directory(3)                                         directory(3)



     NAME
          opendir, readdir, telldir, seekdir, rewinddir, closedir -
          directory operations

     SYNOPSIS
          #include <sys/dir.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 pointer NULL is returned if filename cannot
          be accessed, or if it cannot malloc(3) enough memory to hold
          the whole thing.

          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.




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     directory(3)                                         directory(3)



          rewinddir resets the position of the named directory stream
          to the beginning of the directory.

          closedir closes the named directory stream and frees the
          structure associated with the DIR pointer.

          Sample code which searchs a directory for entry ``name'' is:

               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
          open(2), close(2), read(2), lseek(2), dir(4).

































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