diff mbox series

[4/7] multipathd: open client socket early

Message ID 20181023220552.1306-5-mwilck@suse.com (mailing list archive)
State Not Applicable, archived
Delegated to: christophe varoqui
Headers show
Series multipathd: make uxlsnr errors really fatal | expand

Commit Message

Martin Wilck Oct. 23, 2018, 10:05 p.m. UTC 
Open the unix socket in multipathd code and pass the fd to
uxsock_listen(). This will enable us to make the main thread
wait for successful socket initialization in a follow-up patch.

Signed-off-by: Martin Wilck <mwilck@suse.com>
---
 multipathd/main.c   | 17 ++++++++++++++---
 multipathd/uxlsnr.c | 11 ++---------
 multipathd/uxlsnr.h |  2 +-
 3 files changed, 17 insertions(+), 13 deletions(-)

Comments

Benjamin Marzinski Oct. 26, 2018, 6:57 p.m. UTC | #1 
On Wed, Oct 24, 2018 at 12:05:49AM +0200, Martin Wilck wrote:
> Open the unix socket in multipathd code and pass the fd to
> uxsock_listen(). This will enable us to make the main thread
> wait for successful socket initialization in a follow-up patch.
> 
> Signed-off-by: Martin Wilck <mwilck@suse.com>
> ---
>  multipathd/main.c   | 17 ++++++++++++++---
>  multipathd/uxlsnr.c | 11 ++---------
>  multipathd/uxlsnr.h |  2 +-
>  3 files changed, 17 insertions(+), 13 deletions(-)
> 
> diff --git a/multipathd/main.c b/multipathd/main.c
> index 083abf28..50f69171 100644
> --- a/multipathd/main.c
> +++ b/multipathd/main.c
> @@ -66,6 +66,7 @@ static int use_watchdog;
>  #include "pgpolicies.h"
>  #include "uevent.h"
>  #include "log.h"
> +#include "uxsock.h"
>  
>  #include "mpath_cmd.h"
>  #include "mpath_persist.h"
> @@ -1494,12 +1495,22 @@ uevqloop (void * ap)
>  static void *
>  uxlsnrloop (void * ap)
>  {
> +	int ux_sock;
> +
> +	pthread_cleanup_push(rcu_unregister, NULL);
> +	rcu_register_thread();
> +
> +	ux_sock = ux_socket_listen(DEFAULT_SOCKET);
> +	if (ux_sock == -1)  {
> +		condlog(1, "could not create uxsock: %d", errno);
> +		exit_daemon();

I'm pretty sure you want to goto the end of the function, where you
pthread_cleanup_pop(), instead of returning NULL right here.  According
the to the pthread_cleanup_push() man page "Clean-up handlers are not
called if the thread terminates by performing a return from the thread
start function."

> +		return NULL;
> +	}
> +
>  	if (cli_init()) {
>  		condlog(1, "Failed to init uxsock listener");
>  		return NULL;
>  	}
> -	pthread_cleanup_push(rcu_unregister, NULL);
> -	rcu_register_thread();
>  	set_handler_callback(LIST+PATHS, cli_list_paths);
>  	set_handler_callback(LIST+PATHS+FMT, cli_list_paths_fmt);
>  	set_handler_callback(LIST+PATHS+RAW+FMT, cli_list_paths_raw);
> @@ -1554,7 +1565,7 @@ uxlsnrloop (void * ap)
>  	set_handler_callback(UNSETPRKEY+MAP, cli_unsetprkey);
>  
>  	umask(077);
> -	uxsock_listen(&uxsock_trigger, ap);
> +	uxsock_listen(&uxsock_trigger, ux_sock, ap);
>  	pthread_cleanup_pop(1);
>  	return NULL;
>  }
> diff --git a/multipathd/uxlsnr.c b/multipathd/uxlsnr.c
> index 6f666663..04967e9a 100644
> --- a/multipathd/uxlsnr.c
> +++ b/multipathd/uxlsnr.c
> @@ -165,22 +165,15 @@ void uxsock_cleanup(void *arg)
>  /*
>   * entry point
>   */
> -void * uxsock_listen(uxsock_trigger_fn uxsock_trigger, void * trigger_data)
> +void * uxsock_listen(uxsock_trigger_fn uxsock_trigger, long ux_sock,
> +		     void * trigger_data)
>  {
> -	long ux_sock;
>  	int rlen;
>  	char *inbuf;
>  	char *reply;
>  	sigset_t mask;
>  	int old_clients = MIN_POLLS;
>  
> -	ux_sock = ux_socket_listen(DEFAULT_SOCKET);
> -
> -	if (ux_sock == -1) {
> -		condlog(1, "could not create uxsock: %d", errno);
> -		exit_daemon();
> -	}
> -
>  	pthread_cleanup_push(uxsock_cleanup, (void *)ux_sock);
>  
>  	condlog(3, "uxsock: startup listener");
> diff --git a/multipathd/uxlsnr.h b/multipathd/uxlsnr.h
> index d51a8f99..c7f25b2b 100644
> --- a/multipathd/uxlsnr.h
> +++ b/multipathd/uxlsnr.h
> @@ -5,7 +5,7 @@
>  
>  typedef int (uxsock_trigger_fn)(char *, char **, int *, bool, void *);
>  
> -void * uxsock_listen(uxsock_trigger_fn uxsock_trigger,
> +void * uxsock_listen(uxsock_trigger_fn uxsock_trigger, long ux_sock,
>  		     void * trigger_data);
>  
>  #endif
> -- 
> 2.19.1

