DIRECTORY(3)             DOMAIN/IX SYS5              DIRECTORY(3)



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

USAGE
     #include <sys/types.h>
     #include <dirent.h>

     DIR *opendir(dirname)
     char *dirname;

     struct diren *readdir(dirp)
     DIR *dirp;

     long telldir(dirp)
     DIR *dirp;

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

     void rewinddir(dirp)
     DIR *dirp;

     int closedir(dirp)
     DIR *dirp;


DESCRIPTION
     Opendir opens the directory named by dirname and associates
     a "directory stream" with it.  Opendir returns a pointer
     that identifies the directory stream in subsequent opera-
     tions.  Opendir returns a NULL pointer if dirname cannot be
     accessed, or if malloc(3) cannot allocate enough memory to
     hold the entire DIR structure.

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

     Telldir returns the current location associated with the
     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 opera-
     tion 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



Printed 12/4/86                                       DIRECTORY-1

DIRECTORY(3)             DOMAIN/IX SYS5              DIRECTORY(3)



     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
     to the beginning of the directory.

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

EXAMPLE
     Sample code that searches a directory for entry "name" is:

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


RELATED INFORMATION
     open(2), close(2), read(2), lseek(2)



























DIRECTORY-2                                       Printed 12/4/86