'\" te
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.TH USB_PIPE_SET_PRIVATE 9F "Sep 16, 2016"
.SH NAME
usb_pipe_set_private, usb_pipe_get_private \- USB user-defined pipe data-field
facility
.SH SYNOPSIS
.nf
#include <sys/usb/usba.h>

\fBint \fR\fBusb_pipe_set_private\fR(\fBusb_pipe_handle_t\fR \fIpipe_handle\fR, \fBusb_opaque_t\fR \fIdata\fR);
.fi

.LP
.nf
\fB\fR\fBusb_opaque_t usb_pipe_get_private \fR(\fBusb_pipe_handle_t\fR \fIpipe_handle\fR);
.fi

.SH INTERFACE LEVEL
illumos DDI specific (illumos DDI)
.SH PARAMETERS
For \fBusb_pipe_set_private()\fR:
.sp
.ne 2
.na
\fB\fIpipe_handle\fR\fR
.ad
.RS 15n
Pipe handle into which user-defined data is placed.
.RE

.sp
.ne 2
.na
\fB\fIdata\fR\fR
.ad
.RS 15n
Data to store in the pipe handle.
.RE

.sp
.LP
For \fBusb_pipe_get_private()\fR:
.sp
.ne 2
.na
\fB\fIpipe_handle\fR\fR
.ad
.RS 15n
Pipe handle from which user-defined data is retrieved.
.RE

.SH DESCRIPTION
The \fBusb_set_driver_private()\fR function initializes the user-private data
field of the pipe referred to by \fIpipe_handle\fR, using \fIdata\fR. The
user-private data field is  used to store any data the client desires and is
not used in any way by the USBA or OS framework. Client drivers often store
their soft-state here for convenient retrieval by their callback handlers.
.sp
.LP
The \fBusb_get_driver_private()\fR function retrieves the user-private data
stored via \fBusb_set_driver_private()\fR, from the pipe referred to by
\fIpipe_handle\fR.
.SH RETURN VALUES
For \fBusb_pipe_set_private()\fR:
.sp
.ne 2
.na
\fBUSB_SUCCESS\fR
.ad
.RS 20n
Private data has been successfully stored in pipe handle.
.RE

.sp
.ne 2
.na
\fBUSB_INVALID_PIPE\fR
.ad
.RS 20n
\fIpipe_handle\fR argument is \fBNULL\fR or invalid.
.sp
Pipe is closing or closed.
.RE

.sp
.ne 2
.na
\fBUSB_INVALID_PERM\fR
.ad
.RS 20n
The \fIpipe_handle\fR argument refers to the default control pipe.
.RE

.sp
.LP
For \fBusb_pipe_get_private()\fR:
.sp
.LP
On success: usb_opaque_t pointer to data being retrieved.
.sp
.LP
On failure: \fBNULL\fR. Fails if pipe handle is \fBNULL\fR or invalid. Fails if
pipe handle is to a pipe which is closing or closed.
.SH CONTEXT
May be called from user, kernel or interrupt context.
.SH EXAMPLES
.in +2
.nf
    usb_pipe_handle_t pipe;

    /* Some driver defined datatype. */
    xxx_data_t *data = kmem_zalloc(...);

    usb_pipe_set_private(pipe, data);

    ----

    xxx_data_t *xxx_data_ptr = (xxx_data_t *)usb_pipe_get_private(pipe);

.fi
.in -2

.SH ATTRIBUTES
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Architecture	PCI-based systems
_
Interface stability	Committed
.TE

.SH SEE ALSO
.BR attributes (7),
.BR usb_alloc_request (9F),
.BR usb_pipe_xopen (9F)