Implement slow start.

[utcp] / test.c

diff --git a/test.c b/test.c
index 474230818bb5f7e6c3fc5ffa586ec91cef7c7f15..757364f0f7e63432bf387ce6ce7a2637e45a9370 100644 (file)
--- a/test.c
+++ b/test.c
@@ -16,18 +16,21 @@
 struct utcp_connection *c;
 int dir = 3;
 bool running = true;
+double dropin;
+double dropout;
 
-int do_recv(struct utcp_connection *c, const void *data, size_t len) {
+ssize_t do_recv(struct utcp_connection *c, const void *data, size_t len) {
        if(!data || !len) {
-               if(errno)
+               if(errno) {
                        fprintf(stderr, "Error: %s\n", strerror(errno));
-               else {
+                       dir = 0;
+               } else {
                        dir &= ~2;
                        fprintf(stderr, "Connection closed by peer\n");
                }
-               return 0;
+               return -1;
        }
-       return write(0, data, len);
+       return write(1, data, len);
 }
 
 void do_accept(struct utcp_connection *nc, uint16_t port) {
@@ -35,13 +38,17 @@ void do_accept(struct utcp_connection *nc, uint16_t port) {
        c = nc;
 }
 
-int do_send(struct utcp *utcp, const void *data, size_t len) {
+ssize_t do_send(struct utcp *utcp, const void *data, size_t len) {
        int s = *(int *)utcp->priv;
-       return send(s, data, len, MSG_DONTWAIT);
+       if(drand48() >= dropout)
+               return send(s, data, len, MSG_DONTWAIT);
+       else
+               return len;
 }
 
 int main(int argc, char *argv[]) {
        srand(time(NULL));
+       srand48(time(NULL));
 
        if(argc < 2 || argc > 3)
                return 1;
@@ -49,6 +56,9 @@ int main(int argc, char *argv[]) {
        bool server = argc == 2;
        bool connected = false;
 
+       dropin = atof(getenv("DROPIN") ?: "0");
+       dropout = atof(getenv("DROPOUT") ?: "0");
+
        struct addrinfo *ai;
        struct addrinfo hint = {
                .ai_flags = server ? AI_PASSIVE : 0,
@@ -72,10 +82,15 @@ int main(int argc, char *argv[]) {
                connected = true;
        }
 
+       freeaddrinfo(ai);
+
        struct utcp *u = utcp_init(server ? do_accept : NULL, NULL, do_send, &s);
        if(!u)
                return 1;
 
+       utcp_set_mtu(u, 1300);
+       utcp_set_user_timeout(u, 10);
+
        if(!server)
                c = utcp_connect(u, 1, do_recv, NULL);
 
@@ -84,14 +99,11 @@ int main(int argc, char *argv[]) {
                {.fd = s, .events = POLLIN | POLLERR | POLLHUP},
        };
 
-       char buf[1024];
+       char buf[102400];
+       int timeout = utcp_timeout(u);
 
        while(dir) {
-               int r = poll(fds, 2, 1000);
-               if(!r) {
-                       utcp_timeout(u);
-                       continue;
-               }
+               poll(fds, 2, timeout);
 
                if(fds[0].revents) {
                        int len = read(0, buf, sizeof buf);
@@ -111,15 +123,18 @@ int main(int argc, char *argv[]) {
 
                if(fds[1].revents) {
                        struct sockaddr_storage ss;
-                       socklen_t sl;
+                       socklen_t sl = sizeof ss;
                        int len = recvfrom(s, buf, sizeof buf, MSG_DONTWAIT, (struct sockaddr *)&ss, &sl);
                        if(len <= 0)
                                break;
                        if(!connected)
                                if(!connect(s, (struct sockaddr *)&ss, sl))
                                        connected = true;
-                       utcp_recv(u, buf, len);
+                       if(drand48() >= dropin)
+                               utcp_recv(u, buf, len);
                }
+
+               timeout = utcp_timeout(u);
        };
 
        utcp_close(c);