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1 /* VMS mapping of data and alloc arena for XEmacs.
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2 Copyright (C) 1986, 1987 Free Software Foundation, Inc.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 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 XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: Not synched with FSF. */
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22
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23 /* Written by Mukesh Prasad. */
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24
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25 #ifdef VMS
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26
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27 #include <config.h>
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28 #include "lisp.h"
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29 #include <rab.h>
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30 #include <fab.h>
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31 #include <rmsdef.h>
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32 #include <secdef.h>
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33
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34 /* RMS block size */
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35 #define BLOCKSIZE 512
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36
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37 /* Maximum number of bytes to be written in one RMS write.
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38 * Must be a multiple of BLOCKSIZE.
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39 */
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40 #define MAXWRITE (BLOCKSIZE * 30)
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41
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42 /* This funniness is to ensure that sdata occurs alphabetically BEFORE the
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43 $DATA psect and that edata occurs after ALL Emacs psects. This is
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44 because the VMS linker sorts all psects in a cluster alphabetically
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45 during the linking, unless you use the cluster_psect command. Emacs
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46 uses the cluster command to group all Emacs psects into one cluster;
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47 this keeps the dumped data separate from any loaded libraries. */
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48
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49 globaldef {"$D$ATA"} char sdata[512]; /* Start of saved data area */
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50 globaldef {"__DATA"} char edata[512]; /* End of saved data area */
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51
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52 /* Structure to write into first block of map file.
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53 */
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54
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55 struct map_data
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56 {
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57 char * sdata; /* Start of data area */
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58 char * edata; /* End of data area */
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59 int datablk; /* Block in file to map data area from/to */
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60 };
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61
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62 static void fill_fab (), fill_rab ();
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63 static int write_data ();
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64
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65 extern char *start_of_data ();
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66 extern int vms_out_initial; /* Defined in malloc.c */
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67
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68 /* Maps in the data and alloc area from the map file.
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69 */
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70
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71 int
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72 mapin_data (name)
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73 char * name;
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74 {
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75 struct FAB fab;
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76 struct RAB rab;
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77 int status, size;
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78 int inadr[2];
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79 struct map_data map_data;
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80
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81 /* Open map file. */
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82 fab = cc$rms_fab;
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83 fab.fab$b_fac = FAB$M_BIO|FAB$M_GET;
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84 fab.fab$l_fna = name;
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85 fab.fab$b_fns = strlen (name);
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86 status = sys$open (&fab);
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87 if (status != RMS$_NORMAL)
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88 {
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89 printf ("Map file not available, running bare Emacs....\n");
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90 return 0; /* Map file not available */
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91 }
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92 /* Connect the RAB block */
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93 rab = cc$rms_rab;
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94 rab.rab$l_fab = &fab;
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95 rab.rab$b_rac = RAB$C_SEQ;
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96 rab.rab$l_rop = RAB$M_BIO;
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97 status = sys$connect (&rab);
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98 if (status != RMS$_NORMAL)
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99 lib$stop (status);
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100 /* Read the header data */
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101 rab.rab$l_ubf = &map_data;
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102 rab.rab$w_usz = sizeof (map_data);
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103 rab.rab$l_bkt = 0;
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104 status = sys$read (&rab);
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105 if (status != RMS$_NORMAL)
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106 lib$stop (status);
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107 status = sys$close (&fab);
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108 if (status != RMS$_NORMAL)
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109 lib$stop (status);
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110 if (map_data.sdata != start_of_data ())
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111 {
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112 printf ("Start of data area has moved: cannot map in data.\n");
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113 return 0;
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114 }
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115 if (map_data.edata != edata)
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116 {
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117 printf ("End of data area has moved: cannot map in data.\n");
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118 return 0;
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119 }
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120 fab.fab$l_fop |= FAB$M_UFO;
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121 status = sys$open (&fab);
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122 if (status != RMS$_NORMAL)
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123 lib$stop (status);
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124 /* Map data area. */
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125 inadr[0] = map_data.sdata;
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126 inadr[1] = map_data.edata;
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127 status = sys$crmpsc (inadr, 0, 0, SEC$M_CRF | SEC$M_WRT, 0, 0, 0,
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128 fab.fab$l_stv, 0, map_data.datablk, 0, 0);
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129 if (! (status & 1))
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130 lib$stop (status);
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131 }
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132
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133 /* Writes the data and alloc area to the map file.
