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// Copyright 2017 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.
// +build !nomeminfo
// +build freebsd dragonfly
#include <fcntl.h>
#include <kvm.h>
#include <limits.h>
#include <paths.h>
#include <stdlib.h>
int _kvm_swap_used_pages(uint64_t *out) {
const int total_only = 1; // from kvm_getswapinfo(3)
kvm_t *kd;
struct kvm_swap current;
kd = kvm_open(NULL, _PATH_DEVNULL, NULL, O_RDONLY, NULL);
if (kd == NULL) {
return -1;
}
if (kvm_getswapinfo(kd, ¤t, total_only, 0) == -1) {
goto error1;
}
if (kvm_close(kd) != 0) {
return -1;
}
kd = NULL;
*out = current.ksw_used;
return 0;
error1:
if (kd != NULL) {
kvm_close(kd);
}
return -1;
}
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