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freebsd-dev/sys/compat/svr4/svr4_resource.c
John Baldwin 91d5354a2c Locking for the per-process resource limits structure. 
- struct plimit includes a mutex to protect a reference count.  The plimit
  structure is treated similarly to struct ucred in that is is always copy
  on write, so having a reference to a structure is sufficient to read from
  it without needing a further lock.
- The proc lock protects the p_limit pointer and must be held while reading
  limits from a process to keep the limit structure from changing out from
  under you while reading from it.
- Various global limits that are ints are not protected by a lock since
  int writes are atomic on all the archs we support and thus a lock
  wouldn't buy us anything.
- All accesses to individual resource limits from a process are abstracted
  behind a simple lim_rlimit(), lim_max(), and lim_cur() API that return
  either an rlimit, or the current or max individual limit of the specified
  resource from a process.
- dosetrlimit() was renamed to kern_setrlimit() to match existing style of
  other similar syscall helper functions.
- The alpha OSF/1 compat layer no longer calls getrlimit() and setrlimit()
  (it didn't used the stackgap when it should have) but uses lim_rlimit()
  and kern_setrlimit() instead.
- The svr4 compat no longer uses the stackgap for resource limits calls,
  but uses lim_rlimit() and kern_setrlimit() instead.
- The ibcs2 compat no longer uses the stackgap for resource limits.  It
  also no longer uses the stackgap for accessing sysctl's for the
  ibcs2_sysconf() syscall but uses kernel_sysctl() instead.  As a result,
  ibcs2_sysconf() no longer needs Giant.
- The p_rlimit macro no longer exists.

Submitted by:	mtm (mostly, I only did a few cleanups and catchups)
Tested on:	i386
Compiled on:	alpha, amd64
2004-02-04 21:52:57 +00:00

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/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 software have been derived from software contributed
* to the FreeBSD Project by Mark Newton.
*
* Copyright (c) 1999 Mark Newton
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*
* Derived from: $NetBSD: svr4_resource.c,v 1.3 1998/12/13 18:00:52 christos Exp $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/file.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/resource.h>
#include <sys/resourcevar.h>
#include <compat/svr4/svr4.h>
#include <compat/svr4/svr4_types.h>
#include <compat/svr4/svr4_resource.h>
#include <compat/svr4/svr4_signal.h>
#include <compat/svr4/svr4_proto.h>
#include <compat/svr4/svr4_util.h>
static __inline int svr4_to_native_rl(int);
static __inline int
svr4_to_native_rl(rl)
int rl;
{
switch (rl) {
case SVR4_RLIMIT_CPU:
return RLIMIT_CPU;
case SVR4_RLIMIT_FSIZE:
return RLIMIT_FSIZE;
case SVR4_RLIMIT_DATA:
return RLIMIT_DATA;
case SVR4_RLIMIT_STACK:
return RLIMIT_STACK;
case SVR4_RLIMIT_CORE:
return RLIMIT_CORE;
case SVR4_RLIMIT_NOFILE:
return RLIMIT_NOFILE;
case SVR4_RLIMIT_VMEM:
return RLIMIT_VMEM;
default:
return -1;
}
}
/*
* Check if the resource limit fits within the BSD range and it is not
* one of the magic SVR4 limit values
*/
#define OKLIMIT(l) (((int32_t)(l)) >= 0 && ((int32_t)(l)) < 0x7fffffff && \
((svr4_rlim_t)(l)) != SVR4_RLIM_INFINITY && \
((svr4_rlim_t)(l)) != SVR4_RLIM_SAVED_CUR && \
((svr4_rlim_t)(l)) != SVR4_RLIM_SAVED_MAX)
#define OKLIMIT64(l) (((rlim_t)(l)) >= 0 && ((rlim_t)(l)) < RLIM_INFINITY && \
((svr4_rlim64_t)(l)) != SVR4_RLIM64_INFINITY && \
((svr4_rlim64_t)(l)) != SVR4_RLIM64_SAVED_CUR && \
((svr4_rlim64_t)(l)) != SVR4_RLIM64_SAVED_MAX)
int
svr4_sys_getrlimit(td, uap)
register struct thread *td;
struct svr4_sys_getrlimit_args *uap;
{
int rl = svr4_to_native_rl(uap->which);
struct rlimit blim;
struct svr4_rlimit slim;
if (rl == -1)
return EINVAL;
PROC_LOCK(td->td_proc);
lim_rlimit(td->td_proc, rl, &blim);
PROC_UNLOCK(td->td_proc);
/*
* Our infinity, is their maxfiles.
