If this flag is given, stdin of the
child process is shared with stdin of its parent process.
It is redirected to /dev/null otherwise.
Redirect stderr of the test child to
/dev/null so it cannot be observed on the console during test
runs. The actual output is still captured though to allow later
tests with g_test_trap_assert_stderr().
Redirect stdout of the test child to
/dev/null so it cannot be observed on the console during test
runs. The actual output is still captured though to allow later
tests with g_test_trap_assert_stdout().
Test traps are guards around forked tests. These flags determine what traps to set.