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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#define _GNU_SOURCE#include <errno.h>#include <fcntl.h>#include <sched.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#include <sys/ioctl.h>#include <sys/mount.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[]){ int fd, ret, saved_errno; struct binderfs_device device = { 0 };
ret = unshare(CLONE_NEWNS); if (ret < 0) { fprintf(stderr, "%s - Failed to unshare mount namespace\n", strerror(errno)); exit(EXIT_FAILURE); }
ret = mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, 0); if (ret < 0) { fprintf(stderr, "%s - Failed to mount / as private\n", strerror(errno)); exit(EXIT_FAILURE); }
ret = mkdir("/dev/binderfs", 0755); if (ret < 0 && errno != EEXIST) { fprintf(stderr, "%s - Failed to create binderfs mountpoint\n", strerror(errno)); exit(EXIT_FAILURE); }
ret = mount(NULL, "/dev/binderfs", "binder", 0, 0); if (ret < 0) { fprintf(stderr, "%s - Failed to mount binderfs\n", strerror(errno)); exit(EXIT_FAILURE); }
memcpy(device.name, "my-binder", strlen("my-binder"));
fd = open("/dev/binderfs/binder-control", O_RDONLY | O_CLOEXEC); if (fd < 0) { fprintf(stderr, "%s - Failed to open binder-control device\n", strerror(errno)); exit(EXIT_FAILURE); }
ret = ioctl(fd, BINDER_CTL_ADD, &device); saved_errno = errno; close(fd); errno = saved_errno; if (ret < 0) { fprintf(stderr, "%s - Failed to allocate new binder device\n", strerror(errno)); exit(EXIT_FAILURE); }
printf("Allocated new binder device with major %d, minor %d, and name %s\n", device.major, device.minor, device.name);
ret = unlink("/dev/binderfs/my-binder"); if (ret < 0) { fprintf(stderr, "%s - Failed to delete binder device\n", strerror(errno)); exit(EXIT_FAILURE); }
/* Cleanup happens when the mount namespace dies. */ exit(EXIT_SUCCESS);}