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.
- SECOMERR
- Communication error.
- ENSNACT
- Name server is not running or is being shutdown.
SEE ALSO¶
dpns_closedir(3),
dpns_opendir(3),
dpns_rewinddir(3),
dirent
AUTHOR¶
LCG Grid Deployment Team