DPNS_READDIR

Section: DPNS Library Functions (3)
Updated: $Date: 2006/03/16 13:02:57 $
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NAME

dpns_readdir - read DPNS directory opened by dpns_opendir in the name server

SYNOPSIS

#include <sys/types.h>
#include <dirent.h>
#include "dpns_api.h"

struct dirent *dpns_readdir (dpns_DIR *dirp)

DESCRIPTION

dpns_readdir reads the DPNS directory opened by dpns_opendir in the name server. This routine returns a pointer to a structure containing the current directory entry. dpns_readdir 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 dpns_opendir.

NOTE

Only the fields d_name, d_reclen and on some platforms d_namlen are filled.

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 dpns_readdir 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 dpns_readdir, 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.
SENOSHOST: Host unknown.
SENOSSERV: Service unknown.
SECOMERR: Communication error.
ENSNACT: Name server is not running or is being shutdown.

AUTHOR

LCG Grid Deployment Team