Change location providers to allow updates

Change location provider implementations so it is possible for
location providers to dynamically update the location. This
commit adds the interfaces and infrastructure in redshift.c
but none of the location provides are changed to become dynamic.

1 files changed, 6 insertions, 3 deletions

diff --git a/src/redshift.h b/src/redshift.h
index bac8e34..c659502 100644
--- a/src/redshift.h
+++ b/src/redshift.h
@@ -89,7 +89,9 @@ typedef void location_provider_free_func(void *state);
 typedef void location_provider_print_help_func(FILE *f);
 typedef int location_provider_set_option_func(void *state, const char *key,
 					      const char *value);
-typedef int location_provider_get_location_func(void *state, location_t *loc);
+typedef int location_provider_get_fd_func(void *state);
+typedef int location_provider_handle_func(
+	void *state, location_t *location, int *available);
 
 typedef struct {
 	char *name;
@@ -106,8 +108,9 @@ typedef struct {
 	/* Set an option key, value-pair. */
 	location_provider_set_option_func *set_option;
 
-	/* Get current location. */
-	location_provider_get_location_func *get_location;
+	/* Listen and handle location updates. */
+	location_provider_get_fd_func *get_fd;
+	location_provider_handle_func *handle;
 } location_provider_t;