CODEWITHSUNDEEP
valgrind
user1424739
user1424739

Reputation: 13755

Is it possible to ignore the program's stdout while running valgrind?

I use the following command to run valgrind. But the ./main's output will be mixed with the output of valgrind. I want to keep valgrind's output to stdout. Is there a way to ignore ./main's stdout? Thanks.

valgrind --tool=callgrind --dump-instr=yes --collect-jumps=yes --callgrind-out-file=/dev/stdout ./main

Upvotes: 2

Views: 645

Answers (1)

Florian Weimer
Florian Weimer

Reputation: 33747

You can use /proc/$$/fd/1 to refer to the original standard output in the calling shell, before the redirection, like this:

valgrind --tool=callgrind --callgrind-out-file=/proc/$$/fd/1 /bin/echo foo > /dev/null

If the system does not support /proc/$$/fd but has /dev/fd (for the current process), this might work (within a script, using bash):

exec {old_stdout}>&1
valgrind --tool=callgrind --callgrind-out-file=/dev/fd/$old_stdout /bin/echo foo > /dev/null

Upvotes: 1

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