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Added non-exclusive port option #370

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Added non-exclusive port option #370

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2aa74a1
Added non-exclusive port option.
najlkin Mar 13, 2026
d51bc85
Changed cout to cerr for logging the port.
najlkin Mar 13, 2026
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6 changes: 6 additions & 0 deletions CHANGELOG
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,12 @@
https://glvis.org


Version 4.5.1 (development)
===========================

- Added the option ('-no-ex') to run GLVis in non-exclusive setting when the
server starts listening on the next available port instead of aborting.

Version 4.5 released on Feb 6, 2026
===================================

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34 changes: 28 additions & 6 deletions glvis.cpp
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Expand Up @@ -157,7 +157,8 @@ class Session
};

void GLVisServer(int portnum, bool save_stream, bool fix_elem_orient,
bool save_coloring, string plot_caption, bool headless = false)
bool save_coloring, string plot_caption, bool headless = false,
bool exclusive = true)
{
std::vector<Session> current_sessions;
string data_type;
Expand Down Expand Up @@ -200,10 +201,26 @@ void GLVisServer(int portnum, bool save_stream, bool fix_elem_orient,
#endif

const int backlog = 128;
socketserver server(portnum, backlog);
if (server.good())
unique_ptr<socketserver> server;
if (!exclusive)
{
for (;; portnum++)
{
server = make_unique<socketserver>(portnum, backlog);
if (server->good()) { break; }
}
}
else
{
server = make_unique<socketserver>(portnum, backlog);
}
if (server->good())
{
cout << "Waiting for data on port " << portnum << " ..." << endl;
if (!exclusive)
{
cerr << "GLVIS_SERVER_PORT=" << portnum << endl;
}
}
else
{
Expand All @@ -220,7 +237,7 @@ void GLVisServer(int portnum, bool save_stream, bool fix_elem_orient,
isock.reset(secure ? new socketstream(*params) : new socketstream(false));
#endif
vector<unique_ptr<istream>> input_streams;
while (server.accept(*isock) < 0)
while (server->accept(*isock) < 0)
{
#ifdef GLVIS_DEBUG
cout << "GLVis: server.accept(...) failed." << endl;
Expand Down Expand Up @@ -290,7 +307,7 @@ void GLVisServer(int portnum, bool save_stream, bool fix_elem_orient,
break;
}
// read next available socket stream
while (server.accept(*isock) < 0)
while (server->accept(*isock) < 0)
{
#ifdef GLVIS_DEBUG
cout << "GLVis: server.accept(...) failed." << endl;
Expand Down Expand Up @@ -385,6 +402,7 @@ int main (int argc, char *argv[])
const char *font_name = string_default;
int portnum = 19916;
bool persistent = true;
bool exclusive = true;
int multisample = GetMultisample();
double line_width = GetLineWidth();
double ms_line_width = GetLineWidthMS();
Expand Down Expand Up @@ -458,6 +476,9 @@ int main (int argc, char *argv[])
args.AddOption(&persistent, "-pr", "--persistent",
"-no-pr", "--no-persistent",
"Keep server running after all windows are closed.");
args.AddOption(&exclusive, "-ex", "--exclusive",
"-no-ex", "--no-exclusive",
"Exclusively block the given port or take the next available.");
args.AddOption(&secure, "-sec", "--secure-sockets",
"-no-sec", "--standard-sockets",
"Enable or disable GnuTLS secure sockets.");
Expand Down Expand Up @@ -693,7 +714,8 @@ int main (int argc, char *argv[])
std::thread serverThread{GLVisServer, portnum, save_stream,
win.data_state.fix_elem_orient,
win.data_state.save_coloring,
win.plot_caption, win.headless};
win.plot_caption, win.headless,
exclusive};

// Start message loop in main thread
MainThreadLoop(win.headless, persistent);
Expand Down
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