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annotate packages/language/c/libc/current/cdl/stdio.cdl @ 76:435cced73e2f ecos-v1_3_1-release

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eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
author jlarmour
date Tue, 28 Mar 2000 14:10:45 +0000
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435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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1 # ====================================================================
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2 #
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3 # stdio.cdl
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4 #
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5 # C library stdio related configuration data
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6 #
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7 # ====================================================================
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8 #####COPYRIGHTBEGIN####
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9 #
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10 # -------------------------------------------
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11 # The contents of this file are subject to the Red Hat eCos Public License
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12 # Version 1.1 (the "License"); you may not use this file except in
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13 # compliance with the License. You may obtain a copy of the License at
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14 # http://www.redhat.com/
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15 #
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16 # Software distributed under the License is distributed on an "AS IS"
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17 # basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 # License for the specific language governing rights and limitations under
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19 # the License.
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20 #
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21 # The Original Code is eCos - Embedded Configurable Operating System,
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22 # released September 30, 1998.
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23 #
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24 # The Initial Developer of the Original Code is Red Hat.
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25 # Portions created by Red Hat are
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26 # Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 # All Rights Reserved.
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28 # -------------------------------------------
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29 #
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30 #####COPYRIGHTEND####
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31 # ====================================================================
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32 ######DESCRIPTIONBEGIN####
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33 #
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34 # Author(s): jskov
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35 # Original data: jlarmour
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36 # Contributors:
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37 # Date: 1999-07-06
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38 #
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39 #####DESCRIPTIONEND####
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40 #
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41 # ====================================================================
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42
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43
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44 cdl_option CYGIMP_LIBC_STDIO_INLINES {
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45 display "Inline versions of <stdio.h> functions"
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46 default_value 1
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47 description "
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48 This option chooses whether some of the
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49 particularly simple functions from
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50 <stdio.h> are available as inline
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51 functions. This may improve performance, and as
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52 the functions are small, may even improve code
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53 size."
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54 }
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55
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56 cdl_option FOPEN_MAX {
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57 display "Permitted number of open files"
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58 flavor data
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59 legal_values 3 to 0x7fffffff
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60 default_value 8
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61 description "
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62 This option controls the guaranteed minimum
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63 number of simultaneously open files. The ISO
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64 C standard requires it to be defined (para
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65 7.9.1), and if strictly compliant, it must be
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66 at least 8 (para 7.9.3). In practice it can be
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67 as low as 3 - for stdin, stdout and stderr."
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68 }
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69
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70 cdl_option FILENAME_MAX {
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71 display "Maximum length of filename"
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72 flavor data
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73 legal_values 1 to 0x7fffffff
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74 default_value 16
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75 description "
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76 This option defines the maximum allowed size of
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77 a filename in characters. The ISO C standard
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78 requires it to be defined (para 7.9.1)."
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79 }
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80
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81 cdl_option L_tmpnam {
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82 display "Maximum length of filenames for temporary files"
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83 flavor data
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84 legal_values 1 to 0x7fffffff
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85 default_value 16
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86 description "
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87 This option defines the maximum allowed size of
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88 filenames for temporary files as generated by
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89 tmpnam(). It is measured in characters, and the
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90 ISO C standard requires it to be defined (para
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91 7.9.1)."
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92 }
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93
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94 cdl_option TMP_MAX {
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95 display "Unique file names generated by tmpnam()"
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96 flavor data
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97 legal_values 0 to 0x7fffffff
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98 default_value 0
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99 description "
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100 This option defines the minimum number of
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101 unique file names generated by tmpnam(). The
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102 ISO C standard requires it to be defined (para
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103 7.9.1)."
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104 }
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105
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106 cdl_component CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO {
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107 display "Buffered I/O"
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108 flavor bool
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109 default_value 1
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110 description "
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111 This option controls whether input/output
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112 through the <stdio.h> functions is buffered.
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113 This may save some memory per file. It
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114 is equivalent to putting every file into
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115 non-buffered mode (_IONBF) through setvbuf(),
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116 except now it can never be altered back to
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117 buffered mode. Disabling buffering is strictly
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118 non-compliant with the ISO C standard."
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119
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120 cdl_option CYGNUM_LIBC_STDIO_BUFSIZE {
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121 display "Default buffer size"
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122 flavor data
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123 legal_values 1 to 0x7fffffff
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124 default_value 256
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125 description "
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126 This option defines the default size of buffer
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127 used with calls to setbuf(), and is the default
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128 size for buffered streams that have not had
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129 either setbuf() or setvbuf() invoked on them.
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130 It is exactly equivalent to the standard
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131 constant BUFSIZ, except that it is 0 if
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132 CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO is disabled.
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133 The ISO C standard requires this to be defined
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134 (para 7.9.1), and says it must be at least 256
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135 (para 7.9.2)."
