Manpage of MKDIR

MKDIR

Section: Linux Programmer's Manual (2)
Updated: 2016-03-15
Index
 

NAME

mkdir, mkdirat - create a directory  

SYNOPSIS

#include <sys/stat.h>#include <sys/types.h>int mkdir(const char *pathname, mode_t mode);#include <fcntl.h>           /* Definition of AT_* constants */
#include <sys/stat.h>int mkdirat(int dirfd, const char *pathname, mode_t mode);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

mkdirat():

Since glibc 2.10:
_POSIX_C_SOURCE >= 200809L
Before glibc 2.10:
_ATFILE_SOURCE
 

DESCRIPTION

mkdir() attempts to create a directory named pathname.

The argument modespecifies the mode for the new directory (see stat(2)). It is modified by the process's umaskin the usual way: in the absence of a default ACL, the mode of the created directory is (mode & ~umask & 0777). Whether other modebits are honored for the created directory depends on the operating system. For Linux, see NOTES below.

The newly created directory will be owned by the effective user ID of the process. If the directory containing the file has the set-group-ID bit set, or if the filesystem is mounted with BSD group semantics (mount -o bsdgroupsor, synonymously mount -o grpid), the new directory will inherit the group ownership from its parent; otherwise it will be owned by the effective group ID of the process.

If the parent directory has the set-group-ID bit set, then so will the newly created directory.  

mkdirat()

The mkdirat() system call operates in exactly the same way as mkdir(), except for the differences described here.

If the pathname given in pathnameis relative, then it is interpreted relative to the directory referred to by the file descriptor dirfd(rather than relative to the current working directory of the calling process, as is done by mkdir() for a relative pathname).

If pathnameis relative and dirfdis the special value AT_FDCWD, then pathnameis interpreted relative to the current working directory of the calling process (like mkdir()).

If pathnameis absolute, then dirfdis ignored.

See openat(2) for an explanation of the need for mkdirat().  

RETURN VALUE

mkdir() and mkdirat() return zero on success, or -1 if an error occurred (in which case, errnois set appropriately).  

ERRORS

EACCES
The parent directory does not allow write permission to the process, or one of the directories in pathnamedid not allow search permission. (See also path_resolution(7).)
EDQUOT
The user's quota of disk blocks or inodes on the filesystem has been exhausted.
EEXIST
pathnamealready exists (not necessarily as a directory). This includes the case where pathnameis a symbolic link, dangling or not.
EFAULT
pathname points outside your accessible address space.
ELOOP
Too many symbolic links were encountered in resolving pathname.
EMLINK
The number of links to the parent directory would exceed LINK_MAX.
ENAMETOOLONG
pathname was too long.
ENOENT
A directory component in pathnamedoes not exist or is a dangling symbolic link.
ENOMEM
Insufficient kernel memory was available.
ENOSPC
The device containing pathnamehas no room for the new directory.
ENOSPC
The new directory cannot be created because the user's disk quota is exhausted.
ENOTDIR
A component used as a directory in pathnameis not, in fact, a directory.
EPERM
The filesystem containing pathnamedoes not support the creation of directories.
EROFS
pathnamerefers to a file on a read-only filesystem.

The following additional errors can occur for mkdirat():

EBADF
dirfdis not a valid file descriptor.
ENOTDIR
pathnameis relative and dirfdis a file descriptor referring to a file other than a directory.
 

VERSIONS

mkdirat() was added to Linux in kernel 2.6.16; library support was added to glibc in version 2.4.  

CONFORMING TO

mkdir(): SVr4, BSD, POSIX.1-2001, POSIX.1-2008.

mkdirat(): POSIX.1-2008.  

NOTES

Under Linux, apart from the permission bits, the S_ISVTXmodebit is also honored.

There are many infelicities in the protocol underlying NFS. Some of these affect mkdir().  

Glibc notes

On older kernels where mkdirat() is unavailable, the glibc wrapper function falls back to the use of mkdir(). When pathnameis a relative pathname, glibc constructs a pathname based on the symbolic link in /proc/self/fdthat corresponds to the dirfdargument.  

SEE ALSO

mkdir(1), chmod(2), chown(2), mknod(2), mount(2), rmdir(2), stat(2), umask(2), unlink(2), acl(5) path_resolution(7)


 

Index

NAME
SYNOPSIS
DESCRIPTION
mkdirat()
RETURN VALUE
ERRORS
VERSIONS
CONFORMING TO
NOTES
Glibc notes
SEE ALSO

This document was created by man2html, using the manual pages.
Time: 22:27:44 GMT, June 20, 2016 Click Here!