Redirecting stdout to a file in C code

Question

I output to stdout. How can I redirect this to a new file using code? While we run the program, we can redirect as ./sample > test.txt . How to do this when executing the sample program itself? (C programming)

Answer 1

You probably want to use freopen .

Example from the link:

 #include <stdio.h> ... FILE *fp; ... fp = freopen ("/tmp/logfile", "a+", stdout); 

Answer 2

Use freopen() .

Answer 3

Use the dup2() system call and redirect the output to a file.