---
name: "dpns_creat"
section: "3"
platform: "linux"
package: "libdpm-dev"
version: "1.10.0-2+b3"
release: "Debian 10 (Buster)"
platforms: ["linux"]
url: "https://new.carta.tech/dpns_creat"
---

# dpns\_creat(3)

create a new DPNS file or reset it in the name server

## NAME

dpns\_creat - create a new DPNS file or reset it in the name server

## SYNOPSIS

**#include \<sys/types.h\>**\
 **#include "dpns\_api.h"**

**int dpns\_creat (const char \****path***,** **mode\_t** *mode***)**

**int dpns\_creatx (const char \****path***,** **mode\_t** *mode***,** **struct dpns\_fileid \****file\_uniqueid***)**

## DESCRIPTION

**dpns\_creat** creates a new DPNS file or resets it in the name server.

If the file exists, the length is truncated to 0 and the mode and owner are unchanged.

If the file does not exist yet, an entry is created in the name server database and the file's owner ID is set to the effective user ID of the requestor. The group ID of the file is set to the effective group ID of the requestor or is taken from the parent directory if the latter has the **S\_ISGID** bit set.

The access permission bits for the file are taken from *mode*, then all bits set in the requestor's file mode creation mask are cleared (see [**dpns\_umask**(3)](/dpns_umask/3.md)).

**dpns\_creatx** behaves in the same way and returns the file unique id (name server hostname and file id).

- *path*

  specifies the logical pathname relative to the current DPNS directory or the full DPNS pathname.

## RETURN VALUE

This routine returns 0 if the operation was successful or -1 if the operation failed. In the latter case, **serrno** is set appropriately.

## ERRORS

- **ENOENT**

  A component of *path* prefix does not exist or *path* is a null pathname.

- **EACCES**

  Search permission is denied on a component of the *path* prefix or the file does not exist and write permission on the parent directory is denied or the file exists and write permission on the file itself is denied.

- **EFAULT**

  *path* or *file\_uniqueid* is a NULL pointer.

- **EEXIST**

  File exists already and has replicas.

- **ENOTDIR**

  A component of *path* prefix is not a directory.

- **EISDIR**

  *path* is an existing directory.

- **EINVAL**

  The fileclass in the parent directory is zero.

- **ENOSPC**

  The name server database is full.

- **ENAMETOOLONG**

  The length of *path* exceeds **CA\_MAXPATHLEN** or the length of a *path* component exceeds **CA\_MAXNAMELEN**.

- **SENOSHOST**

  Host unknown.

- **SENOSSERV**

  Service unknown.

- **SECOMERR**

  Communication error.

- **ENSNACT**

  Name server is not running or is being shutdown.

## SEE ALSO

**[Castor\_limits(4)](/Castor_limits/4.md)**, **[dpns\_chdir(3)](/dpns_chdir/3.md)**, **[dpns\_chmod(3)](/dpns_chmod/3.md)**, **[dpns\_stat(3)](/dpns_stat/3.md), [dpns\_statg(3)](/dpns_statg/3.md)**, **[dpns\_umask(3)](/dpns_umask/3.md)**

## AUTHOR

**LCG Grid Deployment** Team