bsd/man/man2/mknod.2

   1 .\"     $NetBSD: mknod.2,v 1.6 1995/02/27 12:34:33 cgd Exp $
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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 <sys/stat.h>
  44 .Ft int
  45 .Fo mknod
  46 .Fa "const char *path"
  47 .Fa "mode_t mode"
  48 .Fa "dev_t dev"
  49 .Fc
  50 .Sh DESCRIPTION
  51 The device special file
  52 .Fa path
  53 is created with the major and minor
  54 device numbers extracted from
  55 .Fa mode .
  56 The access permissions of
  57 .Fa path
  58 are constrained by the
  59 .Xr umask 2
  60 of the parent process.
  61 .Pp
  62 If
  63 .Fa mode
  64 indicates a block or character special file,
  65 .Fa dev
  66 is a configuration-dependent specification of a character or block
  67 I/O device and the superblock of the device.  If
  68 .Fa mode
  69 does not indicate a block special or character special device,
  70 .Fa dev
  71 is ignored.
  72 .Pp
  73 .Fn Mknod
  74 requires super-user privileges.
  75 .Sh RETURN VALUES
  76 Upon successful completion, a value of 0 is returned.
  77 Otherwise, a value of -1 is returned and
  78 .Va errno
  79 is set to indicate the error.
  80 .Sh ERRORS
  81 .Fn Mknod
  82 will fail and the file will be not created if:
  83 .Bl -tag -width Er
  84 .\" ==========
  85 .It Bq Er EACCES
  86 Search permission is denied for a component of the path prefix.
  87 .\" ==========
  88 .It Bq Er EACCES
  89 Write permission is denied for the parent directory.
  90 .\" ==========
  91 .It Bq Er EDQUOT
  92 The directory in which the entry for the new node
  93 is being placed cannot be extended;
  94 the user's quota of disk blocks on the file system
  95 containing the directory has been exhausted.
  96 .\" ==========
  97 .It Bq Er EDQUOT
  98 The user's quota of inodes for the file system
  99 on which the node is being created has been exhausted.
 100 .\" ==========
 101 .It Bq Er EEXIST
 102 The named file exists.
 103 .\" ==========
 104 .It Bq Er EFAULT
 105 .Fa Path
 106 points outside the process's allocated address space.
 107 .\" ==========
 108 .It Bq Er EINVAL
 109 One or more of the arguments is invalid.
 110 .\" ==========
 111 .It Bq Er EIO
 112 An I/O error occurs while making the directory entry
 113 or allocating the inode.
 114 .\" ==========
 115 .It Bq Er ELOOP
 116 Too many symbolic links were encountered in translating the pathname.
 117 This is taken to be indicative of a looping symbolic link.
 118 .\" ==========
 119 .It Bq Er ENAMETOOLONG
 120 A component of a pathname exceeds
 121 .Dv {NAME_MAX}
 122 characters or an entire path name exceeds
 123 .Dv {PATH_MAX}
 124 characters.
 125 .\" ==========
 126 .It Bq Er ENOENT
 127 A component of the path prefix does not exist
 128 or path is an empty string.
 129 .\" ==========
 130 .It Bq Er ENOSPC
 131 The directory in which the entry for the new node is being placed
 132 cannot be extended,
 133 because there is no space left on the file system containing the directory.
 134 .\" ==========
 135 .It Bq Er ENOSPC
 136 There are no free inodes on the file system
 137 on which the node is being created.
 138 .\" ==========
 139 .It Bq Er ENOTDIR
 140 A component of the path prefix is not a directory.
 141 .\" ==========
 142 .It Bq Er EPERM
 143 The process's effective user ID is not super-user.
 144 .\" ==========
 145 .It Bq Er EROFS
 146 The created node would reside on a read-only file system.
 147 .El
 148 .Sh LEGACY SYNOPSIS
 149 .Fd #include <unistd.h>
 150 .Pp
 151 The include file has changed.
 152 .Sh SEE ALSO
 153 .Xr chmod 2 ,
 154 .Xr stat 2 ,
 155 .Xr umask 2 ,
 156 .Xr compat 5
 157 .Sh HISTORY
 158 A
 159 .Fn mknod
 160 function call appeared in
 161 .At v6 .