On Mon, Apr 23, 2012 at 03:45:00PM +0530, Arun KS wrote:

Hello Guys,

We all know that when an application writes to stdout, data ends up in
the console.

Okey so if I m on my development board and if I run an app, all the
prints comes to the console (eg /dev/ttyS0).
If I m on any server using ssh and all apps prints comes on my putty
(eg through /dev/pts/176).

Where is the code which maps fd 1 to the console in kernel?
If you guys have any pointers, please share.

While opening a device (for eg /dev/something), the vfs calls that
drivers, whose major and minor number matches.
But in case of stdout, how vfs resolves the write to the fd 1 and send
it to the corresponding console driver?

Thanks,
Arun

It's in init/main.c, around line 823.

"strace" is a useful tool for trying to figure out what exactly a user
space process does.

The man pages of various system calls (open, fork, exec, dup, etc.) may
also provide valuable information.


Thanks,
	Jonathan Neusch?fer