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annotate packages/io/common/current/src/io_file.c @ 1777:c16341b1bac6 default tip

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* Added execute permissions to files missed in conversion from CVS
author alexs
date Mon, 12 Oct 2009 02:26:09 +0100
parents d2c90368aeef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
66
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1 //==========================================================================
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2 //
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3 // io/common/io_file.c
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4 //
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5 // High-level file I/O support.
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6 //
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7 //==========================================================================
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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): gthomas
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44 // Contributors: gthomas
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45 // Date: 2000-01-10
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46 // Purpose:
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47 // Description:
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48 //
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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
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55 // File I/O support
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56
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57 #include <pkgconf/io.h>
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58 #include <cyg/io/file.h>
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59 #include <cyg/error/codes.h>
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60
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61 struct file fds[CYGPKG_IO_NFILE];
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62
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63 //
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64 // This function allcates a file "slot".
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65 //
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66 int
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67 falloc(struct file **fp, int *fd)
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68 {
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69 int i;
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70 struct file *f;
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71 f = &fds[0];
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72 for (i = 0; i < CYGPKG_IO_NFILE; i++, f++) {
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73 if (f->f_flag == 0) {
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74 f->f_flag = FALLOC;
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75 *fp = f;
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76 *fd = i;
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77 return 0;
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78 }
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79 }
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80 return EMFILE; // No more files
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81 }
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82
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83 //
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84 // This function is used to return a file slot.
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85 //
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86 void
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87 ffree(struct file *fp)
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88 {
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89 fp->f_flag = 0; // Mark free
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90 }
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91
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92 //
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93 // This function provides the mapping from a file descriptor (small
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94 // integer used by application code) to the corresponding file slot.
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95 cyg_bool
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96 getfp(int fd, struct file **fp)
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97 {
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98 struct file *f;
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99 if (fd >= CYGPKG_IO_NFILE)
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100 return -1;
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101 f = &fds[fd];
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102 if (f->f_flag == 0)
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103 return -1;
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104 *fp = f;
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105 return 0;
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106 }