1 files changed, 63 insertions, 0 deletions
diff --git a/src/ui/daemon.c b/src/ui/daemon.c
new file mode 100644
index 0000000..f74713d
--- /dev/null
+++ b/src/ui/daemon.c
@@ -0,0 +1,63 @@
+// Project: Salis
+// Author:  Paul Oliver
+// Email:   contact@pauloliver.dev
+
+/*
+ * Implements a minimal UI for the Salis simulator with minimal output and
+ * interruptible via OS signals. Ideal for running Salis in the background.
+ */
+
+#include <signal.h>
+#include <unistd.h>
+
+volatile bool g_running;
+u64           g_step_block;
+
+void sig_handler(int signo) {
+    switch (signo) {
+    case SIGINT:
+    case SIGTERM:
+        printf("signal received, stopping simulator...\n");
+        g_running = false;
+        break;
+    }
+}
+
+void step_block() {
+    clock_t beg = clock();
+    salis_step(g_step_block - (g_steps % g_step_block));
+    clock_t end = clock();
+
+    if ((end - beg) < (CLOCKS_PER_SEC * 4)) {
+        g_step_block <<= 1;
+    }
+
+    if ((end - beg) >= (CLOCKS_PER_SEC * 2) && g_step_block != 1) {
+        g_step_block >>= 1;
+    }
+
+    printf("simulator running on step '%#lx'\n", g_steps);
+}
+
+int main() {
+#if ACTION == ACT_NEW
+    salis_init();
+#elif ACTION == ACT_LOAD
+    salis_load();
+#endif
+
+    g_running    = true;
+    g_step_block = 1;
+
+    signal(SIGINT,  sig_handler);
+    signal(SIGTERM, sig_handler);
+
+    while (g_running) {
+        step_block();
+    }
+
+    salis_save(SIM_PATH);
+    salis_free();
+
+    return 0;
+}