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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | STANDARDS | SEE ALSO | COLOPHON |
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readdir(2) System Calls Manual readdir(2)
readdir - read directory entry
Standard C library (libc, -lc)
#include <sys/syscall.h> /* Definition of SYS_* constants */
#include <unistd.h>
int syscall(SYS_readdir, unsigned int fd,
struct old_linux_dirent *dirp, unsigned int count);
Note: There is no definition of struct old_linux_dirent; 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superseded by getdents(2).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 to indicate the error.
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.
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.
Linux.
getdents(2), readdir(3)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.9.1.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.9.1 2024-06-15 readdir(2)
Pages that refer to this page: fanotify_mark(2), getdents(2), read(2), syscalls(2), seekdir(3), fanotify(7)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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