Like Subprocess.communicate, but validates the output of the process as UTF-8, and returns it as a regular NUL terminated string.
On error, stdout_buf and stderr_buf will be set to undefined values and should not be used.
data to send to the stdin of the subprocess, or NULL
a gio.Cancellable
data read from the subprocess stdout
data read from the subprocess stderr
GException on failure.
Like Subprocess.communicate, but validates the output of the process as UTF-8, and returns it as a regular NUL terminated string.
On error, stdout_buf and stderr_buf will be set to undefined values and should not be used.