int start_fork_tramp(void *thread_arg, unsigned long temp_stack,
int clone_flags, int (*tramp)(void *))
{
struct tramp arg;
unsigned long sp;
int new_pid, status, err;
/* The trampoline will run on the temporary stack */
sp = stack_sp(temp_stack);
clone_flags |= CLONE_FILES | SIGCHLD;
arg.tramp = tramp;
arg.tramp_data = thread_arg;
arg.temp_stack = temp_stack;
arg.flags = clone_flags;
/* Start the process and wait for it to kill itself */
new_pid = clone(outer_tramp, (void *) sp, clone_flags, &arg);
if(new_pid < 0)
return(new_pid);
CATCH_EINTR(err = waitpid(new_pid, &status, 0));
if(err < 0)
panic("Waiting for outer trampoline failed - errno = %d",
errno);
if(!WIFSIGNALED(status) || (WTERMSIG(status) != SIGKILL))
panic("outer trampoline didn't exit with SIGKILL, "
"status = %d", status);
return(arg.pid);
}
static void handle_trap(int pid, union uml_pt_regs *regs)
{
int err, syscall_nr, status;
syscall_nr = PT_SYSCALL_NR(regs->skas.regs);
UPT_SYSCALL_NR(regs) = syscall_nr;
if(syscall_nr < 1){
relay_signal(SIGTRAP, regs);
return;
}
err = ptrace(PTRACE_POKEUSER, pid, PT_SYSCALL_NR_OFFSET, __NR_getpid);
if(err < 0)
panic("handle_trap - nullifying syscall failed errno = %d\n",
errno);
err = ptrace(PTRACE_SYSCALL, pid, 0, 0);
if(err < 0)
panic("handle_trap - continuing to end of syscall failed, "
"errno = %d\n", errno);
CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED));
if((err < 0) || !WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP))
panic("handle_trap - failed to wait at end of syscall, "
"errno = %d, status = %d\n", errno, status);
handle_syscall(regs);
}
void os_kill_process(int pid, int reap_child)
{
kill(pid, SIGKILL);
if(reap_child)
CATCH_EINTR(waitpid(pid, NULL, 0));
}
static void slirp_close(int fd, void *data)
{
struct slirp_data *pri = data;
int status,err;
os_close_file(fd);
os_close_file(pri->slave);
pri->slave = -1;
if(pri->pid<1) {
printk("slirp_close: no child process to shut down\n");
return;
}
#if 0
if(kill(pri->pid, SIGHUP)<0) {
printk("slirp_close: sending hangup to %d failed (%d)\n",
pri->pid, errno);
}
#endif
CATCH_EINTR(err = waitpid(pri->pid, &status, WNOHANG));
if(err < 0) {
printk("slirp_close: waitpid returned %d\n", errno);
return;
}
if(err == 0) {
printk("slirp_close: process %d has not exited\n", pri->pid);
return;
}
pri->pid = -1;
}
unsigned long os_process_pc(int pid)
{
char proc_stat[STAT_PATH_LEN], buf[256];
unsigned long pc = ARBITRARY_ADDR;
int fd, err;
sprintf(proc_stat, "/proc/%d/stat", pid);
fd = open(proc_stat, O_RDONLY, 0);
if (fd < 0) {
printk(UM_KERN_ERR "os_process_pc - couldn't open '%s', "
"errno = %d\n", proc_stat, errno);
goto out;
}
CATCH_EINTR(err = read(fd, buf, sizeof(buf)));
if (err < 0) {
printk(UM_KERN_ERR "os_process_pc - couldn't read '%s', "
"err = %d\n", proc_stat, errno);
goto out_close;
}
os_close_file(fd);
pc = ARBITRARY_ADDR;
if (sscanf(buf, "%*d " COMM_SCANF " %*c %*d %*d %*d %*d %*d %*d %*d "
"%*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d "
"%*d %*d %*d %*d %*d %lu", &pc) != 1)
printk(UM_KERN_ERR "os_process_pc - couldn't find pc in '%s'\n",
buf);
out_close:
close(fd);
out:
return pc;
}
int os_process_parent(int pid)
{
char stat[STAT_PATH_LEN];
char data[256];
int parent, n, fd;
if(pid == -1)
return -1;
snprintf(stat, sizeof(stat), "/proc/%d/stat", pid);
fd = os_open_file(stat, of_read(OPENFLAGS()), 0);
if(fd < 0){
printk("Couldn't open '%s', err = %d\n", stat, -fd);
return FAILURE_PID;
}
CATCH_EINTR(n = read(fd, data, sizeof(data)));
os_close_file(fd);
if(n < 0){
printk("Couldn't read '%s', err = %d\n", stat, errno);
return FAILURE_PID;
}
parent = FAILURE_PID;
n = sscanf(data, "%*d " COMM_SCANF " %*c %d", &parent);
if(n != 1)
printk("Failed to scan '%s'\n", data);
return parent;
}
unsigned long os_process_pc(int pid)
{
char proc_stat[STAT_PATH_LEN], buf[256];
unsigned long pc;
int fd, err;
sprintf(proc_stat, "/proc/%d/stat", pid);
fd = os_open_file(proc_stat, of_read(OPENFLAGS()), 0);
