我有这段代码，我在读取系统调用时遇到了 BAD FILE DESCRIPTOR 问题。但是，我使用相同文件描述符的写调用工作正常。请建议
void Update_Log( )
{
struct logDetails update,update1[30];
struct stat fileData,fileData1;
int file;
int index;
//pthread_t pid;
char writeBuffer[MAX_BUFFER_SIZE];
char readBuffer[MAX_BUFFER_SIZE];
char mBuf[MAX_BUFFER_SIZE],mBuf1[MAX_BUFFER_SIZE];
if((access("/home/team02/DMS/Server/",F_OK))==0) //checking the file/dir existence
puts("file found");
else
puts("file not found");
if((file=open("/home/team02/DMS/Server/filename.txt",O_RDONLY|O_WRONLY|O_APPEND,S_IRWXU))==-1)
perror("file not opened");
if((fstat(file, &fileData))==-1)
perror("structure not filled");
if((stat("/home/team02/DMS/Server/f1",&fileData1))==-1)
perror("structure not filled");
//printf("%d/n",fileData.st_mtime);
//printf("%d",fileData.st_ctime);
struct tm *mytm = localtime(&fileData.st_mtime);
struct tm *mytime=localtime(&fileData1.st_mtime);
strftime(mBuf1,18,"%I:%M:%S-%m%d%y",mytime);
strftime(mBuf, 18, "%I:%M:%S-%m/%d/%y", mytm);
puts(mBuf);
if((strcmp(mBuf,mBuf1)==0))
puts("equal");
else
puts("not equal");
strcpy(update.timestamp,mBuf);
strcpy(update.clientName,mBuf);
strcpy(update.filename,mBuf1);
snprintf(writeBuffer,MAX_BUFFER_SIZE,"%s %s %s",update.clientName,update.filename,update.timestamp);
//printf("%s",writeBuffer);
//if((pthread_create(&pid,&thread_handler,NULL))!=0)
//perror("Thread not created");
if((write(file,writeBuffer,strlen(writeBuffer)))==-1)
perror("write unsuccessful");
**if((read(file,readBuffer,MAX_BUFFER_SIZE))==-1)
perror("read unsuccessful");**
for(index=0;index<strlen(readBuffer);index++)
{
sscanf(readBuffer,"%s %s %s",update1[index].clientName,update1[index].filename,update1[index].timestamp);
printf("%s",update1[index].clientName);
}
close(file);
}