Sweden-Number/server/snapshot.c

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/*
* Server-side snapshots
*
* Copyright (C) 1999 Alexandre Julliard
*
* FIXME: only process snapshots implemented for now
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include "winnt.h"
#include "tlhelp32.h"
#include "handle.h"
#include "process.h"
#include "thread.h"
#include "request.h"
struct snapshot
{
struct object obj; /* object header */
struct process_snapshot *process; /* processes snapshot */
int process_count; /* count of processes */
int process_pos; /* current position in proc snapshot */
};
static void snapshot_dump( struct object *obj, int verbose );
static void snapshot_destroy( struct object *obj );
static const struct object_ops snapshot_ops =
{
sizeof(struct snapshot), /* size */
snapshot_dump, /* dump */
no_add_queue, /* add_queue */
NULL, /* remove_queue */
NULL, /* signaled */
NULL, /* satisfied */
NULL, /* get_poll_events */
NULL, /* poll_event */
no_read_fd, /* get_read_fd */
no_write_fd, /* get_write_fd */
no_flush, /* flush */
no_get_file_info, /* get_file_info */
snapshot_destroy /* destroy */
};
/* create a new snapshot */
static struct snapshot *create_snapshot( int flags )
{
struct snapshot *snapshot;
if ((snapshot = alloc_object( &snapshot_ops, -1 )))
{
if (flags & TH32CS_SNAPPROCESS)
snapshot->process = process_snap( &snapshot->process_count );
else
snapshot->process_count = 0;
snapshot->process_pos = 0;
}
return snapshot;
}
/* get the next process in the snapshot */
static int snapshot_next_process( struct snapshot *snapshot, struct next_process_request *req )
{
struct process_snapshot *ptr;
if (!snapshot->process_count)
{
set_error( STATUS_INVALID_PARAMETER ); /* FIXME */
return 0;
}
if (req->reset) snapshot->process_pos = 0;
else if (snapshot->process_pos >= snapshot->process_count)
{
set_error( STATUS_NO_MORE_FILES );
return 0;
}
ptr = &snapshot->process[snapshot->process_pos++];
req->pid = ptr->process;
req->threads = ptr->threads;
req->priority = ptr->priority;
return 1;
}
static void snapshot_dump( struct object *obj, int verbose )
{
struct snapshot *snapshot = (struct snapshot *)obj;
assert( obj->ops == &snapshot_ops );
fprintf( stderr, "Snapshot: %d processes\n",
snapshot->process_count );
}
static void snapshot_destroy( struct object *obj )
{
int i;
struct snapshot *snapshot = (struct snapshot *)obj;
assert( obj->ops == &snapshot_ops );
if (snapshot->process_count)
{
for (i = 0; i < snapshot->process_count; i++)
release_object( snapshot->process[i].process );
free( snapshot->process );
}
}
/* create a snapshot */
DECL_HANDLER(create_snapshot)
{
struct snapshot *snapshot;
req->handle = -1;
if ((snapshot = create_snapshot( req->flags )))
{
req->handle = alloc_handle( current->process, snapshot, 0, req->inherit );
release_object( snapshot );
}
}
/* get the next process from a snapshot */
DECL_HANDLER(next_process)
{
struct snapshot *snapshot;
if ((snapshot = (struct snapshot *)get_handle_obj( current->process, req->handle,
0, &snapshot_ops )))
{
snapshot_next_process( snapshot, req );
release_object( snapshot );
}
}