1 files changed, 64 insertions, 0 deletions
diff --git a/bat0.c b/bat0.c
new file mode 100644
index 0000000..316a29a
--- /dev/null
+++ b/bat0.c
@@ -0,0 +1,64 @@
+#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);
+        }
+}
+\ No newline at end of file