[RFC] net: picoping: try to make it asynchronious: fail

[Antony Pavlov]

Picotcp tends to work in an asynchronious way.

E.g. for ping we have to use "pico_icmp4_ping()"
(to start ping task) and the special icmp4 handler
(callback function) "cb_ping()".

But the ping command in barebox works in very simple
way:

  * user types 'ping <IP>' in the barebox shell command line;
  * the ping command takes all control until it gets the positive
    or a negative result;
  * the control is returned to the barebox shell.

To use asynchronious-oriented picotcp functions in syncronious-oriented
barebox workflow we have to work out necessary picotcp usage template.

This patch propose simplest template. But this template has two major
disadvantages:

  * user can't completely cancel ping using ctrl-c,
    the ping request send task continue to work in the background:

    barebox at barebox sandbox:/ picoping 10.0.0.2
    48 bytes from 10.0.0.2: icmp_req=1 ttl=64 time=0 ms
    48 bytes from 10.0.0.2: icmp_req=2 ttl=64 time=0 ms
    48 bytes from 10.0.0.2: icmp_req=3 ttl=64 time=0 ms
    <ctrl-c> pressed
    barebox at barebox sandbox:/ picoping 10.0.0.2
    48 bytes from 10.0.0.2: icmp_req=1 ttl=64 time=1 ms
    48 bytes from 10.0.0.2: icmp_req=5 ttl=64 time=0 ms
    48 bytes from 10.0.0.2: icmp_req=2 ttl=64 time=0 ms
    48 bytes from 10.0.0.2: icmp_req=6 ttl=64 time=0 ms
    48 bytes from 10.0.0.2: icmp_req=3 ttl=64 time=0 ms
    48 bytes from 10.0.0.2: icmp_req=7 ttl=64 time=0 ms
    48 bytes from 10.0.0.2: icmp_req=4 ttl=64 time=0 ms
    48 bytes from 10.0.0.2: icmp_req=8 ttl=64 time=0 ms

  * user has to press <ctrl-c> after the last ping response is received
    to return to barebox shell.

Has anybody any ideas how to improve the situation?
---
 net/test_picotcp.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/net/test_picotcp.c b/net/test_picotcp.c
index 5f7138e..035ef09 100644
--- a/net/test_picotcp.c
+++ b/net/test_picotcp.c
@@ -98,9 +98,15 @@ BAREBOX_CMD_START(test_picotcp)
 BAREBOX_CMD_END
 
 #include <pico_icmp4.h>
+#include <poller.h>
 
 #define NUM_PING 10
 
+#define PING_STATE_WORK		0
+#define PING_STATE_DONE		1
+
+static int ping_state;
+
 /* callback function for receiving ping reply */
 void cb_ping(struct pico_icmp4_stats *s)
 {
@@ -108,6 +114,10 @@ void cb_ping(struct pico_icmp4_stats *s)
 	int time_sec = 0;
 	int time_msec = 0;
 
+	if (ping_state == PING_STATE_DONE) {
+		return;
+	}
+
 	/* convert ip address from icmp4_stats structure to string */
 	pico_ipv4_to_string(host, s->dst.addr);
 
@@ -132,8 +142,19 @@ static int do_picoping(int argc, char *argv[])
 		return 1;
 	}
 
+	ping_state = PING_STATE_WORK;
+
 	pico_icmp4_ping(argv[1], NUM_PING, 1000, 5000, 48, cb_ping);
 
+	while (ping_state != PING_STATE_DONE) {
+		if (ctrlc()) {
+			ping_state = PING_STATE_DONE;
+			break;
+		}
+		get_time_ns();
+		poller_call();
+	}
+
 	return 0;
 }
 
-- 
1.9.2