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diff mbox series

Patch

diff --git a/multipathd/main.c b/multipathd/main.c
index 083abf28..50f69171 100644
--- a/multipathd/main.c
+++ b/multipathd/main.c
@@ -66,6 +66,7 @@  static int use_watchdog;
 #include "pgpolicies.h"
 #include "uevent.h"
 #include "log.h"
+#include "uxsock.h"
 
 #include "mpath_cmd.h"
 #include "mpath_persist.h"
@@ -1494,12 +1495,22 @@  uevqloop (void * ap)
 static void *
 uxlsnrloop (void * ap)
 {
+	int ux_sock;
+
+	pthread_cleanup_push(rcu_unregister, NULL);
+	rcu_register_thread();
+
+	ux_sock = ux_socket_listen(DEFAULT_SOCKET);
+	if (ux_sock == -1)  {
+		condlog(1, "could not create uxsock: %d", errno);
+		exit_daemon();
+		return NULL;
+	}
+
 	if (cli_init()) {
 		condlog(1, "Failed to init uxsock listener");
 		return NULL;
 	}
-	pthread_cleanup_push(rcu_unregister, NULL);
-	rcu_register_thread();
 	set_handler_callback(LIST+PATHS, cli_list_paths);
 	set_handler_callback(LIST+PATHS+FMT, cli_list_paths_fmt);
 	set_handler_callback(LIST+PATHS+RAW+FMT, cli_list_paths_raw);
@@ -1554,7 +1565,7 @@  uxlsnrloop (void * ap)
 	set_handler_callback(UNSETPRKEY+MAP, cli_unsetprkey);
 
 	umask(077);
-	uxsock_listen(&uxsock_trigger, ap);
+	uxsock_listen(&uxsock_trigger, ux_sock, ap);
 	pthread_cleanup_pop(1);
 	return NULL;
 }
diff --git a/multipathd/uxlsnr.c b/multipathd/uxlsnr.c
index 6f666663..04967e9a 100644
--- a/multipathd/uxlsnr.c
+++ b/multipathd/uxlsnr.c
@@ -165,22 +165,15 @@  void uxsock_cleanup(void *arg)
 /*
  * entry point
  */
-void * uxsock_listen(uxsock_trigger_fn uxsock_trigger, void * trigger_data)
+void * uxsock_listen(uxsock_trigger_fn uxsock_trigger, long ux_sock,
+		     void * trigger_data)
 {
-	long ux_sock;
 	int rlen;
 	char *inbuf;
 	char *reply;
 	sigset_t mask;
 	int old_clients = MIN_POLLS;
 
-	ux_sock = ux_socket_listen(DEFAULT_SOCKET);
-
-	if (ux_sock == -1) {
-		condlog(1, "could not create uxsock: %d", errno);
-		exit_daemon();
-	}
-
 	pthread_cleanup_push(uxsock_cleanup, (void *)ux_sock);
 
 	condlog(3, "uxsock: startup listener");
diff --git a/multipathd/uxlsnr.h b/multipathd/uxlsnr.h
index d51a8f99..c7f25b2b 100644
--- a/multipathd/uxlsnr.h
+++ b/multipathd/uxlsnr.h
@@ -5,7 +5,7 @@ 
 
 typedef int (uxsock_trigger_fn)(char *, char **, int *, bool, void *);
 
-void * uxsock_listen(uxsock_trigger_fn uxsock_trigger,
+void * uxsock_listen(uxsock_trigger_fn uxsock_trigger, long ux_sock,
 		     void * trigger_data);
 
 #endif