Make do_link_ports() only create proxies. Previously it ran the event
loop once per attempted link to detect link creation errors. Rename it
to create_link_proxies() to make things clear.
Created proxies are stored into a list (data->link_targets).
create_link_proxies() returns the number of link proxies created. This
can be zero when the two matching nodes have zero ports.
Refactor main() to use create_link_proxies(), ask for a sync then run
the event loop. It will stop on sync done, and we will have received
all potential link proxy errors.
Cleanup all proxies and listeners at the end of main().
In a scenario where pw-link is called without a session manager running,
the output port on a node will not exist. In such a case, we broke out
of the for loop with all_links_exist set to true and returning EEXIST.
The return of EEXIST gives a confusing error message. Fix this.
With this commit, something like
`pw-link -d my-device alsa_output.headset` can be used to destroy
all links from output ports of `my-device` to input ports of
`alsa_output.headset`.
This allows to call pw-link with output and input nodes instead of
ports and pw-link will connect all output ports from the first node
to all input ports in the second node by port-id.
Note that the number of ports in each node isn't checked before
starting, so the ports will be connected until there's no matching
port to connect (i.e. if the output node has 2 output ports and
the input node has 5 ports, then only the first two ports will be
connected).
Library code generally shouldn't modify global state, so pw_init()
should not result to changing the C locale.
Instead, set the C locale in main() for tools and daemons.
We'll still setlocale for LC_MESSAGES, to get translated UI elements in
wireplumber. This workaround should be removed eventually...
Make all tools output to stdout (pw-mon mostly) so that we can pipe the
output around.
Send errors to stderr.
fprintf(stdout, ...) -> printf(...)
setlinebuf for stdout so that pipe works better.
See #2110
