[PATCH_v5 1/3] gatppp: add public suspend function

[Guillaume Zajac]

---
 gatchat/gatppp.c |   43 +++++++++++++++++++++++++++++++++++++++++++
 gatchat/gatppp.h |    1 +
 2 files changed, 44 insertions(+), 0 deletions(-)

diff --git a/gatchat/gatppp.c b/gatchat/gatppp.c
index c776811..2d051d5 100644
--- a/gatchat/gatppp.c
+++ b/gatchat/gatppp.c
@@ -46,6 +46,9 @@
 #define PPP_ADDR_FIELD 0xff
 #define PPP_CTRL       0x03
 
+/* Time to wait before and after +++ sequence */
+#define GUARD_TIMEOUTS 1500
+
 enum ppp_phase {
        PPP_PHASE_DEAD = 0,             /* Link dead */
        PPP_PHASE_ESTABLISHMENT,        /* LCP started */
@@ -78,6 +81,7 @@ struct _GAtPPP {
        guint ppp_dead_source;
        GAtSuspendFunc suspend_func;
        gpointer suspend_data;
+       guint guard_timeout_src;
 };
 
 void ppp_debug(GAtPPP *ppp, const char *str)
@@ -500,6 +504,40 @@ void g_at_ppp_shutdown(GAtPPP *ppp)
        pppcp_signal_close(ppp->lcp);
 }
 
+static gboolean call_suspend_cb(gpointer user_data)
+{
+       GAtPPP *ppp = user_data;
+
+       ppp->guard_timeout_src = 0;
+
+       if (ppp->suspend_func)
+               ppp->suspend_func(ppp->suspend_data);
+
+       return FALSE;
+}
+
+static gboolean send_escape_sequence(gpointer user_data)
+{
+       GAtPPP *ppp = user_data;
+       GAtIO *io = g_at_hdlc_get_io(ppp->hdlc);
+
+       ppp->guard_timeout_src = 0;
+       g_at_io_write(io, "+++", 3);
+       ppp->guard_timeout_src  = g_timeout_add(GUARD_TIMEOUTS, 
call_suspend_cb, ppp);
+
+       return FALSE;
+}
+
+void g_at_ppp_suspend(GAtPPP *ppp)
+{
+       if (ppp == NULL)
+               return;
+
+       ppp_net_suspend_interface(ppp->net);
+       g_at_hdlc_suspend(ppp->hdlc);
+       ppp->guard_timeout_src = g_timeout_add(GUARD_TIMEOUTS, 
send_escape_sequence, ppp);
+}
+
 void g_at_ppp_ref(GAtPPP *ppp)
 {
        g_atomic_int_inc(&ppp->ref_count);
@@ -534,6 +572,11 @@ void g_at_ppp_unref(GAtPPP *ppp)
                ppp->ppp_dead_source = 0;
        }
 
+       if (ppp->guard_timeout_src) {
+               g_source_remove(ppp->guard_timeout_src);
+               ppp->guard_timeout_src = 0;
+       }
+
        g_at_hdlc_unref(ppp->hdlc);
 
        g_free(ppp);
diff --git a/gatchat/gatppp.h b/gatchat/gatppp.h
index 9464ffd..66e0ade 100644
--- a/gatchat/gatppp.h
+++ b/gatchat/gatppp.h
@@ -64,6 +64,7 @@ void g_at_ppp_set_suspend_function(GAtPPP *ppp, 
GAtSuspendFunc func,
                                        gpointer user_data);
 void g_at_ppp_set_debug(GAtPPP *ppp, GAtDebugFunc func, gpointer user_data);
 void g_at_ppp_shutdown(GAtPPP *ppp);
+void g_at_ppp_suspend(GAtPPP *ppp);
 void g_at_ppp_ref(GAtPPP *ppp);
 void g_at_ppp_unref(GAtPPP *ppp);
 
-- 
1.7.1

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