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/* Copyright (C) 2003 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include <ndb_global.h>
#include "SHM_Transporter.hpp"
#include "TransporterInternalDefinitions.hpp"
#include <TransporterCallback.hpp>
#include <NdbSleep.h>
#include <NdbOut.hpp>
#include <sys/ipc.h>
#include <sys/shm.h>
void SHM_Transporter::make_error_info(char info[], int sz)
{
snprintf(info,sz,"Shm key=%d sz=%d id=%d",
shmKey, shmSize, shmId);
}
bool
SHM_Transporter::ndb_shm_create()
{
shmId = shmget(shmKey, shmSize, IPC_CREAT | 960);
if(shmId == -1) {
perror("shmget: ");
return false;
}
return true;
}
bool
SHM_Transporter::ndb_shm_get()
{
shmId = shmget(shmKey, shmSize, 0);
if(shmId == -1) {
perror("shmget: ");
return false;
}
return true;
}
bool
SHM_Transporter::ndb_shm_attach()
{
shmBuf = (char *)shmat(shmId, 0, 0);
if(shmBuf == 0) {
perror("shmat: ");
return false;
}
return true;
}
bool
SHM_Transporter::checkConnected(){
struct shmid_ds info;
const int res = shmctl(shmId, IPC_STAT, &info);
if(res == -1){
char buf[128];
int r= snprintf(buf, sizeof(buf),
"shmctl(%d, IPC_STAT) errno: %d(%s). ", shmId,
errno, strerror(errno));
make_error_info(buf+r, sizeof(buf)-r);
DBUG_PRINT("error",(buf));
switch (errno)
{
case EACCES:
report_error(TE_SHM_IPC_PERMANENT, buf);
break;
default:
report_error(TE_SHM_IPC_STAT, buf);
break;
}
return false;
}
if(info.shm_nattch != 2){
char buf[128];
make_error_info(buf, sizeof(buf));
report_error(TE_SHM_DISCONNECT);
DBUG_PRINT("error", ("Already connected to node %d",
remoteNodeId));
return false;
}
return true;
}
void
SHM_Transporter::disconnectImpl(){
if(_attached){
const int res = shmdt(shmBuf);
if(res == -1){
perror("shmdelete: ");
return;
}
_attached = false;
if(!isServer && _shmSegCreated)
_shmSegCreated = false;
}
if(isServer && _shmSegCreated){
const int res = shmctl(shmId, IPC_RMID, 0);
if(res == -1){
char buf[64];
make_error_info(buf, sizeof(buf));
report_error(TE_SHM_UNABLE_TO_REMOVE_SEGMENT);
return;
}
_shmSegCreated = false;
}
setupBuffersDone=false;
}
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