$ strace -o log2.txt ./test2.exe /dev/ttyS27
nb=7
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
nb=28
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
nb=35
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
nb=35
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN
read() returned EAGAIN