51 lines
1.3 KiB
Go
51 lines
1.3 KiB
Go
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//go:build linux
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package hcache
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/*
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* Copyright 2015 Albert P. Tobey <atobey@datastax.com> @AlTobey
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*
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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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*
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* pcstat.go - page cache stat
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*
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* uses the mincore(2) syscall to find out which pages (almost always 4k)
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* of a file are currently cached in memory
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*
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*/
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import (
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"log"
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"syscall"
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"unsafe"
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"golang.org/x/sys/unix"
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)
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// adapted from https://groups.google.com/d/msg/golang-nuts/8d4pOPmSL9Q/H6WUqbGNELEJ
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type winsize struct {
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ws_row, ws_col uint16
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ws_xpixel, ws_ypixel uint16
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}
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func getwinsize() winsize {
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ws := winsize{}
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_, _, err := unix.Syscall(syscall.SYS_IOCTL,
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uintptr(0), uintptr(syscall.TIOCGWINSZ),
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uintptr(unsafe.Pointer(&ws)))
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if err != 0 {
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log.Fatalf("TIOCGWINSZ failed to get terminal size: %s\n", err)
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}
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return ws
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}
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