Flags to define the behaviour of a gio.Subprocess
Note that the default for stdin is to redirect from /dev/null. For stdout and stderr the default are for them to inherit the corresponding descriptor from the calling process.
Note that it is a programmer error to mix 'incompatible' flags. For example, you may not request both G_SUBPROCESS_FLAGS_STDOUT_PIPE and G_SUBPROCESS_FLAGS_STDOUT_SILENCE.
create a pipe for the stdin of the spawned process that can be accessed with Subprocess.getStdinPipe.
stdin is inherited from the calling process.
create a pipe for the stdout of the spawned process that can be accessed with Subprocess.getStdoutPipe.
silence the stdout of the spawned process (ie: redirect to /dev/null).
create a pipe for the stderr of the spawned process that can be accessed with Subprocess.getStderrPipe.
silence the stderr of the spawned process (ie: redirect to /dev/null).
merge the stderr of the spawned process with whatever the stdout happens to be. This is a good way of directing both streams to a common log file, for example.
spawned processes will inherit the file descriptors of their parent, unless those descriptors have been explicitly marked as close-on-exec. This flag has no effect over the "standard" file descriptors (stdin, stdout, stderr).