sample : write - greatcat 的部落格

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sample : write

2020/12/15 16:24:05瀏覽55｜回應0｜推薦0

#include
#include
#include
#include
#include

#define LED_NODE "/sys/class/leds/status0:red:cpu0/brightness"

int main(void){
    int fd,i1;
    char cbuf[20];
    printf("%s\n",LED_NODE);
    fd=open(LED_NODE,O_WRONLY);
    if (fd<0){ br="">        printf("!!! open file err\n");
        return 1;
    }
    i1=snprintf(cbuf,sizeof(cbuf),"1");
    write(fd, cbuf,i1);
    fsync(fd);

    sleep(1);

    i1=snprintf(cbuf,sizeof(cbuf),"0");
    write(fd, cbuf,i1);
    fsync(fd);

    close(fd);

    return 0;
}

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