From bfa39dc4777fef5d3c0ebf9fe54472daf4b8fd5a Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Fri, 16 Nov 2012 15:37:03 +0000
Subject: -receiver hack

---
 src/transport/gnunet-transport-wlan-receiver.c | 113 +++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 src/transport/gnunet-transport-wlan-receiver.c

(limited to 'src/transport/gnunet-transport-wlan-receiver.c')

diff --git a/src/transport/gnunet-transport-wlan-receiver.c b/src/transport/gnunet-transport-wlan-receiver.c
new file mode 100644
index 000000000..22ad2e20d
--- /dev/null
+++ b/src/transport/gnunet-transport-wlan-receiver.c
@@ -0,0 +1,113 @@
+/*
+ This file is part of GNUnet
+ (C) 2012 Christian Grothoff (and other contributing authors)
+
+ GNUnet is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3, or (at your
+ option) any later version.
+
+ GNUnet is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNUnet; see the file COPYING.  If not, write to the
+ Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA.
+ */
+
+/**
+ * @file transport/gnunet-transport-wlan-receiver.c
+ * @brief program to send via WLAN as much as possible (to test physical/theoretical throughput)
+ * @author David Brodski
+ */
+#include "platform.h"
+#include "gnunet_protocols.h"
+#include "plugin_transport_wlan.h"
+
+int
+main (int argc, char *argv[])
+{
+  char msg_buf[65536];
+  unsigned long long count;
+  double bytes_per_s;
+  time_t start;
+  time_t akt;
+  ssize_t ret;
+  pid_t pid;
+  int commpipe[2];              /* This holds the fd for the input & output of the pipe */
+
+  if (2 != argc)
+  {
+    fprintf (stderr,
+             "This program must be started with the interface name as argument.\n");
+    fprintf (stderr,
+             "Usage: %s interface-name\n"
+             "e.g. %s mon0\n",
+	     argv[0], argv[0]);
+    return 1;
+  }
+
+  /* Setup communication pipeline first */
+  if (pipe (commpipe))
+  {
+    fprintf (stderr, 
+	     "Failed to create pipe: %s\n",
+	     STRERROR (errno));
+    exit (1);
+  }
+
+  /* Attempt to fork and check for errors */
+  if ((pid = fork ()) == -1)
+  {
+    fprintf (stderr, "Failed to fork: %s\n", 
+	     STRERROR (errno));    
+    exit (1);
+  }
+
+  if (pid)
+  {
+    /* A positive (non-negative) PID indicates the parent process */
+    if (0 != close (commpipe[1]))        /* Close unused side of pipe (in side) */
+      fprintf (stderr,
+	       "Failed to close fd: %s\n",
+	       strerror (errno));
+    start = time (NULL);
+    count = 0;
+    while (1)
+    {
+      ret = read (commpipe[1], msg_buf, sizeof (msg_buf));
+      if (0 > ret)
+	break;
+      count += ret;
+      akt = time (NULL);
+      if (akt - start > 30)
+      {
+	bytes_per_s = count / (akt - start);
+	bytes_per_s /= 1024;
+	printf ("recv %f kb/s\n", bytes_per_s); 
+	start = akt;
+	count = 0;
+      }
+    }
+  }
+  else
+  {
+    /* A zero PID indicates that this is the child process */
+    (void) close (1);
+    if (-1 == dup2 (commpipe[1], 1))    /* Replace stdin with the in side of the pipe */
+      fprintf (stderr, "dup2 failed: %s\n", strerror (errno));
+    (void) close (commpipe[0]); /* Close unused side of pipe (in side) */
+    /* Replace the child fork with a new process */
+    if (execl
+        ("gnunet-helper-transport-wlan", "gnunet-helper-transport-wlan",
+         argv[1], NULL) == -1)
+    {
+      fprintf (stderr, "Could not start gnunet-helper-transport-wlan!");
+      _exit (1);
+    }
+  }
+  return 0;
+}
-- 
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