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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 bsd-
       groups  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  path-
              name 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.

       ENAMETOOLONG
              pathname was too long.

       ENOENT A directory component in pathname does not exist or is a dangling symbolic link.

       ENOMEM Insufficient kernel memory was available.

       ENOSPC The device containing pathname has 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 pathname is not, in fact, a directory.

       EPERM  The file system containing pathname does not support the creation 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_res-
       olution(7)

COLOPHON
       This page is part of release 3.22 of the Linux man-pages project.  A description of the project,  and  informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                             2008-05-13                          MKDIR(2)