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mkdir.html
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<!-- Creator : groff version 1.22.4 -->
<!-- CreationDate: Wed Jan 29 11:26:52 2020 -->
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta name="generator" content="groff -Thtml, see www.gnu.org">
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<meta name="Content-Style" content="text/css">
<style type="text/css">
p { margin-top: 0; margin-bottom: 0; vertical-align: top }
pre { margin-top: 0; margin-bottom: 0; vertical-align: top }
table { margin-top: 0; margin-bottom: 0; vertical-align: top }
h1 { text-align: center }
</style>
<title>MKDIR</title>
</head>
<body>
<h1 align="center">MKDIR</h1>
<a href="#NAME">NAME</a><br>
<a href="#SYNOPSIS">SYNOPSIS</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#RETURN VALUE">RETURN VALUE</a><br>
<a href="#ERRORS">ERRORS</a><br>
<a href="#VERSIONS">VERSIONS</a><br>
<a href="#CONFORMING TO">CONFORMING TO</a><br>
<a href="#NOTES">NOTES</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
<a href="#COLOPHON">COLOPHON</a><br>
<hr>
<h2>NAME
<a name="NAME"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">mkdir, mkdirat
- create a directory</p>
<h2>SYNOPSIS
<a name="SYNOPSIS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>#include
<sys/stat.h> <br>
#include <sys/types.h></b></p>
<p style="margin-left:11%; margin-top: 1em"><b>int
mkdir(const char *</b><i>pathname</i><b>, mode_t</b>
<i>mode</i><b>);</b></p>
<p style="margin-left:11%; margin-top: 1em"><b>#include
<fcntl.h></b> /* Definition of AT_* constants */
<b><br>
#include <sys/stat.h></b></p>
<p style="margin-left:11%; margin-top: 1em"><b>int
mkdirat(int</b> <i>dirfd</i><b>, const char
*</b><i>pathname</i><b>, mode_t</b> <i>mode</i><b>);</b></p>
<p style="margin-left:5%; margin-top: 1em">Feature Test
Macro Requirements for glibc (see
<b>feature_test_macros</b>(7)):</p>
<p style="margin-left:11%; margin-top: 1em"><b>mkdirat</b>():</p>
<p style="margin-left:17%;">Since glibc 2.10:</p>
<p style="margin-left:23%;">_POSIX_C_SOURCE >= 200809L</p>
<p style="margin-left:17%;">Before glibc 2.10:</p>
<p style="margin-left:23%;">_ATFILE_SOURCE</p>
<h2>DESCRIPTION
<a name="DESCRIPTION"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>mkdir</b>()
attempts to create a directory named <i>pathname</i>.</p>
<p style="margin-left:11%; margin-top: 1em">The argument
<i>mode</i> specifies the mode for the new directory (see
<b>inode</b>(7)). It is modified by the process’s
<i>umask</i> in the usual way: in the absence of a default
ACL, the mode of the created directory is (<i>mode</i> &
~<i>umask</i> & 0777). Whether other <i>mode</i> bits
are honored for the created directory depends on the
operating system. For Linux, see NOTES below.</p>
<p style="margin-left:11%; margin-top: 1em">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 (<i>mount -o bsdgroups</i> or,
synonymously <i>mount -o grpid</i>), 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>
<p style="margin-left:11%; margin-top: 1em">If the parent
directory has the set-group-ID bit set, then so will the
newly created directory.</p>
<p style="margin-left:11%; margin-top: 1em"><b>mkdirat()</b>
<br>
The <b>mkdirat</b>() system call operates in exactly the
same way as <b>mkdir</b>(), except for the differences
described here.</p>
<p style="margin-left:11%; margin-top: 1em">If the pathname
given in <i>pathname</i> is relative, then it is interpreted
relative to the directory referred to by the file descriptor
<i>dirfd</i> (rather than relative to the current working
directory of the calling process, as is done by
<b>mkdir</b>() for a relative pathname).</p>
<p style="margin-left:11%; margin-top: 1em">If
<i>pathname</i> is relative and <i>dirfd</i> is the special
value <b>AT_FDCWD</b>, then <i>pathname</i> is interpreted
relative to the current working directory of the calling
process (like <b>mkdir</b>()).</p>
<p style="margin-left:11%; margin-top: 1em">If
<i>pathname</i> is absolute, then <i>dirfd</i> is
ignored.</p>
<p style="margin-left:11%; margin-top: 1em">See
<b>openat</b>(2) for an explanation of the need for
<b>mkdirat</b>().</p>
<h2>RETURN VALUE
<a name="RETURN VALUE"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>mkdir</b>()
and <b>mkdirat</b>() return zero on success, or -1 if an
error occurred (in which case, <i>errno</i> is set
appropriately).</p>
<h2>ERRORS
<a name="ERRORS"></a>
</h2>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="9%">
<p style="margin-top: 1em"><b>EACCES</b></p></td>
<td width="2%"></td>
<td width="78%">
<p style="margin-top: 1em">The parent directory does not
allow write permission to the process, or one of the
directories in <i>pathname</i> did not allow search
permission. (See also <b>path_resolution</b>(7).)</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="9%">
<p><b>EDQUOT</b></p></td>
<td width="2%"></td>
<td width="78%">
