CGI Buffering issue
- by Punit
I have a server side C based CGI code as:
cgiFormFileSize("UPDATEFILE", &size); //UPDATEFILE = file being uploaded
cgiFormFileName("UPDATEFILE", file_name, 1024);
cgiFormFileContentType("UPDATEFILE", mime_type, 1024);
buffer = malloc(sizeof(char) * size);
if (cgiFormFileOpen("UPDATEFILE", &file) != cgiFormSuccess) {
exit(1);
}
output = fopen("/tmp/cgi.tar.gz", "w+");
printf("The size of file is: %d bytes", size);
inc = size/(1024*100);
while (cgiFormFileRead(file, b, sizeof(b), &got_count) == cgiFormSuccess)
{
fwrite(b,sizeof(char),got_count,output);
i++;
if(i == inc && j<=100)
{
***inc_pb*** = j;
i = 0;
j++; // j is the progress bar increment value
}
}
cgiFormFileClose(file);
retval = system("mkdir /tmp/update-tmp;\
cd /tmp/update-tmp;\
tar -xzf ../cgi.tar.gz;\
bash -c /tmp/update-tmp/update.sh");
However, this doesn't work the way as is seen above. Instead of printing 1,2,...100 to progress_bar.txt one by one it prints at ONE GO, seems it buffers and then writes to the file.
fflush() also didn't work.
Any clue/suggestion would be really appreciated.