*/
if (rl == RLIMIT_NOFILE && blim.rlim_max == RLIM_INFINITY)
blim.rlim_max = maxfiles;
/*
* If the limit can be be represented, it is returned.
* Otherwise, if rlim_cur == rlim_max, return RLIM_SAVED_MAX
* else return RLIM_SAVED_CUR
*/
if (blim.rlim_max == RLIM_INFINITY)
slim.rlim_max = SVR4_RLIM_INFINITY;
else if (OKLIMIT(blim.rlim_max))
slim.rlim_max = (svr4_rlim_t) blim.rlim_max;
else
slim.rlim_max = SVR4_RLIM_SAVED_MAX;
if (blim.rlim_cur == RLIM_INFINITY)
slim.rlim_cur = SVR4_RLIM_INFINITY;
else if (OKLIMIT(blim.rlim_cur))
slim.rlim_cur = (svr4_rlim_t) blim.rlim_cur;
else if (blim.rlim_max == blim.rlim_cur)
slim.rlim_cur = SVR4_RLIM_SAVED_MAX;
else
slim.rlim_cur = SVR4_RLIM_SAVED_CUR;
return copyout(&slim, uap->rlp, sizeof(*uap->rlp));
}
int
svr4_sys_setrlimit(td, uap)
register struct thread *td;
struct svr4_sys_setrlimit_args *uap;
{
int rl = svr4_to_native_rl(uap->which);
struct rlimit blim, curlim;
struct svr4_rlimit slim;
int error;
if (rl == -1)
return EINVAL;
if ((error = copyin(uap->rlp, &slim, sizeof(slim))) != 0)
return error;
PROC_LOCK(td->td_proc);
lim_rlimit(td->td_proc, rl, &curlim);
PROC_UNLOCK(td->td_proc);
/*
* if the limit is SVR4_RLIM_INFINITY, then we set it to our
* unlimited.
* We should also: If it is SVR4_RLIM_SAVED_MAX, we should set the
* new limit to the corresponding saved hard limit, and if
* it is equal to SVR4_RLIM_SAVED_CUR, we should set it to the
* corresponding saved soft limit.
*
*/
if (slim.rlim_max == SVR4_RLIM_INFINITY)
blim.rlim_max = RLIM_INFINITY;
else if (OKLIMIT(slim.rlim_max))
blim.rlim_max = (rlim_t) slim.rlim_max;
else if (slim.rlim_max == SVR4_RLIM_SAVED_MAX)
blim.rlim_max = curlim.rlim_max;
else if (slim.rlim_max == SVR4_RLIM_SAVED_CUR)
blim.rlim_max = curlim.rlim_cur;
if (slim.rlim_cur == SVR4_RLIM_INFINITY)
blim.rlim_cur = RLIM_INFINITY;
else if (OKLIMIT(slim.rlim_cur))
blim.rlim_cur = (rlim_t) slim.rlim_cur;
else if (slim.rlim_cur == SVR4_RLIM_SAVED_MAX)
blim.rlim_cur = curlim.rlim_max;
else if (slim.rlim_cur == SVR4_RLIM_SAVED_CUR)
blim.rlim_cur = curlim.rlim_cur;
return (kern_setrlimit(td, rl, &blim));
}
int
svr4_sys_getrlimit64(td, uap)
register struct thread *td;
struct svr4_sys_getrlimit64_args *uap;
{
int rl = svr4_to_native_rl(uap->which);
struct rlimit blim;
struct svr4_rlimit64 slim;
if (rl == -1)
return EINVAL;
PROC_LOCK(td->td_proc);
lim_rlimit(td->td_proc, rl, &blim);
PROC_UNLOCK(td->td_proc);
/*
* Our infinity, is their maxfiles.