if(fd < 0){
printk("os_process_pc - couldn't open '%s', err = %d\n",
proc_stat, -fd);
return ARBITRARY_ADDR;
}
CATCH_EINTR(err = read(fd, buf, sizeof(buf)));
if(err < 0){
printk("os_process_pc - couldn't read '%s', err = %d\n",
proc_stat, errno);
os_close_file(fd);
return ARBITRARY_ADDR;
}
os_close_file(fd);
pc = ARBITRARY_ADDR;
if(sscanf(buf, "%*d " COMM_SCANF " %*c %*d %*d %*d %*d %*d %*d %*d "
"%*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d "
"%*d %*d %*d %*d %*d %lu", &pc) != 1){
printk("os_process_pc - couldn't find pc in '%s'\n", buf);
}
return pc;
}
int os_process_parent(int pid)
{
char stat[STAT_PATH_LEN];
char data[256];
int parent = FAILURE_PID, n, fd;
if (pid == -1)
return parent;
snprintf(stat, sizeof(stat), "/proc/%d/stat", pid);
fd = open(stat, O_RDONLY, 0);
if (fd < 0) {
printk(UM_KERN_ERR "Couldn't open '%s', errno = %d\n", stat,
errno);
return parent;
}
CATCH_EINTR(n = read(fd, data, sizeof(data)));
close(fd);
if (n < 0) {
printk(UM_KERN_ERR "Couldn't read '%s', errno = %d\n", stat,
errno);
return parent;
}
parent = FAILURE_PID;
n = sscanf(data, "%*d " COMM_SCANF " %*c %d", &parent);
if (n != 1)
printk(UM_KERN_ERR "Failed to scan '%s'\n", data);
return parent;
}
int run_helper_thread(int (*proc)(void *), void *arg, unsigned int flags,
unsigned long *stack_out, int stack_order)
{
unsigned long stack, sp;
int pid, status;
stack = alloc_stack(stack_order, um_in_interrupt());
if(stack == 0) return(-ENOMEM);
sp = stack + (page_size() << stack_order) - sizeof(void *);
pid = clone(proc, (void *) sp, flags | SIGCHLD, arg);
if(pid < 0){
printk("run_helper_thread : clone failed, errno = %d\n",
errno);
return(-errno);
}
if(stack_out == NULL){
CATCH_EINTR(pid = waitpid(pid, &status, 0));
if(pid < 0){
printk("run_helper_thread - wait failed, errno = %d\n",
errno);
pid = -errno;
}
if(!WIFEXITED(status) || (WEXITSTATUS(status) != 0))
printk("run_helper_thread - thread returned status "
"0x%x\n", status);
free_stack(stack, stack_order);
}
else *stack_out = stack;
return(pid);
}
void start_userspace(int cpu)
{
void *stack;
unsigned long sp;
int pid, status, n;
stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if(stack == MAP_FAILED)
panic("start_userspace : mmap failed, errno = %d", errno);
sp = (unsigned long) stack + PAGE_SIZE - sizeof(void *);
pid = clone(userspace_tramp, (void *) sp,
CLONE_FILES | CLONE_VM | SIGCHLD, NULL);
if(pid < 0)
panic("start_userspace : clone failed, errno = %d", errno);
do {
CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
if(n < 0)
panic("start_userspace : wait failed, errno = %d",
errno);
} while(WIFSTOPPED(status) && (WSTOPSIG(status) == SIGVTALRM));
if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP))
panic("start_userspace : expected SIGSTOP, got status = %d",
status);
if(munmap(stack, PAGE_SIZE) < 0)
panic("start_userspace : munmap failed, errno = %d\n", errno);
userspace_pid[cpu] = pid;
}
int run_helper_thread(int (*proc)(void *), void *arg, unsigned int flags,
unsigned long *stack_out)
{
unsigned long stack, sp;
int pid, status, err;
stack = alloc_stack(0, __cant_sleep());
if (stack == 0)
return -ENOMEM;
sp = stack + UM_KERN_PAGE_SIZE - sizeof(void *);
pid = clone(proc, (void *) sp, flags, arg);
if (pid < 0) {
err = -errno;
printk(UM_KERN_ERR "run_helper_thread : clone failed, "
"errno = %d\n", errno);
return err;
}
if (stack_out == NULL) {
CATCH_EINTR(pid = waitpid(pid, &status, __WCLONE));
if (pid < 0) {
err = -errno;
printk(UM_KERN_ERR "run_helper_thread - wait failed, "
"errno = %d\n", errno);
pid = err;
}
if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0))
printk(UM_KERN_ERR "run_helper_thread - thread "
"returned status 0x%x\n", status);
free_stack(stack, 0);
} else
*stack_out = stack;
return pid;
}
/* When testing for SYSEMU support, if it is one of the broken versions, we must
* just avoid using sysemu, not panic, but only if SYSEMU features are broken.
