mkdir(2) System Calls Manual 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
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. 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 per-
mission 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: 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. 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. The named file already exists. The path parameter is an invalid
address. The owner or group ID is not a value that is supported by this implementation. A physical I/O error has occurred. Too many
links were encountered in translating path. The link count of the parent directory would exceed LINK_MAX. The length of the path parame-
ter exceeds PATH_MAX or a pathname component is longer than NAME_MAX. A component of the path parameter does not exist or points to an
empty string. Unable to allocate a directory buffer. The file system does not contain enough space to hold the contents of the new direc-
tory or to extend the parent directory of the new directory. A component of the path prefix is not a directory. 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: Indicates either
that the system file table is full, or that there are too many files currently open in the system. 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) delim off
mkdir(2)