gfs_readdir - read directory entry
char *gfs_readdir (GFS_Dir dir, struct gfs_dirent ** entryp);
The gfs_readdir() function reads a directory entry from dir, and
returns the pointer of the entry to the address pointed to by entryp.
The buffer pointed to by entryp is destroyed when calling succeeding
gfs_readdir() or gfs_closedir() with the same argument dir.
NULL The function terminated successfully.
Others An error except the above occurred. The reason is shown by its
gfs_closedir(3), gfs_opendir(3), gfs_readdir(3)