+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+
+#include <mLib/alloc.h>
+#include <mLib/conn.h>
+#include <mLib/mdwopt.h>
+#include <mLib/quis.h>
+#include <mLib/report.h>
+#include <mLib/sel.h>
+#include <mLib/tv.h>
+
+typedef struct blast {
+ conn c;
+ sel_timer t;
+} blast;
+
+static struct sockaddr_in sin;
+static sel_state sel;
+static struct timeval ctv = { 0, 500000 };
+static sel_timer sec;
+static unsigned count = 0;
+
+static void timers(void);
+
+static void stats(struct timeval *tv, void *p)
+{
+ static char baton[5] = "/-\\|";
+ static char *bt = baton;
+ struct timeval ttv;
+ printf("\r%c %u connections/second", *bt++, count);
+ if (!*bt)
+ bt = baton;
+ fflush(stdout);
+ count = 0;
+ TV_ADDL(&ttv, tv, 1, 0);
+ sel_addtimer(&sel, &sec, &ttv, stats, p);
+}
+
+static void newconn(blast *b);
+
+static void retry(struct timeval *tv, void *p)
+{
+ blast *b = p;
+ newconn(b);
+}
+
+static void backoff(blast *b)
+{
+ struct timeval tv;
+ unsigned r = rand();
+ double q = RAND_MAX / 5;
+ gettimeofday(&tv, 0);
+ TV_ADDL(&tv, &tv, r / q, (r % (unsigned)q) * (MILLION / q));
+ sel_addtimer(&sel, &b->t, &tv, retry, b);
+}
+
+static void connected(int fd, void *p)
+{
+ blast *b = p;
+ sel_rmtimer(&b->t);
+ if (fd == -1)
+ backoff(b);
+ else {
+ count++;
+ close(fd);
+ newconn(b);
+ }
+}
+
+static void timeout(struct timeval *tv, void *p)
+{
+ blast *b = p;
+ conn_kill(&b->c);
+ newconn(b);
+}
+
+static void timers(void)
+{
+ struct tab { void (*func)(struct timeval *tv, void *p); const char *name; }
+ tab[] = { { retry, "retry" }, {timeout, "timeout"}, { stats, "stats" }, { 0,
+ 0 }};
+ sel_timer *t = sel.timers;
+ while (t) {
+ struct tab *q; for (q = tab; q->func != t->func; q++) ;
+ assert(t->prev->next == t);
+ printf("%i.%06i %p %s\n", t->tv.tv_sec, t->tv.tv_usec, t->p, q->name);
+ assert(t != t->next);
+ t = t->next;
+ }
+ puts("");
+}
+
+static void newconn(blast *b)
+{
+ int fd = socket(PF_INET, SOCK_STREAM, 0);
+ struct timeval tv;
+ if (fd < 0)
+ goto fail;
+ gettimeofday(&tv, 0);
+ TV_ADD(&tv, &tv, &ctv);
+ sel_addtimer(&sel, &b->t, &tv, timeout, b);
+ conn_init(&b->c, &sel, fd, (struct sockaddr *)&sin, sizeof(sin),
+ connected, b);
+ return;
+
+fail:
+ backoff(b);
+}
+
+int main(int argc, char *argv[])
+{
+ blast *b;
+ size_t n = 256;
+
+ ego(argv[0]);
+
+ for (;;) {
+ int i = getopt(argc, argv, "t:n:");
+ if (i < 0)
+ break;
+ switch (i) {
+ case 't': {
+ double t = strtod(optarg, 0);
+ double s = modf(t, &t);
+ ctv.tv_sec = t;
+ ctv.tv_usec = s * MILLION;
+ } break;
+ case 'n':
+ n = atoi(optarg);
+ break;
+ default:
+ exit(1);
+ }
+ }
+
+ argv += optind;
+ argc -= optind;
+ if (argc != 2) {
+ pquis(stderr, "Usage: $ [-t time] [-n count] host port\n");
+ exit(1);
+ }
+
+ sel_init(&sel);
+ sin.sin_family = AF_INET;
+
+ {
+ struct hostent *h = gethostbyname(argv[0]);
+ if (!h)
+ die(1, "bad hostname `%s'", argv[0]);
+ memcpy(&sin.sin_addr, h->h_addr, sizeof(struct in_addr));
+ }
+
+ if (isdigit((unsigned char)argv[1][0]))
+ sin.sin_port = htons(atoi(argv[1]));
+ else {
+ struct servent *s = getservbyname(argv[1], "tcp");
+ if (!s)
+ die(1, "bad service name `%s'", argv[1]);
+ sin.sin_port = s->s_port;
+ }
+
+ b = xmalloc(n * sizeof(blast));
+
+ {
+ int i;
+ for (i = 0; i < n; i++)
+ newconn(&b[i]);
+ }
+
+ {
+ struct timeval tv;
+ gettimeofday(&tv, 0);
+ tv.tv_sec++;
+ sel_addtimer(&sel, &sec, &tv, stats, 0);
+ }
+
+ for (;;) {
+ sel_select(&sel);
+ }
+}