NAME
dpns_readdir - read DPNS directory opened by dpns_opendir in the name
server
SYNOPSIS
#include <sys/types.h>
#include "dpns_api.h"
struct dpns_direnstatg *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 including the GUID associated.
struct dpns_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 */
};
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.
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.
SEE ALSO
dpns_closedir(3), dpns_opendir(3), dpns_rewinddir(3)
AUTHOR
LCG Grid Deployment Team