DIRECTORY(3C)           COMMAND REFERENCE           DIRECTORY(3C)



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

SYNOPSIS
     #include <sys/types.h>
     #include <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(3c) 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.



Printed 10/17/86                                                1

DIRECTORY(3C)           COMMAND REFERENCE           DIRECTORY(3C)



     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.

EXAMPLES
     A sample code which searchs a directory for entry filename
     is:


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

CAVEATS
     Old UNIX programs which examine directories should be
     converted to use this package, as the new directory format
     is not obvious.

     Opendir will open any file as a directory, so the file
     should be checked to make sure it is a directory by using
     stat(2) .

SEE ALSO
     lseek(2), open(2), close(2), read(2), stat(2).





















Printed 10/17/86                                                2

%%index%%
na:72,119;
sy:191,1659;
de:1850,2031;4025,379;
ex:4404,487;
ca:4891,386;
se:5277,175;
%%index%%000000000119