bsd/man/man2/mknod.2

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  34 .\"     @(#)mknod.2     8.1 (Berkeley) 6/4/93
  35 .\"
  36 .Dd June 4, 1993
  37 .Dt MKNOD 2
  38 .Os BSD 4
  39 .Sh NAME
  40 .Nm mknod
  41 .Nd make a special file node
  42 .Sh SYNOPSIS
  43 .Fd #include <unistd.h>
  44 .Ft int
  45 .Fn mknod "const char *path" "mode_t mode" "dev_t dev"
  46 .Sh DESCRIPTION
  47 The device special file
  48 .Fa path
  49 is created with the major and minor
  50 device numbers extracted from
  51 .Fa mode.
  52 The access permissions of
  53 .Fa path
  54 are descendant from the
  55 .Xr umask 2
  56 of the parent process.
  57 .Pp
  58 If
  59 .Fa mode
  60 indicates a block or character special file,
  61 .Fa dev
  62 is a configuration dependent specification of a character or block
  63 I/O device and the superblock of the device.  If
  64 .Fa mode
  65 does not indicate a block special or character special device,
  66 .Fa dev
  67 is ignored.
  68 .Pp
  69 .Fn Mknod
  70 requires super-user privileges.
  71 .Sh RETURN VALUES
  72 Upon successful completion a value of 0 is returned.
  73 Otherwise, a value of -1 is returned and
  74 .Va errno
  75 is set to indicate the error.
  76 .Sh ERRORS
  77 .Fn Mknod
  78 will fail and the file will be not created if:
  79 .Bl -tag -width Er
  80 .It Bq Er ENOTDIR
  81 A component of the path prefix is not a directory.
  82 .It Bq Er ENAMETOOLONG
  83 A component of a pathname exceeded
  84 .Dv {NAME_MAX}
  85 characters, or an entire path name exceeded
  86 .Dv {PATH_MAX}
  87 characters.
  88 .It Bq Er ENOENT
  89 A component of the path prefix does not exist.
  90 .It Bq Er EACCES
  91 Search permission is denied for a component of the path prefix.
  92 .It Bq Er ELOOP
  93 Too many symbolic links were encountered in translating the pathname.
  94 .It Bq Er EPERM
  95 The process's effective user ID is not super-user.
  96 .It Bq Er EIO
  97 An I/O error occurred while making the directory entry or allocating the inode.
  98 .It Bq Er ENOSPC
  99 The directory in which the entry for the new node is being placed
 100 cannot be extended because there is no space left on the file
 101 system containing the directory.
 102 .It Bq Er ENOSPC
 103 There are no free inodes on the file system on which the
 104 node is being created.
 105 .It Bq Er EDQUOT
 106 The directory in which the entry for the new node
 107 is being placed cannot be extended because the
 108 user's quota of disk blocks on the file system
 109 containing the directory has been exhausted.
 110 .It Bq Er EDQUOT
 111 The user's quota of inodes on the file system on
 112 which the node is being created has been exhausted.
 113 .It Bq Er EROFS
 114 The named file resides on a read-only file system.
 115 .It Bq Er EEXIST
 116 The named file exists.
 117 .It Bq Er EFAULT
 118 .Fa Path
 119 points outside the process's allocated address space.
 120 .El
 121 .Sh SEE ALSO
 122 .Xr chmod 2 ,
 123 .Xr stat 2 ,
 124 .Xr umask 2
 125 .Sh HISTORY
 126 A
 127 .Fn mknod
 128 function call appeared in
 129 .At v6 .