#include "timer.h" #include <errno.h>#include <stdbool.h>#include <stdio.h>#include <unistd.h> #include "block.h"#include "util.h" static unsigned int compute_tick(const block *const blocks,                                 const unsigned short block_count) {    unsigned int tick = 0;     for (unsigned short i = 0; i < block_count; ++i) {        const block *const block = &blocks[i];        tick = gcd(block->interval, tick);    }     return tick;} static unsigned int compute_reset_value(const block *const blocks,                                        const unsigned short block_count) {    unsigned int reset_value = 1;     for (unsigned short i = 0; i < block_count; ++i) {        const block *const block = &blocks[i];        reset_value = MAX(block->interval, reset_value);    }     return reset_value;} timer timer_new(const block *const blocks, const unsigned short block_count) {    const unsigned int reset_value = compute_reset_value(blocks, block_count);     timer timer = {        .time = reset_value,  // Initial value to execute all blocks.        .tick = compute_tick(blocks, block_count),        .reset_value = reset_value,    };     return timer;} int timer_arm(timer *const timer) {    errno = 0;    (void)alarm(timer->tick);     if (errno != 0) {        (void)fprintf(stderr, "error: could not arm timer\n");        return 1;    }     // Wrap `time` to the interval [1, reset_value].    timer->time = (timer->time + timer->tick) % timer->reset_value;     return 0;} bool timer_must_run_block(const timer *const timer, const block *const block) {    if (timer == NULL || timer->time == timer->reset_value) {        return true;    }     if (block->interval == 0) {        return false;    }     return timer->time % block->interval == 0;}