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dbUpdate.c
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dbUpdate.c
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#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/sem.h>
#include <time.h>
#include <sys/time.h>
#include <stdio.h>
#include <string.h>
#include <pthread.h>
#include <errno.h>
#include "dbUpdate.h"
#include "venusdb.h"
static char *share_region=NULL;
static int share_id=-1;
const int num_sems = 1; /* number of semaphores in set */
static int sem_send, sem_recv; /* semaphore */
pthread_t update_thread;
#ifndef semun
union semun {
int val; /* Value for SETVAL */
struct semid_ds *buf; /* Buffer for IPC_STAT, IPC_SET */
unsigned short *array; /* Array for GETALL, SETALL */
struct seminfo *__buf; /* Buffer for IPC_INFO (Linux specific) */
};
#endif
static void Logging(const char *filePath, const char *logString);
static void ProcessUpdate(void *buffer);
static int InitSem(void); /* initial semaphore */
static int semaphore_p(int sem_id); /* P() */
static int semaphore_v(int sem_id); /* V() */
static int semaphore_p(int sem_id)
{
struct sembuf sem_b;
sem_b.sem_num = 0;
sem_b.sem_op = -1; /* P() */
sem_b.sem_flg = SEM_UNDO;
if (semop(sem_id, &sem_b, 1) == -1)
return -1;
return 0;
}
static int semaphore_v(int sem_id)
{
struct sembuf sem_b;
sem_b.sem_num = 0;
sem_b.sem_op = +1; /* V() */
sem_b.sem_flg = SEM_UNDO;
if (semop(sem_id, &sem_b, 1) == -1)
return -1;
return 0;
}
static int InitSem(void)
{
union semun sem_union;
key_t sem_key1, sem_key2;
char logString[256];
sem_key1 = ftok(KEY_PATH, SEM_SEND_KEY);
sem_key2 = ftok(KEY_PATH, SEM_RECV_KEY);
if ((sem_key1 == -1)||(sem_key2 == -1))
{
memset(logString, 0, 256);
snprintf(logString,256,"[ERROR] domainUpdate.c @ InitSem @ ftok --- %s", strerror(errno));
goto err_out;
}
sem_send = semget(sem_key1, num_sems, IPC_CREAT|IPC_EXCL|0660);
if(sem_send != -1)
{
sem_union.val = 1;
if (semctl(sem_send, 0, SETVAL, sem_union) == -1)
{
memset(logString, 0, 256);
snprintf(logString,256,"[ERROR] domainUpdate.c @ InitSem @ semctl --- %s", strerror(errno));
goto err_out;
}
}else{
sem_send = semget(sem_key1, num_sems, 0);
if(sem_send == -1)
{
memset(logString, 0, 256);
snprintf(logString,256,"[ERROR] domainUpdate.c @ InitSem @ semget --- %s", strerror(errno));
goto err_out;
}
}
sem_recv = semget(sem_key2, num_sems, IPC_CREAT|IPC_EXCL|0660);
if (sem_recv != -1)
{
sem_union.val = 0;
if (semctl(sem_recv, 0, SETVAL, sem_union) == -1)
{
memset(logString, 0, 256);
snprintf(logString,256,"[ERROR] domainUpdate.c @ InitSem @ semctl --- %s", strerror(errno));
goto err_out;
}
}else{
sem_recv = semget(sem_key2, num_sems, 0);
if(sem_send == -1)
{
memset(logString, 0, 256);
snprintf(logString,256,"[ERROR] shareMem.c @ InitSem @ semget --- %s", strerror(errno));
goto err_out;
}
}
return 0;
err_out:
Logging(PROG_ERROR_LOG, logString);
return -1;
}
void* UpdateCreate(void *arg)
{
//receive data from shared memory.
