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mknod - make a special file node

 

NAME

      mknod - make a special file node
 

LIBRARY

      Standard C Library (libc, -lc)
 

SYNOPSIS

      #include <unistd.h>
 
      int
      mknod(const char *path, mode_t mode, dev_t dev);
 

DESCRIPTION

      The file system node path is created with the file type and access per‐
      missions specified in mode.  The access permissions are modified by the
      process’s umask value.
 
      If mode indicates a block or character special file, dev is a configura‐
      tion dependent specification denoting a particular device on the system.
      Otherwise, dev is ignored.
 
      The mknod() system call requires super-user privileges.
      The mknod() 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 mknod() system call will fail and the file will be not 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.
 
      [ELOOP]            Too many symbolic links were encountered in translat‐
                         ing the pathname.
 
      [EPERM]            The process’s effective user ID is not super-user.
 
      [EIO]              An I/O error occurred while making the directory entry
                         or allocating the inode.
 
      [ENOSPC]           The directory in which the entry for the new node is
                         being placed cannot be extended because there is no
                         space left on the file system containing the direc‐
                         tory.
 
      [ENOSPC]           There are no free inodes on the file system on which
                         the node is being created.
 
      [EDQUOT]           The directory in which the entry for the new node is
                         being placed cannot be extended because the user’s
                         quota of disk blocks on the file system containing the
                         directory has been exhausted.
 
      [EDQUOT]           The user’s quota of inodes on the file system on which
                         the node is being created has been exhausted.
 
      [EROFS]            The named file resides on a read-only file system.
 
      [EEXIST]           The named file exists.
 
      [EFAULT]           The path argument points outside the process’s allo‐
                         cated address space.
 
      [EINVAL]           Creating anything else than a block or character spe‐
                         cial file (or a whiteout) is not supported.
      chmod(2), mkfifo(2), stat(2), umask(2)
 

HISTORY

      The mknod() function appeared in Version 6 AT&T UNIX.
 

Sections

Based on BSD UNIX
FreeBSD is an advanced operating system for x86 compatible (including Pentium and Athlon), amd64 compatible (including Opteron, Athlon64, and EM64T), UltraSPARC, IA-64, PC-98 and ARM architectures. It is derived from BSD, the version of UNIX developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.