stdout and stderr in Linux

UNIXer,

Can I redirect the stdout and stderr to a temporary file by the following code ?
  filename=tmpnam(0);
  freopen(filename, "w", stderr);
  freopen(filename, "w", stdout);

But, how come I cannot print characters to the original stdout and stderr by doing the following code ?
  stdout=fopen("/dev/stdout", "w");
  stderr=fopen("/dev/stderr", "w");

Anyway, how can I achieve it ?

Andrew
andrewyuAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

seedyCommented:
By default stdin and stdout will be pointing to the terminal.
So, when you want to restore them, you would do
   stdout = fopen("/dev/tty", "w");
   stderr = fopen("/dev/tty", "w");
Hope this helps.
PS: Andrewyu, why is that you never grade answers?
   
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
seedyCommented:
BTW, there is no device like '/dev/stdout' or '/dev/stderr'.
From man pages for 'tty':
The file '/dev/tty' is, in each process, a synonym for the
control terminal associated with the process group of that
process, if any.
0
sinuCommented:
Go thru a good book on unix file io.

 there is no device like '/dev/stdout' or '/dev/stderr'.
From man pages for 'tty':
The file '/dev/tty' is, in each process, a synonym for the
control terminal associated with the process group of that
process, if any.
0
seedyCommented:
Sinu,
Hope you did not mean to do that!
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
System Programming

From novice to tech pro — start learning today.