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/* redshift-ng - Automatically adjust display colour temperature according the Sun
*
* Copyright (c) 2009-2018 Jon Lund Steffensen <jonlst@gmail.com>
* Copyright (c) 2014-2016, 2025 Mattias Andrée <m@maandree.se>
*
* redshift-ng is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* redshift-ng is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with redshift-ng. If not, see <http://www.gnu.org/licenses/>.
*/
#include "common.h"
const struct location_provider *location_providers[] = {
#ifdef ENABLE_GEOCLUE2
&geoclue2_location_provider,
#endif
#ifdef ENABLE_CORELOCATION
&corelocation_location_provider,
#endif
&manual_location_provider,
NULL
};
static int
try_start(const struct location_provider *provider, LOCATION_STATE **state, struct config_ini_state *config, char *args)
{
const char *manual_keys[] = {"lat", "lon"};
struct config_ini_section *section;
struct config_ini_setting *setting;
char *next_arg, *value;
const char *key;
int i;
if (provider->init(state) < 0) {
weprintf(_("Initialization of %s failed."), provider->name);
return -1;
}
/* Set provider options from config file. */
if ((section = config_ini_get_section(config, provider->name)))
for (setting = section->settings; setting; setting = setting->next)
if (provider->set_option(*state, setting->name, setting->value) < 0)
goto set_option_fail;
/* Set provider options from command line. */
for (i = 0; args; i++) {
next_arg = strchr(args, ':');
if (next_arg)
*next_arg++ = '\0';
key = args;
value = strchr(args, '=');
if (!value) {
/* The options for the "manual" method can be set
without keys on the command line for convencience
and for backwards compatability. We add the proper
keys here before calling set_option(). */
if (!strcmp(provider->name, "manual") && i < ELEMSOF(manual_keys)) {
key = manual_keys[i];
value = args;
} else {
weprintf(_("Failed to parse option `%s'."), args);
return -1;
}
} else {
*value++ = '\0';
}
if (provider->set_option(*state, key, value) < 0)
goto set_option_fail;
args = next_arg;
}
/* Start provider. */
if (provider->start(*state) < 0) {
provider->free(*state);
weprintf(_("Failed to start provider %s."), provider->name);
return -1;
}
return 0;
set_option_fail:
provider->free(*state);
weprintf(_("Failed to set %s option."), provider->name);
/* TRANSLATORS: `help' must not be translated. */
weprintf(_("Try `-l %s:help' for more information."), provider->name);
return -1;
}
static long long int
get_monotonic_millis(void)
{
#if defined(WINDOWS)
return (long long int)GetTickCount64();
#else
struct timespec now;
if (clock_gettime(CLOCK_MONOTONIC, &now))
eprintf("clock_gettime CLOCK_MONOTONIC:");
return (long long int)now.tv_sec * 1000LL + (long long int)now.tv_nsec / 1000000LL;
#endif
}
/* Wait for location to become available from provider.
Waits until timeout (milliseconds) has elapsed or forever if timeout
is -1. Writes location to loc. Returns -1 on error,
0 if timeout was reached, 1 if location became available. */
int
get_location(const struct location_provider *provider, LOCATION_STATE *state, int timeout, struct location *loc)
{
int r, available;
struct pollfd pollfds[1];
long long int now = get_monotonic_millis();
long long int end = now + (long long int)timeout;
do {
pollfds[0].fd = provider->get_fd(state);
if (pollfds[0].fd >= 0) {
/* Poll on file descriptor until ready. */
pollfds[0].events = POLLIN;
timeout = (int)MAX(end - now, 0);
r = poll(pollfds, 1, timeout);
if (r > 0) {
now = get_monotonic_millis();
} else if (r < 0) {
#ifndef WINDOWS
if (errno == EINTR)
continue;
#endif
weprintf("poll {{.fd=<location provider>, .events=EPOLLIN}} 1 %i:", timeout);
return -1;
} else {
return 0;
}
}
if (provider->handle(state, loc, &available) < 0)
return -1;
} while (!available);
return 1;
}
void
acquire_location_provider(struct settings *settings, LOCATION_STATE **location_state_out)
{
size_t i;
if (settings->provider) {
/* Use provider specified on command line. */
if (try_start(settings->provider, location_state_out, &settings->config, settings->provider_args) < 0)
exit(1);
} else {
/* Try all providers, use the first that works. */
for (i = 0; location_providers[i]; i++) {
weprintf(_("Trying location provider `%s'..."), location_providers[i]->name);
if (try_start(location_providers[i], location_state_out, &settings->config, NULL) < 0) {
weprintf(_("Trying next provider..."));
continue;
}
/* Found provider that works. */
printf(_("Using provider `%s'.\n"), location_providers[i]->name);
settings->provider = location_providers[i];
break;
}
/* Failure if no providers were successful at this point. */
if (!settings->provider)
eprintf(_("No more location providers to try."));
}
}
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