Allocate binder devices for waydroid

waydroid_binder.c

#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <linux/android/binder.h>
#include <linux/android/binderfs.h>

int main(int argc, char *argv[])
{
        // Prepare binderfs devices
        struct binderfs_device binder = { 0 };
        struct binderfs_device hwbinder = { 0 };
        struct binderfs_device vndbinder = { 0 };
        memcpy(binder.name, "binder", strlen("binder"));
        memcpy(hwbinder.name, "hwbinder", strlen("hwbinder"));
        memcpy(vndbinder.name, "vndbinder", strlen("vndbinder"));

        // Allocate binderfs devices
        int fd = open("/dev/binderfs/binder-control", O_RDONLY | O_CLOEXEC);
        ioctl(fd, BINDER_CTL_ADD, &binder);
        ioctl(fd, BINDER_CTL_ADD, &hwbinder);
        ioctl(fd, BINDER_CTL_ADD, &vndbinder);
        close(fd);

        // Symlink to dev
        symlink("/dev/binderfs/binder", "/dev/binder");
        symlink("/dev/binderfs/hwbinder", "/dev/hwbinder");
        symlink("/dev/binderfs/vndbinder", "/dev/vndbinder");

        // Make it accessible to normal users
        chmod("/dev/binder",strtol("0777",0,8));
        chmod("/dev/hwbinder",strtol("0777",0,8));
        chmod("/dev/vndbinder",strtol("0777",0,8));

        // all good exit
        exit(EXIT_SUCCESS);
}