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annotate packages/language/c/libc/stdio/current/src/common/fflush.cxx @ 2717:c301264acb03 before-copyright-change-20090121

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* src/common/fflush.cxx (cyg_libc_stdio_flush_all_but): Fix silly typo in last change.
author jlarmour
date Sun, 18 Jan 2009 03:44:22 +0000
parents 22602f09ebbd
children 74dbf4c3f2e1
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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 //========================================================================
208
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license/
208
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
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40 //========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): jlarmour
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44 // Contributors:
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45 // Date: 2000-04-20
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46 // Purpose: Provides ISO C fflush() function
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47 // Description:
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48 // Usage:
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49 //
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50 //####DESCRIPTIONEND####
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51 //
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52 //========================================================================
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53
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54 // CONFIGURATION
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55
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56 #include <pkgconf/libc_stdio.h> // Configuration header
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57
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58 // INCLUDES
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59
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60 #include <cyg/infra/cyg_type.h> // Common project-wide type definitions
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61 #include <stddef.h> // NULL and size_t from compiler
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62 #include <errno.h> // Error codes
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63 #include <stdio.h> // header for fflush()
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64 #include <cyg/libc/stdio/stream.hxx>// C library streams
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65 #include <cyg/libc/stdio/stdiofiles.hxx> // C library files
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66 #include <cyg/libc/stdio/stdiosupp.hxx> // support for stdio
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67
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68 // FUNCTIONS
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69
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70 // flush all but one stream
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71 externC Cyg_ErrNo
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72 cyg_libc_stdio_flush_all_but( Cyg_StdioStream *not_this_stream )
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73 {
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74 cyg_bool files_flushed[FOPEN_MAX] = { false }; // sets all to 0
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75 cyg_bool loop_again, looped = false;
115
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76 cyg_ucount32 i;
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77 Cyg_ErrNo err=ENOERR;
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78 Cyg_StdioStream *stream;
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79
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80 do {
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81 loop_again = false;
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82
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83 for (i=0; (i<FOPEN_MAX) && !err; i++) {
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84 if (files_flushed[i] == false) {
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85 // Don't let the files table change e.g. by closing the file.
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86 if ( !Cyg_libc_stdio_files::lock() ) {
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87 err = EINTR;
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88 break;
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89 }
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90 stream = Cyg_libc_stdio_files::get_file_stream(i);
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91
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92 if ((stream == NULL) || (stream == not_this_stream)) {
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93 // if it isn't a valid stream, set its entry in the
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94 // list of files flushed since we don't want to
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95 // flush it
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96 // Ditto if its the one we're meant to miss
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97
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98 files_flushed[i] = true;
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99 } // if
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100 else {
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101 // valid stream
174
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102 #ifdef CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO
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103 // only buffers which we've written to need flushing
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104 if ( !stream->flags.last_buffer_op_was_read)
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105 #endif
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106 {
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107 // we try to flush the first time through so that
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108 // everything is flushed that can be flushed.
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109 // The second time through we should just wait
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110 // in case some other lowerpri thread has locked the
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111 // stream, otherwise we will spin needlessly and
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112 // never let the lower pri thread run!
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113 if ( (looped && stream->lock_me()) ||
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114 stream->trylock_me() ) {
171
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115 err = stream->flush_output_unlocked();
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116 stream->unlock_me();
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117 files_flushed[i] = true;
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118 } // if
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119 else {
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120 loop_again = true;
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121 looped = true;
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122 }
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123 }
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124 } // else
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125 // We can unlock and relock every loop as we only care
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126 // about flushing streams that were open prior to this
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127 // call. Any new streams can be ignored.
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128 Cyg_libc_stdio_files::unlock();
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129 } // if
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130 } // for
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131 } // do
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132 while(loop_again && !err);
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133
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134 return err;
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135 } // cyg_libc_stdio_flush_all_but()
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136
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137 externC int
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871b38a618f4 * src/input/vfscanf.cxx (vfscanf): Silence warning.
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138 fflush( FILE *stream ) __THROW
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139 {
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140 Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream;
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141 Cyg_ErrNo err;
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142
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143 if (stream == NULL) { // tells us to flush ALL streams
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144 err = cyg_libc_stdio_flush_all_but(NULL);
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145 } // if
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146 else {
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147 err = real_stream->flush_output();
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148 } // else
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149
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150 if (err) {
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151 errno = err;
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152 return EOF;
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153 } // if
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154
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155 return 0;
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156
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157 } // fflush()
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158
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159 // EOF fflush.cxx