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SCANDIR(3)		   Linux Programmer's Manual		    SCANDIR(3)

       scandir,	 scandirat,  alphasort,	 versionsort  -	 scan  a directory for
       matching entries

       #include <dirent.h>

       int scandir(const char *dirp, struct dirent ***namelist,
	      int (*filter)(const struct dirent *),
	      int (*compar)(const struct dirent **, const struct dirent **));

       int alphasort(const void *a, const void *b);

       int versionsort(const void *a, const void *b);

       #include <fcntl.h>	   /* Definition of AT_* constants */
       #include <dirent.h>

       int scandirat(int dirfd, const char *dirp, struct dirent ***namelist,
	      int (*filter)(const struct dirent *),
	      int (*compar)(const struct dirent **, const struct dirent **));

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       scandir(), alphasort():
	   || /* Since glibc 2.10: */
	       (_POSIX_C_SOURCE >= 200809L || _XOPEN_SOURCE >= 700)

       versionsort(): _GNU_SOURCE

       scandirat(): _GNU_SOURCE

       The scandir() function scans the directory dirp,	 calling  filter()  on
       each  directory	entry.	Entries for which filter() returns nonzero are
       stored in strings allocated via malloc(3), sorted using	qsort(3)  with
       the comparison function compar(), and collected in array namelist which
       is allocated via	 malloc(3).   If  filter  is  NULL,  all  entries  are

       The alphasort() and versionsort() functions can be used as the compari‐
       son function compar().  The former sorts directory entries  using  str‐
       coll(3), the latter using strverscmp(3) on the strings (*a)->d_name and

       The scandirat() function operates in exactly the same way as scandir(),
       except for the differences described here.

       If the pathname given in dirp is relative, then it is interpreted rela‐
       tive to the directory referred to by the file descriptor dirfd  (rather
       than  relative to the current working directory of the calling process,
       as is done by scandir() for a relative pathname).

       If dirp is relative and dirfd is the special value AT_FDCWD, then  dirp
       is interpreted relative to the current working directory of the calling
       process (like scandir()).

       If dirp is absolute, then dirfd is ignored.

       See openat(2) for an explanation of the need for scandirat().

       The  scandir()  function	 returns  the  number  of  directory   entries
       selected.   On  error,  -1  is returned, with errno set to indicate the
       cause of the error.

       The alphasort() and versionsort()  functions  return  an	 integer  less
       than,  equal  to, or greater than zero if the first argument is consid‐
       ered to be respectively less than, equal to, or greater than  the  sec‐

       ENOENT The path in dirp does not exist.

       ENOMEM Insufficient memory to complete the operation.

	      The path in dirp is not a directory.

       The following additional errors can occur for scandirat():

       EBADF  dirfd is not a valid file descriptor.

	      dirp is a relative path and dirfd is a file descriptor referring
	      to a file other than a directory.

       versionsort() was added to glibc in version 2.1.

       scandirat() was added to glibc in version 2.15.

       alphasort(), scandir(): 4.3BSD, POSIX.1-2008.

       versionsort() and scandirat() are GNU extensions.

       Since glibc 2.1, alphasort() calls strcoll(3);  earlier	it  used  str‐

       #define _SVID_SOURCE
       /* print files in current directory in reverse order */
       #include <dirent.h>

	   struct dirent **namelist;
	   int n;

	   n = scandir(".", &namelist, NULL, alphasort);
	   if (n < 0)
	   else {
	       while (n--) {
		   printf("%s\n", namelist[n]->d_name);

       closedir(3),    fnmatch(3),   opendir(3),   readdir(3),	 rewinddir(3),
       seekdir(3), strcmp(3), strcoll(3), strverscmp(3), telldir(3)

       This page is part of release 3.65 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at

GNU				  2014-02-21			    SCANDIR(3)

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