5 files changed, 185 insertions, 0 deletions
diff --git a/archive/breathing-exo-daemon/v4-clean-shm/Makefile b/archive/breathing-exo-daemon/v4-clean-shm/Makefile
new file mode 100644
index 0000000..2fef9cc
--- /dev/null
+++ b/archive/breathing-exo-daemon/v4-clean-shm/Makefile
@@ -0,0 +1,17 @@
+CC      := gcc
+CFLAGS  := -std=c11 -O2 -Wall -Wextra -pedantic -D_GNU_SOURCE
+LDFLAGS := -lm
+TARGET  := breathing.d
+
+SRC     := exo.c
+
+all: $(TARGET)
+
+$(TARGET): $(SRC)
+	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+
+clean:
+	rm -f $(TARGET) *.o
+
+.PHONY: all clean
+
diff --git a/archive/breathing-exo-daemon/v4-clean-shm/breathing.d b/archive/breathing-exo-daemon/v4-clean-shm/breathing.d
new file mode 100644
index 0000000..cc85b67
--- /dev/null
+++ b/archive/breathing-exo-daemon/v4-clean-shm/breathing.d
diff --git a/archive/breathing-exo-daemon/v4-clean-shm/exo.c b/archive/breathing-exo-daemon/v4-clean-shm/exo.c
new file mode 100644
index 0000000..9ab1f24
--- /dev/null
+++ b/archive/breathing-exo-daemon/v4-clean-shm/exo.c
@@ -0,0 +1,158 @@
+// breathing.d (hardened)
+#define _POSIX_C_SOURCE 200809L
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdatomic.h>
+#include <string.h>
+#include <math.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <time.h>
+#include <signal.h>
+#include <errno.h>
+
+#define SHM_NAME "/breathing_color_shm"
+#define MAGIC 0xBEEFCAFEu
+#define VERSION 1u
+
+// ~12–18s full loop as before
+#define STEP_MS 90
+#define STEP_T  0.02
+
+// For your 7950X3D (32 threads), make “stress” mean it:
+#define STRESS_THRESHOLD 16.0
+
+// Sounds (optional)
+#define SOUND_FILE_STRESS "/usr/local/share/sounds/AresEnraged.wav"
+#define SOUND_FILE_NORMAL "/usr/local/share/sounds/ThanatosVent.wav"
+
+// Shared block (16B aligned, seqlock protocol: even seq = stable)
+typedef struct {
+    uint32_t magic;
+    uint32_t version;
+    _Atomic uint32_t seq;
+    char color[8]; // "#RRGGBB" + '\0' guaranteed
+} shm_color_t;
+
+static const double default_colors[][3] = {
+    {1.0, 0.91, 0.40}, // Y
+    {0.95, 0.44, 0.28}, // O
+    {0.24, 0.85, 0.38}, // G
+};
+static const size_t DEFAULT_COLORS = sizeof(default_colors)/sizeof(default_colors[0]);
+
+static const double stress_colors[][3] = {
+    {0.96, 0.00, 0.00},
+    {0.55, 0.00, 0.00},
+    {0.64, 0.00, 0.00},
+    {0.35, 0.00, 0.00},
+};
+static const size_t STRESS_COLORS = sizeof(stress_colors)/sizeof(stress_colors[0]);
+
+static inline double clamp01(double v) {
+    if (isnan(v) || isinf(v)) return 0.0;
+    if (v < 0.0) return 0.0;
+    if (v > 1.0) return 1.0;
+    return v;
+}
+static inline double srgb_to_linear(double v) {
+    v = clamp01(v);
+    return (v <= 0.04045) ? (v / 12.92) : pow((v + 0.055)/1.055, 2.4);
+}
+static inline double linear_to_srgb(double v) {
+    v = clamp01(v);
+    return (v <= 0.0031308) ? (v * 12.92) : (1.055*pow(v, 1.0/2.4) - 0.055);
+}
+static void lerp_color(const double c1[3], const double c2[3], double t, char out[8]) {
+    double lr = srgb_to_linear(c1[0]) + t*(srgb_to_linear(c2[0]) - srgb_to_linear(c1[0]));
+    double lg = srgb_to_linear(c1[1]) + t*(srgb_to_linear(c2[1]) - srgb_to_linear(c1[1]));
+    double lb = srgb_to_linear(c1[2]) + t*(srgb_to_linear(c2[2]) - srgb_to_linear(c1[2]));
+    unsigned r = (unsigned)lround(clamp01(linear_to_srgb(lr))*255.0);
+    unsigned g = (unsigned)lround(clamp01(linear_to_srgb(lg))*255.0);
