NAME
dpns_readdirxp - read DPNS directory opened by dpns_opendir in the name
server
SYNOPSIS
#include <sys/types.h>
#include "dpns_api.h"
struct dpns_direnrep *dpns_readdirxp (dpns_DIR *dirp, char *pattern,
char *se)
DESCRIPTION
dpns_readdirxp reads the DPNS directory opened by dpns_opendir in the
name server. It does restricted pattern matching on basename. This
routine returns a pointer to a structure containing the current
directory entry (basename, guid and filesize) and the replica
information.
struct dpns_rep_info {
u_signed64 fileid;
char status;
char *host;
char *sfn;
};
struct dpns_direnrep {
u_signed64 fileid;
char guid[CA_MAXGUIDLEN+1];
mode_t filemode;
u_signed64 filesize;
int nbreplicas;
struct dpns_rep_info *rep; /* array of replica info structures */
unsigned short d_reclen; /* length of this entry */
char d_name[1]; /* basename in variable length */
};
dpns_readdirxp 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.
pattern
allows to restrict the listing to entries having the basename
starting with this pattern.
se allows to restrict the replica entries to a given SE.
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_readdirxp 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_readdirxp, then check
serrno and if it is non-zero, assume an error has occurred.
ERRORS
EBADF File descriptor in DIR structure is invalid.
ENOMEM Memory could not be allocated for unmarshalling the reply.
EFAULT dirp is a NULL pointer.
EINVAL The length of pattern exceeds CA_MAXNAMELEN or the length
of se exceeds CA_MAXHOSTNAMELEN.
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