io\_uring\_prep\_cmd\_getsockname(3) liburing Manual io\_uring\_prep\_cmd\_getsockname(3)

# [NAME](#NAME)

io\_uring\_prep\_cmd\_getsockname - prepare a getsockname or getpeername request

# [SYNOPSIS](#SYNOPSIS)

```
#include <sys/socket.h>
#include <liburing.h>
```

```
void io_uring_prep_cmd_getsockname(struct io_uring_sqe *sqe,
                                   int fd,
                                   struct sockaddr *sockaddr,
                                   socklen_t *sockaddr_len,
                                   int peer);
```

# [DESCRIPTION](#DESCRIPTION)

The [**io\_uring\_prep\_cmd\_getsockname**(3)](/man/os/liburing/io_uring_prep_cmd_getsockname.3) function prepares a getsockname/getpeername request. The submission queue entry *sqe* is setup to fetch the locally bound address or peer address of the socket file descriptor pointed by *sockfd*. The parameter *sockaddr* points to a region of size *sockaddr\_len* where the output is written. *sockaddr\_len* is modified by the kernel on return to indicate how many bytes were written. The output address is the locally bound address if *peer* is set to **0** or the peer address if *peer* is set to **1**.

This function prepares an async [**getsockname**(2)](/man/os/liburing/getsockname.2) or [**getpeername**(2)](/man/os/liburing/getpeername.2) request. See those man pages for details.

# [RETURN VALUE](#RETURN_VALUE)

None

# [ERRORS](#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. Differently from the equivalent system calls, if the user attempts to use this operation on a non-socket file descriptor, the CQE error result is *ENOTSUP* instead of *ENOSOCK.*

# [SEE ALSO](#SEE_ALSO)

[**io\_uring\_get\_sqe**(3)](/man/os/liburing/io_uring_get_sqe.3), [**io\_uring\_submit**(3)](/man/os/liburing/io_uring_submit.3), [**getsockname**(2)](/man/os/liburing/getsockname.2), [**getpeername**(2)](/man/os/liburing/getpeername.2)

December 3, 2025 liburing-2.13

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Document: io_uring_prep_cmd_getsockname(3) from liburing 2.15-r5 (Chainguard OS)
Source: https://github.com/axboe/liburing.git