NAME

       mkdir, mkdirat — make a directory file

LIBRARY

       Standard C Library (libc, -lc)

SYNOPSIS

       #include <sys/stat.h>

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

       int
       mkdirat(int fd, const char *path, mode_t mode);

DESCRIPTION

       The  directory  path  is  created  with  the  access  permissions specified by mode and restricted by the
       umask(2) of the calling process.

       The directory's owner ID is set to the process's effective user ID.  The directory's group ID is  set  to
       that of the parent directory in which it is created.

       The  mkdirat()  system  call  is equivalent to mkdir() except in the case where path specifies a relative
       path.  In this case the newly created directory is created relative to the directory associated with  the
       file  descriptor  fd  instead of the current working directory.  If mkdirat() is passed the special value
       AT_FDCWD in the fd parameter, the current working directory is used and the behavior is  identical  to  a
       call to mkdir().

RETURN VALUES

       The mkdir() function returns the value 0 if successful; otherwise the value -1 is returned and the global
       variable errno is set to indicate the error.

ERRORS

       The mkdir() system call will fail and no directory will be created if:

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

       [ENAMETOOLONG]     A  component  of  a  pathname exceeded 255 characters, or an entire path name exceeded
                          1023 characters.

       [ENOENT]           A component of the path prefix does not exist.

       [EACCES]           Search permission is denied for a component of the path prefix, or write permission is
                          denied on the parent directory of the directory to be created.

       [ELOOP]            Too many symbolic links were encountered in translating the pathname.

       [EPERM]            The parent directory of the directory to be created has its immutable  flag  set,  see
                          the chflags(2) manual page for more information.

       [EROFS]            The named directory would reside on a read-only file system.

       [EMLINK]           The  new  directory  cannot  be created because the parent directory contains too many
                          subdirectories.

       [EEXIST]           The named file exists.

       [ENOSPC]           The new directory cannot be created because there is no space left on the file  system
                          that will contain the directory.

       [ENOSPC]           There are no free inodes on the file system on which the directory is being created.

       [EDQUOT]           The  new  directory  cannot  be created because the user's quota of disk blocks on the
                          file system that will contain the directory has been exhausted.

       [EDQUOT]           The user's quota of inodes on the file system on which the directory is being  created
                          has been exhausted.

       [EIO]              An I/O error occurred while making the directory entry or allocating the inode.

       [EIO]              An I/O error occurred while reading from or writing to the file system.

       [EINTEGRITY]       Corrupted data was detected while reading from the file system.

       [EFAULT]           The path argument points outside the process's allocated address space.

       In addition to the errors returned by the mkdir(), the mkdirat() may fail if:

       [EBADF]            The  path  argument  does  not specify an absolute path and the fd argument is neither
                          AT_FDCWD nor a valid file descriptor open for searching.

       [ENOTDIR]          The path argument is not an absolute path and  fd  is  neither  AT_FDCWD  nor  a  file
                          descriptor associated with a directory.

SEE ALSO

       chflags(2), chmod(2), stat(2), umask(2)

STANDARDS

       The  mkdir() system call is expected to conform to ISO/IEC 9945-1:1990 (“POSIX.1”).  The mkdirat() system
       call follows The Open Group Extended API Set 2 specification.

HISTORY

       The mkdirat() system call appeared in FreeBSD 8.0.  The mkdir() system call appeared in  Version  1  AT&T
       UNIX.

Debian                                           March 30, 2020                                         MKDIR(2)