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QNetworkInterface: prefer SIOCGIFINDEX over if_nametoindex

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On Linux (on a bad system without getifaddrs), the ioctl for
SIOCGIFINDEX should be faster than if_nametoindex. The ioctl on the
already open socket will require one syscall, while if_nametoindex will
require at least one more (to open the socket), probably more.

Change-Id: I7de033f80b0e4431b7f1ffff13f9888bf2044105
Reviewed-by: Richard J. Moore <rich@kde.org>
This commit is contained in:
Thiago Macieira 2015-08-11 15:21:30 -07:00
parent 3bfba054cb
commit 1bf9cb44e2
1 changed files with 6 additions and 1 deletions
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7
src/network/kernel/qnetworkinterface_unix.cpp
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@ -185,9 +185,14 @@ static QNetworkInterfacePrivate *findInterface(int socket, QList<QNetworkInterfa
QNetworkInterfacePrivate *iface = 0;
int ifindex = 0;
#ifndef QT_NO_IPV6IFNAME
#if !defined(QT_NO_IPV6IFNAME) || defined(SIOCGIFINDEX)
// Get the interface index
# ifdef SIOCGIFINDEX
if (qt_safe_ioctl(socket, SIOCGIFINDEX, &req) >= 0)
ifindex = req.ifr_ifindex;
# else
ifindex = if_nametoindex(req.ifr_name);
# endif
// find the interface data
QList<QNetworkInterfacePrivate *>::Iterator if_it = interfaces.begin();