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Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)mkdir.2 8.2 (Berkeley) 12/11/93 29.\" $FreeBSD: src/lib/libc/sys/mkdir.2,v 1.28 2008/06/30 08:46:09 danger Exp $ 30.\" 31.Dd August 6, 2010 32.Dt MKDIR 2 33.Os 34.Sh NAME 35.Nm mkdir , 36.Nm mkdirat 37.Nd make a directory file 38.Sh LIBRARY 39.Lb libc 40.Sh SYNOPSIS 41.In sys/stat.h 42.Ft int 43.Fn mkdir "const char *path" "mode_t mode" 44.Ft int 45.Fn mkdirat "int fd" "const char *path" "mode_t mode" 46.Sh DESCRIPTION 47The directory 48.Fa path 49is created with the access permissions specified by 50.Fa mode 51and restricted by the 52.Xr umask 2 53of the calling process. 54.Pp 55The directory's owner ID is set to the process's effective user ID. 56The directory's group ID is set to that of the parent directory in 57which it is created. 58.Pp 59The 60.Fn mkdirat 61system call is equivalent to 62.Fn mkdir 63except in the case where 64.Fa path 65specifies a relative path. 66In this case the newly created directory is created relative to the 67directory associated with the file descriptor 68.Fa fd 69instead of the current working directory. 70If 71.Fn mkdirat 72is passed the special value 73.Dv AT_FDCWD 74in the 75.Fa fd 76parameter, the current working directory is used and the behavior is 77identical to a call to 78.Fn mkdir . 79.Sh RETURN VALUES 80.Rv -std mkdir 81.Sh ERRORS 82The 83.Fn mkdir 84system call 85will fail and no directory will be created if: 86.Bl -tag -width Er 87.It Bq Er ENOTDIR 88A component of the path prefix is not a directory. 89.It Bq Er ENAMETOOLONG 90A component of a pathname exceeded 255 characters, 91or an entire path name exceeded 1023 characters. 92.It Bq Er ENOENT 93A component of the path prefix does not exist. 94.It Bq Er EACCES 95Search permission is denied for a component of the path prefix, 96or write permission is denied 97on the parent directory of the directory to be created. 98.It Bq Er ELOOP 99Too many symbolic links were encountered in translating the pathname. 100.It Bq Er EPERM 101The parent directory of the directory to be created has its immutable flag set, 102see the 103.Xr chflags 2 104manual page for more information. 105.It Bq Er EROFS 106The named directory would reside on a read-only file system. 107.It Bq Er EMLINK 108The new directory cannot be created because the parent directory contains 109too many subdirectories. 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 130The 131.Fa path 132argument 133points outside the process's allocated address space. 134.El 135.Pp 136In addition to the errors returned by the 137.Fn mkdir , 138the 139.Fn mkdirat 140may fail if: 141.Bl -tag -width Er 142.It Bq Er EBADF 143The 144.Fa path 145argument does not specify an absolute path and the 146.Fa fd 147argument is neither 148.Dv AT_FDCWD 149nor a valid file descriptor open for searching. 150.It Bq Er ENOTDIR 151The 152.Fa path 153argument is not an absolute path and 154.Fa fd 155is neither 156.Dv AT_FDCWD 157nor a file descriptor associated with a directory. 158.El 159.Sh SEE ALSO 160.Xr chflags 2 , 161.Xr chmod 2 , 162.Xr stat 2 , 163.Xr umask 2 164.Sh STANDARDS 165The 166.Fn mkdir 167system call is expected to conform to 168.St -p1003.1-90 . 169The 170.Fn mkdirat 171system call follows The Open Group Extended API Set 2 specification. 172.Sh HISTORY 173The 174.Fn mkdirat 175system call appeared in 176.Dx 2.7 . 177