and hence the
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199 <TT
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200 CLASS="FUNCTION"
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201 >cyg_hal_sys_xyz</TT
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202 > provided by eCos instead returns
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203 a negative number to indicate an error, with the absolute value of
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204 that number corresponding to the error code; usually it is the C
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205 library which handles this and manipulates errno, but of course
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206 synthetic target applications are not linked with that Linux library.
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207 </P
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208 ><P
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209 >However, there are some exceptions. The Linux kernel has evolved over
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210 the years, and some of the original system call interfaces are no
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211 longer appropriate. For example the original
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212 <TT
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213 CLASS="FUNCTION"
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214 >select</TT
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215 > system call has been superseded by
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216 <TT
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217 CLASS="FUNCTION"
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218 >_newselect</TT
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219 >, and that is what the
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220 <TT
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221 CLASS="FUNCTION"
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222 >select</TT
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223 > function in the C library actually uses.
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224 The old call is still available to preserve binary compatibility but,
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225 like the C library, eCos makes use of the new one because it provides
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226 the appropriate functionality. In an attempt to reduce confusion the
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227 eCos function is called <TT
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228 CLASS="FUNCTION"
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229 >cyg_hal_sys__newselect</TT
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230 >,
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231 in other words it matches the official system call naming scheme. The
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232 authoritive source of information on such matters is the Linux kernel
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233 sources themselves, and especially its header files.
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234 </P
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235 ><P
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236 >eCos packages and applications should never
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237 <TT
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238 CLASS="LITERAL"
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239 >#include</TT
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240 > Linux header files directly. For example,
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241 doing a <TT
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242 CLASS="LITERAL"
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243 >#include&nbsp;&lt;/usr/include/fcntl.h&gt;</TT
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244 >
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245 to access additional macros or structure definitions, or alternatively
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246 manipulating the header file search path, will lead to problems
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247 because the Linux header files are likely to duplicate and clash with
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248 definitions in the eCos headers. Instead the appropriate functionality
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249 should be extracted from the Linux headers and moved into either
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250 <TT
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251 CLASS="FILENAME"
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252 >cyg/hal/hal_io.h</TT
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253 > or into
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254 application code, with suitable renaming to avoid clashes with eCos
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255 names. Users should be aware that large-scale copying may involve
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256 licensing complications.
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257 </P
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258 ><P
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259 >Adding more system calls is usually straightforward and involves
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260 adding one or more lines to the platform-specific file in the
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261 appropriate platform HAL, for example
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262 <TT
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263 CLASS="FILENAME"
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264 >syscall-i386-linux-1.0.S</TT
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265 >. However it is necessary
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266 to do some research first about the exact interface implemented by the
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267 system call, because of issues such as old system calls that have been
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268 superseded. The required information can usually be found fairly
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269 easily by searching through the Linux kernel sources and possibly the
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270 GNU C library sources.
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271 </P
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272 ></DIV
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273 ><DIV
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274 CLASS="NAVFOOTER"
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275 ><HR
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276 ALIGN="LEFT"
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277 WIDTH="100%"><TABLE
332
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278 SUMMARY="Footer navigation table"
208
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279 WIDTH="100%"
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280 BORDER="0"
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281 CELLPADDING="0"
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282 CELLSPACING="0"
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283 ><TR
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284 ><TD
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285 WIDTH="33%"
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286 ALIGN="left"
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287 VALIGN="top"
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288 ><A
332
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289 HREF="synth-console.html"
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290 ACCESSKEY="P"
208
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291 >Prev</A
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292 ></TD
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293 ><TD
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294 WIDTH="34%"
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295 ALIGN="center"
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296 VALIGN="top"
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297 ><A
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298 HREF="hal-synth-arch.html"
332
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299 ACCESSKEY="H"
208
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300 >Home</A
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301 ></TD
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302 ><TD
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303 WIDTH="33%"
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304 ALIGN="right"
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305 VALIGN="top"
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306 ><A
332
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307 HREF="synth-new-target.html"
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308 ACCESSKEY="N"
208
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309 >Next</A
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310 ></TD
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311 ></TR
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312 ><TR
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313 ><TD
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314 WIDTH="33%"
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315 ALIGN="left"
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316 VALIGN="top"
332
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317 >The Console Device</TD
208
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318 ><TD
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319 WIDTH="34%"
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320 ALIGN="center"
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321 VALIGN="top"
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322 >&nbsp;</TD
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323 ><TD
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324 WIDTH="33%"
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325 ALIGN="right"
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326 VALIGN="top"
332
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327 >Writing New Devices - target</TD
208
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328 ></TR
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329 ></TABLE
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330 ></DIV
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331 ></BODY
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332 ></HTML
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333 >