char logString[256];
int oldtype, ret, retry=0;
pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS,&oldtype);
while(1)
{
ret = semaphore_p(sem_recv);
if(ret == -1)
{
memset(logString, 0, 256);
if(retry < 3)
{
InitShm(); // 尝试重新创建信号量及共享内存
retry++;
continue;
}else{
snprintf(logString,256,"[ERROR] domainUpdate.c @ UpdateCreate @ semaphore_p --- semaphore maybe destory, resume failed!");
Logging(PROG_ERROR_LOG, logString);
return (void*)(-1);
}
}
retry = 0;
ProcessUpdate(share_region);
ret = semaphore_v(sem_send);
if(ret == -1)
{
InitShm(); // 尝试重新创建信号量及共享内存
retry++;
}
}
return arg;
}
static void ProcessUpdate(void *buffer)
{
struct record_set_hdr *recdhdr;
int sum=0;
struct timeval t1,t2;
struct timezone tz;
unsigned long update_t, flush_t;
char logString[256];
recdhdr=(struct record_set_hdr *)buffer;
if(recdhdr->data_type==DATA_TYPE_DOMAIN)
{
gettimeofday (&t1,&tz);
sum=UpdateDomainName(buffer+sizeof(*recdhdr), recdhdr->recd_size,recdhdr->update_type);
gettimeofday (&t2,&tz);
update_t = (t2.tv_sec-t1.tv_sec)*1000000+(t2.tv_usec-t1.tv_usec);
if(sum == 0)
{
snprintf(logString,256,"Type: DOMAIN. <<FAILED>> Update-Type: QUICK\n\
Time-Valid: %lu us Time-Total: %lu us\n", update_t, update_t);
goto out;
}
//write data to file;
SaveToFile(buffer+sizeof(*recdhdr),recdhdr->recd_size);
if(recdhdr->update_type==UPDATE_QUICK)
{
gettimeofday (&t1,&tz);
AddListToBTree();
gettimeofday (&t2,&tz);
flush_t = (t2.tv_sec-t1.tv_sec)*1000000+(t2.tv_usec-t1.tv_usec);
memset(logString, 0, 256);
snprintf(logString,256,"Type: DOMAIN. Counts: %u. Update-Type: QUICK\n\
Time-Valid: %lu us Time-Total: %lu us\n", sum, update_t, update_t+flush_t);
goto out;
}else{
memset(logString, 0, 256);
snprintf(logString,256,"Type: DOMAIN. Counts: %u. Update-Type: NORMAL\n \
Time-Valid: %lu us Time-Total: %lu us\n", sum, update_t, update_t);
goto out;
}
}
out:
Logging(PROG_UPDATE_LOG, logString);
}
result_t InitShm(void)
{
key_t mem_key;
char logString[256];
mem_key = ftok(KEY_PATH, SHARE_MEM_KEY);
if(mem_key==-1)
{
memset(logString, 0, 256);
snprintf(logString,256,"[ERROR] domainUpdate.c @ InitShm @ ftok --- %s", strerror(errno));
goto err_out;
}
share_id=shmget(mem_key,SHARE_SIZE,IPC_CREAT|0660);
if(share_id==-1)
{
memset(logString, 0, 256);
snprintf(logString,256,"[ERROR] domainUpdate.c @ InitShm @ shmget --- %s", strerror(errno));
goto err_out;
}
if((share_region=shmat(share_id, 0, 0))==(void *)(-1))
{
memset(logString, 0, 256);
snprintf(logString,256,"[ERROR] domainUpdate.c @ InitShm @ shmat --- %s", strerror(errno));
goto err_out;
}
// 初始化信号量
if(InitSem() == -1)
return -1;
return R_SUCCESS;
err_out:
Logging(PROG_ERROR_LOG, logString);
return R_FAILED;
}
result_t DetShm(void)
{
// detach from share memory.
if(share_region!=NULL)
shmdt(share_region);
return R_SUCCESS;
}
static void
Logging(const char *filePath, const char *logString )
{
char timeLog[32];
FILE *LogFile;
time_t now = time(NULL);
strftime(timeLog,sizeof(timeLog),"%d/%b/%Y:%H:%M:%S %Z",localtime(&now));
if((LogFile = fopen(filePath,"a+")) == NULL) { perror("fopen"); return; }
fprintf(LogFile,"[%s] ",timeLog);
fprintf(LogFile,"%s\n",logString);
fclose(LogFile);
}