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-.\" This manpage is Copyright (C) 1992 Drew Eckhardt;
-.\" and Copyright (C) 1993 Michael Haardt
-.\" and Copyright (C) 1993,1994 Ian Jackson
-.\" and Copyright (C) 2006, 2014 Michael Kerrisk
-.\"
-.\" SPDX-License-Identifier: GPL-1.0-or-later
-.\"
-.TH mkdir 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-mkdir, mkdirat \- create a directory
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <sys/stat.h>
-.\" .B #include <unistd.h>
-.P
-.BI "int mkdir(const char *" pathname ", mode_t " mode );
-.P
-.BR "#include <fcntl.h> " "/* Definition of AT_* constants */"
-.B #include <sys/stat.h>
-.P
-.BI "int mkdirat(int " dirfd ", const char *" pathname ", mode_t " mode );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR mkdirat ():
-.nf
- Since glibc 2.10:
- _POSIX_C_SOURCE >= 200809L
- Before glibc 2.10:
- _ATFILE_SOURCE
-.fi
-.SH DESCRIPTION
-.BR mkdir ()
-attempts to create a directory named
-.IR pathname .
-.P
-The argument
-.I mode
-specifies the mode for the new directory (see
-.BR inode (7)).
-It is modified by the process's
-.I umask
-in the usual way: in the absence of a default ACL, the mode of the
-created directory is
-.RI ( mode " & \[ti]" umask " & 0777)."
-Whether other
-.I mode
-bits are honored for the created directory depends on the operating system.
-For Linux, see NOTES below.
-.P
-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
-.RI ( "mount \-o bsdgroups"
-or, synonymously
-.IR "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.
-.P
-If the parent directory has the set-group-ID bit set, then so will the
-newly created directory.
-.\"
-.\"
-.SS mkdirat()
-The
-.BR mkdirat ()
-system call operates in exactly the same way as
-.BR mkdir (),
-except for the differences described here.
-.P
-If the pathname given in
-.I pathname
-is relative, then it is interpreted relative to the directory
-referred to by the file descriptor
-.I dirfd
-(rather than relative to the current working directory of
-the calling process, as is done by
-.BR mkdir ()
-for a relative pathname).
-.P
-If
-.I pathname
-is relative and
-.I dirfd
-is the special value
-.BR AT_FDCWD ,
-then
-.I pathname
-is interpreted relative to the current working
-directory of the calling process (like
-.BR mkdir ()).
-.P
-If
-.I pathname
-is absolute, then
-.I dirfd
-is ignored.
-.P
-See
-.BR openat (2)
-for an explanation of the need for
-.BR mkdirat ().
-.SH RETURN VALUE
-.BR mkdir ()
-and
-.BR mkdirat ()
-return zero on success.
-On error, \-1 is returned and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EACCES
-The parent directory does not allow write permission to the process,
-or one of the directories in
-.I pathname
-did not allow search permission.
-(See also
-.BR path_resolution (7).)
-.TP
-.B EBADF
-.RB ( mkdirat ())
-.I pathname
-is relative but
-.I dirfd
-is neither
-.B AT_FDCWD
-nor a valid file descriptor.
-.TP
-.B EDQUOT
-The user's quota of disk blocks or inodes on the filesystem has been
-exhausted.
-.TP
-.B EEXIST
-.I pathname
-already exists (not necessarily as a directory).
-This includes the case where
-.I pathname
-is a symbolic link, dangling or not.
-.TP
-.B EFAULT
-.IR pathname " points outside your accessible address space."
-.TP
-.B EINVAL
-The final component ("basename") of the new directory's
-.I pathname
-is invalid
-(e.g., it contains characters not permitted by the underlying filesystem).
-.TP
-.B ELOOP
-Too many symbolic links were encountered in resolving
-.IR pathname .
-.TP
-.B EMLINK
-The number of links to the parent directory would exceed
-.BR LINK_MAX .
-.TP
-.B ENAMETOOLONG
-.IR pathname " was too long."
-.TP
-.B ENOENT
-A directory component in
-.I pathname
-does not exist or is a dangling symbolic link.
-.TP
-.B ENOMEM
-Insufficient kernel memory was available.
-.TP
-.B ENOSPC
-The device containing
-.I pathname
-has no room for the new directory.
-.TP
-.B ENOSPC
-The new directory cannot be created because the user's disk quota is
-exhausted.
-.TP
-.B ENOTDIR
-A component used as a directory in
-.I pathname
-is not, in fact, a directory.
-.TP
-.B ENOTDIR
-.RB ( mkdirat ())
-.I pathname
-is relative and
-.I dirfd
-is a file descriptor referring to a file other than a directory.
-.TP
-.B EPERM
-The filesystem containing
-.I pathname
-does not support the creation of directories.
-.TP
-.B EROFS
-.I pathname
-refers to a file on a read-only filesystem.
-.SH VERSIONS
-Under Linux, apart from the permission bits, the
-.B S_ISVTX
-.I mode
-bit is also honored.
-.SS glibc notes
-On older kernels where
-.BR mkdirat ()
-is unavailable, the glibc wrapper function falls back to the use of
-.BR mkdir ().
-When
-.I pathname
-is a relative pathname,
-glibc constructs a pathname based on the symbolic link in
-.I /proc/self/fd
-that corresponds to the
-.I dirfd
-argument.
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-.TP
-.BR mkdir ()
-SVr4, BSD, POSIX.1-2001.
-.\" SVr4 documents additional EIO, EMULTIHOP
-.TP
-.BR mkdirat ()
-Linux 2.6.16,
-glibc 2.4.
-.SH NOTES
-There are many infelicities in the protocol underlying NFS.
-Some of these affect
-.BR mkdir ().
-.SH SEE ALSO
-.BR mkdir (1),
-.BR chmod (2),
-.BR chown (2),
-.BR mknod (2),
-.BR mount (2),
-.BR rmdir (2),
-.BR stat (2),
-.BR umask (2),
-.BR unlink (2),
-.BR acl (5),
-.BR path_resolution (7)