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MKDIR(2)		   Linux Programmer's Manual		      MKDIR(2)

NAME
       mkdir - create a directory

SYNOPSIS
       #include <sys/stat.h>
       #include <sys/types.h>

       int mkdir(const char *pathname, mode_t mode);

DESCRIPTION
       mkdir() attempts to create a directory named pathname.

       The  argument mode specifies the permissions to use.  It is modified by
       the process's umask in the usual way: the permissions  of  the  created
       directory  are  (mode & ~umask & 0777).	Other mode bits of the created
       directory depend on the operating system.  For Linux, see 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 file system is  mounted  with	 BSD  group  semantics
       (mount -o bsdgroups or, 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.

RETURN VALUE
       mkdir() returns zero on success, or -1 if an error occurred  (in	 which
       case, errno is set appropriately).

ERRORS
       EACCES The  parent  directory  does  not	 allow write permission to the
	      process, or one of the directories in  pathname  did  not	 allow
	      search permission.  (See also path_resolution(7).)

       EEXIST pathname	already exists (not necessarily as a directory).  This
	      includes the case where pathname is 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 pathname does not exist or  is  a  dan‐
	      gling symbolic link.

       ENOMEM Insufficient kernel memory was available.

       ENOSPC The  device  containing  pathname has no room for the new direc‐
	      tory.

       ENOSPC The new directory cannot be  created  because  the  user's  disk
	      quota is exhausted.

       ENOTDIR
	      A	 component  used as a directory in pathname is not, in fact, a
	      directory.

       EPERM  The file system containing pathname does not  support  the  cre‐
	      ation of directories.

       EROFS  pathname refers to a file on a read-only file system.

CONFORMING TO
       SVr4, BSD, POSIX.1-2001.

NOTES
       Under  Linux  apart from the permission bits, only the S_ISVTX mode bit
       is honored.  That is, under Linux the created directory	actually  gets
       mode (mode & ~umask & 01777).  See also stat(2).

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

SEE ALSO
       mkdir(1), chmod(2), chown(2), mkdirat(2), mknod(2), mount(2), rmdir(2),
       stat(2), umask(2), unlink(2), path_resolution(7)

COLOPHON
       This  page  is  part of release 3.27 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux				  2010-06-26			      MKDIR(2)
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