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@(#)mknod.2 8.1 (Berkeley) 6/4/93
$FreeBSD: stable/10/lib/libc/sys/mknod.2 217484 2011-01-16 21:59:50Z jilles $
.Dd January 16, 2011 .Dt MKNOD 2 .Os .Sh NAME .Nm mknod , .Nm mknodat .Nd make a special file node .Sh LIBRARY .Lb libc .Sh SYNOPSIS n sys/stat.h .Ft int .Fn mknod "const char *path" "mode_t mode" "dev_t dev" .Ft int .Fn mknodat "int fd" "const char *path" "mode_t mode" "dev_t dev" .Sh DESCRIPTION The file system node .Fa path is created with the file type and access permissions specified in .Fa mode . The access permissions are modified by the process's umask value.
p If .Fa mode indicates a block or character special file, .Fa dev is a configuration dependent specification denoting a particular device on the system. Otherwise, .Fa dev is ignored.
p The .Fn mknod system call requires super-user privileges.
p The .Fn mknodat system call is equivalent to .Fn mknod except in the case where .Fa path specifies a relative path. In this case the newly created device node is created relative to the directory associated with the file descriptor .Fa fd instead of the current working directory. If .Fn mknodat is passed the special value .Dv AT_FDCWD in the .Fa fd parameter, the current working directory is used and the behavior is identical to a call to .Fn mknod . .Sh RETURN VALUES .Rv -std mknod .Sh ERRORS The .Fn mknod system call will fail and the file will be not created if: l -tag -width Er t Bq Er ENOTDIR A component of the path prefix is not a directory. t Bq Er ENAMETOOLONG A component of a pathname exceeded 255 characters, or an entire path name exceeded 1023 characters. t Bq Er ENOENT A component of the path prefix does not exist. t Bq Er EACCES Search permission is denied for a component of the path prefix. t Bq Er ELOOP Too many symbolic links were encountered in translating the pathname. t Bq Er EPERM The process's effective user ID is not super-user. t Bq Er EIO An I/O error occurred while making the directory entry or allocating the inode. t Bq Er 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 directory. t Bq Er ENOSPC There are no free inodes on the file system on which the node is being created. t Bq Er 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. t Bq Er EDQUOT The user's quota of inodes on the file system on which the node is being created has been exhausted. t Bq Er EROFS The named file resides on a read-only file system. t Bq Er EEXIST The named file exists. t Bq Er EFAULT The .Fa path argument points outside the process's allocated address space. t Bq Er EINVAL Creating anything else than a block or character special file (or a .Em whiteout ) is not supported. .El
p In addition to the errors returned by the .Fn mknod , the .Fn mknodat may fail if: l -tag -width Er t Bq Er EBADF The .Fa path argument does not specify an absolute path and the .Fa fd argument is neither .Dv AT_FDCWD nor a valid file descriptor open for searching. t Bq Er ENOTDIR The .Fa path argument is not an absolute path and .Fa fd is neither .Dv AT_FDCWD nor a file descriptor associated with a directory. .El .Sh SEE ALSO .Xr chmod 2 , .Xr mkfifo 2 , .Xr stat 2 , .Xr umask 2 .Sh STANDARDS The .Fn mknodat system call follows The Open Group Extended API Set 2 specification. .Sh HISTORY The .Fn mknod function appeared in .At v6 . The .Fn mknodat system call appeared in .Fx 8.0 .