temp_file_write function

temp_file_write.c

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <pthread.h>
#include <sys/file.h>
#include <time.h>

static inline long long get_uptime_ms() {
    struct timespec ts;
    if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0) {
        perror("clock_gettime");
        return -1;
    }
    long long uptime_ms = ts.tv_sec * 1000LL + ts.tv_nsec / 1000000LL;
    return uptime_ms;
}

static inline void temp_file_write(const char *path, const char* data, size_t length) {
    static int fd = -1;
    static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
    pthread_mutex_lock(&mutex);
    if (fd == -1) {
        fd = open(path, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR);
    }
    write(fd, data, length);
    pthread_mutex_unlock(&mutex);
}

#define LOG_PATH "test.log"
#define LOG_DEBUG(fmt, ...) { \
 char buf[2048];                      \
 snprintf(buf, sizeof(buf), "%.3f " fmt "\n", get_uptime_ms()/1000.f, ##__VA_ARGS__); \
 temp_file_write(LOG_PATH, buf, strlen(buf)); \
}

#define LOG_RAW(data, length) { \
 temp_file_write(LOG_PATH, data, length);\
}