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obtain maximum hostname length via sysconf() in QHostInfo::localHostName()

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Signed-off-by: Ivailo Monev <xakepa10@laimg.moc>
This commit is contained in:
Ivailo Monev 2020-01-15 00:29:19 +00:00
parent 574c3c90fd
commit 606a6b714e
1 changed files with 7 additions and 4 deletions
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11
src/network/kernel/qhostinfo_unix.cpp
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@ -273,10 +273,13 @@ QHostInfo QHostInfoAgent::fromName(const QString &hostName)
QString QHostInfo::localHostName()
{
char hostName[HOST_NAME_MAX];
if (Q_LIKELY(::gethostname(hostName, sizeof(hostName)) == 0)) {
hostName[sizeof(hostName) - 1] = '\0';
return QString::fromLocal8Bit(hostName);
int size_max = sysconf(_SC_HOST_NAME_MAX);
if (size_max == -1)
size_max = _POSIX_HOST_NAME_MAX;
char gethostbuffer[size_max];
if (Q_LIKELY(::gethostname(gethostbuffer, size_max) == 0)) {
gethostbuffer[size_max - 1] = '\0';
return QString::fromLocal8Bit(gethostbuffer);
}
return QString();
}