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136 }
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137
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138 cdl_option CYGSEM_LIBC_STDIO_DYNAMIC_SETVBUF {
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139 display "setbuf()/setvbuf() uses malloc()"
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140 requires CYGPKG_LIBC_MALLOC
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141 default_value 0
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142 description "
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143 This option controls whether I/O buffers are
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144 implemented dynamically within the stdio
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145 implementation. Otherwise they will be static,
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146 and cannot be changed by setbuf()/setvbuf(). If
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147 they are static (i.e. this option is disabled),
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148 any attempt to use an arbitrary buffer size, or
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149 to pass a user-supplied buffer to setbuf() or
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150 setvbuf() will fail - the buffer is implemented
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151 internally as a static array of taking the size
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152 of the configuration option BUFSIZ. The only
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153 exception is if a user buffer is not supplied,
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154 and the buffer size requested is less than
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155 BUFSIZ. In this case, the buffer will
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156 be configured to only use that amount of
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157 buffering. However the unused memory left over
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158 will NOT be freed. If this option is enabled,
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159 then CYGPKG_LIBC_MALLOC must also
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160 be enabled. Either setting can be considered to
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161 be compliant with the ISO C standard."
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162 }
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163 }
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164 # Define BUFSIZ with same value as ..._BUFSIZE or 0
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165 cdl_option BUFSIZ {
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166 display "Default buffer size (BUFSIZ)"
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167 flavor data
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168 calculated CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO \
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169 ? "CYGNUM_LIBC_STDIO_BUFSIZE" : 0
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170 }
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171
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172 cdl_option CYGFUN_LIBC_STDIO_ungetc {
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173 display "Support for ungetc()"
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174 default_value 1
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175 description "
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176 This option controls whether ungetc() is
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177 supported. If not, then some space can be
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178 saved, and speed is improved. Note that you
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179 MUST have this defined if you want to use the
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180 scanf() family of functions."
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181 }
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182
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183 cdl_option CYGPKG_LIBC_STDIO_OPEN {
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184 display "Dynamic opening/closing of files"
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185 requires CYGPKG_LIBC_MALLOC
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186 default_value 1
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187 description "
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188 fopen() and fclose() use dynamic memory
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189 allocation routines to allocate memory for
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190 new FILE structure pointers. This option,
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191 along with CYGPKG_LIBC_MALLOC, should be
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192 enabled to use
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193 fopen() and fclose(). If disabled, only the
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194 default console streams - stdin, stdout and
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195 stderr - will be available."
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196 }
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197
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198 cdl_option CYGDAT_LIBC_STDIO_DEFAULT_CONSOLE {
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199 display "Default console device"
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200 flavor data
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201 default_value {"\"/dev/ttydiag\""}
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202 description "
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203 This option allows you to choose the
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204 default console device. In the current
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205 implementation, all these devices begin
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206 with the prefix /dev/ and are followed by
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207 the name of a device. The name of the device
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208 depends on the device drivers you have
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209 configured in your system. For example,
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210 /dev/ttydiag could be the HAL diagnostic output
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211 pseudo-device, or /dev/tty0 could be your
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212 first serial driver, depending on your
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213 configuration."
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214 }
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215
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216 cdl_component CYGPKG_LIBC_STDIO_FLOATING_POINT {
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217 display "Floating point support"
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218 flavor none
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219 description "
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220 This component allows floating point support
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221 to be enabled in certain standard I/O
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222 functions."
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223
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224 cdl_option CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT {
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225 display "printf() family"
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226 requires CYGPKG_LIBM
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227 default_value 1
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228 description "
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229 This option enables the use of floating point
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230 number output in the printf() family (i.e.
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231 printf(), sprintf(), vprintf(), etc.) of
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232 functions. A substantial amount of code space
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233 can be saved if this option is disabled. If it
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234 is disabled then floating point specifiers
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235 (%e, %f, %g) are ignored, and nothing is
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236 output."
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237 }
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238
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239 cdl_option CYGSEM_LIBC_STDIO_SCANF_FLOATING_POINT {
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240 display "scanf() family"
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241 requires CYGPKG_LIBM
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242 requires CYGFUN_LIBC_strtod
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243 default_value 1
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244 description "
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245 This option enables the use of floating point
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246 number conversion in the scanf() family (i.e.
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247 scanf(), sscanf(), vscanf(), etc.) of
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248 functions. A substantial amount of code space
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249 can be saved if this option is disabled. If it
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250 is disabled then floating point specifiers
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251 (%e, %f, %g) are ignored, and nothing is
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252 converted."
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253 }
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254 }
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255
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256 cdl_option CYGSEM_LIBC_STDIO_THREAD_SAFE_STREAMS {
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257 display "Thread safe I/O streams"
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258 requires CYGPKG_KERNEL
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259 default_value 1
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260 description "
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261 This option controls whether standard I/O streams
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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262 are thread-safe. Having this option set allows
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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263 the streams to be locked when accessed by
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264 multiple threads simultaneously."
435cced73e2f eCos v1.3.1 merged from eCos master repository on 2000-03-27-23:22:51-BST
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265 }