first gload bits

2 files changed, 140 insertions, 0 deletions

diff --git a/gload.c b/gload.c
new file mode 100644
index 0000000..3b8cca3
--- /dev/null
+++ b/gload.c
@@ -0,0 +1,135 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <fcntl.h>
+
+#include <sys/utsname.h>
+
+#include <gtk/gtk.h>
+
+/* ------------------------------------------------------------------------ */
+
+typedef struct gload {
+    GtkWidget *window;
+    GtkWidget *label;
+    GtkWidget *graph;
+} gload;
+
+/* ------------------------------------------------------------------------ */
+
+static int gload_read()
+{
+    char line[80];
+    int file, ret, val, pos;
+    int vals[3] = {0, 0, 0};
+
+    /* read proc file */
+    file = open("/proc/loadavg", O_RDONLY);
+    if (file < 0)
+        return -1;
+    ret = read(file, line, sizeof(line) - 1);
+    if (ret < 0) {
+        close(file);
+        return -1;
+    }
+    line[ret] = 0;
+    close(file);
+
+    /* parse load values */
+    for (val = 0, pos = 0;
+         val < 3 && pos < ret;
+         pos++) {
+        if (line[pos] == ' ') {
+            val++;
+            continue;
+        }
+        if (line[pos] == '.') {
+            continue;
+        }
+        if (line[pos] < '0'  || line[pos] > '9') {
+            return -1;
+        }
+        vals[val] *= 10;
+        vals[val] += line[pos] - '0';
+    }
+    if (val != 3)
+        return -1;
+
+    fprintf(stderr, "%s: %d %d %d\n", __func__,
+            vals[0], vals[1], vals[2]);
+    return 0;
+}
+
+static gboolean gload_draw(GtkWidget *widget, cairo_t *cr, gpointer data)
+{
+//    gload *gl = data;
+    GtkStyleContext *context;
+    guint width, height;
+    GdkRGBA color;
+
+    context = gtk_widget_get_style_context(widget);
+    width = gtk_widget_get_allocated_width(widget);
+    height = gtk_widget_get_allocated_height(widget);
+
+#if 1 /* gtk doc example code */
+    gtk_render_background(context, cr, 0, 0, width, height);
+
+    cairo_arc(cr,
+              width / 2.0, height / 2.0,
+              MIN (width, height) / 2.0,
+              0, 2 * G_PI);
+
+    gtk_style_context_get_color(context,
+                                gtk_style_context_get_state(context),
+                                &color);
+    gdk_cairo_set_source_rgba(cr, &color);
+    cairo_fill(cr);
+#endif
+
+    return FALSE;
+}
+
+static void gload_window_destroy(GtkWidget *widget, gpointer data)
+{
+    gtk_main_quit();
+}
+
+static gload *gload_new(void)
+{
+    struct utsname uts;
+    GtkWidget *vbox;
+    gload *gl = g_new0(gload, 1);
+
+    gl->window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
+    g_signal_connect(G_OBJECT(gl->window), "destroy",
+                     G_CALLBACK(gload_window_destroy), gl);
+
+    vbox = gtk_box_new(GTK_ORIENTATION_VERTICAL, 0);
+    gtk_container_add(GTK_CONTAINER(gl->window), vbox);
+
+    uname(&uts);
+    gl->label = gtk_label_new(uts.nodename);
+    gtk_box_pack_start(GTK_BOX(vbox), gl->label, false, false, 0);
+
+    gl->graph = gtk_drawing_area_new();
+    gtk_widget_set_size_request(gl->graph, 100, 70);
+    g_signal_connect(G_OBJECT(gl->graph), "draw",
+                     G_CALLBACK(gload_draw), gl);
+    gtk_box_pack_start(GTK_BOX(vbox), gl->graph, true, true, 0);
+
+    gtk_widget_show_all(gl->window);
+    return gl;
+}
+
+int main(int argc, char *argv[])
+{
+    gtk_init(&argc, &argv);
+
+    gload_new();
+    gload_read();
+    gtk_main();
+    return 0;
+}
diff --git a/meson.build b/meson.build
index 9d005d1..27d55ed 100644
--- a/meson.build
+++ b/meson.build
@@ -15,3 +15,8 @@ executable('gterm',
 install_man('gterm.1')
 install_data('gterm.desktop',
 	     install_dir : 'share/applications')
+
+executable('gload',
+           sources      : [ 'gload.c' ],
+           dependencies : [ gtk_dep ],
+           install      : true)