ab137c90f7
the *at system calls on November 18th of last year. Reasons to revert
it include:
- it is incorrect in a whole variety of ways (but fortunately, one
of them is that the missing and improper permission checks have
no net effect);
- it was committed without review or discussion;
- core ruled that all the new O_* flags pertaining to the *at calls
needed to wait until their semantics could be clarified.
manu was asked to revert it on these grounds but has ignored the request.
I have left O_SEARCH defined and visible and made open() explicitly
ignore it. This way, most code that tries to use it will continue to
build and run. I've also arranged lib/libc/c063/t_o_search.c so that
the tests that make use of the O_SEARCH semantics will disappear until
O_SEARCH comes back, and fixed some mistakes and/or incorrect hacks
that were causing some of these to succeed despite the broken O_SEARCH
implementation.
151 lines
4.7 KiB
Groff
151 lines
4.7 KiB
Groff
.\" $NetBSD: mkfifo.2,v 1.25 2013/01/13 08:15:02 dholland Exp $
|
|
.\"
|
|
.\" Copyright (c) 1990, 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.
|
|
.\"
|
|
.\" @(#)mkfifo.2 8.1 (Berkeley) 6/4/93
|
|
.\"
|
|
.Dd November 18, 2012
|
|
.Dt MKFIFO 2
|
|
.Os
|
|
.Sh NAME
|
|
.Nm mkfifo ,
|
|
.Nm mkfifoat
|
|
.Nd make a fifo file
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In sys/stat.h
|
|
.Ft int
|
|
.Fn mkfifo "const char *path" "mode_t mode"
|
|
.Ft int
|
|
.Fn mkfifoat "int fd" "const char *path" "mode_t mode"
|
|
.Sh DESCRIPTION
|
|
.Fn mkfifo
|
|
creates a new fifo file with name
|
|
.Fa path .
|
|
The access permissions are
|
|
specified by
|
|
.Fa mode
|
|
and restricted by the
|
|
.Xr umask 2
|
|
of the calling process.
|
|
.Pp
|
|
.Fn mkfifoat
|
|
works the same way as
|
|
.Fn mkfifo
|
|
except if
|
|
.Fa path
|
|
is relative.
|
|
In that case, it is looked up from a directory whose file
|
|
descriptor was passed as
|
|
.Fa fd .
|
|
Search permission is required on this directory.
|
|
.\" (These alternatives await a decision about the semantics of O_SEARCH)
|
|
.\" Search permission is required on this directory
|
|
.\" except if
|
|
.\" .Fa fd
|
|
.\" was opened with the
|
|
.\" .Dv O_SEARCH
|
|
.\" flag.
|
|
.\" - or -
|
|
.\" This file descriptor must have been opened with the
|
|
.\" .Dv O_SEARCH
|
|
.\" flag.
|
|
.Fa fd
|
|
can be set to
|
|
.Dv AT_FDCWD
|
|
in order to specify the current directory.
|
|
.Pp
|
|
The fifo's owner ID is set to the process's effective user ID.
|
|
The fifo's group ID is set to that of the parent directory in
|
|
which it is created.
|
|
.Sh RETURN VALUES
|
|
A 0 return value indicates success.
|
|
A \-1 return value indicates an error, and an error code is stored in
|
|
.Va errno .
|
|
.Sh ERRORS
|
|
.Fn mkfifo
|
|
will fail and no fifo will be created if:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EACCES
|
|
Search permission is denied for a component of the path prefix.
|
|
.It Bq Er EDQUOT
|
|
The directory in which the entry for the new fifo
|
|
is being placed cannot be extended because the
|
|
user's quota of disk blocks on the file system
|
|
containing the directory has been exhausted.
|
|
Or, the user's quota of inodes on the file system on
|
|
which the fifo is being created has been exhausted.
|
|
.It Bq Er EEXIST
|
|
The named file exists.
|
|
.It Bq Er EFAULT
|
|
.Fa path
|
|
points outside the process's allocated address space.
|
|
.It Bq Er EIO
|
|
An
|
|
.Tn I/O
|
|
error occurred while making the directory entry or allocating the inode.
|
|
Or, an
|
|
.Tn I/O
|
|
error occurred while reading from or writing to the file system.
|
|
.It Bq Er ELOOP
|
|
Too many symbolic links were encountered in translating the pathname.
|
|
.It Bq Er ENAMETOOLONG
|
|
A component of a pathname exceeded
|
|
.Brq Dv NAME_MAX
|
|
characters, or an entire path name exceeded
|
|
.Brq Dv PATH_MAX
|
|
characters.
|
|
.It Bq Er ENOENT
|
|
A component of the path prefix does not exist.
|
|
.It Bq Er ENOSPC
|
|
The directory in which the entry for the new fifo is being placed
|
|
cannot be extended because there is no space left on the file
|
|
system containing the directory.
|
|
Or, there are no free inodes on the file system on which the
|
|
fifo is being created.
|
|
.It Bq Er ENOTDIR
|
|
A component of the path prefix is not a directory.
|
|
.It Bq Er EOPNOTSUPP
|
|
The kernel has not been configured to support fifo's.
|
|
.It Bq Er EROFS
|
|
The named file resides on a read-only file system.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr chmod 2 ,
|
|
.Xr stat 2 ,
|
|
.Xr umask 2
|
|
.Sh STANDARDS
|
|
The
|
|
.Nm mkfifo
|
|
function call conforms to
|
|
.St -p1003.1-90 .
|
|
.Fn mkfifoat
|
|
conforms to
|
|
.St -p1003.1-2008 .
|