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, prop_array_copyin_size, prop_array_copyin_ioctl,
     prop_array_copyin_ioctl_size, prop_array_copyout,
     prop_array_copyout_ioctl, prop_dictionary_copyin,
     prop_dictionary_copyin_size, prop_dictionary_copyin_ioctl,
     prop_dictionary_copyin_ioctl_size, prop_dictionary_copyout,
     prop_dictionary_copyout_ioctl -- Copy property lists to and from kernel
     space


SYNOPSIS

     #include <prop/proplib.h>

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

     int
     prop_array_copyin_size(const struct plistref *pref, prop_array_t *arrayp,
         size_t lim);

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

     int
     prop_array_copyin_ioctl_size(const struct plistref *pref,
         const u_long cmd, prop_array_t *arrayp, size_t lim);

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

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

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

     int
     prop_dictionary_copyin_size(const struct plistref *pref,
         prop_dictionary_t *dictp, size_t lim);

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

     int
     prop_dictionary_copyin_ioctl_size(const struct plistref *pref,
         const u_long cmd, prop_dictionary_t *dictp, size_t lim);

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

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


DESCRIPTION

     The prop_array_copyin_ioctl, prop_array_copyin_ioctl_size,
     prop_array_copyout_ioctl, prop_dictionary_copyin_ioctl,
     prop_dictionary_copyin_ioctl_size, 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_copyin_size, prop_array_copyout,
     prop_dictionary_copyin, prop_dictionary_copyin_size, and
     prop_dictionary_copyout implement the kernel side of a protocol for copy-
     ing 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.

     The functions prop_array_copyin_size, prop_array_copyin_ioctl_size,
     prop_dictionary_copyin_size, and prop_dictionary_copyin_ioctl_size take
     an explicit limit argument lim while prop_array_copyin,
     prop_array_copyin_ioctl, prop_dictionary_copyin, and
     prop_dictionary_copyin_ioctl have an implicit size limit of 128KB.
     Attempts to transfer objects larger than the limit result in an E2BIG
     return value.


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:

     [E2BIG]            The object being copied is larger than an arbitrarily
                        established limit (currently set to 128Kbytes).

     [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 10.0_STABLE             January 29, 2017             NetBSD 10.0_STABLE