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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
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READDIR(2) Linux Programmer's Manual READDIR(2)
readdir - read directory entry
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.
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superseded by getdents(2).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 (privately in Linux
kernel file fs/readdir.c) as follows:
struct old_linux_dirent {
unsigned long d_ino; /* inode number */
unsigned long d_offset; /* offset to this old_linux_dirent */
unsigned short d_namlen; /* length of this d_name */
char d_name[1]; /* filename (null-terminated) */
}
d_ino is an inode number. d_offset 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-terminated filename.
On success, 1 is returned. On end of directory, 0 is returned.
On error, -1 is returned, and errno is set appropriately.
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.
This system call is Linux-specific.
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.
getdents(2), readdir(3)
This page is part of release 5.10 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 2019-03-06 READDIR(2)
Pages that refer to this page: fanotify_mark(2), getdents(2), read(2), syscalls(2), seekdir(3), fanotify(7)
Copyright and license for this manual page
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