Exemple #1
0
void keychord_init()
{
    int fd, ret;

    service_for_each(add_service_keycodes);

    /* nothing to do if no services require keychords */
    if (!keychords)
        return;

    fd = open("/dev/keychord", O_RDWR | O_CLOEXEC);
    if (fd < 0) {
        ERROR("could not open /dev/keychord\n");
        return;
    }

    ret = write(fd, keychords, keychords_length);
    if (ret != keychords_length) {
        ERROR("could not configure /dev/keychord %d: %s\n", ret, strerror(errno));
        close(fd);
        fd = -1;
    }

    free(keychords);
    keychords = 0;

    keychord_fd = fd;
}
Exemple #2
0
static void unmount_and_fsck(const struct mntent *entry)
{
#ifndef UMOUNT_AND_FSCK_IS_UNSAFE
    if (strcmp(entry->mnt_type, "f2fs") && strcmp(entry->mnt_type, "ext4"))
        return;

    /* First, lazily unmount the directory. This unmount request finishes when
     * all processes that open a file or directory in |entry->mnt_dir| exit.
     */
    TEMP_FAILURE_RETRY(umount2(entry->mnt_dir, MNT_DETACH));

    /* Next, kill all processes except init, kthreadd, and kthreadd's
     * children to finish the lazy unmount. Killing all processes here is okay
     * because this callback function is only called right before reboot().
     * It might be cleaner to selectively kill processes that actually use
     * |entry->mnt_dir| rather than killing all, probably by reusing a function
     * like killProcessesWithOpenFiles() in vold/, but the selinux policy does
     * not allow init to scan /proc/<pid> files which the utility function
     * heavily relies on. The policy does not allow the process to execute
     * killall/pkill binaries either. Note that some processes might
     * automatically restart after kill(), but that is not really a problem
     * because |entry->mnt_dir| is no longer visible to such new processes.
     */
    service_for_each(service_stop);
    TEMP_FAILURE_RETRY(kill(-1, SIGKILL));

    int count = 0;
    while (count++ < UNMOUNT_CHECK_TIMES) {
        int fd = TEMP_FAILURE_RETRY(open(entry->mnt_fsname, O_RDONLY | O_EXCL));
        if (fd >= 0) {
            /* |entry->mnt_dir| has sucessfully been unmounted. */
            close(fd);
            break;
        } else if (errno == EBUSY) {
            /* Some processes using |entry->mnt_dir| are still alive. Wait for a
             * while then retry.
             */
            TEMP_FAILURE_RETRY(
                usleep(UNMOUNT_CHECK_MS * 1000 / UNMOUNT_CHECK_TIMES));
            continue;
        } else {
            /* Cannot open the device. Give up. */
            return;
        }
    }

    int st;
    if (!strcmp(entry->mnt_type, "f2fs")) {
        const char *f2fs_argv[] = {
            "/system/bin/fsck.f2fs", "-f", entry->mnt_fsname,
        };
        android_fork_execvp_ext(ARRAY_SIZE(f2fs_argv), (char **)f2fs_argv,
                                &st, true, LOG_KLOG, true, NULL);
    } else if (!strcmp(entry->mnt_type, "ext4")) {
        const char *ext4_argv[] = {
            "/system/bin/e2fsck", "-f", "-y", entry->mnt_fsname,
        };
        android_fork_execvp_ext(ARRAY_SIZE(ext4_argv), (char **)ext4_argv,
                                &st, true, LOG_KLOG, true, NULL);
    }
#endif
}