scandir(3)scandir(3)Namescandir - scan a directory
Syntax
#include <sys/types.h>
#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
The subroutine reads the directory dirname and builds an array of
pointers to directory entries using 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 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 to sort the completed array. If this pointer is null, the
array is not sorted. The 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 by
freeing each pointer in the array and the array itself. For further
information, see
Diagnostics
Returns -1 if the directory cannot be opened for reading or if cannot
allocate enough memory to hold all the data structures.
See Alsodirectory(3), malloc(3), qsort(3), dir(5)scandir(3)