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zx_pager_op_range

NAME

Perform an operation on a range of a pager owned vmo.

SYNOPSIS

#include <zircon/syscalls.h>

zx_status_t zx_pager_op_range(zx_handle_t pager,
                              uint32_t op,
                              zx_handle_t pager_vmo,
                              uint64_t offset,
                              uint64_t length,
                              uint64_t data);

DESCRIPTION

Performs a pager operation, specified by op on pager_vmo in the range [offset, offset + length). The pager_vmo must have previously been created from the pager by zx_pager_create_vmo(). offset and length must be page aligned. data is an optional parameter, if the specified op supports one.

Operations that can be performed, i.e. values op can take:

ZX_PAGER_OP_FAIL - The userspace pager failed to fulfill page requests for pager_vmo in the range [offset, offset + length). data contains the error encountered (a zx_status_t error code) - permitted values are ZX_ERR_IO, ZX_ERR_IO_DATA_INTEGRITY and ZX_ERR_BAD_STATE. This will signal threads that might be waiting on page requests in that range, unblocking them. If the blocked thread was requesting pages through a zx_vmo_read() or a zx_vmo_op_range() with ZX_VMO_OP_COMMIT, the call will fail and the error status (data) will be returned. If the blocked thread was requesting pages through a VMAR mapping, the thread will take a fatal page fault exception.

RIGHTS

pager must be of type ZX_OBJ_TYPE_PAGER.

pager_vmo must be of type ZX_OBJ_TYPE_VMO.

RETURN VALUE

zx_pager_op_range() returns ZX_OK on success, or one of the following error codes on failure.

ERRORS

ZX_ERR_BAD_HANDLE pager or pager_vmo is not a valid handle.

ZX_ERR_WRONG_TYPE pager is not a pager handle, or pager_vmo is not a vmo handle.

ZX_ERR_INVALID_ARGS pager_vmo is not a vmo created from pager, or offset or length is not page aligned, or op is ZX_PAGER_OP_FAIL and data is not one of ZX_ERR_IO, ZX_ERR_IO_DATA_INTEGRITY or ZX_ERR_BAD_STATE.

ZX_ERR_OUT_OF_RANGE The specified range in pager_vmo is invalid.

ZX_ERR_NOT_SUPPORTED op is not supported on the specified range in pager_vmo.

SEE ALSO