stdout « write « C File Q&A

1. Writing to both stdout & a file    stackoverflow.com

I have a parent process which forks out a child to perform execv(). I need the output given by execv() to stdout to be displayed onscreen as also copied to a log ...

2. Want to write in stdout after closing the file opened using freopen    stackoverflow.com

I'm using fork(). However, before executing fork(), I open a file (say a.txt) using freopen for writing. Now the child process redirects the output of execlp to a.txt. After terminating ...

3. switch between writing to file and stdout    stackoverflow.com

I want to switch between writing to the file and to the stdout I can't use fprintf, but only printf and freopen something like this:

for(size_t i;i<100;++i)
{
     if(i%2)
   ...

4. writing stdout to a file    cboard.cprogramming.com