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477fe4665a
* Move FreeBSD/DragonflyBSD out of meminfo add kvm. This gives us SwapUsed, and everything under one roof. * Fix typos per review. * Update to use newer API. * Remove premature optimization per PR feedback.
53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
// Copyright 2017 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build !nomeminfo
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// +build freebsd dragonfly
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#include <fcntl.h>
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#include <kvm.h>
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#include <limits.h>
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#include <paths.h>
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#include <stdlib.h>
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int _kvm_swap_used_pages(uint64_t *out) {
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const int total_only = 1; // from kvm_getswapinfo(3)
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kvm_t *kd;
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struct kvm_swap current;
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kd = kvm_open(NULL, _PATH_DEVNULL, NULL, O_RDONLY, NULL);
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if (kd == NULL) {
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return -1;
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}
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if (kvm_getswapinfo(kd, ¤t, total_only, 0) == -1) {
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goto error1;
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}
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if (kvm_close(kd) != 0) {
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return -1;
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}
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kd = NULL;
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*out = current.ksw_used;
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return 0;
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error1:
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if (kd != NULL) {
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kvm_close(kd);
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}
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return -1;
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}
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