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       mkdir - create a directory


       #include <sys/stat.h>
       #include <sys/types.h>

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


       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.


       mkdir() returns zero on success, or -1 if an error occurred  (in  which
       case, errno is set appropriately).


       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

       EFAULT pathname points outside your accessible address space.

       ELOOP  Too  many symbolic links were encountered in resolving pathname.

              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

       ENOSPC The new directory cannot be  created  because  the  user’s  disk
              quota is exhausted.

              A  component  used as a directory in pathname is not, in fact, a

       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.


       SVr4, BSD, POSIX.1-2001.


       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().


       mkdir(1), chmod(2), chown(2), mkdirat(2), mknod(2), mount(2), rmdir(2),
       stat(2), umask(2), unlink(2), path_resolution(7)


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