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mkdir.2 revision 1.25 
 $NetBSD: mkdir.2,v 1.25 2012/11/18 17:41:53 manu Exp $

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 @(#)mkdir.2 8.2 (Berkeley) 12/11/93

.Dd December 27, 2005
.Dt MKDIR 2
.Os
.Sh NAME
.Nm mkdir ,
.Nm mkdirat
.Nd make a directory file
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
n sys/stat.h .Ft int
.Fn mkdir "const char *path" "mode_t mode"
.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.

p
.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 on
.Fa fd
except if that file descriptor was open with
.Dv O_SEARCH
option.
.Fa fd
can be set to
.Dv AT_FDCWD
in order to specify current directory.

p
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
A 0 return value indicates success.
A -1 return value indicates an error, and an error code is stored in
.Va errno .
.Sh ERRORS
.Fn mkdir
will fail and no directory will be created if:
l -tag -width Er t Bq Er ENOTDIR A component of the path prefix is not a directory.
t Bq Er ENAMETOOLONG A component of a pathname exceeded
rq Dv NAME_MAX characters, or an entire path name exceeded
rq Dv PATH_MAX characters.
t Bq Er ENOENT A component of the path prefix does not exist.
t Bq Er EACCES Search permission is denied for a component of the path prefix.
t Bq Er ELOOP Too many symbolic links were encountered in translating the pathname.
t Bq Er EROFS The named file resides on a read-only file system.
t Bq Er EEXIST The named file exists.
t Bq Er ENOSPC The new directory cannot be created because there is no space left
on the file system that will contain the directory.
t Bq Er ENOSPC There are no free inodes on the file system on which the
directory is being created.
t 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.
t Bq Er EDQUOT The user's quota of inodes on the file system on
which the directory is being created has been exhausted.
t Bq Er EIO An I/O error occurred while making the directory entry or allocating the inode.
t Bq Er EIO An I/O error occurred while reading from or writing to the file system.
t Bq Er EFAULT .Fa path
points outside the process's allocated address space.
.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 .