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getmtu_linux.h
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getmtu_linux.h
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/*
QArv, a Qt interface to aravis.
Copyright (C) 2012, 2013 Jure Varlec <jure.varlec@ad-vega.si>
Andrej Lajovic <andrej.lajovic@ad-vega.si>
This program 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 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef GETMTU_LINUX_H
#define GETMTU_LINUX_H
namespace QArv
{
#include <QString>
#include "globals.h"
#include <cstring>
extern "C" {
#include <sys/ioctl.h>
#include <net/if.h>
#include <unistd.h>
}
int getMTU(QString ifname) {
struct ifreq req;
auto bytes = ifname.toLatin1();
strcpy(req.ifr_name, bytes.constData());
int sock = socket(PF_INET, SOCK_STREAM, 0);
if (sock == -1) {
qDebug() << "Socket creation error.";
return 0;
}
ioctl(sock, SIOCGIFMTU, &req);
close(sock);
return req.ifr_mtu;
}
}
#endif