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134 */
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135 mapout_data (into)
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136 char * into;
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137 {
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138 struct FAB fab;
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139 struct RAB rab;
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140 int status;
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141 struct map_data map_data;
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142 int datasize, msize;
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143
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144 if (vms_out_initial)
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145 {
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146 error ("Out of initial allocation. Must rebuild emacs with more memory (VMS_ALLOCATION_SIZE).");
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147 return 0;
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148 }
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149 map_data.sdata = start_of_data ();
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150 map_data.edata = edata;
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151 datasize = map_data.edata - map_data.sdata + 1;
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152 map_data.datablk = 2 + (sizeof (map_data) + BLOCKSIZE - 1) / BLOCKSIZE;
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153 /* Create map file. */
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154 fab = cc$rms_fab;
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155 fab.fab$b_fac = FAB$M_BIO|FAB$M_PUT;
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156 fab.fab$l_fna = into;
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157 fab.fab$b_fns = strlen (into);
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158 fab.fab$l_fop = FAB$M_CBT;
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159 fab.fab$b_org = FAB$C_SEQ;
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160 fab.fab$b_rat = 0;
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161 fab.fab$b_rfm = FAB$C_VAR;
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162 fab.fab$l_alq = 1 + map_data.datablk +
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163 ((datasize + BLOCKSIZE - 1) / BLOCKSIZE);
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164 status = sys$create (&fab);
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165 if (status != RMS$_NORMAL)
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166 {
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167 error ("Could not create map file");
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168 return 0;
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169 }
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170 /* Connect the RAB block */
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171 rab = cc$rms_rab;
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172 rab.rab$l_fab = &fab;
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173 rab.rab$b_rac = RAB$C_SEQ;
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174 rab.rab$l_rop = RAB$M_BIO;
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175 status = sys$connect (&rab);
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176 if (status != RMS$_NORMAL)
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177 {
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178 error ("RMS connect to map file failed");
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179 return 0;
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180 }
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181 /* Write the header */
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182 rab.rab$l_rbf = &map_data;
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183 rab.rab$w_rsz = sizeof (map_data);
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184 status = sys$write (&rab);
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185 if (status != RMS$_NORMAL)
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186 {
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187 error ("RMS write (header) to map file failed");
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188 return 0;
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189 }
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190 if (! write_data (&rab, map_data.datablk, map_data.sdata, datasize))
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191 return 0;
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192 status = sys$close (&fab);
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193 if (status != RMS$_NORMAL)
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194 {
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195 error ("RMS close on map file failed");
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196 return 0;
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197 }
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198 return 1;
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199 }
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200
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201 static int
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202 write_data (rab, firstblock, data, length)
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203 struct RAB * rab;
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204 char * data;
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205 {
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206 int status;
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207
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208 rab->rab$l_bkt = firstblock;
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209 while (length > 0)
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210 {
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211 rab->rab$l_rbf = data;
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212 rab->rab$w_rsz = length > MAXWRITE ? MAXWRITE : length;
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213 status = sys$write (rab, 0, 0);
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214 if (status != RMS$_NORMAL)
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215 {
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216 error ("RMS write to map file failed");
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217 return 0;
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218 }
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219 data = &data[MAXWRITE];
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220 length -= MAXWRITE;
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221 rab->rab$l_bkt = 0;
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222 }
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223 return 1;
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224 } /* write_data */
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225
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226 #endif /* VMS */
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227
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