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swap.c
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C/C++ Source or Header
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1991-10-31
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7KB
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262 lines
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#ifdef __STDC__
#include <memory.h>
#endif
#include "lint.h"
#include "interpret.h"
#include "object.h"
#include "config.h"
#include "exec.h"
/*
* Swap out programs from objects.
*/
int num_swapped;
int total_bytes_swapped;
char file_name[100];
FILE *swap_file; /* The swap file is opened once */
int total_num_prog_blocks, total_prog_block_size;
extern int d_flag;
/*
* marion - adjust pointers for swap out and later relocate on swap in
* program
* line_numbers
* functions
* strings
* variable_names
* inherit
* argument_types
* type_start
*/
int
locate_out (prog) struct program *prog; {
char *p = 0; /* keep cc happy */
if (!prog) return 0;
if (d_flag > 1) {
debug_message ("locate_out: %lX %lX %lX %lX %lX %lX %lX %lX\n",
prog->program, prog->line_numbers, prog->functions,
prog->strings, prog->variable_names, prog->inherit,
prog->argument_types, prog->type_start);
}
prog->program = &p[prog->program - (char *)prog];
prog->line_numbers = (unsigned short *)
&p[(char *)prog->line_numbers - (char *)prog];
prog->functions = (struct function *)
&p[(char *)prog->functions - (char *)prog];
prog->strings = (char **)
&p[(char *)prog->strings - (char *)prog];
prog->variable_names= (struct variable *)
&p[(char *)prog->variable_names - (char *)prog];
prog->inherit = (struct inherit *)
&p[(char *)prog->inherit - (char *)prog];
if (prog->type_start) {
prog->argument_types = (unsigned short *)
&p[(char *)prog->argument_types - (char *)prog];
prog->type_start = (unsigned short *)
&p[(char *)prog->type_start - (char *)prog];
}
return 1;
}
/*
* marion - relocate pointers after swap in
* program
* line_numbers
* functions
* strings
* variable_names
* inherit
* argument_types
* type_start
*/
int
locate_in (prog) struct program *prog; {
char *p = (char *)prog;
if (!prog) return 0;
prog->program = &p[prog->program - (char *)0];
prog->line_numbers = (unsigned short *)
&p[(char *)prog->line_numbers - (char *)0];
prog->functions = (struct function *)
&p[(char *)prog->functions - (char *)0];
prog->strings = (char **)
&p[(char *)prog->strings - (char *)0];
prog->variable_names= (struct variable *)
&p[(char *)prog->variable_names - (char *)0];
prog->inherit = (struct inherit *)
&p[(char *)prog->inherit - (char *)0];
if (prog->type_start) {
prog->argument_types = (unsigned short *)
&p[(char *)prog->argument_types - (char *)0];
prog->type_start = (unsigned short *)
&p[(char *)prog->type_start - (char *)0];
}
if (d_flag > 1) {
debug_message ("locate_in: %lX %lX %lX %lX %lX %lX %lX\n",
prog->program, prog->line_numbers, prog->functions,
prog->strings, prog->variable_names, prog->inherit,
prog->argument_types, prog->type_start);
}
return 1;
}
/*
* Swap out an object. Only the program is swapped, not the 'struct object'.
*
* marion - the swap seems to corrupt the function table
*/
int swap(ob)
struct object *ob;
{
if (ob->flags & O_DESTRUCTED)
return 0;
if (d_flag > 1) { /* marion */
debug_message("Swap object %s (ref %d)\n", ob->name, ob->ref);
}
if (swap_file == 0) {
#ifndef MSDOS
char host[50];
gethostname(host, sizeof host);
sprintf(file_name, "%s.%s", SWAP_FILE, host);
swap_file = fopen(file_name, "w+");
#else
swap_file = fopen(strcpy(file_name,"LPMUD.SWAP"),"w+b");
#endif
/* Leave this file pointer open ! */
if (swap_file == 0)
return 0;
}
if (!ob->prog)
{
fprintf(stderr, "warning:no program in object %s, don't swap it\n",
ob->name);
/* It's no good freeing a NULL pointer */
return 0;
}
if ((ob->flags & O_HEART_BEAT) || (ob->flags & O_CLONE)) {
if (d_flag > 1) {
debug_message (" object not swapped - heart beat or cloned.\n");
}
return 0;
}
if (ob->prog->ref > 1 || ob->interactive) {
if (d_flag > 1) {
debug_message (" object not swapped - inherited or interactive.\n");
}
return 0;
}
/*
* Has this object already been swapped, and read in again ?
* Then it is very easy to swap it out again.
*/
if (ob->swap_num >= 0) {
total_bytes_swapped += ob->prog->total_size;
free_prog(ob->prog, 0); /* Do not free the strings */
ob->prog = 0;
ob->flags |= O_SWAPPED;
num_swapped++;
return 1;
}
/*
* marion - it is more efficient to write one item the size of the
* program to the file than many items of size one. besides, it's
* much more reasonable, as the fwrite only fails for the whole
* block and not for a part of it.
*/
ob->swap_num = ftell(swap_file);
locate_out (ob->prog); /* relocate the internal pointers */
if (fwrite((char *)ob->prog, ob->prog->total_size, 1, swap_file) != 1) {
debug_message("I/O error in swap.\n");
ob->swap_num = -1;
return 0;
}
total_bytes_swapped += ob->prog->total_size;
num_swapped++;
free_prog(ob->prog, 0); /* Don't free the shared strings */
ob->prog = 0;
ob->flags |= O_SWAPPED;
return 1;
}
void load_ob_from_swap(ob)
struct object *ob;
{
extern int errno;
struct program tmp_prog;
if (ob->swap_num == -1)
fatal("Loading not swapped object.\n");
if (fseek(swap_file, ob->swap_num, 0) == -1)
fatal("Couldn't seek the swap file, errno %d, offset %d.\n",
errno, ob->swap_num);
if (d_flag > 1) { /* marion */
debug_message("Unswap object %s (ref %d)\n", ob->name, ob->ref);
}
/*
* The size of the program is unkown, so read first part to
* find out.
*
* marion - again, the read in a block is more efficient
*/
if (fread((char *)&tmp_prog, sizeof tmp_prog, 1, swap_file) != 1) {
fatal("Couldn't read the swap file.\n");
}
ob->prog = (struct program *)xalloc(tmp_prog.total_size);
memcpy((char *)ob->prog, (char *)&tmp_prog, sizeof tmp_prog);
fread((char *)ob->prog + sizeof tmp_prog,
tmp_prog.total_size - sizeof tmp_prog, 1, swap_file);
/*
* to be relocated:
* program
* line_numbers
* functions
* strings
* variable_names
* inherit
* argument_types
* type_start
*/
locate_in (ob->prog); /* relocate the internal pointers */
/* The reference count will already be 1 ! */
ob->flags &= ~O_SWAPPED;
total_bytes_swapped -= ob->prog->total_size;
num_swapped--;
total_prog_block_size += ob->prog->total_size;
total_num_prog_blocks += 1;
if (fseek(swap_file, 0L, 2) == -1) { /* marion - seek back for more swap */
fatal("Couldn't seek end the swap file, errno %d.\n", errno);
}
}
void remove_swap_file(ob)
struct object *ob;
{
/* Haven't implemented this yet :-( */
}
/*
* This one is called at shutdown. Remove the swap file.
*/
void unlink_swap_file() {
if (swap_file == 0)
return;
#ifndef MSDOS
unlink(file_name);
fclose(swap_file);
#else
fclose(swap_file);
unlink(file_name);
#endif
}