mirror of
https://github.com/freebsd/freebsd-src
synced 2024-07-09 04:36:31 +00:00
8269e7673c
Remove core system call implementations and documentation to lib/libsys and lib/libsys/<arch> from lib/libc/sys and lib/libc/<arch>/<sys>. Update paths to allow libc to find them in their new home. Reviewed by: kib, emaste, imp Pull Request: https://github.com/freebsd/freebsd-src/pull/908
182 lines
5.1 KiB
Groff
182 lines
5.1 KiB
Groff
.\" Copyright (c) 1980, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.Dd March 30, 2020
|
|
.Dt MKNOD 2
|
|
.Os
|
|
.Sh NAME
|
|
.Nm mknod ,
|
|
.Nm mknodat
|
|
.Nd make a special file node
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In 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.
|
|
.Pp
|
|
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.
|
|
.Pp
|
|
The
|
|
.Fn mknod
|
|
system call
|
|
requires super-user privileges.
|
|
.Pp
|
|
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:
|
|
.Bl -tag -width Er
|
|
.It Bq Er ENOTDIR
|
|
A component of the path prefix is not a directory.
|
|
.It Bq Er ENAMETOOLONG
|
|
A component of a pathname exceeded 255 characters,
|
|
or an entire path name exceeded 1023 characters.
|
|
.It Bq Er ENOENT
|
|
A component of the path prefix does not exist.
|
|
.It Bq Er EACCES
|
|
Search permission is denied for a component of the path prefix.
|
|
.It Bq Er ELOOP
|
|
Too many symbolic links were encountered in translating the pathname.
|
|
.It Bq Er EPERM
|
|
The process's effective user ID is not super-user.
|
|
.It Bq Er EIO
|
|
An I/O error occurred while making the directory entry or allocating the inode.
|
|
.It Bq Er EINTEGRITY
|
|
Corrupted data was detected while reading from the file system.
|
|
.It 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.
|
|
.It Bq Er ENOSPC
|
|
There are no free inodes on the file system on which the
|
|
node is being created.
|
|
.It 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.
|
|
.It Bq Er EDQUOT
|
|
The user's quota of inodes on the file system on
|
|
which the node is being created has been exhausted.
|
|
.It Bq Er EROFS
|
|
The named file resides on a read-only file system.
|
|
.It Bq Er EEXIST
|
|
The named file exists.
|
|
.It Bq Er EFAULT
|
|
The
|
|
.Fa path
|
|
argument
|
|
points outside the process's allocated address space.
|
|
.It Bq Er EINVAL
|
|
Creating anything else than a block or character special
|
|
file (or a
|
|
.Em whiteout )
|
|
is not supported.
|
|
.El
|
|
.Pp
|
|
In addition to the errors returned by the
|
|
.Fn mknod ,
|
|
the
|
|
.Fn mknodat
|
|
may fail if:
|
|
.Bl -tag -width Er
|
|
.It 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.
|
|
.It 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 v4 .
|
|
The
|
|
.Fn mknodat
|
|
system call appeared in
|
|
.Fx 8.0 .
|