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// Copyright 2024 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build darwin && !ios && cgo
#include <mach/mach_init.h>
#include <mach/task.h>
#include <mach/mach_vm.h>
// The compiler warns that mach/shared_memory_server.h is deprecated, and to use
// mach/shared_region.h instead. But that doesn't define
// SHARED_DATA_REGION_SIZE or SHARED_TEXT_REGION_SIZE, so redefine them here and
// avoid a warning message when running tests.
#define GLOBAL_SHARED_TEXT_SEGMENT 0x90000000U
#define SHARED_DATA_REGION_SIZE 0x10000000
#define SHARED_TEXT_REGION_SIZE 0x10000000
int get_memory_info(unsigned long long *rss, unsigned long long *vsize)
{
// This is lightly adapted from how ps(1) obtains its memory info.
// https://github.com/apple-oss-distributions/adv_cmds/blob/8744084ea0ff41ca4bb96b0f9c22407d0e48e9b7/ps/tasks.c#L109
kern_return_t error;
task_t task = MACH_PORT_NULL;
mach_task_basic_info_data_t info;
mach_msg_type_number_t info_count = MACH_TASK_BASIC_INFO_COUNT;
error = task_info(
mach_task_self(),
MACH_TASK_BASIC_INFO,
(task_info_t) &info,
&info_count );
if( error != KERN_SUCCESS )
{
return error;
}
*rss = info.resident_size;
*vsize = info.virtual_size;
{
vm_region_basic_info_data_64_t b_info;
mach_vm_address_t address = GLOBAL_SHARED_TEXT_SEGMENT;
mach_vm_size_t size;
mach_port_t object_name;
/*
* try to determine if this task has the split libraries
* mapped in... if so, adjust its virtual size down by
* the 2 segments that are used for split libraries
*/
info_count = VM_REGION_BASIC_INFO_COUNT_64;
error = mach_vm_region(
mach_task_self(),
&address,
&size,
VM_REGION_BASIC_INFO_64,
(vm_region_info_t) &b_info,
&info_count,
&object_name);
if (error == KERN_SUCCESS) {
if (b_info.reserved && size == (SHARED_TEXT_REGION_SIZE) &&
*vsize > (SHARED_TEXT_REGION_SIZE + SHARED_DATA_REGION_SIZE)) {
*vsize -= (SHARED_TEXT_REGION_SIZE + SHARED_DATA_REGION_SIZE);
}
}
}
return 0;
}
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