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/* ``Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* The Initial Developer of the Original Code is Ericsson Utvecklings AB.
* Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
* AB. All Rights Reserved.''
*
* $Id$
*/
/*
* Author: Rickard Green
*
* Description: Implementation of a driver that fakes different driver
* versions and tests driver_system_info(). This file should
* be included by an implementation that defines:
* * SYS_INFO_DRV_MAJOR_VSN
* * SYS_INFO_DRV_MINOR_VSN
* * SYS_INFO_DRV_NAME_STR
* * SYS_INFO_DRV_NAME
* * ERL_DRV_SYS_INFO_SIZE, or SYS_INFO_DRV_LAST_FIELD
* and implements:
* * static size_t sys_info_drv_max_res_len(ErlDrvSysInfo *)
* * static size_t sys_info_drv_sprintf_sys_info(ErlDrvSysInfo *,
* char *)
*
*/
#if !defined(ERL_DRV_SYS_INFO_SIZE) && defined(SYS_INFO_DRV_LAST_FIELD)
#define ERL_DRV_SYS_INFO_SIZE_FROM_LAST_FIELD(LAST_FIELD) \
(((size_t) &((ErlDrvSysInfo *) 0)->LAST_FIELD) \
+ sizeof(((ErlDrvSysInfo *) 0)->LAST_FIELD))
#define ERL_DRV_SYS_INFO_SIZE \
ERL_DRV_SYS_INFO_SIZE_FROM_LAST_FIELD(SYS_INFO_DRV_LAST_FIELD)
#endif
static ErlDrvData start(ErlDrvPort, char *);
static ErlDrvSSizeT control(ErlDrvData, unsigned int,
char *, ErlDrvSizeT, char **, ErlDrvSizeT);
static ErlDrvEntry drv_entry = {
NULL /* init */,
start,
NULL /* stop */,
NULL /* output */,
NULL /* ready_input */,
NULL /* ready_output */,
SYS_INFO_DRV_NAME_STR,
NULL /* finish */,
NULL /* handle */,
control,
NULL /* timeout */,
NULL /* outputv */,
NULL /* ready_async */,
NULL /* flush */,
NULL /* call */,
NULL /* event */,
ERL_DRV_EXTENDED_MARKER,
SYS_INFO_DRV_MAJOR_VSN,
SYS_INFO_DRV_MINOR_VSN,
ERL_DRV_FLAG_USE_PORT_LOCKING,
NULL /* handle2 */,
NULL /* process_exit */
};
DRIVER_INIT(SYS_INFO_DRV_NAME)
{
return &drv_entry;
}
static ErlDrvData
start(ErlDrvPort port, char *command)
{
return (ErlDrvData) port;
}
static ErlDrvSSizeT
control(ErlDrvData drv_data,
unsigned int command,
char *buf, ErlDrvSizeT len,
char **rbuf, ErlDrvSizeT rlen)
{
ErlDrvSSizeT res;
char *str;
size_t slen, slen2;
ErlDrvPort port = (ErlDrvPort) drv_data;
unsigned deadbeef[] = {0xdeadbeef,
0xdeadbeef,
0xdeadbeef,
0xdeadbeef,
0xdeadbeef,
0xdeadbeef,
0xdeadbeef,
0xdeadbeef,
0xdeadbeef,
0xdeadbeef};
ErlDrvSysInfo *sip = driver_alloc(ERL_DRV_SYS_INFO_SIZE + sizeof(deadbeef));
char *beyond_end_format = "error: driver_system_info() wrote beyond end "
"of the ErlDrvSysInfo struct";
char *buf_overflow_format = "error: Internal buffer overflow";
if (!sip) {
driver_failure_atom(port, "enomem");
return 0;
}
memset((char *) sip, 0xed, ERL_DRV_SYS_INFO_SIZE);
memcpy(((char *) sip) + ERL_DRV_SYS_INFO_SIZE,
(char *) &deadbeef[0],
sizeof(deadbeef));
driver_system_info(sip, ERL_DRV_SYS_INFO_SIZE);
slen = sys_info_drv_max_res_len(sip);
slen2 = strlen(beyond_end_format) + 1;
if (slen2 > slen)
slen = slen2;
slen2 = strlen(buf_overflow_format) + 1;
if (slen2 > slen)
slen = slen2;
str = driver_alloc(slen);
if (!str) {
driver_free(sip);
driver_failure_atom(port, "enomem");
return 0;
}
*rbuf = str;
/* Check that the emulator didn't write beyond ERL_DRV_SYS_INFO_SIZE */
if (memcmp(((char *) sip) + ERL_DRV_SYS_INFO_SIZE,
(char *) &deadbeef[0],
sizeof(deadbeef)) != 0) {
res = sprintf(str, beyond_end_format);
}
else {
res = sys_info_drv_sprintf_sys_info(sip, str);
if (res > slen)
res = sprintf(str, buf_overflow_format);
}
driver_free(sip);
return res;
}
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