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glibc  2.9
Defines | Functions
ioctl.c File Reference
#include <errno.h>
#include <sys/ioctl.h>
#include <hurd.h>
#include <hurd/fd.h>
#include <hurd/signal.h>
#include <stdarg.h>
#include <mach/notify.h>
#include <assert.h>
#include <string.h>
#include <stdint.h>
#include <hurd/ioctl.h>
#include <mach/mig_support.h>
#include <hurd/ioctls.defs>

Go to the source code of this file.

Defines

#define typesize(type)   (1 << (type))
#define msg_align(x)   (((x) + sizeof (mach_msg_type_t) - 1) & ~(sizeof (mach_msg_type_t) - 1))

Functions

int __ioctl (int fd, unsigned long int request,...)

Define Documentation

#define msg_align (   x)    (((x) + sizeof (mach_msg_type_t) - 1) & ~(sizeof (mach_msg_type_t) - 1))
#define typesize (   type)    (1 << (type))

Definition at line 35 of file ioctl.c.


Function Documentation

int __ioctl ( int  fd,
unsigned long int  request,
  ... 
)

Definition at line 41 of file ioctl.c.

{
#ifdef MACH_MSG_TYPE_CHAR
  /* Map individual type fields to Mach IPC types.  */
  static const int mach_types[] =
    { MACH_MSG_TYPE_CHAR, MACH_MSG_TYPE_INTEGER_16, MACH_MSG_TYPE_INTEGER_32,
      MACH_MSG_TYPE_INTEGER_64 };
#define io2mach_type(count, type) \
  ((mach_msg_type_t) { mach_types[type], typesize (type) * 8, count, 1, 0, 0 })
#endif

  /* Extract the type information encoded in the request.  */
  unsigned int type = _IOC_TYPE (request);

  /* Message buffer.  */
#define msg_align(x) \
  (((x) + sizeof (mach_msg_type_t) - 1) & ~(sizeof (mach_msg_type_t) - 1))
  struct
  {
#ifdef MACH_MSG_TYPE_BIT
    union
    {
      mig_reply_header_t header;
      struct
      {
       mach_msg_header_t    Head;
       int                  RetCodeType;
       kern_return_t        RetCode;
      } header_typecheck;
    };
    char data[3 * sizeof (mach_msg_type_t) +
            msg_align (_IOT_COUNT0 (type) * typesize (_IOT_TYPE0 (type))) +
            msg_align (_IOT_COUNT1 (type) * typesize (_IOT_TYPE1 (type))) +
            _IOT_COUNT2 (type) * typesize (_IOT_TYPE2 (type))];
#else  /* Untyped Mach IPC format.  */
    mig_reply_error_t header;
    char data[_IOT_COUNT0 (type) * typesize (_IOT_TYPE0 (type)) +
            _IOT_COUNT1 (type) * typesize (_IOT_TYPE1 (type)) +
            _IOT_COUNT2 (type) * typesize (_IOT_TYPE2 (type))];
    mach_msg_trailer_t trailer;
#endif
  } msg;
  mach_msg_header_t *const m = &msg.header.Head;
  mach_msg_id_t msgid;
  unsigned int reply_size;
#ifdef MACH_MSG_TYPE_BIT
  mach_msg_type_t *t;
#else
  void *p;
#endif

  void *arg;

  error_t err;

  /* Send the RPC already packed up in MSG to IOPORT
     and decode the return value.  */
  error_t send_rpc (io_t ioport)
    {
      error_t err;
#ifdef MACH_MSG_TYPE_BIT
      mach_msg_type_t *t = &msg.header.RetCodeType;
#else
      void *p = &msg.header.RetCode;
#endif

      /* Marshal the request arguments into the message buffer.
        We must redo this work each time we retry the RPC after a SIGTTOU,
        because the reply message containing the EBACKGROUND error code
        clobbers the same message buffer also used for the request.  */

      if (_IOC_INOUT (request) & IOC_IN)
       {
         /* We don't want to advance ARG since it will be used to copy out
             too if IOC_OUT is also set.  */
         void *argptr = arg;

         /* Pack an argument into the message buffer.  */
         void in (unsigned int count, enum __ioctl_datum type)
           {
             if (count > 0)
              {
                const size_t len = count * typesize ((unsigned int) type);
#ifdef MACH_MSG_TYPE_BIT
                void *p = &t[1];
                *t = io2mach_type (count, type);
                p = __mempcpy (p, argptr, len);
                p = (void *) (((uintptr_t) p + sizeof (*t) - 1)
                            & ~(sizeof (*t) - 1));
                t = p;
#else
                p = __mempcpy (p, argptr, len);
#endif
                argptr += len;
              }
           }

         /* Pack the argument data.  */
         in (_IOT_COUNT0 (type), _IOT_TYPE0 (type));
         in (_IOT_COUNT1 (type), _IOT_TYPE1 (type));
         in (_IOT_COUNT2 (type), _IOT_TYPE2 (type));
       }
      else if (_IOC_INOUT (request) == IOC_VOID)
       {
         /* The RPC takes a single integer_t argument.
            Rather than pointing to the value, ARG is the value itself.  */
#ifdef MACH_MSG_TYPE_BIT
         *t++ = io2mach_type (1, _IOTS (integer_t));
         *(integer_t *) t = (integer_t) arg;
         t = (void *) t + sizeof (integer_t);
#else
         *(integer_t *) p = (integer_t) arg;
         p = (void *) p + sizeof (integer_t);
#endif
       }

