scandir(3)                 DG/UX 4.30                  scandir(3)



     NAME
          scandir, alphasort - scan a directory

     SYNOPSIS
          #include <sys/dir.h>

          scandir(dirname, namelist, select, compar)
          char *dirname;
          struct direct *(*namelist[]);
          int (*select)();
          int (*compar)();

          alphasort(d1, d2)
          struct direct **d1, **d2;

     DESCRIPTION
          Scandir reads the directory dirname and builds an array of
          pointers to directory entries using malloc(3).  It returns
          the number of entries in the array and a pointer to the
          array through namelist.

          The select parameter is a pointer to a user supplied
          subroutine which is called by scandir to select which
          entries are to be included in the array.  The select routine
          is passed a pointer to a directory entry and should return a
          non-zero value if the directory entry is to be included in
          the array.  If select is null, then all the directory
          entries will be included.

          The compar parameter is a pointer to a user supplied
          subroutine which is passed to qsort(3) to sort the completed
          array. If this pointer is null, the array is not sorted.
          Alphasort is a routine which can be used for the compar
          parameter to sort the array alphabetically.

          The memory allocated for the array can be deallocated with
          free (see malloc(3)) by freeing each pointer in the array
          and the array itself.

     SEE ALSO
          directory(3), malloc(3), qsort(3), dir(5)

     DIAGNOSTICS
          Returns -1 if the directory cannot be opened for reading or
          if malloc(3) cannot allocate enough memory to hold all the
          data structures.









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