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annotate packages/io/common/current/src/io_file.c @ 66:bf00f99aec69 ecos-sw-2000-02-02

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Merge from eCos master repository on 2000-02-02-19:16:44-GMT
author jlarmour
date Wed, 02 Feb 2000 19:57:02 +0000
parents
children da3908c9cd10
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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 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): gthomas
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35 // Contributors: gthomas
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36 // Date: 2000-01-10
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37 // Purpose:
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38 // Description:
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39 //
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40 //
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41 //####DESCRIPTIONEND####
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42 //
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43 //==========================================================================
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44
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45
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46 // File I/O support
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47
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48 #include <pkgconf/io.h>
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49 #include <cyg/io/file.h>
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50 #include <sys/errno.h>
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51
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52 struct file fds[CYGPKG_IO_NFILE];
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53
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54 //
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55 // This function allcates a file "slot".
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56 //
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57 int
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58 falloc(struct file **fp, int *fd)
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59 {
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60 int i;
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61 struct file *f;
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62 f = &fds[0];
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63 for (i = 0; i < CYGPKG_IO_NFILE; i++, f++) {
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64 if (f->f_flag == 0) {
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65 f->f_flag = FALLOC;
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66 *fp = f;
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67 *fd = i;
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68 return 0;
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69 }
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70 }
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71 return -EMFILE; // No more files
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72 }
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73
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74 //
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75 // This function is used to return a file slot.
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76 //
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77 void
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78 ffree(struct file *fp)
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79 {
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80 fp->f_flag = 0; // Mark free
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81 }
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82
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83 //
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84 // This function provides the mapping from a file descriptor (small
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85 // integer used by application code) to the corresponding file slot.
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86 cyg_bool
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87 getfp(int fd, struct file **fp)
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88 {
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89 struct file *f;
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90 if (fd >= CYGPKG_IO_NFILE)
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91 return -1;
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92 f = &fds[fd];
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93 if (f->f_flag == 0)
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94 return -1;
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95 *fp = f;
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96 return 0;
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97 }
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98