READDIR(2) Linux Programmer's Manual READDIR(2)NAMEreaddir - read directory entry
SYNOPSIS
int readdir(unsigned int fd, struct old_linux_dirent *dirp,
unsigned int count);
Note: There is no glibc wrapper for this system call; see NOTES.
DESCRIPTION
This is not the function you are interested in. Look at readdir(3) for
the POSIX conforming C library interface. This page documents the bare
kernel system call interface, which is superseded by getdents(2).
readdir() reads one old_linux_dirent structure from the directory
referred to by the file descriptor fd into the buffer pointed to by
dirp. The argument count is ignored; at most one old_linux_dirent
structure is read.
The old_linux_dirent structure is declared as follows:
struct old_linux_dirent {
long d_ino; /* inode number */
off_t d_off; /* offset to this old_linux_dirent */
unsigned short d_reclen; /* length of this d_name */
char d_name[NAME_MAX+1]; /* filename (null-terminated) */
}
d_ino is an inode number. d_off is the distance from the start of the
directory to this old_linux_dirent. d_reclen is the size of d_name,
not counting the terminating null byte ('\0'). d_name is a null-termi‐
nated filename.
RETURN VALUE
On success, 1 is returned. On end of directory, 0 is returned. On
error, -1 is returned, and errno is set appropriately.
ERRORS
EBADF Invalid file descriptor fd.
EFAULT Argument points outside the calling process's address space.
EINVAL Result buffer is too small.
ENOENT No such directory.
ENOTDIR
File descriptor does not refer to a directory.
CONFORMING TO
This system call is Linux-specific.
NOTES
Glibc does not provide a wrapper for this system call; call it using
syscall(2). You will need to define the old_linux_dirent structure
yourself. However, probably you should use readdir(3) instead.
This system call does not exist on x86-64.
SEE ALSOgetdents(2), readdir(3)COLOPHON
This page is part of release 4.14 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
Linux 2017-09-15 READDIR(2)
