Return to posix_spawn_file_actions_init.3 CVS log

Up to [cvs.NetBSD.org] / src / lib / libc / gen

Pull up the following revisions(s) (requested by martin in ticket #1023):
	lib/libc/gen/posix_spawn.3:			revision 1.5
	lib/libc/gen/posix_spawn_file_actions_addopen.3:	revision 1.4
	lib/libc/gen/posix_spawn_file_actions_init.3:	revision 1.4
	lib/libc/gen/posix_spawn_fileactions.c:		revision 1.3
	sys/compat/netbsd32/netbsd32_execve.c:		revision 1.38
	sys/kern/kern_exec.c:				revision 1.373

Limit the amount of kernel memory a posix_spawn syscall can use (for
handling the file action list) by limiting the maximum number of file
actions to twice the current file descriptor limit. Fix a few bugs in
the support functions and document the new limit. From Maxime Villard.

.\" $NetBSD: posix_spawn_file_actions_init.3,v 1.1.8.1 2014/02/03 11:57:24 sborrill Exp $
.\"
.\" Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
.\" 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.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
.\"
.\" Portions of this text are reprinted and reproduced in electronic form
.\" from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
.\" Portable Operating System Interface (POSIX), The Open Group Base
.\" Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
.\" Electrical and Electronics Engineers, Inc and The Open Group.  In the
.\" event of any discrepancy between this version and the original IEEE and
.\" The Open Group Standard, the original IEEE and The Open Group Standard is
.\" the referee document.  The original Standard can be obtained online at
.\"	http://www.opengroup.org/unix/online.html.
.\"
.\" $FreeBSD: src/lib/libc/gen/posix_spawn_file_actions_init.3,v 1.1.2.1.4.1 2010/06/14 02:09:06 kensmith Exp $
.\"
.Dd December 20, 2011
.Dt POSIX_SPAWN_FILE_ACTIONS_INIT 3
.Os
.Sh NAME
.Nm posix_spawn_file_actions_init ,
.Nm posix_spawn_file_actions_destroy
.Nd "initialize and destroy spawn file actions object"
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In spawn.h
.Ft int
.Fn posix_spawn_file_actions_init "posix_spawn_file_actions_t * file_actions"
.Ft int
.Fn posix_spawn_file_actions_destroy "posix_spawn_file_actions_t * file_actions"
.Sh DESCRIPTION
The
.Fn posix_spawn_file_actions_init
function initialize the object referenced by
.Fn file_actions
to contain no file actions for
.Fn posix_spawn
or
.Fn posix_spawnp .
Initializing an already initialized spawn file actions object may cause
memory to be leaked.
.Pp
The
.Fn posix_spawn_file_actions_destroy
function destroy the object referenced by
.Fa file_actions ;
the object becomes, in effect, uninitialized.
A destroyed spawn file actions object can be reinitialized using
.Fn posix_spawn_file_actions_init .
The object should not be used after it has been destroyed.
.Sh RETURN VALUES
Upon successful completion, these functions return zero;
otherwise, an error number is returned to indicate the error.
.Sh ERRORS
The
.Fn posix_spawn_file_actions_init
function will fail if:
.Bl -tag -width Er
.It Bq Er ENOMEM
Insufficient memory exists to initialize the spawn file actions object.
.It Bq Er EINVAL
The value specified by
.Fa file_actions
is invalid.
.El
.Sh SEE ALSO
.Xr posix_spawn 3 ,
.Xr posix_spawn_file_actions_addclose 3 ,
.Xr posix_spawn_file_actions_adddup2 3 ,
.Xr posix_spawn_file_actions_addopen 3 ,
.Xr posix_spawnp 3
.Sh STANDARDS
The
.Fn posix_spawn_file_actions_init
and
.Fn posix_spawn_file_actions_destroy
functions conform to
.St -p1003.1-2001 .
.Sh HISTORY
The
.Fn posix_spawn_file_actions_init
and
.Fn posix_spawn_file_actions_destroy
functions first appeared in
.Fx 8.0
and imported for
.Nx 6 .
.Sh AUTHORS
.An Ed Schouten Aq ed@FreeBSD.org