Add mapper-wait-until-removed
This option will do the opposite of mapper wait
by blocking if a dbus object exists until that
object is removed.
Change-Id: Ia460b1ffdb912ba475b15ae5f8499a177e801dfd
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/libmapper/app.c b/libmapper/app.c
index 7efc08c..aa42461 100644
--- a/libmapper/app.c
+++ b/libmapper/app.c
@@ -119,7 +119,10 @@
goto finish;
}
- r = mapper_wait_async(conn, loop, argv+2, quit, loop, &wait);
+ if (!strcmp(argv[1], "wait"))
+ r = mapper_wait_async(conn, loop, argv+2, quit, loop, &wait, true);
+ else if (!strcmp(argv[1], "wait-until-removed"))
+ r = mapper_wait_async(conn, loop, argv+2, quit, loop, &wait, false);
if(r < 0) {
fprintf(stderr, "Error configuring waitlist: %s\n",
strerror(-r));
@@ -178,6 +181,8 @@
"\nCOMMANDS:\n"
" call invoke the specified method\n"
" wait wait for the specified objects to appear on the DBus\n"
+ " wait-until-removed"
+ " wait until the specified objects are not present in the DBus\n"
" get-service return the service identifier for input path\n";
if(argc < 2) {
@@ -187,7 +192,8 @@
if(!strcmp(argv[1], "call"))
call_main(argc, argv);
- if(!strcmp(argv[1], "wait"))
+ if(!strcmp(argv[1], "wait") ||
+ !strcmp(argv[1], "wait-until-removed"))
wait_main(argc, argv);
if(!strcmp(argv[1], "get-service"))
get_service_main(argc, argv);
diff --git a/libmapper/mapper.c b/libmapper/mapper.c
index 962b4e0..ad64d4a 100644
--- a/libmapper/mapper.c
+++ b/libmapper/mapper.c
@@ -35,6 +35,11 @@
"interface='org.freedesktop.DBus.ObjectManager',"
"member='InterfacesAdded'";
+static const char *async_wait_interfaces_removed_match =
+ "type='signal',"
+ "interface='org.freedesktop.DBus.ObjectManager',"
+ "member='InterfacesRemoved'";
+
static const int mapper_busy_retries = 5;
static const uint64_t mapper_busy_delay_interval_usec = 1000000;
@@ -51,6 +56,7 @@
int count;
int finished;
int r;
+ bool added;
};
struct async_wait_callback_data
@@ -157,8 +163,12 @@
goto exit;
r = sd_bus_message_get_errno(m);
- if(r == ENOENT)
- goto exit;
+ if(r == ENOENT) {
+ if (wait->added)
+ goto exit;
+ else
+ r = 0;
+ }
if(r == EBUSY && data->retry < mapper_busy_retries) {
r = sd_event_now(wait->loop,
@@ -296,7 +306,8 @@
char *objs[],
void (*callback)(int, void *),
void *userdata,
- mapper_async_wait **w)
+ mapper_async_wait **w,
+ bool added)
{
int r;
mapper_async_wait *wait = NULL;
@@ -313,6 +324,7 @@
wait->count = sarraylen(objs);
if(!wait->count)
return 0;
+ wait->added = added;
wait->objs = sarraydup(objs);
if(!wait->objs) {
@@ -327,26 +339,39 @@
}
memset(wait->status, 0, sizeof(*wait->status) * wait->count);
- r = sd_bus_add_match(conn,
- &wait->introspection_slot,
- async_wait_introspection_match,
- async_wait_match_introspection_complete,
- wait);
- if(r < 0) {
- fprintf(stderr, "Error adding match rule: %s\n",
- strerror(-r));
- goto free_status;
- }
+ if (wait->added) {
+ r = sd_bus_add_match(conn,
+ &wait->introspection_slot,
+ async_wait_introspection_match,
+ async_wait_match_introspection_complete,
+ wait);
+ if(r < 0) {
+ fprintf(stderr, "Error adding match rule: %s\n",
+ strerror(-r));
+ goto free_status;
+ }
- r = sd_bus_add_match(conn,
- &wait->intf_slot,
- async_wait_interfaces_added_match,
- async_wait_match_introspection_complete,
- wait);
- if(r < 0) {
- fprintf(stderr, "Error adding match rule: %s\n",
- strerror(-r));
- goto unref_name_slot;
+ r = sd_bus_add_match(conn,
+ &wait->intf_slot,
+ async_wait_interfaces_added_match,
+ async_wait_match_introspection_complete,
+ wait);
+ if(r < 0) {
+ fprintf(stderr, "Error adding match rule: %s\n",
+ strerror(-r));
+ goto unref_name_slot;
+ }
+ } else {
+ r = sd_bus_add_match(conn,
+ &wait->intf_slot,
+ async_wait_interfaces_removed_match,
+ async_wait_match_introspection_complete,
+ wait);
+ if(r < 0) {
+ fprintf(stderr, "Error adding match rule: %s\n",
+ strerror(-r));
+ goto unref_name_slot;
+ }
}
r = async_wait_get_objects(wait);
diff --git a/libmapper/mapper.h b/libmapper/mapper.h
index 7459e15..9f85c5f 100644
--- a/libmapper/mapper.h
+++ b/libmapper/mapper.h
@@ -1,3 +1,4 @@
+#include <stdbool.h>
#include <systemd/sd-bus.h>
#include <systemd/sd-event.h>
@@ -8,7 +9,8 @@
void mapper_wait_async_free(mapper_async_wait *);
int mapper_wait_async(sd_bus *, sd_event *, char *[],
- void (*)(int, void *), void *, mapper_async_wait **);
+ void (*)(int, void *), void *, mapper_async_wait **,
+ bool);
int mapper_get_service(sd_bus *conn, const char *obj, char **service);
int mapper_get_object(sd_bus *conn, const char *obj, sd_bus_message **reply);
#ifdef __cplusplus