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mkdir(2)
NAME
  mkdir - Creates a directory

SYNOPSIS
  #include <sys/stat.h>

  #include <sys/types.h>

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

STANDARDS
  Interfaces documented on this reference page conform to industry standards
  as follows:

  mkdir(): XSH5.0

  Refer to the standards(5) reference page for more information about
  industry standards and associated tags.

PARAMETERS
  path	    Specifies the name of the new directory.

	    [Tru64 UNIX]  If NFS is installed on your system, this path can
	    cross into another node.  In this case, the new directory is
	    created at that node.  If the final component of the path
	    parameter refers to a symbolic link, the link is traversed and
	    pathname resolution continues.

  mode	    Specifies the mask for the read, write, and execute (RWX) flags
	    for owner, group, and others.

DESCRIPTION
  The mkdir() function creates a new directory with the following attributes:

    ·  The owner ID is set to the process's effective user ID.

    ·  The group ID is set to the group ID of its parent directory.

       [Tru64 UNIX]  However, if the sys_v_mode tunable is set, then the
       group ID of the file is set to the effective group ID of the process.
       With exception, if the S_ISGID bit of the parent directory is set, the
       group ID of the file is set to the group ID of the parent directory
       and its S_ISGID bit is set.

       If the group ID of the new file does not match the effective group of
       the process or one of the supplementary group IDs of the process, the
       S_ISGID bit of the new file is cleared.

    ·  Permission and attribute bits are set according to the value of the
       mode parameter modified by the process's file creation mask (see the
       umask() function).  This parameter is constructed by logically ORing
       values described in the sys/mode.h header file.

    ·  The new directory is empty, except for . (dot) and .. (dot-dot).

  To execute the mkdir() function, a process must have search permission to
  get to the parent directory of the path parameter and write permission in
  the parent directory of the path parameter with respect to all of the
  system's configured access control policies.

  Upon successful completion, the mkdir() function marks the st_atime,
  st_ctime, and st_mtime fields of the directory for update, and marks the
  st_ctime and st_mtime fields of the new directory's parent directory for
  update.

RETURN VALUES
  Upon successful completion, the mkdir() function returns a value of 0
  (zero). If the mkdir() function fails, a value of -1 is returned, and errno
  is set to indicate the error.

ERRORS
  If the mkdir() function fails, the directory is not created and errno may
  be set to one of the following values:

  [EACCES]  Creating the requested directory requires writing in a directory
	    with a mode that denies write permission, or search permission is
	    denied on the parent directory of the directory to be created.
	    The process does not have write access to the parent directory
	    with respect to one of the system's access policies.

  [EDQUOT]  The directory in which the entry for the new link is being placed
	    cannot be extended because the user's quota of disk blocks or i-
	    nodes on the file system containing the directory is exhausted.

  [EEXIST]  The named file already exists.

  [EFAULT]  The path parameter is an invalid address.

  [EINVAL]  The owner or group ID is not a value that is supported by this
	    implementation.

  [EIO]	    A physical I/O error has occurred.

  [ELOOP]   Too many links were encountered in translating path.

  [EMLINK]  The link count of the parent directory would exceed LINK_MAX.

  [ENAMETOOLONG]
	    The length of the path parameter exceeds PATH_MAX or a pathname
	    component is longer than NAME_MAX.

  [ENOENT]  A component of the path parameter does not exist or points to an
	    empty string.

  [ENOMEM]  Unable to allocate a directory buffer.

  [ENOSPC]  The file system does not contain enough space to hold the
	    contents of the new directory or to extend the parent directory
	    of the new directory.

  [ENOTDIR] A component of the path prefix is not a directory.

  [EROFS]   The named file resides on a read-only file system.

  [Tru64 UNIX]	For NFS file access, if the mkdir() function fails, errno may
  also be set to one of the following values:

  [ENFILE]  Indicates either that the system file table is full, or that
	    there are too many files currently open in the system.

  [ESTALE]  Indicates a stale NFS file handle.	A client cannot make a
	    directory because the server has unmounted or unexported the
	    remote directory.

RELATED INFORMATION
  Commands: chmod(1), mkdir(1), mknod(8)

  Functions: chmod(2), mknod(2), rmdir(2), umask(2)

  Standards: standards(5)

Index for Section 2

Alphabetical listing for M

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