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);
> }
--
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