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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DESCRIPTION

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15       kernel system call interface, which is superseded by getdents(2).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

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

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

53       This system call is Linux-specific.
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NOTES

56       Glibc does not provide a wrapper for this system call;  call  it  using
57       syscall(2).   You  will  need  to define the old_linux_dirent structure
58       yourself.
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SEE ALSO

61       getdents(2), readdir(3)
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COLOPHON

64       This page is part of release 3.22 of the Linux  man-pages  project.   A
65       description  of  the project, and information about reporting bugs, can
66       be found at http://www.kernel.org/doc/man-pages/.
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70Linux                             2008-10-02                        READDIR(2)
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