Add `-A` option to specify congestion control algorithm for tools (#487)

bin/prog.c

@@ -171,6 +171,11 @@ prog_print_common_options (const struct prog *prog, FILE *out)
 "                   sndbuf=12345    # Sets SO_SNDBUF\n"
 "                   rcvbuf=12345    # Sets SO_RCVBUF\n"
 "   -W          Use stock PMI (malloc & free)\n"
+"   -A CC_ALGO  Congestion control algorithm.  The following algorithms are\n"
+"                 supported.\n"
+"                   1: Cubic\n"
+"                   2: BBRv1\n"
+"                   3: Adaptive congestion control (this is the default).\n"
     );
 
 #if HAVE_SENDMMSG
@@ -266,6 +271,9 @@ prog_set_opt (struct prog *prog, int opt, const char *arg)
     case 'W':
         prog->prog_use_stock_pmi = 1;
         return 0;
+    case 'A':
+        prog->prog_settings.es_cc_algo = atoi(optarg);
+        return 0;
     case 'c':
         if (prog->prog_engine_flags & LSENG_SERVER)
         {

bin/prog.h

@@ -74,7 +74,7 @@ prog_init (struct prog *, unsigned lsquic_engine_flags, struct sport_head *,
 #   define IP_DONTFRAG_FLAG ""
 #endif
 
-#define PROG_OPTS "i:km:c:y:L:l:o:H:s:S:Y:z:G:W" RECVMMSG_FLAG SENDMMSG_FLAG \
+#define PROG_OPTS "i:km:c:y:L:l:o:H:s:S:Y:z:G:WA:" RECVMMSG_FLAG SENDMMSG_FLAG \
                                                             IP_DONTFRAG_FLAG
 
 /* Returns: