How webMAN MOD Performs Temperature Monitoring Using the /cpursx.ps3 Web Interface

webMAN MOD reads CPU and RSX temperatures through the /cpursx.ps3 HTTP endpoint by calling the get_cpursx() function, which queries the PS3's thermal sensors directly and returns formatted HTML without requiring external services.

The open-source project aldostools/webman-mod provides PlayStation 3 users with a lightweight web interface for system management. One of its core features is real-time webMAN MOD temperature monitoring, exposed through the dedicated /cpursx.ps3 endpoint that reports CPU and RSX thermal data directly from the hardware sensors.

Reading Hardware Sensors

The get_cpursx Function in cpursx.h

The foundation of temperature monitoring resides in include/cpursx.h. The get_cpursx(char *cpursx) function queries the PS3's thermal subsystem using low-level system calls implemented at lines 25-33.

It invokes get_temperature(0, &t1) to retrieve the CPU temperature and get_temperature(1, &t2) for the RSX (GPU) temperature, then formats the output as a printable string:

static void get_cpursx(char *cpursx)
{
    u8 t1 = 0, t2 = 0;
    get_temperature(0, &t1);          // CPU temperature
    get_temperature(1, &t2);          // RSX temperature
    sprintf(cpursx, "CPU: %i°C | RSX: %i°C", t1, t2);
}

This implementation performs direct hardware register access without kernel extensions or background daemons.

Serving Data via HTTP

The cpursx_tempc Handler

When a browser or client requests /cpursx.ps3 or /cpursx_ps3, the handler defined in include/cmd/cpursx_tempc.h executes. This function calls get_cpursx(), embeds the temperature string into an HTML response, and transmits it with a 200 OK status header at lines 5-22.

The handler also injects JavaScript to update the parent document's temperature label dynamically:

static void cpursx_tempc()
{
    char *cpursx = header, *buffer = param;
    get_cpursx(cpursx);
    _concat2(&sbuffer,
        HTML_REFRESH, "/cpursx_ps3",
        "<script>parent.document.getElementById('lbl_cpursx').innerHTML = \"%s\";</script>",
        cpursx);
    // send HTTP 200 with the generated HTML
}

This creates the complete request-response cycle for webMAN MOD temperature monitoring.

Web Interface Integration

UI Generation with cpu_rsx_stats

The main status page embeds this endpoint through markup generated by cpu_rsx_stats() in include/cpursx.h (lines 607-618). This creates clickable temperature displays linking back to /cpursx.ps3 with optional Fahrenheit conversions:

sprintf(html,
    "<hr><font size=\"42px\">"
    "<b><a class=\"s\" href=\"/cpursx.ps3?up\">"
    "CPU: %i°C %s<br>"
    "RSX: %i°C</a><hr>"
    "<a class=\"s\" href=\"/cpursx.ps3?dn\">"
    "CPU: %i°F %s<br>"
    "RSX: %i°F</a><hr>",
    t1, max_temp1, t2, t1f, max_temp2, t2f);
concat(buffer, html);

Page Embedding via www_page.h

Additionally, include/www/www_page.h (lines 16-19) injects the endpoint via iframe elements for persistent dashboard visibility across the web interface.

Dynamic Fan Control

The /cpursx.ps3 endpoint accepts query strings for real-time thermal management. Appending ?up increases fan speed, ?dn decreases it, ?mode toggles control policies, and ?fan= sets specific percentage values.

The cpu_rsx_stats() function parses these parameters in include/cpursx.h and adjusts the hardware thermal policy before refreshing the temperature display. This allows users to manage cooling directly from the temperature readout page without accessing separate configuration menus.

Summary

• webMAN MOD queries hardware sensors directly using get_temperature() syscalls in include/cpursx.h
• The /cpursx.ps3 endpoint serves formatted temperature data via the HTTP handler in include/cmd/cpursx_tempc.h
• UI integration occurs through cpu_rsx_stats() in the main interface and iframe embeddings in include/www/www_page.h
• Query parameters enable on-the-fly fan speed adjustments without external tools

Frequently Asked Questions

What hardware sensors does /cpursx.ps3 monitor?

The endpoint monitors the Cell Broadband Engine (CPU) and RSX Reality Synthesizer (GPU) temperatures. The system queries these using get_temperature(0, ...) for the CPU and get_temperature(1, ...) for the RSX, as implemented in the get_cpursx() function at lines 25-33 of include/cpursx.h.

Can I adjust fan speed through the /cpursx.ps3 interface?

Yes. The endpoint accepts query parameters including ?up to increase speed, ?dn to decrease, ?mode to toggle between automatic and manual policies, and ?fan= followed by a numeric value to set specific speeds. The cpu_rsx_stats() function processes these commands immediately.

Where is the temperature data formatted in the source code?

The get_cpursx() function in include/cpursx.h (lines 25-33) formats the raw unsigned integer sensor values into the human-readable "CPU: X°C | RSX: Y°C" string displayed in browsers.

Does webMAN MOD require external services for temperature monitoring?

No. The implementation is entirely self-contained in C, reading hardware registers directly through system calls and serving HTTP responses without external dependencies, background services, or network APIs.

{
  "mcpServers": {
    "instagit": {
      "command": "npx",
      "args": ["-y", "instagit@latest"]
    }
  }
}