Perform other functions while untarring file using "system" command in a C program

[zoqix]

Hi all, 
I'm using the "system" command to do an untarring of a file.tar.gz file in my C program. However, I would like to display some status information like "10 % Completed". I've written some code to calculate the percentage. However, the code could only be runned after the "system" command finished untarring my zipped file. e.g. 

system("tar zxf file.tar.gz");
do
{
printf("%d %% Completed", percent);
}while (!finished) 

Therefore, the printf will always print 100 % Completed. Is there any way to let the unzipping continue at background and return to print the completion status? 

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