static int change_tramp(char **argv, char *output, int output_len)
{
	int pid, fds[2], err;
	struct change_pre_exec_data pe_data;

	err = os_pipe(fds, 1, 0);
	if (err < 0) {
		printk(UM_KERN_ERR "change_tramp - pipe failed, err = %d\n",
		       -err);
		return err;
	}
	pe_data.close_me = fds[0];
	pe_data.stdout = fds[1];
	pid = run_helper(change_pre_exec, &pe_data, argv);

	if (pid > 0)	/* Avoid hang as we won't get data in failure case. */
		read_output(fds[0], output, output_len);

	close(fds[0]);
	close(fds[1]);

	if (pid > 0)
		helper_wait(pid);
	return pid;
}
Beispiel #2
0
static void slirp_close(int fd, void *data)
{
	struct slirp_data *pri = data;
	int err;

	close(fd);
	close(pri->slave);

	pri->slave = -1;

	if (pri->pid<1) {
		printk(UM_KERN_ERR "slirp_close: no child process to shut "
		       "down\n");
		return;
	}

#if 0
	if (kill(pri->pid, SIGHUP)<0) {
		printk(UM_KERN_ERR "slirp_close: sending hangup to %d failed "
		       "(%d)\n", pri->pid, errno);
	}
#endif
	err = helper_wait(pri->pid);
	if (err < 0)
		return;

	pri->pid = -1;
}
Beispiel #3
0
static int slip_tramp(char **argv, int fd)
{
	struct slip_pre_exec_data pe_data;
	char *output;
	int pid, fds[2], err, output_len;

	err = os_pipe(fds, 1, 0);
	if (err < 0) {
		printk(UM_KERN_ERR "slip_tramp : pipe failed, err = %d\n",
		       -err);
		goto out;
	}

	err = 0;
	pe_data.stdin = fd;
	pe_data.stdout = fds[1];
	pe_data.close_me = fds[0];
	err = run_helper(slip_pre_exec, &pe_data, argv);
	if (err < 0)
		goto out_close;
	pid = err;

	output_len = UM_KERN_PAGE_SIZE;
	output = kmalloc(output_len, UM_GFP_KERNEL);
	if (output == NULL) {
		printk(UM_KERN_ERR "slip_tramp : failed to allocate output "
		       "buffer\n");
		os_kill_process(pid, 1);
		err = -ENOMEM;
		goto out_free;
	}

	close(fds[1]);
	read_output(fds[0], output, output_len);
	printk("%s", output);

	err = helper_wait(pid, 0, argv[0]);
	close(fds[0]);

out_free:
	kfree(output);
	return err;

out_close:
	close(fds[0]);
	close(fds[1]);
out:
	return err;
}
static int etap_tramp(char *dev, char *gate, int control_me,
		      int control_remote, int data_me, int data_remote)
{
	struct etap_pre_exec_data pe_data;
	int pid, err, n;
	char version_buf[sizeof("nnnnn\0")];
	char data_fd_buf[sizeof("nnnnnn\0")];
	char gate_buf[sizeof("nnn.nnn.nnn.nnn\0")];
	char *setup_args[] = { "uml_net", version_buf, "ethertap", dev,
			       data_fd_buf, gate_buf, NULL };
	char *nosetup_args[] = { "uml_net", version_buf, "ethertap",
				 dev, data_fd_buf, NULL };
	char **args, c;

	sprintf(data_fd_buf, "%d", data_remote);
	sprintf(version_buf, "%d", UML_NET_VERSION);
	if (gate != NULL) {
		strcpy(gate_buf, gate);
		args = setup_args;
	}
	else args = nosetup_args;

	err = 0;
	pe_data.control_remote = control_remote;
	pe_data.control_me = control_me;
	pe_data.data_me = data_me;
	pid = run_helper(etap_pre_exec, &pe_data, args);

	if (pid < 0)
		err = pid;
	close(data_remote);
	close(control_remote);
	CATCH_EINTR(n = read(control_me, &c, sizeof(c)));
	if (n != sizeof(c)) {
		err = -errno;
		printk(UM_KERN_ERR "etap_tramp : read of status failed, "
		       "err = %d\n", -err);
		return err;
	}
	if (c != 1) {
		printk(UM_KERN_ERR "etap_tramp : uml_net failed\n");
		err = helper_wait(pid);
	}
	return err;
}
Beispiel #5
0
static void slirp_close(int fd, void *data)
{
	struct slirp_data *pri = data;
	int err;

	close(fd);
	close(pri->slave);

	pri->slave = -1;

	if (pri->pid<1) {
		printk(UM_KERN_ERR "slirp_close: no child process to shut "
		       "down\n");
		return;
	}

	err = helper_wait(pri->pid);
	if (err < 0)
		return;

	pri->pid = -1;
}
int start_watchdog(int *in_fd_ret, int *out_fd_ret, char *sock)
{
	struct dog_data data;
	int in_fds[2], out_fds[2], pid, n, err;
	char pid_buf[sizeof("nnnnn\0")], c;
	char *pid_args[] = { "/usr/bin/uml_watchdog", "-pid", pid_buf, NULL };
	char *mconsole_args[] = { "/usr/bin/uml_watchdog", "-mconsole", NULL,
				  NULL };
	char **args = NULL;

	err = os_pipe(in_fds, 1, 0);
	if (err < 0) {
		printk("harddog_open - os_pipe failed, err = %d\n", -err);
		goto out;
	}

	err = os_pipe(out_fds, 1, 0);
	if (err < 0) {
		printk("harddog_open - os_pipe failed, err = %d\n", -err);
		goto out_close_in;
	}

	data.stdin = out_fds[0];
	data.stdout = in_fds[1];
	data.close_me[0] = out_fds[1];
	data.close_me[1] = in_fds[0];

	if (sock != NULL) {
		mconsole_args[2] = sock;
		args = mconsole_args;
	}
	else {
		/* XXX The os_getpid() is not SMP correct */
		sprintf(pid_buf, "%d", os_getpid());
		args = pid_args;
	}

	pid = run_helper(pre_exec, &data, args);

	close(out_fds[0]);
	close(in_fds[1]);

	if (pid < 0) {
		err = -pid;
		printk("harddog_open - run_helper failed, errno = %d\n", -err);
		goto out_close_out;
	}

	n = read(in_fds[0], &c, sizeof(c));
	if (n == 0) {
		printk("harddog_open - EOF on watchdog pipe\n");
		helper_wait(pid);
		err = -EIO;
		goto out_close_out;
	}
	else if (n < 0) {
		printk("harddog_open - read of watchdog pipe failed, "
		       "err = %d\n", errno);
		helper_wait(pid);
		err = n;
		goto out_close_out;
	}
	*in_fd_ret = in_fds[0];
	*out_fd_ret = out_fds[1];
	return 0;

 out_close_in:
	close(in_fds[0]);
	close(in_fds[1]);
 out_close_out:
	close(out_fds[0]);
	close(out_fds[1]);
 out:
	return err;
}