Mail: added missing event handling after blocking events.

As long as a read event is blocked (ignored), ngx_handle_read_event()
needs to be called to make sure no further notifications will be
triggered when using level-triggered event methods, such as select() or
poll().

src/mail/ngx_mail_imap_handler.c

diff --git a/src/mail/ngx_mail_imap_handler.c b/src/mail/ngx_mail_imap_handler.c
index 3bf09ec..e31e4d0 100644
--- a/src/mail/ngx_mail_imap_handler.c
+++ b/src/mail/ngx_mail_imap_handler.c
@@ -123,6 +123,12 @@
     if (s->out.len) {
         ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "imap send handler busy");
         s->blocked = 1;
+
+        if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
+            ngx_mail_close_connection(c);
+            return;
+        }
+
         return;
     }
 

src/mail/ngx_mail_pop3_handler.c

diff --git a/src/mail/ngx_mail_pop3_handler.c b/src/mail/ngx_mail_pop3_handler.c
index 9310c27..019927d 100644
--- a/src/mail/ngx_mail_pop3_handler.c
+++ b/src/mail/ngx_mail_pop3_handler.c
@@ -138,6 +138,12 @@
     if (s->out.len) {
         ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "pop3 send handler busy");
         s->blocked = 1;
+
+        if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
+            ngx_mail_close_connection(c);
+            return;
+        }
+
         return;
     }
 

src/mail/ngx_mail_smtp_handler.c

diff --git a/src/mail/ngx_mail_smtp_handler.c b/src/mail/ngx_mail_smtp_handler.c
index f1017e0..dcf658e 100644
--- a/src/mail/ngx_mail_smtp_handler.c
+++ b/src/mail/ngx_mail_smtp_handler.c
@@ -449,6 +449,12 @@
     if (s->out.len) {
         ngx_log_debug0(NGX_LOG_DEBUG_MAIL, c->log, 0, "smtp send handler busy");
         s->blocked = 1;
+
+        if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
+            ngx_mail_close_connection(c);
+            return;
+        }
+
         return;
     }