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Old 02-21-2005, 05:46 AM   #1
Registered: Dec 2004
Posts: 32

Rep: Reputation: 15
Reopen the stdout and stderr

Hello All,

Is it possible to reopen the stdout and stderr descriptos after closing them.

For e.g.

int main()
FILE *ftemp = fopen("/tmp/one.txt", "w+");
int fd = fileno(ftemp);
close(1); /* close the stdout associated with screen */
close(2); /* close the stderr associated with screen */

dup(fd); /* one.txt is new stdout for the process */
dup(fd); /* one.txt is new stderr for the process */

close(1); /* close the one.txt stdout */
close(2); /* close the one.txt stderr */

Now here is it possible to associate and 1 and 2 file descriptors to screen?


return 0;

This I need because some part of program output (and error) I want to redirect it to a file and other on a screen.

// Rahul
Old 02-21-2005, 05:57 AM   #2
LQ 5k Club
Registered: Oct 2003
Location: Western Australia
Distribution: debian IceWM
Posts: 5,762

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I umm only read the last line.....

try just running your command and pipe it to a file at the beginning of the run

eg file to run > /home/yourname/myoutput.txt

> creates file "myoutput.txt"

>> would append to a file if you needed to do several runs?
Old 02-21-2005, 06:03 AM   #3
Registered: Dec 2004
Posts: 32

Original Poster
Rep: Reputation: 15
I want to do it from the C program and not by using the redirection operator on command line as I want log some output on the screen and some in the file.

// Rahul
Old 02-21-2005, 06:55 AM   #4
Registered: Feb 2004
Location: Outside Paris
Distribution: Solaris 11.4, Oracle Linux, Mint, Ubuntu/WSL
Posts: 9,785

Rep: Reputation: 492Reputation: 492Reputation: 492Reputation: 492Reputation: 492
open /dev/tty, and it should go to your keyboard/screen


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