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// 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;
}
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