readdir(2)

1READDIR(2)                 Linux Programmer's Manual                READDIR(2)
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NAME

6       readdir - read directory entry
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SYNOPSIS

9       int readdir(unsigned int fd, struct old_linux_dirent *dirp,
10                   unsigned int count);
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12       Note: There is no glibc wrapper for this system call; see NOTES.
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DESCRIPTION

15       This is not the function you are interested in.  Look at readdir(3) for
16       the POSIX conforming C library interface.  This page documents the bare
17       kernel system call interface, which is superseded by getdents(2).
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19       readdir()  reads  one  old_linux_dirent  structure  from  the directory
20       referred to by the file descriptor fd into the  buffer  pointed  to  by
21       dirp.   The  argument  count  is  ignored; at most one old_linux_dirent
22       structure is read.
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24       The old_linux_dirent structure is declared as follows:
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26           struct old_linux_dirent {
27               long  d_ino;              /* inode number */
28               off_t d_off;              /* offset to this old_linux_dirent */
29               unsigned short d_reclen;  /* length of this d_name */
30               char  d_name[NAME_MAX+1]; /* filename (null-terminated) */
31           }
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33       d_ino is an inode number.  d_off is the distance from the start of  the
34       directory  to  this  old_linux_dirent.  d_reclen is the size of d_name,
35       not counting the terminating null byte ('\0').  d_name is a null-termi‐
36       nated filename.
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RETURN VALUE

39       On  success,  1  is  returned.  On end of directory, 0 is returned.  On
40       error, -1 is returned, and errno is set appropriately.
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ERRORS

43       EBADF  Invalid file descriptor fd.
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45       EFAULT Argument points outside the calling process's address space.
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47       EINVAL Result buffer is too small.
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49       ENOENT No such directory.
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51       ENOTDIR
52              File descriptor does not refer to a directory.
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CONFORMING TO

55       This system call is Linux-specific.
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NOTES

58       Glibc does not provide a wrapper for this system call;  call  it  using
59       syscall(2).   You  will  need  to define the old_linux_dirent structure
60       yourself.  However, probably you should use readdir(3) instead.
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62       This system call does not exist on x86-64.
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COLOPHON

68       This page is part of release 3.53 of the Linux  man-pages  project.   A
69       description  of  the project, and information about reporting bugs, can
70       be found at http://www.kernel.org/doc/man-pages/.
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74Linux                             2013-06-21                        READDIR(2)