table of contents
DPNS_READDIRXP(3) | DPNS Library Functions | DPNS_READDIRXP(3) |
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.
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.
- 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
$Date$ | DPNS |