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1 //======================================================================== |
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2 // |
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3 // fflush.cxx |
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4 // |
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5 // Implementation of C library file flush function as per ANSI 7.9.5.2 |
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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 Cygnus eCos Public License |
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12 // Version 1.0 (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://sourceware.cygnus.com/ecos |
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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 Cygnus Operating System, released |
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22 // September 30, 1998. |
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23 // |
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24 // The Initial Developer of the Original Code is Cygnus. Portions created |
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25 // by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions. All Rights Reserved. |
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26 // ------------------------------------------- |
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27 // |
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28 //####COPYRIGHTEND#### |
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29 //======================================================================== |
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30 //#####DESCRIPTIONBEGIN#### |
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31 // |
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32 // Author(s): jlarmour |
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33 // Contributors: jlarmour |
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34 // Date: 1999-01-21 |
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35 // Purpose: Provides ISO C fflush() function |
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36 // Description: |
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37 // Usage: |
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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 // CONFIGURATION |
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44 |
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45 #include <pkgconf/libc.h> // Configuration header |
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46 |
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47 // Do we want the stdio stuff? |
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48 #ifdef CYGPKG_LIBC_STDIO |
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49 |
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50 // INCLUDES |
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51 |
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52 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions |
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53 #include <stddef.h> // NULL and size_t from compiler |
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54 #include <errno.h> // Error codes |
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55 #include <stdio.h> // header for fflush() |
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56 #include "clibincl/stream.hxx" // C library streams |
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57 #include "clibincl/stdiofiles.hxx" // C library files |
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58 #include "clibincl/stdiosupp.hxx" // support for stdio |
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59 |
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60 |
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61 // EXPORTED SYMBOLS |
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62 |
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63 externC int |
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64 fflush( FILE * ) CYGBLD_ATTRIB_WEAK_ALIAS(_fflush); |
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65 |
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66 |
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67 // FUNCTIONS |
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68 |
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69 // flush all but one stream |
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70 externC Cyg_ErrNo |
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71 cyg_libc_stdio_flush_all_but( Cyg_StdioStream *not_this_stream ) |
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72 { |
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73 cyg_bool files_flushed[FOPEN_MAX] = { false }; // sets all to 0 |
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74 cyg_bool loop_again; |
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75 cyg_ucount32 i; |
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76 Cyg_ErrNo err=ENOERR; |
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77 Cyg_StdioStream *stream; |
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78 |
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79 do { |
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80 loop_again = false; |
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81 |
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82 for (i=0; (i<FOPEN_MAX) && !err; i++) { |
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83 if (files_flushed[i] == false) { |
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84 |
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85 stream = Cyg_libc_stdio_files::get_file_stream(i); |
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86 |
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87 if ((stream == NULL) || (stream == not_this_stream)) { |
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88 // if it isn't a valid stream, set its entry in the |
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89 // list of files flushed since we don't want to |
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90 // flush it |
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91 // Ditto if its the one we're meant to miss |
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92 |
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93 files_flushed[i] = true; |
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94 } // if |
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95 else { |
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96 // valid stream |
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97 |
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98 if ( stream->trylock_me() ) { |
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99 err = stream->flush_output_unlocked(); |
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100 stream->unlock_me(); |
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101 files_flushed[i] = true; |
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102 } // if |
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103 else |
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104 loop_again = true; |
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105 } // else |
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106 } // if |
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107 } // for |
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108 } // do |
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109 while(loop_again && !err); |
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110 |
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111 return err; |
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112 } // cyg_libc_stdio_flush_all_but() |
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113 |
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114 externC int |
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115 _fflush( FILE *stream ) |
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116 { |
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117 Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream; |
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118 Cyg_ErrNo err; |
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119 |
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120 if (stream == NULL) { // tells us to flush ALL streams |
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121 err = cyg_libc_stdio_flush_all_but(NULL); |
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122 } // if |
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123 else { |
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124 err = real_stream->flush_output(); |
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125 } // else |
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126 |
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127 if (err) { |
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128 errno = err; |
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129 return EOF; |
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130 } // if |
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131 |
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132 return 0; |
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133 |
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134 } // _fflush() |
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135 |
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136 #endif // ifdef CYGPKG_LIBC_STDIO |
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137 |
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138 // EOF fflush.cxx |
