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/*
This file is part of GNUnet
Copyright (C) 2012 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
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
Affero General Public License for more details.
*/
/**
* @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[0], msg_buf, sizeof (msg_buf));
if (0 > ret)
{
fprintf (stderr, "read failed: %s\n", strerror (errno));
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 (execlp
("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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