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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 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_resolution(7)

COLOPHON

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