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rsm_memseg_import_get, rsm_memseg_import_get8, rsm_memseg_import_get16, rsm_memseg_import_get32, rsm_memseg_import_get64 - read from a segment

cc [ flag... ] file... -lrsm [ library... ]
#include <rsmapi.h>

int rsm_memseg_import_get(rsm_memseg_import_handle_t im_memseg,
 off_t offset, void *dest_addr, size_t length);

int rsm_memseg_import_get8(rsm_memseg_import_handle_t im_memseg,
 off_t offset, uint8_t *datap, ulong_t rep_cnt);

int rsm_memseg_import_get16(rsm_memseg_import_handle_t im_memseg,
 off_t offset, uint16_t *datap, ulong_t rep_cnt);

int rsm_memseg_import_get32(rsm_memseg_import_handle_t im_memseg,
 off_t offset, uint32_t *datap, ulong_t rep_cnt);

int rsm_memseg_import_get64(rsm_memseg_import_handle_t im_memseg,
 off_t offset, uint64_t *datap, ulong_t rep_cnt);

When using interconnects that allow memory mapping (see rsm_memseg_import_map(3RSM)), standard CPU memory operations may be used for accessing memory of a segment. If a mapping is not provided, then explicitly calling these functions facilitates reading from a segment. Depending on the attributes of the extension library of the specific interconnect, these functions may involve performing an implicit mapping before performing the data transfer. Applications can be made interconnect-independent with respect to segment reads by using these functions. The data access error detection is performed through the use of barriers (see rsm_memseg_import_open_barrier(3RSM)). The default barrier operation mode is RSM_BARRIER_MODE_IMPLICIT, meaning that around every get operation open and close barrier are performed automatically. Alternatively, explicit error handling may be set up for these functions (see rsm_memseg_import_set_mode(3RSM)). In either case the barrier should be initialized prior to using these functions using rsm_memseg_import_init_barrier(3RSM).

The rsm_memseg_import_get() function copies length bytes from the imported segment im_memseg beginning at location offset from the start of the segment to a local memory buffer pointed to by dest_addr.

The rsm_memseg_import_get8() function copies rep_cnt number of 8-bit quantities from successive locations starting from offset in the imported segment to successive local memory locations pointed to by datap.

The rsm_memseg_import_get16() functions copies rep_cnt number of 16-bit quantities from successive locations starting from offset in the imported segment to successive local memory locations pointed to by datap. The offset must be aligned at half-word address boundary.

The rsm_memseg_import_get32() function copies rep_cnt number of 32-bit quantities from successive locations starting from offset in the imported segment to successive local memory locations pointed to by datap. The offset must be aligned at word address boundary.

The rsm_memseg_import_get64() function copies rep_cnt number of -bit quantities from successive locations starting from offset in the imported segment to successive local memory locations pointed to by datap. The offset must be aligned at double-word address boundary.

The data transfer functions that transfer small quantities of data (that is, 8-, 16-, 32-, and 64-bit quantities) perform byte swapping prior to the data transfer, in the event that the source and destination have incompatible endian characteristics.

Upon successful completion, these functions return 0. Otherwise, an error value is returned to indicate the error.

These functions can return the following errors: RSMERR_BAD_SEG_HNDL

RSMERR_BAD_ADDR RSMERR_BAD_MEM_ALIGNMENT RSMERR_BAD_OFFSET RSMERR_BAD_LENGTH RSMERR_PERM_DENIED RSMERR_INSUFFICIENT_RESOURCES RSMERR_BARRIER_UNINITIALIZED RSMERR_BARRIER_FAILURE RSMERR_CONN_ABORTED

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE

Interface Stability Evolving

MT-Level MT-Safe

rsm_memseg_import_init_barrier (3RSM), rsm_memseg_import_open_barrier (3RSM), rsm_memseg_import_set_mode (3RSM), attributes (7)