1.\" $NetBSD: mkdir.2,v 1.27 2013/01/13 08:15:02 dholland Exp $ 2.\" 3.\" Copyright (c) 1983, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" @(#)mkdir.2 8.2 (Berkeley) 12/11/93 31.\" 32.Dd November 18, 2012 33.Dt MKDIR 2 34.Os 35.Sh NAME 36.Nm mkdir , 37.Nm mkdirat 38.Nd make a directory file 39.Sh LIBRARY 40.Lb libc 41.Sh SYNOPSIS 42.In sys/stat.h 43.Ft int 44.Fn mkdir "const char *path" "mode_t mode" 45.Ft int 46.Fn mkdirat "int fd" "const char *path" "mode_t mode" 47.Sh DESCRIPTION 48The directory 49.Fa path 50is created with the access permissions specified by 51.Fa mode 52and restricted by the 53.Xr umask 2 54of the calling process. 55.Pp 56.Fn mkdirat 57works the same way as 58.Fn mkdir 59except if 60.Fa path 61is relative. 62In that case, it is looked up from a directory whose file 63descriptor was passed as 64.Fa fd . 65Search permission is required this directory. 66.\" (These alternatives await a decision about the semantics of O_SEARCH) 67.\" Search permission is required on this directory 68.\" except if 69.\" .Fa fd 70.\" was opened with the 71.\" .Dv O_SEARCH 72.\" flag. 73.\" - or - 74.\" This file descriptor must have been opened with the 75.\" .Dv O_SEARCH 76.\" flag. 77.Fa fd 78can be set to 79.Dv AT_FDCWD 80in order to specify the current directory. 81.Pp 82The directory's owner ID is set to the process's effective user ID. 83The directory's group ID is set to that of the parent directory in 84which it is created. 85.Sh RETURN VALUES 86A 0 return value indicates success. 87A \-1 return value indicates an error, and an error code is stored in 88.Va errno . 89.Sh ERRORS 90.Fn mkdir 91will fail and no directory will be created if: 92.Bl -tag -width Er 93.It Bq Er EACCES 94Search permission is denied for a component of the path prefix. 95.It Bq Er EDQUOT 96The new directory cannot be created because the user's 97quota of disk blocks on the file system that will 98contain the directory has been exhausted. 99Or, the user's quota of inodes on the file system on 100which the directory is being created has been exhausted. 101.It Bq Er EEXIST 102The named file exists. 103.It Bq Er EFAULT 104.Fa path 105points outside the process's allocated address space. 106.It Bq Er EIO 107An I/O error occurred while making the directory entry or allocating the inode; 108or an I/O error occurred while reading from or writing to the file system. 109.It Bq Er ELOOP 110Too many symbolic links were encountered in translating the pathname. 111.It Bq Er ENAMETOOLONG 112A component of a pathname exceeded 113.Brq Dv NAME_MAX 114characters, or an entire path name exceeded 115.Brq Dv PATH_MAX 116characters. 117.It Bq Er ENOENT 118A component of the path prefix does not exist. 119.It Bq Er ENOSPC 120The new directory cannot be created because there is no space left 121on the file system that will contain the directory. 122Or, there are no free inodes on the file system on which the 123directory is being created. 124.It Bq Er ENOTDIR 125A component of the path prefix is not a directory. 126.It Bq Er EROFS 127The named file resides on a read-only file system. 128.El 129.Sh SEE ALSO 130.Xr chmod 2 , 131.Xr stat 2 , 132.Xr umask 2 133.Sh STANDARDS 134The 135.Fn mkdir 136function conforms to 137.St -p1003.1-90 . 138.Fn mkdirat 139conforms to 140.St -p1003.1-2008 . 141