Hello, I'm writing a plugin which extract some information first then write them back to asm file formatted as pseudo-ops. In my design the write back to asm part is in finish_unit_callback. I thought at this time output to asm_out_file should already finished and file already closed, so i used fopen ( asm_file_name, "a" ); and fprintf() to write my data. But I found: If I use fclose() after fprintf(), I got nothing in asm output; If I don't close the file I opened, I can got correct output, but if I write too much data, the first several chracters are truncated. I guess at the time finish_unit_callback execute the asm output file is still being accessed by the compiler, is it? how to append some pseudo-ops at the end of asm output file in a plugin? Thanks, Yue Liu