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1 | /* VMS mapping of data and alloc arena for GNU Emacs. |
2 | Copyright (C) 1986, 1987 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GNU Emacs. | |
5 | ||
6 | GNU Emacs is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
7c938215 | 8 | the Free Software Foundation; either version 2, or (at your option) |
d427b66a JB |
9 | any later version. |
10 | ||
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Emacs; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | /* Written by Mukesh Prasad. */ | |
21 | ||
22 | #ifdef VMS | |
23 | ||
18160b98 | 24 | #include <config.h> |
d427b66a JB |
25 | #include "lisp.h" |
26 | #include <rab.h> | |
27 | #include <fab.h> | |
28 | #include <rmsdef.h> | |
29 | #include <secdef.h> | |
30 | ||
31 | /* RMS block size */ | |
32 | #define BLOCKSIZE 512 | |
33 | ||
34 | /* Maximum number of bytes to be written in one RMS write. | |
35 | * Must be a multiple of BLOCKSIZE. | |
36 | */ | |
37 | #define MAXWRITE (BLOCKSIZE * 30) | |
38 | ||
39 | /* This funniness is to ensure that sdata occurs alphabetically BEFORE the | |
40 | $DATA psect and that edata occurs after ALL Emacs psects. This is | |
41 | because the VMS linker sorts all psects in a cluster alphabetically | |
42 | during the linking, unless you use the cluster_psect command. Emacs | |
43 | uses the cluster command to group all Emacs psects into one cluster; | |
44 | this keeps the dumped data separate from any loaded libraries. */ | |
45 | ||
46 | globaldef {"$D$ATA"} char sdata[512]; /* Start of saved data area */ | |
47 | globaldef {"__DATA"} char edata[512]; /* End of saved data area */ | |
48 | ||
49 | /* Structure to write into first block of map file. | |
50 | */ | |
51 | ||
52 | struct map_data | |
53 | { | |
54 | char * sdata; /* Start of data area */ | |
55 | char * edata; /* End of data area */ | |
56 | int datablk; /* Block in file to map data area from/to */ | |
57 | }; | |
58 | ||
59 | static void fill_fab (), fill_rab (); | |
60 | static int write_data (); | |
61 | ||
62 | extern char *start_of_data (); | |
63 | extern int vms_out_initial; /* Defined in malloc.c */ | |
64 | ||
65 | /* Maps in the data and alloc area from the map file. | |
66 | */ | |
67 | ||
68 | int | |
69 | mapin_data (name) | |
70 | char * name; | |
71 | { | |
72 | struct FAB fab; | |
73 | struct RAB rab; | |
74 | int status, size; | |
75 | int inadr[2]; | |
76 | struct map_data map_data; | |
77 | ||
78 | /* Open map file. */ | |
79 | fab = cc$rms_fab; | |
80 | fab.fab$b_fac = FAB$M_BIO|FAB$M_GET; | |
81 | fab.fab$l_fna = name; | |
82 | fab.fab$b_fns = strlen (name); | |
83 | status = sys$open (&fab); | |
84 | if (status != RMS$_NORMAL) | |
85 | { | |
86 | printf ("Map file not available, running bare Emacs....\n"); | |
87 | return 0; /* Map file not available */ | |
88 | } | |
89 | /* Connect the RAB block */ | |
90 | rab = cc$rms_rab; | |
91 | rab.rab$l_fab = &fab; | |
92 | rab.rab$b_rac = RAB$C_SEQ; | |
93 | rab.rab$l_rop = RAB$M_BIO; | |
94 | status = sys$connect (&rab); | |
95 | if (status != RMS$_NORMAL) | |
96 | lib$stop (status); | |
97 | /* Read the header data */ | |
98 | rab.rab$l_ubf = &map_data; | |
99 | rab.rab$w_usz = sizeof (map_data); | |
100 | rab.rab$l_bkt = 0; | |
101 | status = sys$read (&rab); | |
102 | if (status != RMS$_NORMAL) | |
103 | lib$stop (status); | |
104 | status = sys$close (&fab); | |
105 | if (status != RMS$_NORMAL) | |
106 | lib$stop (status); | |
107 | if (map_data.sdata != start_of_data ()) | |
108 | { | |
109 | printf ("Start of data area has moved: cannot map in data.\n"); | |
