prop_copyin_ioctl(9) - NetBSD Manual Pages

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PROP_COPYIN_IOCTL(9)   NetBSD Kernel Developer's Manual   PROP_COPYIN_IOCTL(9)


NAME

     prop_array_copyin_ioctl, prop_array_copyout_ioctl, prop_array_copyin,
     prop_array_copyout, prop_dictionary_copyin_ioctl,
     prop_dictionary_copyout_ioctl, prop_dictionary_copyin,
     prop_dictionary_copyout -- Copy property lists to and from kernel space


SYNOPSIS

     #include <prop/proplib.h>

     int
     prop_array_copyin_ioctl(const struct plistref *pref, const u_long cmd,
         prop_array_t *arrayp);

     int
     prop_array_copyin(const struct plistref *pref, prop_array_t *arrayp);

     int
     prop_array_copyout_ioctl(struct plistref *pref, const u_long cmd,
         prop_array_t array);

     int
     prop_array_copyout(struct plistref *pref, prop_array_t array);

     int
     prop_dictionary_copyin_ioctl(const struct plistref *pref,
         const u_long cmd, prop_dictionary_t *dictp);

     int
     prop_dictionary_copyin(const struct plistref *pref,
         prop_dictionary_t *dictp);

     int
     prop_dictionary_copyout_ioctl(struct plistref *pref, const u_long cmd,
         prop_dictionary_t dict);

     int
     prop_dictionary_copyout(struct plistref *pref, prop_dictionary_t dict);


DESCRIPTION

     The prop_array_copyin_ioctl, prop_array_copyout_ioctl,
     prop_dictionary_copyin_ioctl, and prop_dictionary_copyout_ioctl functions
     implement the kernel side of a protocol for copying property lists to and
     from the kernel using ioctl(2).  The functions prop_array_copyin,
     prop_array_copyout, prop_dictionary_copyin, and prop_dictionary_copyout
     implement the kernel side of a protocol for copying property lists to the
     kernel as arguments of normal system calls.

     A kernel routine receiving or returning a property list will be passed a
     pointer to a struct plistref.  This structure encapsulates the reference
     to the property list in externalized form.


RETURN VALUES

     If successful, functions return zero.  Otherwise, an error number will be
     returned to indicate the error.


EXAMPLES

     The following (simplified) example demonstrates using
     prop_dictionary_copyin_ioctl() and prop_dictionary_copyout_ioctl() in an
     ioctl routine:

     extern prop_dictionary_t fooprops;

     int
     fooioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct lwp *l)
     {
         prop_dictionary_t dict, odict;
         int error;

         switch (cmd) {
         case FOOSETPROPS: {
             const struct plistref *pref = (const struct plistref *) data;
             error = prop_dictionary_copyin_ioctl(pref, cmd, &dict);
             if (error)
                     return (error);
             odict = fooprops;
             fooprops = dict;
             prop_object_release(odict);
             break;
           }

         case FOOGETPROPS: {
             struct plistref *pref = (struct plistref *) data;
             error = prop_dictionary_copyout_ioctl(pref, cmd, fooprops);
             break;
           }

         default:
             return (EPASSTHROUGH);
         }
         return (error);
     }

     The following (simplified) example demonstrates using prop_array_copyin()
     in a routine:

     int
     foocopyin(const struct plistref *pref))
     {
         prop_array_t array;
         int error;

         error = prop_array_copyin(pref, &array);
         if (error)
                 return (error);
         ...
     }


ERRORS

     prop_array_copyin_ioctl() and prop_dictionary_copyin_ioctl() will fail
     if:

     [EFAULT]           Bad address

     [EIO]              Input/output error

     [ENOMEM]           Cannot allocate memory

     [ENOTSUP]          Not supported

     prop_array_copyout_ioctl() and prop_dictionary_copyout_ioctl() will fail
     if:

     [EFAULT]           Bad address

     [ENOMEM]           Cannot allocate memory

     [ENOTSUP]          Not supported


SEE ALSO

     prop_array(3), prop_dictionary(3), prop_send_ioctl(3),
     prop_send_syscall(3), proplib(3)


HISTORY

     The proplib property container object library first appeared in
     NetBSD 4.0.

NetBSD 6.1.2                   January 17, 2011                   NetBSD 6.1.2