*/
if (rl == RLIMIT_NOFILE && blim.rlim_max == RLIM_INFINITY)
blim.rlim_max = maxfiles;
/*
* If the limit can be be represented, it is returned.
* Otherwise, if rlim_cur == rlim_max, return SVR4_RLIM_SAVED_MAX
* else return SVR4_RLIM_SAVED_CUR
*/
if (blim.rlim_max == RLIM_INFINITY)
slim.rlim_max = SVR4_RLIM64_INFINITY;
else if (OKLIMIT64(blim.rlim_max))
slim.rlim_max = (svr4_rlim64_t) blim.rlim_max;
else
slim.rlim_max = SVR4_RLIM64_SAVED_MAX;
if (blim.rlim_cur == RLIM_INFINITY)
slim.rlim_cur = SVR4_RLIM64_INFINITY;
else if (OKLIMIT64(blim.rlim_cur))
slim.rlim_cur = (svr4_rlim64_t) blim.rlim_cur;
else if (blim.rlim_max == blim.rlim_cur)
slim.rlim_cur = SVR4_RLIM64_SAVED_MAX;
else
slim.rlim_cur = SVR4_RLIM64_SAVED_CUR;
return copyout(&slim, uap->rlp, sizeof(*uap->rlp));
}
int
svr4_sys_setrlimit64(td, uap)
register struct thread *td;
struct svr4_sys_setrlimit64_args *uap;
{
int rl = svr4_to_native_rl(uap->which);
struct rlimit blim, curlim;
struct svr4_rlimit64 slim;
int error;
if (rl == -1)
return EINVAL;
if ((error = copyin(uap->rlp, &slim, sizeof(slim))) != 0)
return error;
PROC_LOCK(td->td_proc);
lim_rlimit(td->td_proc, rl, &curlim);
PROC_UNLOCK(td->td_proc);
/*
* if the limit is SVR4_RLIM64_INFINITY, then we set it to our
* unlimited.
* We should also: If it is SVR4_RLIM64_SAVED_MAX, we should set the
* new limit to the corresponding saved hard limit, and if
* it is equal to SVR4_RLIM64_SAVED_CUR, we should set it to the
* corresponding saved soft limit.
*
*/
if (slim.rlim_max == SVR4_RLIM64_INFINITY)
blim.rlim_max = RLIM_INFINITY;
else if (OKLIMIT64(slim.rlim_max))
blim.rlim_max = (rlim_t) slim.rlim_max;
else if (slim.rlim_max == SVR4_RLIM64_SAVED_MAX)
blim.rlim_max = curlim.rlim_max;
else if (slim.rlim_max == SVR4_RLIM64_SAVED_CUR)
blim.rlim_max = curlim.rlim_cur;
if (slim.rlim_cur == SVR4_RLIM64_INFINITY)
blim.rlim_cur = RLIM_INFINITY;
else if (OKLIMIT64(slim.rlim_cur))
blim.rlim_cur = (rlim_t) slim.rlim_cur;
else if (slim.rlim_cur == SVR4_RLIM64_SAVED_MAX)
blim.rlim_cur = curlim.rlim_max;
else if (slim.rlim_cur == SVR4_RLIM64_SAVED_CUR)
blim.rlim_cur = curlim.rlim_cur;
return (kern_setrlimit(td, rl, &blim));
}
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