SCANDIR(3) Library Functions Manual SCANDIR(3)
scandir - scan a directory
scandir(dirname, namelist, select, compar)
struct direct *(*namelist);
struct direct **d1, **d2;
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
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.
directory(3), malloc(3), qsort(3), dir(5)
Returns -1 if the directory cannot be opened for reading or if mal-
loc(3) cannot allocate enough memory to hold all the data structures.
4th Berkeley Distribution 19 January 1983 SCANDIR(3)