1 | /* systems.h - Most of the system dependant code and defines are here. */
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2 |
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3 | /* This file is part of GDBM, the GNU data base manager, by Philip A. Nelson.
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4 | Copyright (C) 1990, 1991, 1993 Free Software Foundation, Inc.
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5 |
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6 | GDBM is free software; you can redistribute it and/or modify
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7 | it under the terms of the GNU General Public License as published by
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8 | the Free Software Foundation; either version 2, or (at your option)
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9 | any later version.
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10 |
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11 | GDBM is distributed in the hope that it will be useful,
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | GNU General Public License for more details.
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15 |
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16 | You should have received a copy of the GNU General Public License
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17 | along with GDBM; see the file COPYING. If not, write to
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18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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19 |
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20 | You may contact the author by:
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21 | e-mail: [email protected]
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22 | us-mail: Philip A. Nelson
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23 | Computer Science Department
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24 | Western Washington University
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25 | Bellingham, WA 98226
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26 |
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27 | *************************************************************************/
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28 |
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29 |
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30 | /* Include all system headers first. */
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31 | #if HAVE_SYS_TYPES_H
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32 | #include <sys/types.h>
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33 | #endif
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34 | #include <stdio.h>
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35 | #if HAVE_SYS_FILE_H
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36 | #include <sys/file.h>
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37 | #endif
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38 | #include <sys/stat.h>
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39 | #if HAVE_STDLIB_H
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40 | #include <stdlib.h>
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41 | #endif
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42 | #if HAVE_STRING_H
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43 | #include <string.h>
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44 | #else
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45 | #include <strings.h>
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46 | #endif
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47 | #if HAVE_UNISTD_H
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48 | #include <unistd.h>
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49 | #endif
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50 | #if HAVE_FCNTL_H
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51 | #include <fcntl.h>
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52 | #endif
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53 |
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54 | #ifndef SEEK_SET
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55 | #define SEEK_SET 0
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56 | #endif
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57 |
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58 | #ifndef L_SET
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59 | #define L_SET SEEK_SET
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60 | #endif
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61 |
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62 |
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63 | #ifdef MSDOS
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64 | #define HAVE_RENAME 1
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65 | #endif
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66 |
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67 | /* Do we have flock? (BSD...) */
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68 |
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69 | #if HAVE_FLOCK
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70 |
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71 | #ifndef LOCK_SH
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72 | #define LOCK_SH 1
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73 | #endif
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74 |
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75 | #ifndef LOCK_EX
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76 | #define LOCK_EX 2
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77 | #endif
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78 |
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79 | #ifndef LOCK_NB
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80 | #define LOCK_NB 4
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81 | #endif
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82 |
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83 | #ifndef LOCK_UN
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84 | #define LOCK_UN 8
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85 | #endif
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86 |
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87 | #define UNLOCK_FILE(dbf) flock (dbf->desc, LOCK_UN)
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88 | #define READLOCK_FILE(dbf) lock_val = flock (dbf->desc, LOCK_SH + LOCK_NB)
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89 | #define WRITELOCK_FILE(dbf) lock_val = flock (dbf->desc, LOCK_EX + LOCK_NB)
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90 |
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91 | #else
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92 |
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93 | #ifdef MSDOS
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94 | #define MY_UNLOCK 0
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95 | #define MY_READLOCK 1
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96 | #define MY_WRITELOCK 2
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97 | int my_locking(int fh, int lmode, long lockoffset, long nbytes);
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98 |
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99 | #define UNLOCK_FILE(dbf) my_locking(dbf->desc,MY_UNLOCK,0,10)
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100 | #define READLOCK_FILE(dbf) lock_val=my_locking(dbf->desc,MY_READLOCK,0,10)
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101 | #define WRITELOCK_FILE(dbf) lock_val=my_locking(dbf->desc,MY_WRITELOCK,0,10)
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102 |
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103 | #else
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104 |
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105 | /* Assume it is done like System V. */
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106 |
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107 | #define UNLOCK_FILE(dbf) \
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108 | { \
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109 | struct flock flock; \
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110 | flock.l_type = F_UNLCK; \
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111 | flock.l_whence = SEEK_SET; \
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112 | flock.l_start = flock.l_len = 0L; \
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113 | fcntl (dbf->desc, F_SETLK, &flock); \
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114 | }
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115 | #define READLOCK_FILE(dbf) \
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116 | { \
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117 | struct flock flock; \
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118 | flock.l_type = F_RDLCK; \
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119 | flock.l_whence = SEEK_SET; \
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120 | flock.l_start = flock.l_len = 0L; \
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121 | lock_val = fcntl (dbf->desc, F_SETLK, &flock); \
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122 | }
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123 | #define WRITELOCK_FILE(dbf) \
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124 | { \
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125 | struct flock flock; \
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126 | flock.l_type = F_WRLCK; \
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127 | flock.l_whence = SEEK_SET; \
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128 | flock.l_start = flock.l_len = 0L; \
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129 | lock_val = fcntl (dbf->desc, F_SETLK, &flock); \
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130 | }
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131 | #endif
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132 | #endif
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133 |
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134 | /* Do we have bcopy? */
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135 | #if !HAVE_BCOPY
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136 | #if HAVE_MEMORY_H
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137 | #include <memory.h>
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138 | #endif
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139 | #define bcmp(d1, d2, n) memcmp(d1, d2, n)
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140 | #define bcopy(d1, d2, n) memcpy(d2, d1, n)
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141 | #endif
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142 |
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143 | /* Do we have fsync? */
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144 | #if !HAVE_FSYNC
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145 | #ifdef MSDOS
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146 | #define fsync(f)
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147 | #else
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148 | #define fsync(f) {sync(); sync();}
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149 | #endif
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150 | #endif
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151 |
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152 | /* Default block size. Some systems do not have blocksize in their
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153 | stat record. This code uses the BSD blocksize from stat. */
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154 |
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155 | #if HAVE_STRUCT_STAT_ST_BLKSIZE
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156 | #define STATBLKSIZE file_stat.st_blksize
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157 | #else
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158 | #define STATBLKSIZE 1024
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159 | #endif
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160 |
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161 | /* Do we have ftruncate? */
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162 | #if HAVE_FTRUNCATE
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163 | #define TRUNCATE(dbf) ftruncate (dbf->desc, 0)
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164 | #else
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165 | #define TRUNCATE(dbf) close( open (dbf->name, O_RDWR|O_TRUNC, mode));
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166 | #endif
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167 |
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168 | #ifndef STDERR_FILENO
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169 | #define STDERR_FILENO 2
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170 | #endif
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