[DEBUG] add an http_silent_debug function to debug HTTP states
This function outputs to fd #-1 the status of request and response
buffers, the transaction states, the stream interface states, etc...
That way, it's easy to find that output in an strace report, correctly
placed WRT the other syscalls.
diff --git a/src/proto_http.c b/src/proto_http.c
index 3cb8bd0..da0a8a8 100644
--- a/src/proto_http.c
+++ b/src/proto_http.c
@@ -361,6 +361,32 @@
/*
+ * Silent debug that outputs only in strace, using fd #-1. Trash is modified.
+ */
+#if defined(DEBUG_FSM)
+static void http_silent_debug(int line, struct session *s)
+{
+ int size = 0;
+ size += snprintf(trash + size, sizeof(trash) - size,
+ "[%04d] req: p=%d(%d) s=%d bf=%08x an=%08x data=%p size=%d l=%d w=%p r=%p lr=%p sm=%d fw=%ld tf=%08x\n",
+ line,
+ s->si[0].state, s->si[0].fd, s->txn.req.msg_state, s->req->flags, s->req->analysers,
+ s->req->data, s->req->size, s->req->l, s->req->w, s->req->r, s->req->lr, s->req->send_max, s->req->to_forward, s->txn.flags);
+ write(-1, trash, size);
+ size = 0;
+ size += snprintf(trash + size, sizeof(trash) - size,
+ " %04d rep: p=%d(%d) s=%d bf=%08x an=%08x data=%p size=%d l=%d w=%p r=%p lr=%p sm=%d fw=%ld\n",
+ line,
+ s->si[1].state, s->si[1].fd, s->txn.rsp.msg_state, s->rep->flags, s->rep->analysers,
+ s->rep->data, s->rep->size, s->rep->l, s->rep->w, s->rep->r, s->rep->lr, s->rep->send_max, s->rep->to_forward);
+
+ write(-1, trash, size);
+}
+#else
+#define http_silent_debug(l,s) do { } while (0)
+#endif
+
+/*
* Adds a header and its CRLF at the tail of buffer <b>, just before the last
* CRLF. Text length is measured first, so it cannot be NULL.
* The header is also automatically added to the index <hdr_idx>, and the end