Thread: Undo a pipe. It is possible?

Hi,

I have this code where I put the standard output of my program from the screen to the pipe called "p4".

Code:

close(p4[0]);    
close(1);
dup(p4[1]);
close(p4[1]);

My question is, is there any way to undo this if later in the program I want to use again my screen as standard output?

Thank you.

Use another dup() call to make a backup copy of whatever fd you want to go back to.

Thank you Salem so I make a dup(1) before the code in the first post and after this piece of code I make a close(1) to close the new standard output. Howevere, now screen is no longer standard output, now it's the pipe p4 so I can't just dup(1). What do I have to do now?

I mean:

Code:

dup(1);
close(p4[0]);       
close(1);
dup(p4[1]);
close(p4[1]);	

// Some code

close(1);
dup(?);

Thank you it works!