coldboot from android tree.

coldboot.c

#include <stdio.h>
#include <dirent.h>
#include <signal.h>
#include <time.h>
#include <errno.h>
#include <fcntl.h>


static void do_coldboot(DIR *d, int lvl)
{
    struct dirent *de;
    int dfd, fd;

    dfd = dirfd(d);

    fd = openat(dfd, "uevent", O_WRONLY);
    if(fd >= 0) {
        write(fd, "add\n", 4);
        close(fd);
    }

    while((de = readdir(d))) {
        DIR *d2;

        if (de->d_name[0] == '.')
            continue;

        if (de->d_type != DT_DIR && lvl > 0)
            continue;

        fd = openat(dfd, de->d_name, O_RDONLY | O_DIRECTORY);
        if(fd < 0)
            continue;

        d2 = fdopendir(fd);
        if(d2 == 0)
            close(fd);
        else {
            do_coldboot(d2, lvl + 1);
            closedir(d2);
        }
    }
}

static void coldboot(const char *path)
{
    DIR *d = opendir(path);
    if(d) {
        do_coldboot(d, 0);
        closedir(d);
    }
}

int main(int argc, char** argv)
{
    printf("coldboot path:%s ...", argv[1]);
    coldboot(argv[1]);
    printf("done!\n");
    return 0;
}