---
name: "rpma_send"
section: "3"
platform: "linux"
package: "librpma-dev"
version: "1.3.0-2+b3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/rpma_send"
---

# rpma\_send(3)

initiate the send operation

## NAME

**rpma\_send** - initiate the send operation

## SYNOPSIS

```
      #include <librpma.h>
      struct rpma_conn;
      struct rpma_mr_local;
      int rpma_send(struct rpma_conn *conn, const struct rpma_mr_local *src, size_t offset,
                      size_t len, int flags, const void *op_context);
```

## DESCRIPTION

**rpma\_send**() initiates the send operation which transfers a message from the local memory to other side of the connection. To send a 0 byte message, set src to NULL and both offset and len to 0.

The attribute flags set the completion notification indicator:

- •

  RPMA\_F\_COMPLETION\_ON\_ERROR - generate the completion on error

- •

  RPMA\_F\_COMPLETION\_ALWAYS - generate the completion regardless of result of the operation.

op\_context is returned in the wr\_id field of the completion (struct ibv\_wc).

## RETURN VALUE

The **rpma\_send**() function returns 0 on success or a negative error code on failure.

## ERRORS

**rpma\_send**() can fail with the following errors:

- •

  RPMA\_E\_INVAL - conn == NULL \|\| flags == 0

- •

  RPMA\_E\_INVAL - src == NULL && (offset != 0 \|\| len != 0)

- •

  RPMA\_E\_PROVIDER - [**ibv\_post\_send**(3)](/ibv_post_send/3.md) failed

## SEE ALSO

[**rpma\_conn\_req\_connect**(3)](/rpma_conn_req_connect/3.md), [**rpma\_mr\_reg**(3)](/rpma_mr_reg/3.md), [**librpma**(7)](/librpma/7.md) and https://pmem.io/rpma/