10-29-2002
what do these functions do?
If you are asking how to access a directory listing, then in HP-UX you would use the dirent.h header (man dirent)
The functions allows you to open the directory file and step through the entries one by one.
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LEARN ABOUT MOJAVE
scandir_b
SCANDIR(3) BSD Library Functions Manual SCANDIR(3)
NAME
scandir, scandir_b, alphasort -- scan a directory
SYNOPSIS
#include <sys/types.h>
#include <dirent.h>
int
scandir(const char *dirname, struct dirent ***namelist, int (*select)(const struct dirent *),
int (*compar)(const struct dirent **, const struct dirent **));
int
alphasort(const struct dirent **d1, const struct dirent **d2);
int
scandir_b(const char *dirname, struct dirent ***namelist, int (^select)(const struct dirent *),
int (^compar)(const struct dirent **, const struct dirent **));
DESCRIPTION
The scandir() function reads the directory dirname and builds an array of pointers to directory entries using malloc(3). It returns the num-
ber of entries in the array. A pointer to the array of directory entries is stored in the location referenced by namelist (even if the num-
ber of entries is 0).
The select argument 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 argument 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.
The alphasort() function is a routine which can be used for the compar argument to sort the array alphabetically.
The memory allocated for the array can be deallocated with free(3), by freeing each pointer in the array and then the array itself.
The scandir_b() function works the same way as the scandir() function, except that select and compar are blocks instead of subroutines.
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.
SEE ALSO
directory(3), malloc(3), qsort(3), dir(5)
HISTORY
The scandir() and alphasort() functions appeared in 4.2BSD. The scandir_b() function appeared in Mac OS X 10.6.
BSD
May 20, 2008 BSD