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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON |
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mkdir(2) System Calls Manual mkdir(2)
mkdir, mkdirat - create a directory
Standard C library (libc, -lc)
#include <sys/stat.h>
int mkdir(const char *pathname, mode_t mode);
#include <fcntl.h> /* Definition of AT_* constants */
#include <sys/stat.h>
int mkdirat(int dirfd, const char *pathname, mode_t mode);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
mkdirat():
Since glibc 2.10:
_POSIX_C_SOURCE >= 200809L
Before glibc 2.10:
_ATFILE_SOURCE
mkdir() attempts to create a directory named pathname.
The argument mode specifies the mode for the new directory (see
inode(7)). It is modified by the process's umask in the usual
way: in the absence of a default ACL, the mode of the created
directory is (mode & ~umask & 0777). Whether other mode bits are
honored for the created directory depends on the operating
system. For Linux, see NOTES below.
The newly created directory will be owned by the effective user
ID of the process. If the directory containing the file has the
set-group-ID bit set, or if the filesystem is mounted with BSD
group semantics (mount -o bsdgroups or, synonymously mount -o
grpid), the new directory will inherit the group ownership from
its parent; otherwise it will be owned by the effective group ID
of the process.
If the parent directory has the set-group-ID bit set, then so
will the newly created directory.
mkdirat()
The mkdirat() system call operates in exactly the same way as
mkdir(), except for the differences described here.
If the pathname given in pathname is relative, then it is
interpreted relative to the directory referred to by the file
descriptor dirfd (rather than relative to the current working
directory of the calling process, as is done by mkdir() for a
relative pathname).
If pathname is relative and dirfd is the special value AT_FDCWD,
then pathname is interpreted relative to the current working
directory of the calling process (like mkdir()).
If pathname is absolute, then dirfd is ignored.
See openat(2) for an explanation of the need for mkdirat().
mkdir() and mkdirat() return zero on success. On error, -1 is
returned and errno is set to indicate the error.
EACCES The parent directory does not allow write permission to
the process, or one of the directories in pathname did not
allow search permission. (See also path_resolution(7).)
EBADF (mkdirat()) pathname is relative but dirfd is neither
AT_FDCWD nor a valid file descriptor.
EDQUOT The user's quota of disk blocks or inodes on the
filesystem has been exhausted.
EEXIST pathname already exists (not necessarily as a directory).
This includes the case where pathname is a symbolic link,
dangling or not.
EFAULT pathname points outside your accessible address space.
EINVAL The final component ("basename") of the new directory's
pathname is invalid (e.g., it contains characters not
permitted by the underlying filesystem).
ELOOP Too many symbolic links were encountered in resolving
pathname.
EMLINK The number of links to the parent directory would exceed
LINK_MAX.
ENAMETOOLONG
pathname was too long.
ENOENT A directory component in pathname does not exist or is a
dangling symbolic link.
ENOMEM Insufficient kernel memory was available.
ENOSPC The device containing pathname has no room for the new
directory.
ENOSPC The new directory cannot be created because the user's
disk quota is exhausted.
ENOTDIR
A component used as a directory in pathname is not, in
fact, a directory.
ENOTDIR
(mkdirat()) pathname is relative and dirfd is a file
descriptor referring to a file other than a directory.
EPERM The filesystem containing pathname does not support the
creation of directories.
EROFS pathname refers to a file on a read-only filesystem.
Under Linux, apart from the permission bits, the S_ISVTX mode bit
is also honored.
glibc notes
On older kernels where mkdirat() is unavailable, the glibc
wrapper function falls back to the use of mkdir(). When pathname
is a relative pathname, glibc constructs a pathname based on the
symbolic link in /proc/self/fd that corresponds to the dirfd
argument.
POSIX.1-2008.
mkdir()
SVr4, BSD, POSIX.1-2001.
mkdirat()
Linux 2.6.16, glibc 2.4.
There are many infelicities in the protocol underlying NFS. Some
of these affect mkdir().
mkdir(1), chmod(2), chown(2), mknod(2), mount(2), rmdir(2),
stat(2), umask(2), unlink(2), acl(5), path_resolution(7)
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
man-pages@man7.org
Linux man-pages 6.9.1 2024-05-02 mkdir(2)
Pages that refer to this page: mkdir(1), chmod(2), chown(2), fanotify_mark(2), fcntl(2), io_uring_enter2(2), io_uring_enter(2), mknod(2), open(2), rmdir(2), seccomp_unotify(2), syscalls(2), umask(2), io_uring_prep_mkdir(3), io_uring_prep_mkdirat(3), mkdtemp(3), mode_t(3type), proc_pid_attr(5), cpuset(7), inotify(7), signal-safety(7), mount(8)
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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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