.\" $NetBSD: mkdir.2,v 1.29.28.1 2019/09/05 08:19:40 martin Exp $ .\" .\" Copyright (c) 1983, 1991, 1993 .\" The Regents of the University of California. All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" @(#)mkdir.2 8.2 (Berkeley) 12/11/93 .\" .Dd September 1, 2019 .Dt MKDIR 2 .Os .Sh NAME .Nm mkdir , .Nm mkdirat .Nd make a directory file .Sh LIBRARY .Lb libc .Sh SYNOPSIS .In sys/stat.h .Ft int .Fn mkdir "const char *path" "mode_t mode" .In sys/stat.h .In fcntl.h .Ft int .Fn mkdirat "int fd" "const char *path" "mode_t mode" .Sh DESCRIPTION The directory .Fa path is created with the access permissions specified by .Fa mode and restricted by the .Xr umask 2 of the calling process. .Pp .Fn mkdirat works the same way as .Fn mkdir except if .Fa path is relative. In that case, it is looked up from a directory whose file descriptor was passed as .Fa fd . Search permission is required this directory. .\" (These alternatives await a decision about the semantics of O_SEARCH) .\" Search permission is required on this directory .\" except if .\" .Fa fd .\" was opened with the .\" .Dv O_SEARCH .\" flag. .\" - or - .\" This file descriptor must have been opened with the .\" .Dv O_SEARCH .\" flag. .Fa fd can be set to .Dv AT_FDCWD in order to specify the current directory. .Pp The directory's owner ID is set to the process's effective user ID. The directory's group ID is set to that of the parent directory in which it is created. .Sh RETURN VALUES .Rv -std mkdir mkdirat .Sh ERRORS Both .Fn mkdir and .Fn mkdirat will fail and no directory will be created if: .Bl -tag -width Er .It Bq Er EACCES Search permission is denied for a component of the path prefix. .It Bq Er EDQUOT The new directory cannot be created because the user's quota of disk blocks on the file system that will contain the directory has been exhausted. Or, the user's quota of inodes on the file system on which the directory is being created has been exhausted. .It Bq Er EEXIST The named file exists. .It Bq Er EFAULT .Fa path points outside the process's allocated address space. .It Bq Er EIO An I/O error occurred while making the directory entry or allocating the inode; or an I/O error occurred while reading from or writing to the file system. .It Bq Er ELOOP Too many symbolic links were encountered in translating the pathname. .It Bq Er ENAMETOOLONG A component of a pathname exceeded .Brq Dv NAME_MAX characters, or an entire path name exceeded .Brq Dv PATH_MAX characters. .It Bq Er ENOENT A component of the path prefix does not exist. .It Bq Er ENOSPC The new directory cannot be created because there is no space left on the file system that will contain the directory. Or, there are no free inodes on the file system on which the directory is being created. .It Bq Er ENOTDIR A component of the path prefix is not a directory. .It Bq Er EROFS The named file resides on a read-only file system. .El .Pp In addition, .Fn mkdirat will fail if: .Bl -tag -width Er .It Bq Er EBADF .Fa path does not specify an absolute path and .Fa fd is neither .Dv AT_FDCWD nor a valid file descriptor open for reading or searching. .It Bq Er ENOTDIR .Fa path is not an absolute path and .Fa fd is a file descriptor associated with a non-directory file. .El .Sh SEE ALSO .Xr chmod 2 , .Xr stat 2 , .Xr umask 2 .Sh STANDARDS The .Fn mkdir function conforms to .St -p1003.1-90 . .Fn mkdirat conforms to .St -p1003.1-2008 . .Sh HISTORY The .Fn mkdir function appeared in .At v1 .