mirror of
https://github.com/containers/podman.git
synced 2025-12-08 06:39:05 +08:00
60a74088fa
When running podman top, the processes collected can exit befor psgo gets information on the processes. This can cause some weird errors and creates some CI flakes. psgo now properly ignores this situation rather then returning errors Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
82 lines
1.8 KiB
Go
82 lines
1.8 KiB
Go
// Copyright 2018 psgo authors
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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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// Package host extracts data from the host, such as the system's boot time or
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// the tick rate of the system clock.
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package host
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import (
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"bufio"
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"fmt"
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"os"
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"strconv"
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"strings"
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)
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/*
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#include <unistd.h>
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*/
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import "C"
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var (
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// cache host queries to redundant calculations
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clockTicks *int64
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bootTime *int64
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)
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// ClockTicks returns sysconf(SC_CLK_TCK).
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func ClockTicks() int64 {
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if clockTicks == nil {
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ticks := int64(C.sysconf(C._SC_CLK_TCK))
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clockTicks = &ticks
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}
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return *clockTicks
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}
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// BootTime parses /proc/uptime returns the boot time in seconds since the
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// Epoch, 1970-01-01 00:00:00 +0000 (UTC).
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func BootTime() (int64, error) {
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if bootTime != nil {
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return *bootTime, nil
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}
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f, err := os.Open("/proc/stat")
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if err != nil {
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return 0, err
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}
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btimeStr := ""
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scanner := bufio.NewScanner(f)
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for scanner.Scan() {
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fields := strings.Fields(scanner.Text())
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if len(fields) < 2 {
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continue
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}
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if fields[0] == "btime" {
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btimeStr = fields[1]
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}
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}
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if len(btimeStr) == 0 {
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return 0, fmt.Errorf("couldn't extract boot time from /proc/stat")
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}
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btimeSec, err := strconv.ParseInt(btimeStr, 10, 64)
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if err != nil {
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return 0, fmt.Errorf("error parsing boot time from /proc/stat: %s", err)
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}
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bootTime = &btimeSec
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return btimeSec, nil
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}
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