[Nbd] [PATCH 10/11] nbd-server: block SIGCHLD when handling SIGTERM, and visa versa

["Dmitry V. Levin" <ldv@...1147...>]

SIGCHLD handler must be blocked during execution of SIGTERM handler,
and visa versa, because the former changes "children" hash table
iterated by the latter.

Signed-off-by: Dmitry V. Levin <ldv@...1147...>
---
 nbd-server.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/nbd-server.c b/nbd-server.c
index 0868447..80681c7 100644
--- a/nbd-server.c
+++ b/nbd-server.c
@@ -2454,11 +2454,14 @@ void setup_servers(GArray* servers) {
 
 	sa.sa_handler = sigchld_handler;
 	sigemptyset(&sa.sa_mask);
+	sigaddset(&sa.sa_mask, SIGTERM);
 	sa.sa_flags = SA_RESTART;
 	if(sigaction(SIGCHLD, &sa, NULL) == -1)
 		err("sigaction: %m");
+
 	sa.sa_handler = sigterm_handler;
 	sigemptyset(&sa.sa_mask);
+	sigaddset(&sa.sa_mask, SIGCHLD);
 	sa.sa_flags = SA_RESTART;
 	if(sigaction(SIGTERM, &sa, NULL) == -1)
 		err("sigaction: %m");
-- 
ldv