Weird behavior in receive_data function

[Daniel.Li]

Dear List,

I'm trying to get diff/removed data and it's offset out. So I write a
functions in receive_data. When I run backup, I found there is a weird
behavior which I don't understand.

i = recv_token(f_in, &data) will receive (i = -1, offset2 = 0) some
where in the middle of the transfer procedure. That's to say, it's going
to transfer the first data block from sender, but I have been
transferring almost half of the file. I noticed it was 92nd block
(sum.blength = 700) .

Hope I have a clear explanation. I'm really confused now. Any advice and
suggestion is well appreciated.


Below is my code segment to generate file for test.

My Procedure (file 1 and file 2 have the same name, just binary
difference): 
Step 1: backup File 1
Step 2: backup Fil 2



-- 
Daniel Li


File 1: 
 This is the first time backup file.
> 		count = 1;
> 		nSize = 1;
> 		nBlock = 256;
> 		nInterval = 4;
> 		nAdjust = 256;
> 
> 		printf("\nstart to build origin files!\n");
> 		ch = 0;
> 		for(l = 0; l < count; l++)
> 		{
> 			memset(buffer,0, 256);
> 			sprintf(buffer,"media-test-3MB-file/origin/test/test%02d.dat",l);
> 			printf("writting %s \n",buffer);
> 			fd = open(buffer, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR);
> 			for(lll = 0; lll < nSize; lll++)
> 			{
> 				for(mmm = 0; mmm < nAdjust; mmm++)
> 				{
> 					for(nnn = 0; nnn < nBlock; nnn++)
> 					{
> 						write_fhead_char(fd, &ch, 1);
> 					}
> 					ch++;
> 				}
> 			}
> 		}
> 		printf("origin files done!\n");
> 



File 2:
 This is the second time backup. when transferring this file, I met the trouble. 
> 		printf("\nstart to build added data files!\n");
> 		ch = 0;
> 		for(l = 0; l < count; l++)
> 		{
> 			memset(buffer,0, 256);
> 			sprintf(buffer,"media-test-3MB-file/add/test/test%02d.dat",l);
> 			printf("writting %s \n",buffer);
> 			fd = open(buffer, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR);
> 			for(lll = 0; lll < nSize + 1; lll++)
> 			{
> 				for(mmm = 0; mmm < nAdjust; mmm++)
> 				{
> 					if(mmm % nInterval == 0)
> 					{
> 						for(nnn = 0; nnn < nBlock; nnn++)
> 						{
> 							write_fhead_char(fd, &ch, 1);
> 						}
> 					}
> 
> 					for(nnn = 0; nnn < nBlock; nnn++)
> 					{
> 						write_fhead_char(fd, &ch, 1);
> 					}
> 					ch++;
> 				}
> 			}
> 			close(fd);
> 		}