---
name: "rdma_post_writev"
section: "3"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
platforms: ["linux", "freebsd"]
url: "https://new.carta.tech/rdma_post_writev"
---

# rdma\_post\_writev(3)

post an RDMA write work request.

## NAME

rdma\_post\_writev - post an RDMA write work request.

## SYNOPSIS

**#include \<rdma/rdma\_verbs.h\>**

**int rdma\_post\_writev** **(struct rdma\_cm\_id \****id***,** **void \****context***,** **struct ibv\_sge \****sgl***,** **int** *nsge***,** **int** *flags***,** **uint64\_t** *remote\_addr***,** **uint32\_t** *rkey***);**

## ARGUMENTS

- id

  A reference to a communication identifier where the request  will be posted.

- context

  User-defined context associated with the request.

- sgl

  A scatter-gather list of the source buffers of the write.

- nsge

  The number of scatter-gather array entries.

- flags

  Optional flags used to control the write operation.

- remote\_addr

  The address of the remote registered memory to write into.

- rkey

  The registered memory key associated with the remote address.

## DESCRIPTION

Posts a work request to the send queue of the queue pair associated with the rdma\_cm\_id.  The contents of the local data buffers will be written into the remote memory region.

## RETURN VALUE

Returns 0 on success, or -1 on error.  If an error occurs, errno will be set to indicate the failure reason.

## NOTES

For a list of supported flags, see ibv\_post\_send.  Unless inline data is specified, the local data buffers must have been registered before the write is issued, and the buffers must remain registered until the write completes.  The remote buffers must always be registered.

Write operations may not be posted to an rdma\_cm\_id or the corresponding queue pair until it has been connected.

The user-defined context associated with the write request will be returned to the user through the work completion wr\_id, work request identifier, field.

## SEE ALSO

[rdma\_cm(7)](/rdma_cm/7.md), [rdma\_connect(3)](/rdma_connect/3.md), [rdma\_accept(3)](/rdma_accept/3.md), [ibv\_post\_send(3)](/ibv_post_send/3.md), [rdma\_post\_write(3)](/rdma_post_write/3.md), [rdma\_reg\_write(3)](/rdma_reg_write/3.md), [rdma\_reg\_msgs(3)](/rdma_reg_msgs/3.md)