need help in unix c programming

[mjumrani]

hey guys.
im currently trying to make a program in unix (redhat, compiling the .c file using gcc) and i need urgent urgent help.

i need to save objects of structures in a file but they dont seem to be saving properly. ive been on it for a whole day now. dunno why i cant do it.
when i try to read, it reads the first search i give it but after that i start getting garbage

here is the structure(names of variables omitted)

struct Employee_Details
{       char [20]
        long int 
        float 
        char [20]
        time_t 
}emp,temp;

the rest of the relevant code to add is here,

recv(sd,&emp,sizeof(emp),0);
fd=open("DB.txt",O_RDWR|O_CREAT,0766);
lseek(fd,0,SEEK_END);
write(fd,&emp,sizeof(emp));
send(sd,"Added",6,0);

here is the code to read the file

fd=open("DB.txt",O_RDWR|O_CREAT,0766);
recv(sd,&emp,sizeof(emp),0);
lseek(fd,0,SEEK_SET);
while(flag) /* flag=1*/
{       read(fd,&temp,sizeof(temp));
         if(temp.INT_MEMBER==emp.INT_MEMBER)
        {       flag=0;
                 send(sd,&temp,sizeof(temp),0);
                 lseek(fd,-(sizeof(temp)),SEEK_CUR);
                 temp.TimeStamp=time(NULL);
                 write(fd,&temp,sizeof(temp));
        }
}

please help me out