Actually send (random) data.

[jam] / jam.c

diff --git a/jam.c b/jam.c
index 3b38d0217587f00d08e319eee7a1f5191f190599..1da8fc84f282189882fe5a4eddc6ff732bbd50df 100644 (file)
--- a/jam.c
+++ b/jam.c
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <math.h>
 #include <string.h>
 #include <stdlib.h>
 #include <getopt.h>
@@ -19,15 +20,29 @@ unsigned num_sources = 0;
 unsigned room_sources = 0;
 
 unsigned num_senders = 128;
+unsigned do_listen = 1;
 
 const static struct option longopts[] = {
        { "source-list", required_argument, NULL, 's' },
        { "destination-list", required_argument, NULL, 'd' },
        { "num-senders", required_argument, NULL, 'n' },
        { "port", required_argument, NULL, 'p' },
+       { "sender-only", no_argument, NULL, 'o' },
        { NULL, 0, NULL, 0 }
 };
 
+// generates from [0,1>
+double gen_uniform_random()
+{
+       return rand() / (RAND_MAX+1.0);
+}
+
+double gen_pareto_random(double min, double k)
+{
+       double u = gen_uniform_random();
+       return min * pow(u, -1.0 / k);
+}
+
 void read_ip_list(char *filename, struct in_addr **addr_list, unsigned *num, unsigned *room)
 {
        char buf[256];
@@ -88,7 +103,7 @@ void parse_options(int argc, char **argv)
        int option_index = 0;
 
        for ( ;; ) {
-               int c = getopt_long(argc, argv, "s:d:n:p:", longopts, &option_index); 
+               int c = getopt_long(argc, argv, "s:d:n:p:o", longopts, &option_index); 
                switch (c) {
                case 's':
                        read_ip_list(optarg, &sources, &num_sources, &room_sources);
@@ -102,6 +117,9 @@ void parse_options(int argc, char **argv)
                case 'p':
                        port = atoi(optarg);
                        break;
+               case 'o':
+                       do_listen = 0;
+                       break;
                case -1:
                        return;       // end of argument list
                default:
@@ -113,7 +131,61 @@ void parse_options(int argc, char **argv)
 
 void *sender_worker(void *arg)
 {
-       printf("Dummy sender worker\n");
+       unsigned i;
+       int sock;
+       char buf[65536];
+
+       for (i = 0; i < 65536; ++i)
+               buf[i] = rand() & 0xff;
+
+       for (i = 0; i < 1000; ++i) {
+               unsigned src_num = (unsigned)(num_sources * gen_uniform_random());
+               unsigned dst_num = (unsigned)(num_destinations * gen_uniform_random());
+               unsigned num_bytes = (unsigned)gen_pareto_random(1048576.0, 1.0);
+               struct sockaddr_in sin;
+
+               sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+               if (sock == -1) {
+                       perror("socket()");
+                       exit(1);
+               }
+               
+               // FIXME: bind to the right source
+               
+               sin.sin_family = AF_INET;
+               sin.sin_port = htons(port);
+               sin.sin_addr = destinations[dst_num];
+       
+               fprintf(stderr, "connecting %u\n", i);
+
+               if (connect(sock, (struct sockaddr *)&sin, sizeof(sin)) == -1) {
+                       perror("connect()");
+                       exit(1);
+               }
+               
+               fprintf(stderr, "connected\n");
+
+               while (num_bytes > 0) {
+                       unsigned bytes_to_send = num_bytes;
+                       unsigned ret;
+
+                       if (bytes_to_send > 65536) {
+                               bytes_to_send = 65536;  
+                       }
+
+                       ret = send(sock, buf, bytes_to_send, MSG_NOSIGNAL);
+                       if (ret == -1) {
+                               perror("send()");
+                               exit(1);
+                       }
+
+                       num_bytes -= ret;
+               }
+               fprintf(stderr, "sent\n");
+
+               close(sock);
+       }
+
        pthread_exit(0);
 }
 
@@ -122,8 +194,6 @@ void *receiver_worker(void *arg)
        int sock = (int)arg;
        char buf[65536];
 
-       printf("Received worker for socket %u\n", sock);
-
        for ( ;; ) {
                int ret = read(sock, buf, 65536);
                if (ret == 0)
@@ -131,8 +201,6 @@ void *receiver_worker(void *arg)
 
                // FIXME: update stats here
        }
-
-       printf("Socket %u done\n", sock);
        
        if (close(sock) == -1) {
                perror("close()");
@@ -188,7 +256,9 @@ int main(int argc, char **argv)
                fprintf(stderr, "Missing or empty source or destination host list. Aborting.\n");
        }
 
-       server_sock = get_server_socket(port);
+       if (do_listen) {
+               server_sock = get_server_socket(port);
+       }
        
        printf("Sending data on port %u from %u sources to %u destinations.\n\n",
                port, num_sources, num_destinations);
@@ -204,6 +274,11 @@ int main(int argc, char **argv)
                exit(1);
        }
 
+       if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0) {
+               perror("pthread_attr_setdetachstate");
+               exit(1);
+       }
+
        // Fire off sender workers.
        for (i = 0; i < num_senders; ++i) {
                pthread_t thread;
@@ -219,6 +294,11 @@ int main(int argc, char **argv)
         * thread for each (which will just gobble up the data until
         * we're done).
         */
+       if (!do_listen) {
+               sleep(3600);
+               exit(0);
+       }
+
        for ( ;; ) {
                struct sockaddr_in addr;
                socklen_t addr_len = sizeof(addr);