In gdb, we normally use r > log.txt to redirect stdout. This also runs the program.
Is there a way to redirect stdout (only, not stdin) without actually starting the program?
My intended workflow is:
redirect stdout to log.txt
call func1(a, b, c) # I want the stdout output going to log.txt, without any gdb info, just stdout
Note that tty command won't work in this case (I want to redirect stdout only).
My intended workflow is:
Your intended workflow will not work: you can't call func1(...) without first running the program.
It appears that what you want is (roughly):
start the program (runs to main).call func1(...) with its output redirected to a file.This answer shows how to redirect the output wherever you want at an arbitrary point in program execution.
start > logfile or some other way of using r > redirect without actually doing a full r?(gdb) starti > /tmp/output (gdb) call func1(...) doesn't work for you?start can't be redirected, but starti (which I was not familiar with) can be.