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  • LINUX man pages
  • Linux Man Page Viewer


    The following form allows you to view linux man pages.

    Command:

    scandir

    
    
    
    

    SYNOPSIS

           #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():
               _BSD_SOURCE || _SVID_SOURCE
               || /* Since glibc 2.10: */
                   (_POSIX_C_SOURCE >= 200809L || _XOPEN_SOURCE >= 700)
    
           versionsort(): _GNU_SOURCE
    
           scandirat(): _GNU_SOURCE
    
    
    

    DESCRIPTION

           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
           selected.
    
           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
           (*b)->d_name.
    
       scandirat()
           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).
    
           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-
           ond.
    
    
    

    ERRORS

           ENOENT The path in dirp does not exist.
    
           ENOMEM Insufficient memory to complete the operation.
    
           ENOTDIR
                  The path in dirp is not a directory.
    
           The following additional errors can occur for scandirat():
    
           EBADF  dirfd is not a valid file descriptor.
    
           ENOTDIR
                  dirp is a relative path and dirfd is a file descriptor referring
                  to a file other than a directory.
    
    
    

    VERSIONS

           versionsort() was added to glibc in version 2.1.
    
           scandirat() was added to glibc in version 2.15.
    
    
    

    CONFORMING TO

           alphasort(), scandir(): 4.3BSD, POSIX.1-2008.
    
           versionsort() and scandirat() are GNU extensions.
    
    
    

    NOTES

           Since glibc 2.1, alphasort() calls strcoll(3);  earlier  it  used  str-
           cmp(3).
    
    
    

    EXAMPLE

           #define _SVID_SOURCE
           /* print files in current directory in reverse order */
           #include <dirent.h>
    
           int
           main(void)
           {
               struct dirent **namelist;
               int n;
    
               n = scandir(".", &namelist, NULL, alphasort);
               if (n < 0)
                   perror("scandir");
               else {
                   while (n--) {
                       printf("%s\n", namelist[n]->d_name);
                       free(namelist[n]);
    
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