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

# lfc\_readdirg(3)

read LFC directory opened by lfc\_opendir in the name server

## NAME

lfc\_readdirg - read LFC directory opened by **lfc\_opendir** in the name server

## SYNOPSIS

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

**struct lfc\_direnstatg \*lfc\_readdirg (lfc\_DIR \****dirp***)**

## DESCRIPTION

**lfc\_readdirg** reads the LFC directory opened by **lfc\_opendir** in the name server. This routine returns a pointer to a structure containing the current directory entry including the GUID associated.

```
struct lfc_direnstatg {
	u_signed64	fileid;
	char		guid[CA_MAXGUIDLEN+1];
	mode_t		filemode;
	int		nlink;		/* number of files in a directory */
	uid_t		uid;
	gid_t		gid;
	u_signed64	filesize;
	time_t		atime;		/* last access to file */
	time_t		mtime;		/* last file modification */
	time_t		ctime;		/* last metadata modification */
	short		fileclass;	/* not used */
	char		status;		/* ' ' --> online, 'm' --> migrated */
	char		csumtype[3];	/* "CS", "AD" or "MD" */
	char		csumvalue[33];
	unsigned short	d_reclen;	/* length of this entry */
	char		d_name[1];	/* basename in variable length */
};
```

**lfc\_readdirg** caches a variable number of such entries, depending on the filename size, to minimize the number of requests to the name server.

- *dirp*

  specifies the pointer value returned by **lfc\_opendir**.

## RETURN VALUE

This routine returns a pointer to a structure containing the current directory entry if the operation was successful or NULL if the end of the directory was reached or if the operation failed. When the end of the directory is encountered,  serrno is not changed. If the operation failed, **serrno** is set appropriately.

As lfc\_readdirg returns a null pointer both at the end of the directory and on error, an application wishing to check  for error situations should set  **serrno** to 0, then call lfc\_readdirg, then check  **serrno** and if it is non-zero, assume an error has occurred.

## ERRORS

- **EBADF**

  File descriptor in DIR structure is invalid.

- **EFAULT**

  *dirp* is a NULL pointer.

- **SECOMERR**

  Communication error.

- **ENSNACT**

  Name server is not running or is being shutdown.

## SEE ALSO

**[lfc\_closedir(3)](/lfc_closedir/3.md)**, **[lfc\_opendirg(3)](/lfc_opendirg/3.md)**, **[lfc\_rewinddir(3)](/lfc_rewinddir/3.md)**

## AUTHOR

**LCG Grid Deployment** Team