110 | return 0; | |
111 | } | |
112 | if (map_data.edata != edata) | |
113 | { | |
114 | printf ("End of data area has moved: cannot map in data.\n"); | |
115 | return 0; | |
116 | } | |
117 | fab.fab$l_fop |= FAB$M_UFO; | |
118 | status = sys$open (&fab); | |
119 | if (status != RMS$_NORMAL) | |
120 | lib$stop (status); | |
121 | /* Map data area. */ | |
122 | inadr[0] = map_data.sdata; | |
123 | inadr[1] = map_data.edata; | |
124 | status = sys$crmpsc (inadr, 0, 0, SEC$M_CRF | SEC$M_WRT, 0, 0, 0, | |
125 | fab.fab$l_stv, 0, map_data.datablk, 0, 0); | |
126 | if (! (status & 1)) | |
127 | lib$stop (status); | |
128 | } | |
129 | ||
130 | /* Writes the data and alloc area to the map file. | |
131 | */ | |
132 | mapout_data (into) | |
133 | char * into; | |
134 | { | |
135 | struct FAB fab; | |
136 | struct RAB rab; | |
137 | int status; | |
138 | struct map_data map_data; | |
139 | int datasize, msize; | |
140 | ||
141 | if (vms_out_initial) | |
142 | { | |
143 | error ("Out of initial allocation. Must rebuild emacs with more memory (VMS_ALLOCATION_SIZE)."); | |
144 | return 0; | |
145 | } | |
146 | map_data.sdata = start_of_data (); | |
147 | map_data.edata = edata; | |
148 | datasize = map_data.edata - map_data.sdata + 1; | |
149 | map_data.datablk = 2 + (sizeof (map_data) + BLOCKSIZE - 1) / BLOCKSIZE; | |
150 | /* Create map file. */ | |
151 | fab = cc$rms_fab; | |
152 | fab.fab$b_fac = FAB$M_BIO|FAB$M_PUT; | |
153 | fab.fab$l_fna = into; | |
154 | fab.fab$b_fns = strlen (into); | |
155 | fab.fab$l_fop = FAB$M_CBT; | |
156 | fab.fab$b_org = FAB$C_SEQ; | |
157 | fab.fab$b_rat = 0; | |
158 | fab.fab$b_rfm = FAB$C_VAR; | |
159 | fab.fab$l_alq = 1 + map_data.datablk + | |
160 | ((datasize + BLOCKSIZE - 1) / BLOCKSIZE); | |
161 | status = sys$create (&fab); | |
162 | if (status != RMS$_NORMAL) | |
163 | { | |
164 | error ("Could not create map file"); | |
165 | return 0; | |
166 | } | |
167 | /* Connect the RAB block */ | |
168 | rab = cc$rms_rab; | |
169 | rab.rab$l_fab = &fab; | |
170 | rab.rab$b_rac = RAB$C_SEQ; | |
171 | rab.rab$l_rop = RAB$M_BIO; | |
172 | status = sys$connect (&rab); | |
173 | if (status != RMS$_NORMAL) | |
174 | { | |
175 | error ("RMS connect to map file failed"); | |
176 | return 0; | |
177 | } | |
178 | /* Write the header */ | |
179 | rab.rab$l_rbf = &map_data; | |
180 | rab.rab$w_rsz = sizeof (map_data); | |
181 | status = sys$write (&rab); | |
182 | if (status != RMS$_NORMAL) | |
183 | { | |
184 | error ("RMS write (header) to map file failed"); | |
185 | return 0; | |
186 | } | |
187 | if (! write_data (&rab, map_data.datablk, map_data.sdata, datasize)) | |
188 | return 0; | |
189 | status = sys$close (&fab); | |
190 | if (status != RMS$_NORMAL) | |
191 | { | |
192 | error ("RMS close on map file failed"); | |
193 | return 0; | |
194 | } | |
195 | return 1; | |
196 | } | |
197 | ||
198 | static int | |
199 | write_data (rab, firstblock, data, length) | |
200 | struct RAB * rab; | |
201 | char * data; | |
202 | { | |
203 | int status; | |
204 | ||
205 | rab->rab$l_bkt = firstblock; | |
206 | while (length > 0) | |
207 | { | |
208 | rab->rab$l_rbf = data; | |
209 | rab->rab$w_rsz = length > MAXWRITE ? MAXWRITE : length; | |
210 | status = sys$write (rab, 0, 0); | |
211 | if (status != RMS$_NORMAL) | |
212 | { | |
213 | error ("RMS write to map file failed"); | |
214 | return 0; | |
215 | } | |
216 | data = &data[MAXWRITE]; | |
217 | length -= MAXWRITE; | |
218 | rab->rab$l_bkt = 0; | |
219 | } | |
220 | return 1; | |
221 | } /* write_data */ | |
222 | ||
223 | #endif /* VMS */ | |
224 |