      memset (m, 0, sizeof *m);    /* Clear unused fields.  */
      m->msgh_size = (
#ifdef MACH_MSG_TYPE_BIT
                    (char *) t
#else
                    (char *) p
#endif
                    - (char *) &msg);
      m->msgh_remote_port = ioport;
      m->msgh_local_port = __mig_get_reply_port ();
      m->msgh_id = msgid;
      m->msgh_bits = MACH_MSGH_BITS (MACH_MSG_TYPE_COPY_SEND,
                                 MACH_MSG_TYPE_MAKE_SEND_ONCE);
      err = _hurd_intr_rpc_mach_msg (m, MACH_SEND_MSG|MACH_RCV_MSG,
                                 m->msgh_size, sizeof (msg),
                                 m->msgh_local_port,
                                 MACH_MSG_TIMEOUT_NONE,
                                 MACH_PORT_NULL);
      switch (err)
       {
       case MACH_MSG_SUCCESS:
         break;
       case MACH_SEND_INVALID_REPLY:
       case MACH_RCV_INVALID_NAME:
         __mig_dealloc_reply_port (m->msgh_local_port);
       default:
         return err;
       }

      if ((m->msgh_bits & MACH_MSGH_BITS_COMPLEX))
       {
         /* Allow no ports or VM.  */
         __mach_msg_destroy (m);
         /* Want to return a different error below for a different msgid.  */
         if (m->msgh_id == msgid + 100)
           return MIG_TYPE_ERROR;
       }

      if (m->msgh_id != msgid + 100)
       return (m->msgh_id == MACH_NOTIFY_SEND_ONCE ?
              MIG_SERVER_DIED : MIG_REPLY_MISMATCH);

      if (m->msgh_size != reply_size &&
         m->msgh_size != sizeof msg.header)
       return MIG_TYPE_ERROR;

#ifdef MACH_MSG_TYPE_BIT
      if (msg.header_typecheck.RetCodeType !=
         ((union { mach_msg_type_t t; int i; })
          { t: io2mach_type (1, _IOTS (msg.header.RetCode)) }).i)
       return MIG_TYPE_ERROR;
#endif
      return msg.header.RetCode;
    }

  va_list ap;

  va_start (ap, request);
  arg = va_arg (ap, void *);
  va_end (ap);

  {
    /* Check for a registered handler for REQUEST.  */
    ioctl_handler_t handler = _hurd_lookup_ioctl_handler (request);
    if (handler)
      {
       /* This handler groks REQUEST.  Se lo puntamonos.  */
       int save = errno;
       int result = (*handler) (fd, request, arg);
       if (result != -1 || errno != ENOTTY)
         return result;

       /* The handler doesn't really grok this one.
          Try the normal RPC translation.  */
       errno = save;
      }
  }

  /* Compute the Mach message ID for the RPC from the group and command
     parts of the ioctl request.  */
  msgid = IOC_MSGID (request);

  /* Compute the expected size of the reply.  There is a standard header
     consisting of the message header and the reply code.  Then, for out
     and in/out ioctls, there come the data with their type headers.  */
  reply_size = sizeof msg.header;

  if (_IOC_INOUT (request) & IOC_OUT)
    {
      inline void figure_reply (unsigned int count, enum __ioctl_datum type)
       {
         if (count > 0)
           {
#ifdef MACH_MSG_TYPE_BIT
             /* Add the size of the type and data.  */
             reply_size += sizeof (mach_msg_type_t) + typesize (type) * count;
             /* Align it to word size.  */
             reply_size += sizeof (mach_msg_type_t) - 1;
             reply_size &= ~(sizeof (mach_msg_type_t) - 1);
#else
             reply_size += typesize (type) * count;
#endif
           }
       }
      figure_reply (_IOT_COUNT0 (type), _IOT_TYPE0 (type));
      figure_reply (_IOT_COUNT1 (type), _IOT_TYPE1 (type));
      figure_reply (_IOT_COUNT2 (type), _IOT_TYPE2 (type));
    }

  /* Marshal the arguments into the request message and make the RPC.
     This wrapper function handles EBACKGROUND returns, turning them
     into either SIGTTOU or EIO.  */
  err = HURD_DPORT_USE (fd, _hurd_ctty_output (port, ctty, send_rpc));

#ifdef MACH_MSG_TYPE_BIT
  t = (mach_msg_type_t *) msg.data;
#else
  p = (void *) msg.data;
#endif
  switch (err)
    {
      /* Unpack the message buffer into the argument location.  */
      int out (unsigned int count, unsigned int type,
              void *store, void **update)
       {
         if (count > 0)
           {
             const size_t len = count * typesize (type);
#ifdef MACH_MSG_TYPE_BIT
             union { mach_msg_type_t t; int i; } ipctype;
             ipctype.t = io2mach_type (count, type);
             if (*(int *) t != ipctype.i)
              return 1;
             ++t;
             memcpy (store, t, len);
             if (update != NULL)
              *update += len;
             t = (void *) (((uintptr_t) t + len + sizeof (*t) - 1)
                         & ~(sizeof (*t) - 1));
#else
             memcpy (store, p, len);
             p += len;
             if (update != NULL)
              *update += len;
#endif
           }
         return 0;
       }

    case 0:
      if (m->msgh_size != reply_size ||
         ((_IOC_INOUT (request) & IOC_OUT) &&
          (out (_IOT_COUNT0 (type), _IOT_TYPE0 (type), arg, &arg) ||
           out (_IOT_COUNT1 (type), _IOT_TYPE1 (type), arg, &arg) ||
           out (_IOT_COUNT2 (type), _IOT_TYPE2 (type), arg, &arg))))
       return __hurd_fail (MIG_TYPE_ERROR);
      return 0;

    case MIG_BAD_ID:
    case EOPNOTSUPP:
      /* The server didn't understand the RPC.  */
      err = ENOTTY;
    default:
      return __hurd_fail (err);
    }
}

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