prop_copyin_ioctl(9) - NetBSD Manual Pages

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


NAME

     prop_array_copyin_ioctl, prop_array_copyout_ioctl,
     prop_dictionary_copyin_ioctl, prop_dictionary_copyout_ioctl -- Copy prop-
     erty 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_copyout_ioctl(struct plistref *pref, const u_long cmd,
         prop_array_t array);

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

     int
     prop_dictionary_copyout_ioctl(struct plistref *pref, const u_long cmd,
         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 sending property lists to and
     from the kernel using ioctl(2).

     A kernel ioctl 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.


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


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);
     }


SEE ALSO

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


HISTORY

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

NetBSD 5.0.1                   October 25, 2006                   NetBSD 5.0.1