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#include <signal.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <sys/stat.h>
volatile int need_exit = 0;
static __off_t getfile_size(int fd)
{
struct stat st;
int ret;
ret = fstat(fd, &st);
if (ret == -1) {
perror("fstat");
return -1;
}
return st.st_size;
}
static int open_bat0(const char* bat0dir)
{
return open(bat0dir, O_RDONLY);
}
static char* read_bat0(int fd)
{
off_t size = getfile_size(fd);
char *buf = (char*)malloc(size);
memset(buf, '\0', size);
read(fd, buf, size);
return buf;
}
static int close_bat0(int fd)
{
return close(fd);
}
void signal_cb(int signal)
{
need_exit = 1;
}
int main()
{
signal(SIGINT, signal_cb);
while (!need_exit) {
int fd = open_bat0("/sys/class/power_supply/BAT0/capacity");
char* bat0data = read_bat0(fd);
printf("%s\n", bat0data);
free(bat0data);
close_bat0(fd);
sleep(3);
}
}
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