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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [io/] [common/] [v2_0/] [src/] [io_file.c] - Rev 596
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//========================================================================== // // io/common/io_file.c // // High-level file I/O support. // //========================================================================== //####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): gthomas // Contributors: gthomas // Date: 2000-01-10 // Purpose: // Description: // // //####DESCRIPTIONEND#### // //========================================================================== // File I/O support #include <pkgconf/io.h> #include <cyg/io/file.h> #include <cyg/error/codes.h> struct file fds[CYGPKG_IO_NFILE]; // // This function allcates a file "slot". // int falloc(struct file **fp, int *fd) { int i; struct file *f; f = &fds[0]; for (i = 0; i < CYGPKG_IO_NFILE; i++, f++) { if (f->f_flag == 0) { f->f_flag = FALLOC; *fp = f; *fd = i; return 0; } } return EMFILE; // No more files } // // This function is used to return a file slot. // void ffree(struct file *fp) { fp->f_flag = 0; // Mark free } // // This function provides the mapping from a file descriptor (small // integer used by application code) to the corresponding file slot. cyg_bool getfp(int fd, struct file **fp) { struct file *f; if (fd >= CYGPKG_IO_NFILE) return -1; f = &fds[fd]; if (f->f_flag == 0) return -1; *fp = f; return 0; }
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