<p>The user’s quota of disk blocks or inodes on the
filesystem has been exhausted.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="9%">
<p><b>EEXIST</b></p></td>
<td width="2%"></td>
<td width="78%">
<p><i>pathname</i> already exists (not necessarily as a
directory). This includes the case where <i>pathname</i> is
a symbolic link, dangling or not.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="9%">
<p><b>EFAULT</b></p></td>
<td width="2%"></td>
<td width="78%">
<p><i>pathname</i> points outside your accessible address
space.</p> </td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="9%">
<p><b>EINVAL</b></p></td>
<td width="2%"></td>
<td width="78%">
<p>The final component ("basename") of the new
directory’s <i>pathname</i> is invalid (e.g., it
contains characters not permitted by the underlying
filesystem).</p> </td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="9%">
<p><b>ELOOP</b></p></td>
<td width="2%"></td>
<td width="78%">
<p>Too many symbolic links were encountered in resolving
<i>pathname</i>.</p> </td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="9%">
<p><b>EMLINK</b></p></td>
<td width="2%"></td>
<td width="78%">
<p>The number of links to the parent directory would exceed
<b>LINK_MAX</b>.</p> </td></tr>
</table>
<p style="margin-left:11%;"><b>ENAMETOOLONG</b></p>
<p style="margin-left:22%;"><i>pathname</i> was too
long.</p>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="9%">
<p><b>ENOENT</b></p></td>
<td width="2%"></td>
<td width="78%">
<p>A directory component in <i>pathname</i> does not exist
or is a dangling symbolic link.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="9%">
<p><b>ENOMEM</b></p></td>
<td width="2%"></td>
<td width="78%">
<p>Insufficient kernel memory was available.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="9%">
<p><b>ENOSPC</b></p></td>
<td width="2%"></td>
<td width="78%">
<p>The device containing <i>pathname</i> has no room for
the new directory.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="9%">
<p><b>ENOSPC</b></p></td>
<td width="2%"></td>
<td width="78%">
<p>The new directory cannot be created because the
user’s disk quota is exhausted.</p></td></tr>
</table>
<p style="margin-left:11%;"><b>ENOTDIR</b></p>
<p style="margin-left:22%;">A component used as a directory
in <i>pathname</i> is not, in fact, a directory.</p>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>EPERM</b></p></td>
<td width="4%"></td>
<td width="78%">
<p>The filesystem containing <i>pathname</i> does not
support the creation of directories.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p><b>EROFS</b></p></td>
<td width="4%"></td>
<td width="78%">
<p><i>pathname</i> refers to a file on a read-only
filesystem.</p> </td></tr>
</table>
<p style="margin-left:11%; margin-top: 1em">The following
additional errors can occur for <b>mkdirat</b>():</p>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="7%">
<p style="margin-top: 1em"><b>EBADF</b></p></td>
<td width="4%"></td>
<td width="56%">
<p style="margin-top: 1em"><i>dirfd</i> is not a valid file
descriptor.</p> </td>
<td width="22%">
</td></tr>
</table>
<p style="margin-left:11%;"><b>ENOTDIR</b></p>
<p style="margin-left:22%;"><i>pathname</i> is relative and
<i>dirfd</i> is a file descriptor referring to a file other
than a directory.</p>
<h2>VERSIONS
<a name="VERSIONS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>mkdirat</b>()
was added to Linux in kernel 2.6.16; library support was
added to glibc in version 2.4.</p>
<h2>CONFORMING TO
<a name="CONFORMING TO"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>mkdir</b>():
SVr4, BSD, POSIX.1-2001, POSIX.1-2008.</p>
<p style="margin-left:11%; margin-top: 1em"><b>mkdirat</b>():
POSIX.1-2008.</p>
<h2>NOTES
<a name="NOTES"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">Under Linux,
apart from the permission bits, the <b>S_ISVTX</b>
<i>mode</i> bit is also honored.</p>
<p style="margin-left:11%; margin-top: 1em">There are many
infelicities in the protocol underlying NFS. Some of these
affect <b>mkdir</b>().</p>
<p style="margin-left:11%; margin-top: 1em"><b>Glibc
notes</b> <br>
On older kernels where <b>mkdirat</b>() is unavailable, the
glibc wrapper function falls back to the use of
<b>mkdir</b>(). When <i>pathname</i> is a relative pathname,
glibc constructs a pathname based on the symbolic link in
<i>/proc/self/fd</i> that corresponds to the <i>dirfd</i>
argument.</p>
<h2>SEE ALSO
<a name="SEE ALSO"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>mkdir</b>(1),
<b>chmod</b>(2), <b>chown</b>(2), <b>mknod</b>(2),
<b>mount</b>(2), <b>rmdir</b>(2), <b>stat</b>(2),
<b>umask</b>(2), <b>unlink</b>(2), <b>acl</b>(5)
<b>path_resolution</b>(7)</p>
<h2>COLOPHON
<a name="COLOPHON"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">This page is
part of release 5.02 of the Linux <i>man-pages</i> 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/.</p>
<hr>
</body>
</html>