static int slirp_open(void *data)
{
struct slirp_data *pri = data;
int fds[2], pid, err;
err = os_pipe(fds, 1, 1);
if (err)
return err;
err = slirp_tramp(pri->argw.argv, fds[1]);
if (err < 0) {
printk(UM_KERN_ERR "slirp_tramp failed - errno = %d\n", -err);
goto out;
}
pid = err;
pri->slave = fds[1];
pri->slip.pos = 0;
pri->slip.esc = 0;
pri->pid = err;
return fds[0];
out:
close(fds[0]);
close(fds[1]);
return err;
}
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;
}
int copy_thread_tt(int nr, unsigned long clone_flags, unsigned long sp,
unsigned long stack_top, struct task_struct * p,
struct pt_regs *regs)
{
int (*tramp)(void *);
int new_pid, err;
unsigned long stack;
if(current->thread.forking)
tramp = fork_tramp;
else {
tramp = new_thread_proc;
p->thread.request.u.thread = current->thread.request.u.thread;
}
err = os_pipe(p->thread.mode.tt.switch_pipe, 1, 1);
if(err < 0){
printk("copy_thread : pipe failed, err = %d\n", -err);
return(err);
}
stack = alloc_stack(0, 0);
if(stack == 0){
printk(KERN_ERR "copy_thread : failed to allocate "
"temporary stack\n");
return(-ENOMEM);
}
clone_flags &= CLONE_VM;
p->thread.temp_stack = stack;
new_pid = start_fork_tramp(task_stack_page(p), stack, clone_flags, tramp);
if(new_pid < 0){
printk(KERN_ERR "copy_thread : clone failed - errno = %d\n",
-new_pid);
return(new_pid);
}
if(current->thread.forking){
sc_to_sc(UPT_SC(&p->thread.regs.regs), UPT_SC(®s->regs));
SC_SET_SYSCALL_RETURN(UPT_SC(&p->thread.regs.regs), 0);
if(sp != 0)
SC_SP(UPT_SC(&p->thread.regs.regs)) = sp;
}
p->thread.mode.tt.extern_pid = new_pid;
current->thread.request.op = OP_FORK;
current->thread.request.u.fork.pid = new_pid;
os_usr1_process(os_getpid());
/* Enable the signal and then disable it to ensure that it is handled
* here, and nowhere else.
*/
change_sig(SIGUSR1, 1);
change_sig(SIGUSR1, 0);
err = 0;
return(err);
}
static int etap_open(void *data)
{
struct ethertap_data *pri = data;
char *output;
int data_fds[2], control_fds[2], err, output_len;
err = tap_open_common(pri->dev, pri->gate_addr);
if(err) return(err);
err = os_pipe(data_fds, 0, 0);
if(err < 0){
printk("data os_pipe failed - err = %d\n", -err);
return(err);
}
err = os_pipe(control_fds, 1, 0);
if(err < 0){
printk("control os_pipe failed - err = %d\n", -err);
return(err);
}
err = etap_tramp(pri->dev_name, pri->gate_addr, control_fds[0],
control_fds[1], data_fds[0], data_fds[1]);
output_len = page_size();
output = um_kmalloc(output_len);
read_output(control_fds[0], output, output_len);
if(output == NULL)
printk("etap_open : failed to allocate output buffer\n");
else {
printk("%s", output);
kfree(output);
}
if(err < 0){
printk("etap_tramp failed - err = %d\n", -err);
return(err);
}
pri->data_fd = data_fds[0];
pri->control_fd = control_fds[0];
iter_addresses(pri->dev, etap_open_addr, &pri->control_fd);
return(data_fds[0]);
}
void set_init_pid(int pid)
{
int err;
init_task.thread.mode.tt.extern_pid = pid;
err = os_pipe(init_task.thread.mode.tt.switch_pipe, 1, 1);
if(err)
panic("Can't create switch pipe for init_task, errno = %d",
-err);
}
static int slip_tramp(char **argv, int fd)
{
struct slip_pre_exec_data pe_data;
char *output;
int status, pid, fds[2], err, output_len;
err = os_pipe(fds, 1, 0);
if(err < 0){
printk("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, NULL);
if(err < 0)
goto out_close;
pid = err;
output_len = page_size();
output = um_kmalloc(output_len);
if(output == NULL){
printk("slip_tramp : failed to allocate output buffer\n");
os_kill_process(pid, 1);
err = -ENOMEM;
goto out_free;
}
os_close_file(fds[1]);
read_output(fds[0], output, output_len);
printk("%s", output);
CATCH_EINTR(err = waitpid(pid, &status, 0));
if(err < 0)
err = errno;
else if(!WIFEXITED(status) || (WEXITSTATUS(status) != 0)){
printk("'%s' didn't exit with status 0\n", argv[0]);
err = -EINVAL;
}
else err = 0;
os_close_file(fds[0]);
out_free:
kfree(output);
return err;
