gistfile1.c

#include <stdio.h>
#include <fcntl.h>
#include <errno.h>

int main(int argc, char* argv[])
{
        int fd;
        int err;
        char buf;

        printf("start!!\n");

        while(1) {
                fd  = open("/sys/power/wait_for_fb_sleep",O_RDONLY,0);
                printf("wait_for_fb_sleep\n");
                do {
                        err = read(fd,&buf,1);
                } while (err < 0 && errno == EINTR);
                close(fd);

                printf("suspend\n");

                fd = open("/sys/power/wait_for_fb_wake",O_RDONLY,0);
                printf("wait_for_fb_wake\n");
                do {
                        err = read(fd, &buf,1);
                } while (err < 0 && errno == EINTR);
                close(fd);
                printf("wakeup\n");
        }

        printf("Over\n");

        return 0;
}