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802b0eba51
Check for VM limit RPCs
* config.h.in: add #undef for HAVE_MACH_VM_GET_SIZE_LIMIT and
HAVE_MACH_VM_SET_SIZE_LIMIT.
* sysdeps/mach/configure.ac: use mach_RPC_CHECK to check for
vm_set_size_limit and vm_get_size_limit RPCs in gnumach.defs.
* sysdeps/mach/configure: regenerate file.
Use vm_get_size_limit to initialize RLIMIT_AS
* hurd/hurdrlimit.c(init_rlimit): use vm_get_size_limit to initialize
RLIMIT_AS entry of the _hurd_rlimits array.
Notify the kernel of the new VM size limits
* sysdeps/mach/hurd/setrlimit.c: use the vm_set_size_limit RPC,
if available, to notify the kernel of the new limits. Retry RPC
calls if they were interrupted by a signal.
Message-ID: <03fb90a795b354a366ee73f56f73e6ad22a86cda.1755220108.git.dnietoc@gmail.com>
101 lines
2.9 KiB
C
101 lines
2.9 KiB
C
/* Copyright (C) 1991-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <hurd.h>
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#include <hurd/fd.h>
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#include <hurd/resource.h>
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/* Set the soft and hard limits for RESOURCE to *RLIMITS.
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Only the super-user can increase hard limits.
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Return 0 if successful, -1 if not (and sets errno). */
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int
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__setrlimit (enum __rlimit_resource resource, const struct rlimit *rlimits)
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{
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struct rlimit lim;
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error_t err = 0;
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mach_port_t host = MACH_PORT_NULL;
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if (rlimits == NULL || (unsigned int) resource >= RLIMIT_NLIMITS)
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return __hurd_fail (EINVAL);
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lim = *rlimits;
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/* Even though most limits do nothing, there is no inheritance, and hard
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limits are not really hard, we just let any old call succeed to make
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life easier for programs that expect normal behavior. */
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if (lim.rlim_cur > lim.rlim_max)
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lim.rlim_cur = lim.rlim_max;
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retry:
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HURD_CRITICAL_BEGIN;
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__mutex_lock (&_hurd_rlimit_lock);
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#ifdef HAVE_MACH_VM_SET_SIZE_LIMIT
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if (resource == RLIMIT_AS)
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{
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if (host == MACH_PORT_NULL)
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{
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/* Check whether the privileged host control port is required */
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if (_hurd_rlimits[resource].rlim_max < lim.rlim_max)
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{
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err = __get_privileged_ports (&host, NULL);
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if (err)
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goto fail;
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}
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else
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host = __mach_host_self ();
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}
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err = __vm_set_size_limit (host, __mach_task_self (),
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lim.rlim_cur, lim.rlim_max);
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if (err == MIG_BAD_ID)
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/* MIG_BAD_ID returned as kernel support is missing, clear error */
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err = 0;
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else if (err)
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{
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if (err == KERN_NO_ACCESS)
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err = EPERM;
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goto fail;
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}
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}
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#endif
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_hurd_rlimits[resource] = lim;
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#ifdef HAVE_MACH_VM_SET_SIZE_LIMIT
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fail:
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#endif
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__mutex_unlock (&_hurd_rlimit_lock);
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HURD_CRITICAL_END;
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if (err == EINTR)
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/* Got a signal while inside an RPC of the critical section, retry */
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goto retry;
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if (host != MACH_PORT_NULL && host != __mach_host_self ())
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__mach_port_deallocate (__mach_task_self (), host);
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return __hurd_fail (err);
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}
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libc_hidden_def (__setrlimit)
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weak_alias (__setrlimit, setrlimit)
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