---
name: "io_uring_prep_sync_file_range"
section: "3"
platform: "linux"
package: "liburing"
version: "2.15-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/io_uring_prep_sync_file_range"
---

# io\_uring\_prep\_sync\_file\_range(3)

prepare a sync\_file\_range request

## NAME

io\_uring\_prep\_sync\_file\_range - prepare a sync\_file\_range request

## SYNOPSIS

```
#include <fcntl.h>
#include <liburing.h>
```

**void io\_uring\_prep\_sync\_file\_range(struct io\_uring\_sqe \****sqe***,**                                    **int** *fd***,**                                    **unsigned** *len***,**                                    **\_\_u64** *offset***,**                                    **int** *flags***);**

## DESCRIPTION

The [**io\_uring\_prep\_sync\_file\_range**(3)](/io_uring_prep_sync_file_range/3.md) function prepares a sync\_file\_range request. The submission queue entry *sqe* is setup to use the file descriptor *fd* that should get *len* bytes synced started at offset *offset* and with modifier flags in the *flags* argument.

This function prepares an async [**sync\_file\_range**(2)](/sync_file_range/2.md) request. See that man page for details on the arguments.

## RETURN VALUE

None

## ERRORS

The CQE *res* field will contain the result of the operation. See the related man page for details on possible values. Note that where synchronous system calls will return **-1** on failure and set *errno* to the actual error value, io\_uring never uses *errno*. Instead it returns the negated *errno* directly in the CQE *res* field.

## SEE ALSO

[**io\_uring\_get\_sqe**(3)](/io_uring_get_sqe/3.md), [**io\_uring\_submit**(3)](/io_uring_submit/3.md), [**sync\_file\_range**(2)](/sync_file_range/2.md)