On Thu, Jan 30, 2014 at 12:16:26PM +0500, Ayaz Akram wrote: > I observed that if i place printf in qemu at certain places like in > hw./serial.c file, I can see the printing when my guest OS is running on > qemu, while there are some other places like in pckbd.c (emulation of > keyboard), where if printf is used, I am not able to see any printing while > guest OS is running, but when I press ctrl+A and x i can see that > printing...... Any idea why this different behavior ??
Usually the problem is stdout buffering. See fflush(3) and use fprintf(stderr) instead for debugging. stderr is unbuffered by default on POSIX systems. I think on Windows you need to explicitly disable buffering for stderr. Stefan