* So only for SYSEMU features we test mustpanic, while normal host features
* must work anyway!*/
static int stop_ptraced_child(int pid, void *stack, int exitcode, int mustpanic)
{
int status, n, ret = 0;
if(ptrace(PTRACE_CONT, pid, 0, 0) < 0)
panic("check_ptrace : ptrace failed, errno = %d", errno);
CATCH_EINTR(n = waitpid(pid, &status, 0));
if(!WIFEXITED(status) || (WEXITSTATUS(status) != exitcode)) {
int exit_with = WEXITSTATUS(status);
if (exit_with == 2)
printk("check_ptrace : child exited with status 2. "
"Serious trouble happening! Try updating your "
"host skas patch!\nDisabling SYSEMU support.");
printk("check_ptrace : child exited with exitcode %d, while "
"expecting %d; status 0x%x", exit_with,
exitcode, status);
if (mustpanic)
panic("\n");
else
printk("\n");
ret = -1;
}
if(munmap(stack, PAGE_SIZE) < 0)
panic("check_ptrace : munmap failed, errno = %d", errno);
return ret;
}
void do_exec(int old_pid, int new_pid)
{
unsigned long regs[FRAME_SIZE];
int err;
if((ptrace(PTRACE_ATTACH, new_pid, 0, 0) < 0) ||
(ptrace(PTRACE_CONT, new_pid, 0, 0) < 0))
tracer_panic("do_exec failed to attach proc - errno = %d",
errno);
CATCH_EINTR(err = waitpid(new_pid, 0, WUNTRACED));
if (err < 0)
tracer_panic("do_exec failed to attach proc in waitpid - errno = %d",
errno);
if(ptrace_getregs(old_pid, regs) < 0)
tracer_panic("do_exec failed to get registers - errno = %d",
errno);
kill(old_pid, SIGKILL);
if(ptrace_setregs(new_pid, regs) < 0)
tracer_panic("do_exec failed to start new proc - errno = %d",
errno);
}
static void etap_change(int op, unsigned char *addr, unsigned char *netmask,
int fd)
{
struct addr_change change;
char *output;
int n;
change.what = op;
memcpy(change.addr, addr, sizeof(change.addr));
memcpy(change.netmask, netmask, sizeof(change.netmask));
CATCH_EINTR(n = write(fd, &change, sizeof(change)));
if (n != sizeof(change)) {
printk(UM_KERN_ERR "etap_change - request failed, err = %d\n",
errno);
return;
}
output = uml_kmalloc(UM_KERN_PAGE_SIZE, UM_GFP_KERNEL);
if (output == NULL)
printk(UM_KERN_ERR "etap_change : Failed to allocate output "
"buffer\n");
read_output(fd, output, UM_KERN_PAGE_SIZE);
if (output != NULL) {
printk("%s", output);
kfree(output);
}
}
void __init check_ptrace(void)
{
void *stack;
int pid, syscall, n, status;
printk("Checking that ptrace can change system call numbers...");
pid = start_ptraced_child(&stack);
while(1){
if(ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0)
panic("check_ptrace : ptrace failed, errno = %d",
errno);
CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
if(n < 0)
panic("check_ptrace : wait failed, errno = %d", errno);
if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP))
panic("check_ptrace : expected SIGTRAP, "
"got status = %d", status);
syscall = ptrace(PTRACE_PEEKUSER, pid, PT_SYSCALL_NR_OFFSET,
0);
if(syscall == __NR_getpid){
n = ptrace(PTRACE_POKEUSER, pid, PT_SYSCALL_NR_OFFSET,
__NR_getppid);
if(n < 0)
panic("check_ptrace : failed to modify system "
"call, errno = %d", errno);
break;
}
}
stop_ptraced_child(pid, stack, 0, 1);
printk("OK\n");
check_sysemu();
}
/*To use the same value of using_sysemu as the caller, ask it that value (in local_using_sysemu)*/
static void handle_trap(int pid, union uml_pt_regs *regs, int local_using_sysemu)
{
int err, status;
/* Mark this as a syscall */
