1.\" $OpenBSD: mkdir.2,v 1.10 2011/07/18 23:04:40 matthew Exp $ 2.\" $NetBSD: mkdir.2,v 1.8 1995/02/27 12:34:22 cgd Exp $ 3.\" 4.\" Copyright (c) 1983, 1991, 1993 5.\" The Regents of the University of California. All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" @(#)mkdir.2 8.2 (Berkeley) 12/11/93 32.\" 33.Dd $Mdocdate: July 18 2011 $ 34.Dt MKDIR 2 35.Os 36.Sh NAME 37.Nm mkdir , 38.Nm mkdirat 39.Nd make a directory file 40.Sh SYNOPSIS 41.Fd #include <sys/types.h> 42.Fd #include <sys/stat.h> 43.Fd #include <fcntl.h> 44.Ft int 45.Fn mkdir "const char *path" "mode_t mode" 46.Ft int 47.Fn mkdirat "int fd" "const char *path" "mode_t mode" 48.Sh DESCRIPTION 49The directory 50.Fa path 51is created with the access permissions specified by 52.Fa mode 53and restricted by the 54.Xr umask 2 55of the calling process. 56.Pp 57The directory's owner ID is set to the process's effective user ID. 58The directory's group ID is set to that of the parent directory in 59which it is created. 60.Pp 61The 62.Fn mkdirat 63function is equivalent to 64.Fn mkdir 65except that where 66.Fa path 67specifies a relative path, 68the newly created directory is created relative to 69the directory associated with file descriptor 70.Fa fd 71instead of the current working directory. 72.Pp 73If 74.Fn mkdirat 75is passed the special value 76.Dv AT_FDCWD 77(defined in 78.In fcntl.h ) 79in the 80.Fa fd 81parameter, the current working directory is used 82and the behavior is identical to a call to 83.Fn mkdir . 84.Sh RETURN VALUES 85A 0 return value indicates success. 86A \-1 return value indicates an error, and an error code is stored in 87.Va errno . 88.Sh ERRORS 89.Fn mkdir 90and 91.Fn mkdirat 92will fail and no directory will be created if: 93.Bl -tag -width Er 94.It Bq Er ENOTDIR 95A component of the path prefix is not a directory. 96.It Bq Er ENAMETOOLONG 97A component of a pathname exceeded 98.Dv {NAME_MAX} 99characters, or an entire path name exceeded 100.Dv {PATH_MAX} 101characters. 102.It Bq Er ENOENT 103A component of the path prefix does not exist. 104.It Bq Er EACCES 105Search permission is denied for a component of the path prefix. 106.It Bq Er ELOOP 107Too many symbolic links were encountered in translating the pathname. 108.It Bq Er EROFS 109The named file resides on a read-only file system. 110.It Bq Er EEXIST 111The named file exists. 112.It Bq Er ENOSPC 113The new directory cannot be created because there is no space left 114on the file system that will contain the directory. 115.It Bq Er ENOSPC 116There are no free inodes on the file system on which the 117directory is being created. 118.It Bq Er EDQUOT 119The new directory cannot be created because the user's 120quota of disk blocks on the file system that will 121contain the directory has been exhausted. 122.It Bq Er EDQUOT 123The user's quota of inodes on the file system on 124which the directory is being created has been exhausted. 125.It Bq Er EIO 126An I/O error occurred while making the directory entry or allocating the inode. 127.It Bq Er EIO 128An I/O error occurred while reading from or writing to the file system. 129.It Bq Er EFAULT 130.Fa path 131points outside the process's allocated address space. 132.El 133.Pp 134Additionally, 135.Fn mkdirat 136will fail if: 137.Bl -tag -width Er 138.It Bq Er EBADF 139The 140.Fa path 141argument does not specify an absolute path and the 142.Fa fd 143argument is neither 144.Dv AT_FDCWD 145nor a valid file descriptor open for reading. 146.El 147.Sh SEE ALSO 148.Xr chmod 2 , 149.Xr stat 2 , 150.Xr umask 2 151.Sh STANDARDS 152The 153.Fn mkdir 154and 155.Fn mkdirat 156functions conform to 157.St -p1003.1-2008 . 158.Sh HISTORY 159The 160.Fn mkdirat 161function appeared in 162.Ox 5.0 . 163