prop_dictionary_sendrecv_ioctl(3) - NetBSD Manual Pages

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PROP_SEND_IOCTL(3)      NetBSD Library Functions Manual     PROP_SEND_IOCTL(3)


NAME

     prop_array_send_ioctl, prop_array_recv_ioctl, prop_dictionary_send_ioctl,
     prop_dictionary_recv_ioctl, prop_dictionary_sendrecv_ioctl -- Send and
     receive property lists to and from the kernel using ioctl


SYNOPSIS

     #include <prop/proplib.h>

     int
     prop_array_send_ioctl(prop_array_t array, int fd, unsigned long cmd);

     int
     prop_array_recv_ioctl(int fd, unsigned long cmd, prop_array_t *arrayp);

     int
     prop_dictionary_send_ioctl(prop_dictionary_t dict, int fd,
         unsigned long cmd);

     int
     prop_dictionary_recv_ioctl(int fd, unsigned long cmd,
         prop_dictionary_t *dictp);

     int
     prop_dictionary_sendrecv_ioctl(prop_dictionary_t dict, int fd,
         unsigned long cmd, prop_dictionary_t *dictp);


DESCRIPTION

     The prop_array_send_ioctl(), prop_array_recv_ioctl(),
     prop_dictionary_send_ioctl(), prop_dictionary_recv_ioctl(), and
     prop_dictionary_sendrecv_ioctl() functions implement the user space side
     of a protocol for sending property lists to and from the kernel using
     ioctl(2).


RETURN VALUES

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


EXAMPLES

     The following (simplified) example demonstrates using
     prop_dictionary_send_ioctl() and prop_dictionary_recv_ioctl() in an
     application:

     void
     foo_setprops(prop_dictionary_t dict)
     {
         int fd;

         fd = open("/dev/foo", O_RDWR, 0640);
         if (fd == -1)
             return;

         (void) prop_dictionary_send_ioctl(dict, fd, FOOSETPROPS);

         (void) close(fd);
     }

     prop_dictionary_t
     foo_getprops(void)
     {
         prop_dictionary_t dict;
         int fd;

         fd = open("/dev/foo", O_RDONLY, 0640);
         if (fd == -1)
             return (NULL);

         if (prop_dictionary_recv_ioctl(fd, FOOGETPROPS, &dict) != 0)
             return (NULL);

         (void) close(fd);

         return (dict);
     }

     The prop_dictionary_sendrecv_ioctl() function combines the send and
     receive functionality, allowing for ioctls that require two-way communi-
     cation (for example to specify arguments for the ioctl operation).


ERRORS

     prop_array_send_ioctl() and prop_dictionary_send_ioctl() will fail if:

     [ENOMEM]           Cannot allocate memory

     [ENOTSUP]          Not supported

     prop_array_recv_ioctl() and prop_dictionary_recv_ioctl() will fail if:

     [EIO]              Input/output error

     [ENOTSUP]          Not supported

     In addition to these, ioctl(2) errors may be returned.


SEE ALSO

     prop_array(3), prop_dictionary(3), proplib(3), prop_copyin_ioctl(9)


HISTORY

     The proplib(3) property container object library first appeared in
     NetBSD 4.0.

NetBSD 10.1                    January 21, 2008                    NetBSD 10.1