Re: [OpenWrt-Devel] [PATCH] procd: service gets deleted when its last instance is freed

[Alin Năstac]

Hi John,

On Fri, Feb 24, 2017 at 10:53 AM, John Crispin  wrote:
> can you write a little more info as to why this is needed and what
> scenario this fixes/changes ?

1) root@OpenWrt:~# uci show system.ntp
system.ntp=timeserver
system.ntp.enable_server='0'
system.ntp.use_dhcp='1'
system.ntp.dhcp_interface='wan'
2) root@OpenWrt:~# uci show network.wan
network.wan=interface
network.wan.proto='dhcp'
network.wan.ifname='eth4'
network.wan.reqopts='1 3 6 15 33 42 51 121 249'
3) restart wan interface using ifup command
4) sysntpd service will be down afterwards although dhcp lease has an option 42

Because service is deleted when last instance gets freed, its triggers
will also released. Without these triggers in place, sysntpd will not
be reloaded when a new dhcp lease containing option 42 will be
received.
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Re: [OpenWrt-Devel] [PATCH] procd: service gets deleted when its last instance is freed

[John Crispin]

On 24/02/2017 10:26, Alin Nastac wrote:
> Signed-off-by: Alin Nastac 

Hi,

can you write a little more info as to why this is needed and what
scenario this fixes/changes ?

John

> ---
>  service/service.c | 5 -
>  service/service.h | 1 +
>  2 files changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/service/service.c b/service/service.c
> index 0584ee0..9675ba2 100644
> --- a/service/service.c
> +++ b/service/service.c
> @@ -140,6 +140,8 @@ service_update(struct service *s, struct blob_attr **tb, 
> bool add)
>   vlist_flush(>instances);
>   }
>  
> + s->deleted = false;
> +
>   rc(s->name, "running");
>  
>   return 0;
> @@ -149,6 +151,7 @@ static void
>  service_delete(struct service *s)
>  {
>   vlist_flush_all(>instances);
> + s->deleted = true;
>   service_stopped(s);
>  }
>  
> @@ -602,7 +605,7 @@ service_start_early(char *name, char *cmdline)
>  
>  void service_stopped(struct service *s)
>  {
> - if (avl_is_empty(>instances.avl)) {
> + if (s->deleted && avl_is_empty(>instances.avl)) {
>   service_event("service.stop", s->name, NULL);
>   avl_delete(, >avl);
>   trigger_del(s);
> diff --git a/service/service.h b/service/service.h
> index d4f0a83..cc629b1 100644
> --- a/service/service.h
> +++ b/service/service.h
> @@ -40,6 +40,7 @@ struct validate {
>  struct service {
>   struct avl_node avl;
>   const char *name;
> + bool deleted;
>  
>   struct blob_attr *trigger;
>   struct vlist_tree instances;
> 
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[OpenWrt-Devel] [PATCH] procd: service gets deleted when its last instance is freed

[Alin Nastac]

Signed-off-by: Alin Nastac 
---
 service/service.c | 5 -
 service/service.h | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/service/service.c b/service/service.c
index 0584ee0..9675ba2 100644
--- a/service/service.c
+++ b/service/service.c
@@ -140,6 +140,8 @@ service_update(struct service *s, struct blob_attr **tb, 
bool add)
vlist_flush(>instances);
}
 
+   s->deleted = false;
+
rc(s->name, "running");
 
return 0;
@@ -149,6 +151,7 @@ static void
 service_delete(struct service *s)
 {
vlist_flush_all(>instances);
+   s->deleted = true;
service_stopped(s);
 }
 
@@ -602,7 +605,7 @@ service_start_early(char *name, char *cmdline)
 
 void service_stopped(struct service *s)
 {
-   if (avl_is_empty(>instances.avl)) {
+   if (s->deleted && avl_is_empty(>instances.avl)) {
service_event("service.stop", s->name, NULL);
avl_delete(, >avl);
trigger_del(s);
diff --git a/service/service.h b/service/service.h
index d4f0a83..cc629b1 100644
--- a/service/service.h
+++ b/service/service.h
@@ -40,6 +40,7 @@ struct validate {
 struct service {
struct avl_node avl;
const char *name;
+   bool deleted;
 
struct blob_attr *trigger;
struct vlist_tree instances;
-- 
1.7.12.4
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