UPT_SYSCALL_NR(regs) = PT_SYSCALL_NR(regs->skas.regs);
if (!local_using_sysemu)
{
err = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET, __NR_getpid);
if(err < 0)
panic("handle_trap - nullifying syscall failed errno = %d\n",
errno);
err = ptrace(PTRACE_SYSCALL, pid, 0, 0);
if(err < 0)
panic("handle_trap - continuing to end of syscall failed, "
"errno = %d\n", errno);
CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED));
if((err < 0) || !WIFSTOPPED(status) ||
(WSTOPSIG(status) != SIGTRAP + 0x80))
panic("handle_trap - failed to wait at end of syscall, "
"errno = %d, status = %d\n", errno, status);
}
handle_syscall(regs);
}
void do_exec(int old_pid, int new_pid)
{
unsigned long regs[FRAME_SIZE];
int err;
if((ptrace(PTRACE_ATTACH, new_pid, 0, 0) < 0) ||
(ptrace(PTRACE_CONT, new_pid, 0, 0) < 0))
tracer_panic("do_exec failed to attach proc - errno = %d",
errno);
CATCH_EINTR(err = waitpid(new_pid, 0, WUNTRACED));
if (err < 0)
tracer_panic("do_exec failed to attach proc in waitpid - errno = %d",
errno);
if(ptrace_getregs(old_pid, regs) < 0)
tracer_panic("do_exec failed to get registers - errno = %d",
errno);
os_kill_ptraced_process(old_pid, 0);
if (ptrace(PTRACE_OLDSETOPTIONS, new_pid, 0, (void *)PTRACE_O_TRACESYSGOOD) < 0)
tracer_panic("do_exec: PTRACE_SETOPTIONS failed, errno = %d", errno);
if(ptrace_setregs(new_pid, regs) < 0)
tracer_panic("do_exec failed to start new proc - errno = %d",
errno);
}
void os_kill_ptraced_process(int pid, int reap_child)
{
kill(pid, SIGKILL);
ptrace(PTRACE_KILL, pid);
ptrace(PTRACE_CONT, pid);
if (reap_child)
CATCH_EINTR(waitpid(pid, NULL, __WALL));
}
void userspace(union uml_pt_regs *regs)
{
int err, status, op, pid = userspace_pid[0];
int local_using_sysemu; /*To prevent races if using_sysemu changes under us.*/
while(1){
restore_registers(pid, regs);
/* Now we set local_using_sysemu to be used for one loop */
local_using_sysemu = get_using_sysemu();
op = SELECT_PTRACE_OPERATION(local_using_sysemu, singlestepping(NULL));
err = ptrace(op, pid, 0, 0);
if(err)
panic("userspace - could not resume userspace process, "
"pid=%d, ptrace operation = %d, errno = %d\n",
op, errno);
CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED));
if(err < 0)
panic("userspace - waitpid failed, errno = %d\n",
errno);
regs->skas.is_user = 1;
save_registers(pid, regs);
UPT_SYSCALL_NR(regs) = -1; /* Assume: It's not a syscall */
if(WIFSTOPPED(status)){
switch(WSTOPSIG(status)){
case SIGSEGV:
handle_segv(pid, regs);
break;
case SIGTRAP + 0x80:
handle_trap(pid, regs, local_using_sysemu);
break;
case SIGTRAP:
relay_signal(SIGTRAP, regs);
break;
case SIGIO:
case SIGVTALRM:
case SIGILL:
case SIGBUS:
case SIGFPE:
case SIGWINCH:
user_signal(WSTOPSIG(status), regs, pid);
break;
default:
printk("userspace - child stopped with signal "
"%d\n", WSTOPSIG(status));
}
interrupt_end();
/* Avoid -ERESTARTSYS handling in host */
PT_SYSCALL_NR(regs->skas.regs) = -1;
}
}
}
int raw(int fd)
{
struct termios tt;
int err;
CATCH_EINTR(err = tcgetattr(fd, &tt));
if(err < 0)
return -errno;
cfmakeraw(&tt);
CATCH_EINTR(err = tcsetattr(fd, TCSADRAIN, &tt));
if(err < 0)
return -errno;
/* XXX tcsetattr could have applied only some changes
* (and cfmakeraw() is a set of changes) */
return 0;
}
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;
}
int helper_wait(int pid, int block)
{
int ret;