+    unsigned b = (unsigned)lround(clamp01(linear_to_srgb(lb))*255.0);
+    snprintf(out, 8, "#%02x%02x%02x", r, g, b);
+}
+static double sys_load(void) {
+    double l[3] = {0,0,0};
+    if (getloadavg(l, 1) == 1) return l[0];
+    return 0.0;
+}
+static void play_once(const char *file) {
+    pid_t p = fork();
+    if (p == 0) { // child
+        // Try PipeWire first, then Pulse
+        // execlp("pw-play", "pw-play", file, (char*)NULL); // TRIM: Pulse not installed 
+        execlp("paplay",  "paplay",  file, (char*)NULL);
+        _exit(127);
+    }
+}
+static void sleep_ms(long ms) {
+    struct timespec req = { .tv_sec = ms/1000, .tv_nsec = (ms%1000)*1000000L };
+    while (clock_nanosleep(CLOCK_MONOTONIC, 0, &req, &req) == EINTR) {}
+}
+
+int main(void) {
+    // Don’t accumulate zombies if sound player exits
+    struct sigaction sa = {0};
+    sa.sa_handler = SIG_IGN; sigaction(SIGCHLD, &sa, NULL);
+
+    int fd = shm_open(SHM_NAME, O_CREAT|O_RDWR, 0666);
+    if (fd < 0) { perror("shm_open"); return 1; }
+    if (ftruncate(fd, sizeof(shm_color_t)) != 0) { perror("ftruncate"); return 1; }
+
+    shm_color_t *blk = mmap(NULL, sizeof(shm_color_t), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
+    if (blk == MAP_FAILED) { perror("mmap"); return 1; }
+    close(fd);
+
+    // Initialize header
+    blk->magic = MAGIC;
+    blk->version = VERSION;
+    atomic_store(&blk->seq, 0);
+    memcpy(blk->color, "#9ab5ff", 8);
+
+    size_t idx = 0;
+    double t = 0.0;
+    int stress = 0;
+    int last_stress = -1;
+
+    for (;;) {
+        // mode & palette
+        double load = sys_load();
+        stress = (load > STRESS_THRESHOLD);
+
+        const double (*pal)[3] = stress ? stress_colors : default_colors;
+        size_t n = stress ? STRESS_COLORS : DEFAULT_COLORS;
+
+        // sound on edge only
+        if (stress != last_stress) {
+            play_once(stress ? SOUND_FILE_STRESS : SOUND_FILE_NORMAL);
+            last_stress = stress;
+        }
+
+        // color
+        char hex[8];
+        const double *c1 = pal[idx];
+        const double *c2 = pal[(idx+1)%n];
+        lerp_color(c1, c2, t, hex);
+
+        // seqlock write: odd while writing, even when stable
+        uint32_t s = atomic_load_explicit(&blk->seq, memory_order_relaxed);
+        atomic_store_explicit(&blk->seq, s+1, memory_order_release); // mark write begin
+        memcpy(blk->color, hex, 8);
+        atomic_store_explicit(&blk->seq, s+2, memory_order_release); // mark write end
+
+        // step
+        t += STEP_T;
+        if (t >= 1.0) { t = 0.0; idx = (idx+1)%n; }
+
+        sleep_ms(STEP_MS);
+    }
+
+    // unreachable in simple daemon mode
+    // munmap(blk, sizeof(*blk)); shm_unlink(SHM_NAME);
+    // return 0;
+}
+
diff --git a/archive/breathing-exo-daemon/v4-clean-shm/loadtest.c b/archive/breathing-exo-daemon/v4-clean-shm/loadtest.c
new file mode 100644
index 0000000..8cb3162
--- /dev/null
+++ b/archive/breathing-exo-daemon/v4-clean-shm/loadtest.c
@@ -0,0 +1,10 @@
+#include <stdio.h>
+#include <stdlib.h>
+#define _GNU_SOURCE
+int main() {
+    double l[3];
+    if (getloadavg(l, 3) != -1)
+        printf("load: %.2f %.2f %.2f\n", l[0], l[1], l[2]);
+    return 0;
+}
+
diff --git a/archive/breathing-exo-daemon/v4-clean-shm/test b/archive/breathing-exo-daemon/v4-clean-shm/test
new file mode 100644
index 0000000..501cf97
--- /dev/null
+++ b/archive/breathing-exo-daemon/v4-clean-shm/test