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//======================================================================== // // fflush.cxx // // Implementation of C library file flush function as per ANSI 7.9.5.2 // //======================================================================== //####ECOSGPLCOPYRIGHTBEGIN#### // ------------------------------------------- // This file is part of eCos, the Embedded Configurable Operating System. // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc. // // eCos is free software; you can redistribute it and/or modify it under // the terms of the GNU General Public License as published by the Free // Software Foundation; either version 2 or (at your option) any later version. // // eCos is distributed in the hope that it will be useful, but WITHOUT ANY // WARRANTY; without even the implied warranty of MERCHANTABILITY or // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License // for more details. // // You should have received a copy of the GNU General Public License along // with eCos; if not, write to the Free Software Foundation, Inc., // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. // // As a special exception, if other files instantiate templates or use macros // or inline functions from this file, or you compile this file and link it // with other works to produce a work based on this file, this file does not // by itself cause the resulting work to be covered by the GNU General Public // License. However the source code for this file must still be made available // in accordance with section (3) of the GNU General Public License. // // This exception does not invalidate any other reasons why a work based on // this file might be covered by the GNU General Public License. // // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. // at http://sources.redhat.com/ecos/ecos-license/ // ------------------------------------------- //####ECOSGPLCOPYRIGHTEND#### //======================================================================== //#####DESCRIPTIONBEGIN#### // // Author(s): jlarmour // Contributors: // Date: 2000-04-20 // Purpose: Provides ISO C fflush() function // Description: // Usage: // //####DESCRIPTIONEND#### // //======================================================================== // CONFIGURATION #include <pkgconf/libc_stdio.h> // Configuration header // INCLUDES #include <cyg/infra/cyg_type.h> // Common project-wide type definitions #include <stddef.h> // NULL and size_t from compiler #include <errno.h> // Error codes #include <stdio.h> // header for fflush() #include <cyg/libc/stdio/stream.hxx>// C library streams #include <cyg/libc/stdio/stdiofiles.hxx> // C library files #include <cyg/libc/stdio/stdiosupp.hxx> // support for stdio // FUNCTIONS // flush all but one stream externC Cyg_ErrNo cyg_libc_stdio_flush_all_but( Cyg_StdioStream *not_this_stream ) { cyg_bool files_flushed[FOPEN_MAX] = { false }; // sets all to 0 cyg_bool loop_again, looped = false; cyg_ucount32 i; Cyg_ErrNo err=ENOERR; Cyg_StdioStream *stream; do { loop_again = false; for (i=0; (i<FOPEN_MAX) && !err; i++) { if (files_flushed[i] == false) { stream = Cyg_libc_stdio_files::get_file_stream(i); if ((stream == NULL) || (stream == not_this_stream)) { // if it isn't a valid stream, set its entry in the // list of files flushed since we don't want to // flush it // Ditto if its the one we're meant to miss files_flushed[i] = true; } // if else { // valid stream #ifdef CYGSEM_LIBC_STDIO_WANT_BUFFERED_IO // only buffers which we've written to need flushing if ( !stream->flags.last_buffer_op_was_read) #endif { // we try to flush the first time through so that // everything is flushed that can be flushed. // The second time through we should just wait // in case some other lowerpri thread has locked the // stream, otherwise we will spin needlessly and // never let the lower pri thread run! if ( (looped && stream->lock_me()) || stream->trylock_me() ) { err = stream->flush_output_unlocked(); stream->unlock_me(); files_flushed[i] = true; } // if else { loop_again = true; looped = true; } } } // else } // if } // for } // do while(loop_again && !err); return err; } // cyg_libc_stdio_flush_all_but() externC int fflush( FILE *stream ) { Cyg_StdioStream *real_stream = (Cyg_StdioStream *)stream; Cyg_ErrNo err; if (stream == NULL) { // tells us to flush ALL streams err = cyg_libc_stdio_flush_all_but(NULL); } // if else { err = real_stream->flush_output(); } // else if (err) { errno = err; return EOF; } // if return 0; } // fflush() // EOF fflush.cxx