CATCH_EINTR(ret = waitpid(pid, NULL, WNOHANG));
if(ret < 0){
printk("helper_wait : waitpid failed, errno = %d\n", errno);
return(-errno);
}
return(ret);
}
void userspace(union uml_pt_regs *regs)
{
int err, status, op, pid = userspace_pid[0];
restore_registers(regs);
err = ptrace(PTRACE_SYSCALL, pid, 0, 0);
if(err)
panic("userspace - PTRACE_SYSCALL failed, errno = %d\n",
errno);
while(1){
CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED));
if(err < 0)
panic("userspace - waitpid failed, errno = %d\n",
errno);
regs->skas.is_user = 1;
save_registers(regs);
if(WIFSTOPPED(status)){
switch(WSTOPSIG(status)){
case SIGSEGV:
handle_segv(pid);
break;
case SIGTRAP:
handle_trap(pid, regs);
break;
case SIGIO:
case SIGVTALRM:
case SIGILL:
case SIGBUS:
case SIGFPE:
case SIGWINCH:
user_signal(WSTOPSIG(status), regs);
break;
default:
printk("userspace - child stopped with signal "
"%d\n", WSTOPSIG(status));
}
interrupt_end();
}
restore_registers(regs);
op = singlestepping_skas() ? PTRACE_SINGLESTEP :
PTRACE_SYSCALL;
err = ptrace(op, pid, 0, 0);
if(err)
panic("userspace - PTRACE_SYSCALL failed, "
"errno = %d\n", errno);
}
}
void kill_child_dead(int pid)
{
kill(pid, SIGKILL);
kill(pid, SIGCONT);
do {
int n;
CATCH_EINTR(n = waitpid(pid, NULL, 0));
if (n > 0)
kill(pid, SIGCONT);
else
break;
} while(1);
}
int net_recvfrom(int fd, void *buf, int len)
{
int n;
CATCH_EINTR(n = recvfrom(fd, buf, len, 0, NULL, NULL));
if (n < 0) {
if (errno == EAGAIN)
return 0;
return -errno;
}
else if (n == 0)
return -ENOTCONN;
return n;
}
int net_send(int fd, void *buf, int len)
{
int n;
CATCH_EINTR(n = send(fd, buf, len, 0));
if (n < 0) {
if (errno == EAGAIN)
return 0;
return -errno;
}
else if (n == 0)
return -ENOTCONN;
return n;
}
static int helper_child(void *arg)
{
struct helper_data *data = arg;
char **argv = data->argv;
int err, ret;
if (data->pre_exec != NULL)
(*data->pre_exec)(data->pre_data);
err = execvp_noalloc(data->buf, argv[0], argv);
/* If the exec succeeds, we don't get here */
CATCH_EINTR(ret = write(data->fd, &err, sizeof(err)));
return 0;
}
int net_sendto(int fd, void *buf, int len, void *to, int sock_len)
{
int n;
CATCH_EINTR(n = sendto(fd, buf, len, 0, (struct sockaddr *) to,
sock_len));
if (n < 0) {
if (errno == EAGAIN)
return 0;
return -errno;
}
else if (n == 0)
return -ENOTCONN;
return n;
}
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, status, 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, NULL);
if(pid < 0) err = pid;
os_close_file(data_remote);
os_close_file(control_remote);
n = os_read_file(control_me, &c, sizeof(c));
if(n != sizeof(c)){
printk("etap_tramp : read of status failed, err = %d\n", -n);
return(-EINVAL);
}
if(c != 1){
printk("etap_tramp : uml_net failed\n");
err = -EINVAL;
CATCH_EINTR(n = waitpid(pid, &status, 0));
if(n < 0)
err = -errno;
else if(!WIFEXITED(status) || (WEXITSTATUS(status) != 1))
printk("uml_net didn't exit with status 1\n");
}
return(err);
}
int helper_wait(int pid)
{
int ret, status;
int wflags = __WCLONE;
CATCH_EINTR(ret = waitpid(pid, &status, wflags));
if (ret < 0) {
printk(UM_KERN_ERR "helper_wait : waitpid process %d failed, "
"errno = %d\n", pid, errno);
return -errno;
} else if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
printk(UM_KERN_ERR "helper_wait : process %d exited with "
"status 0x%x\n", pid, status);
return -ECHILD;
} else
return 0;
}
