netbsd man page for prop_dictionary_recv_ioctl

PROP_SEND_IOCTL(3)					   BSD 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 propertly 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 communica-
     tion (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 property container object library first appeared in NetBSD 4.0.

BSD
								 January 21, 2008							       BSD