Guess what ! (I'll say a bit more later...) [revol@patrick /boot/home/devel/mmap]$ uname -a BeOS patrick 5.0.4 1000009 BePC unknown [revol@patrick /boot/home/devel/mmap]$ ./mmtest open(/boot/home/truc, O_RDONLY)) before copying from mmap() : xxxxxxxx after copying from mmap() : totoxxxx