DIRECTORY(S)             XENIX System V              DIRECTORY(S)



     Name
          opendir, readdir, telldir, seekdir, rewinddir, closedir -
          Performs directory operations.

     Syntax
          #include <sys/ndir.h>

          DIR *opendir(filename)
          char *filename;

          struct direct *readdir(dirp)
          DIR *dirp;

          long telldir(dirp)
          DIR *dirp;

          seekdir(dirp, loc)
          DIR *dirp;
          long loc;

          rewinddir(dirp)
          DIR *dirp;

          closedir(dirp)
          DIR *dirp;

     Description
          opendir opens the directory named by filename and associates
          a directory stream with it.  opendir returns a pointer to be
          used to identify the directory stream in subsequent
          operations.  The NULL pointer is returned if filename cannot
          be accessed or if it is not a directory.

          readdir returns a pointer to the next directory entry.  It
          returns NULL upon reaching the end of the directory or
          detecting an invalid seekdir operation.

          telldir returns the current location associated with the
          named directory stream.

          seekdir sets the position of the next readdir operation on
          the directory stream.  The new position reverts to the one
          associated with the directory stream when the telldir
          operation was performed.  Values returned by telldir are
          good only for the lifetime of the DIR pointer from which
          they are derived.  If the directory is closed and then
          reopened, the telldir value may be invalidated due to
          undetected directory compaction.  It is safe to use a
          previous telldir value immediately after a call to opendir
          and before any calls to readdir.

          rewinddir resets the position of the named directory stream



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     DIRECTORY(S)             XENIX System V              DIRECTORY(S)



          to the beginning of the directory.

          closedir causes the named directory stream to be closed, and
          the structure associated with the DIR pointer to be freed.

          Sample code which searches a directory for the entry
          ``name'' is shown below:

               len = strlen(name);
               dirp = opendir(".");
               for (dp = readdir(dirp); dp != NULL; dp =
          readdir(dirp))
                    if (dp->d_namlen == len &&
                       !strcmp(dp->d_name, name)) {
                         closedir(dirp);
                         return FOUND;
                    }
               closedir(dirp);
               return NOT_FOUND;

     See Also
          close(S), lseek(S), open(S), read(S)

     Notes
          This routine must be linked with the linker option -lx.






























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