| MKNOD(2) | System Calls Manual | MKNOD(2) | 
mknod, mknodat —
#include <sys/stat.h>
int
  
  mknod(const
    char *path, mode_t
    mode, dev_t
  dev);
#include
    <sys/stat.h>
  
  #include <fcntl.h>
int
  
  mknodat(int
    fd, const char
    *path, mode_t mode,
    dev_t dev);
mknod with S_IFIFO specified in
  mode and 0 in dev makes a FIFO
  file. This call is respectively a portable alias for
  mkfifo(2) and
  mkfifoat(2).
mknod with S_IFCHR
    or S_IFBLK in mode makes a
    device special file. The file path is created with the
    major and minor device numbers specified by dev. The
    access permissions of path are extracted from
    mode, modified by the
    umask(2) of the parent
  process.
mknodat() works the same way as
    mknod() except if path is
    relative. In that case, it is looked up from a directory whose file
    descriptor was passed as fd. Search permission is
    required on this directory. fd can be set to
    AT_FDCWD in order to specify the current
  directory.
mknod() requires super-user privileges for
    creating device special files.
mknod() and mknodat()
  functions return the value 0 if successful; otherwise the
  value -1 is returned and the global variable
  errno is set to indicate the error.
mknod() and mknodat() will fail
  and the file will be not created if:
EACCES]EDQUOT]EEXIST]EFAULT]EINVAL]EIO]ELOOP]ENAMETOOLONG]NAME_MAX}
      characters, or an entire path name exceeded
      {PATH_MAX} characters.ENOENT]ENOSPC]ENOTDIR]EOPNOTSUPP]EPERM]EROFS]In addition, mknodat() will fail if:
mknod() function conforms to IEEE
  Std 1003.1-1990 (“POSIX.1”).
  mknodat() conforms to IEEE Std
  1003.1-2008 (“POSIX.1”).
mknod() function call appeared in
  Version 6 AT&T UNIX.
The alias mode for mkfifo(2) and mkfifoat(2) first appeared in NetBSD 9.
| June 20, 2019 | NetBSD 10.0 |