//==========================================================================
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//==========================================================================
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//
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//
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// io/common/io_file.c
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// io/common/io_file.c
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//
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//
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// High-level file I/O support.
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// High-level file I/O support.
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//
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//
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//==========================================================================
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//==========================================================================
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//####ECOSGPLCOPYRIGHTBEGIN####
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//####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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//
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later version.
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// Software Foundation; either version 2 or (at your option) any later version.
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//
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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// for more details.
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//
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//
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// You should have received a copy of the GNU General Public License along
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// You should have received a copy of the GNU General Public License along
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// with eCos; if not, write to the Free Software Foundation, Inc.,
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// with eCos; if not, write to the Free Software Foundation, Inc.,
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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//
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//
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// As a special exception, if other files instantiate templates or use macros
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// As a special exception, if other files instantiate templates or use macros
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// or inline functions from this file, or you compile this file and link it
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// or inline functions from this file, or you compile this file and link it
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// with other works to produce a work based on this file, this file does not
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// with other works to produce a work based on this file, this file does not
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// by itself cause the resulting work to be covered by the GNU General Public
|
// by itself cause the resulting work to be covered by the GNU General Public
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// License. However the source code for this file must still be made available
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// License. However the source code for this file must still be made available
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// in accordance with section (3) of the GNU General Public License.
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// in accordance with section (3) of the GNU General Public License.
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//
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//
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// This exception does not invalidate any other reasons why a work based on
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// This exception does not invalidate any other reasons why a work based on
|
// this file might be covered by the GNU General Public License.
|
// this file might be covered by the GNU General Public License.
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//
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//
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// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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// at http://sources.redhat.com/ecos/ecos-license/
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// at http://sources.redhat.com/ecos/ecos-license/
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// -------------------------------------------
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// -------------------------------------------
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//####ECOSGPLCOPYRIGHTEND####
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//####ECOSGPLCOPYRIGHTEND####
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//==========================================================================
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//==========================================================================
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//#####DESCRIPTIONBEGIN####
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//#####DESCRIPTIONBEGIN####
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//
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//
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// Author(s): gthomas
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// Author(s): gthomas
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// Contributors: gthomas
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// Contributors: gthomas
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// Date: 2000-01-10
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// Date: 2000-01-10
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// Purpose:
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// Purpose:
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// Description:
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// Description:
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//
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//
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//
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//
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//####DESCRIPTIONEND####
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//####DESCRIPTIONEND####
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//
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//
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//==========================================================================
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//==========================================================================
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|
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// File I/O support
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// File I/O support
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#include <pkgconf/io.h>
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#include <pkgconf/io.h>
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#include <cyg/io/file.h>
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#include <cyg/io/file.h>
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#include <cyg/error/codes.h>
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#include <cyg/error/codes.h>
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struct file fds[CYGPKG_IO_NFILE];
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struct file fds[CYGPKG_IO_NFILE];
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|
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//
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//
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// This function allcates a file "slot".
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// This function allcates a file "slot".
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//
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//
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int
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int
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falloc(struct file **fp, int *fd)
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falloc(struct file **fp, int *fd)
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{
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{
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int i;
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int i;
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struct file *f;
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struct file *f;
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f = &fds[0];
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f = &fds[0];
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for (i = 0; i < CYGPKG_IO_NFILE; i++, f++) {
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for (i = 0; i < CYGPKG_IO_NFILE; i++, f++) {
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if (f->f_flag == 0) {
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if (f->f_flag == 0) {
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f->f_flag = FALLOC;
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f->f_flag = FALLOC;
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*fp = f;
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*fp = f;
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*fd = i;
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*fd = i;
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return 0;
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return 0;
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}
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}
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}
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}
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return EMFILE; // No more files
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return EMFILE; // No more files
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}
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}
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|
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//
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//
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// This function is used to return a file slot.
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// This function is used to return a file slot.
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//
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//
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void
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void
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ffree(struct file *fp)
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ffree(struct file *fp)
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{
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{
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fp->f_flag = 0; // Mark free
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fp->f_flag = 0; // Mark free
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}
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}
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|
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//
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//
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// This function provides the mapping from a file descriptor (small
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// This function provides the mapping from a file descriptor (small
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// integer used by application code) to the corresponding file slot.
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// integer used by application code) to the corresponding file slot.
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cyg_bool
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cyg_bool
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getfp(int fd, struct file **fp)
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getfp(int fd, struct file **fp)
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{
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{
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struct file *f;
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struct file *f;
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if (fd >= CYGPKG_IO_NFILE)
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if (fd >= CYGPKG_IO_NFILE)
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return -1;
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return -1;
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f = &fds[fd];
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f = &fds[fd];
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if (f->f_flag == 0)
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if (f->f_flag == 0)
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return -1;
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return -1;
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*fp = f;
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*fp = f;
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return 0;
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return 0;
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}
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}
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