out_close:
os_close_file(fds[0]);
os_close_file(fds[1]);
out:
return err;
}
static void setup_tracer_winch(void)
{
int err;
err = os_pipe(tracer_winch, 1, 1);
if(err < 0){
printk("setup_tracer_winch : os_pipe failed, err = %d\n", -err);
return;
}
signal(SIGWINCH, tracer_winch_handler);
}
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 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){
printk("change_tramp - pipe failed, errno = %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, NULL);
close(fds[1]);
read_output(fds[0], output, output_len);
waitpid(pid, NULL, 0);
return(pid);
}
static int idle_proc(void *cpup)
{
int cpu = (int) cpup, err;
err = os_pipe(cpu_data[cpu].ipi_pipe, 1, 1);
if (err < 0)
panic("CPU#%d failed to create IPI pipe, err = %d", cpu, -err);
os_set_fd_async(cpu_data[cpu].ipi_pipe[0]);
wmb();
if (cpu_test_and_set(cpu, cpu_callin_map)) {
printk(KERN_ERR "huh, CPU#%d already present??\n", cpu);
BUG();
}
while (!cpu_isset(cpu, smp_commenced_mask))
cpu_relax();
notify_cpu_starting(cpu);
<<<<<<< HEAD
static int slip_tramp(char **argv, int fd)
{
struct slip_pre_exec_data pe_data;
char *output;
int status, pid, fds[2], err, output_len;
err = os_pipe(fds, 1, 0);
if(err){
printk("slip_tramp : pipe failed, errno = %d\n", -err);
return(err);
}
err = 0;
pe_data.stdin = fd;
pe_data.stdout = fds[1];
pe_data.close_me = fds[0];
pid = run_helper(slip_pre_exec, &pe_data, argv, NULL);
if(pid < 0) err = pid;
else {
output_len = page_size();
output = um_kmalloc(output_len);
if(output == NULL)
printk("slip_tramp : failed to allocate output "
"buffer\n");
close(fds[1]);
read_output(fds[0], output, output_len);
if(output != NULL){
printk("%s", output);
kfree(output);
}
if(waitpid(pid, &status, 0) < 0) err = errno;
else if(!WIFEXITED(status) || (WEXITSTATUS(status) != 0)){
printk("'%s' didn't exit with status 0\n", argv[0]);
err = EINVAL;
}
}
return(err);
}
int start_io_thread(unsigned long sp, int *fd_out)
{
int pid, fds[2], err;
err = os_pipe(fds, 1, 1);
if(err < 0){
printk("start_io_thread - os_pipe failed, err = %d\n", -err);
goto out;
}
kernel_fd = fds[0];
*fd_out = fds[1];
err = os_set_fd_block(*fd_out, 0);
if (err) {
printk("start_io_thread - failed to set nonblocking I/O.\n");
goto out_close;
}
pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM, NULL);
if(pid < 0){
err = -errno;
printk("start_io_thread - clone failed : errno = %d\n", errno);
goto out_close;
}
return(pid);
out_close:
os_close_file(fds[0]);
os_close_file(fds[1]);
kernel_fd = -1;
*fd_out = -1;
out:
return err;
}
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;
}
int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv,
unsigned long *stack_out)
{
struct helper_data data;
unsigned long stack, sp;
int pid, fds[2], err, n;
if((stack_out != NULL) && (*stack_out != 0))
stack = *stack_out;
else stack = alloc_stack(0, um_in_interrupt());
if(stack == 0)
return(-ENOMEM);
err = os_pipe(fds, 1, 0);
if(err < 0){
printk("run_helper : pipe failed, err = %d\n", -err);
goto out_free;
}
err = os_set_exec_close(fds[1], 1);
if(err < 0){
printk("run_helper : setting FD_CLOEXEC failed, err = %d\n",
-err);
goto out_close;
}
sp = stack + page_size() - sizeof(void *);
data.pre_exec = pre_exec;
data.pre_data = pre_data;
data.argv = argv;
data.fd = fds[1];
pid = clone(helper_child, (void *) sp, CLONE_VM | SIGCHLD, &data);
if(pid < 0){
printk("run_helper : clone failed, errno = %d\n", errno);
err = -errno;
goto out_close;
}
os_close_file(fds[1]);
n = os_read_file(fds[0], &err, sizeof(err));
if(n < 0){
printk("run_helper : read on pipe failed, err = %d\n", -n);
err = n;
goto out_kill;
}
else if(n != 0){
CATCH_EINTR(n = waitpid(pid, NULL, 0));
pid = -errno;
}
if(stack_out == NULL) free_stack(stack, 0);
else *stack_out = stack;
return(pid);
out_kill:
os_kill_process(pid, 1);
out_close:
os_close_file(fds[0]);
os_close_file(fds[1]);
out_free:
free_stack(stack, 0);
return(err);
}
