Standard C Library (libc, -lc)

SYNOPSIS

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

     DIR *
     opendir(const char *filename);

     struct dirent *
     readdir(DIR *dirp);

     int
     readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result);

     long
     telldir(DIR *dirp);

     void
     seekdir(DIR *dirp, long loc);

     void
     rewinddir(DIR *dirp);

     int
     closedir(DIR *dirp);

     int
     dirfd(DIR *dirp);

DESCRIPTION

     The opendir() function opens the directory named by filename, associates
     a directory stream with it and 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.

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

     readdir_r() provides the same functionality as readdir(), but the caller
     must provide a directory entry buffer to store the results in.  If the
     read succeeds, result is pointed at the entry; upon reaching the end of
     the directory result is set to NULL.  readdir_r() returns 0 on success or
     an error number to indicate failure.

     The telldir() function returns the current location associated with the
     named directory stream.  Values returned by telldir() are good only for
     the lifetime of the DIR pointer, dirp, from which they are derived.  If
     the directory is closed and then reopened, prior values returned by
     telldir() will no longer be valid.
     the named directory stream, see open(2).

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

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

SEE ALSO

     close(2), lseek(2), open(2), read(2), dir(5)

HISTORY

     The opendir(), readdir(), telldir(), seekdir(), rewinddir(), closedir(),
     and dirfd() functions appeared in 4.2BSD.

BSD                              June 4, 1993                              BSD