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Original file line number | Diff line number | Diff line change |
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// +build linux | ||
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package libcontainer | ||
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import ( | ||
"io/ioutil" | ||
"path/filepath" | ||
"strconv" | ||
"strings" | ||
"unsafe" | ||
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"github.com/pkg/errors" | ||
"github.com/sirupsen/logrus" | ||
"golang.org/x/sys/unix" | ||
) | ||
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func getValueFromCgroup(path, key string) (int, error) { | ||
content, err := ioutil.ReadFile(path) | ||
if err != nil { | ||
return 0, err | ||
} | ||
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lines := strings.Split(string(content), "\n") | ||
for _, line := range lines { | ||
arr := strings.Split(line, " ") | ||
if len(arr) == 2 && arr[0] == key { | ||
return strconv.Atoi(arr[1]) | ||
} | ||
} | ||
return 0, nil | ||
} | ||
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func registerMemoryEventV2(cgDir, evName, cgEvName string) (<-chan struct{}, error) { | ||
eventControlPath := filepath.Join(cgDir, evName) | ||
cgEvPath := filepath.Join(cgDir, cgEvName) | ||
fd, err := unix.InotifyInit() | ||
if err != nil { | ||
return nil, errors.Wrap(err, "unable to init inotify") | ||
} | ||
// watching oom kill | ||
evFd, err := unix.InotifyAddWatch(fd, eventControlPath, unix.IN_MODIFY) | ||
if err != nil { | ||
unix.Close(fd) | ||
return nil, errors.Wrap(err, "unable to add inotify watch") | ||
} | ||
// Because no `unix.IN_DELETE|unix.IN_DELETE_SELF` event for cgroup file system, so watching all process exited | ||
cgFd, err := unix.InotifyAddWatch(fd, cgEvPath, unix.IN_MODIFY) | ||
if err != nil { | ||
unix.Close(fd) | ||
return nil, errors.Wrap(err, "unable to add inotify watch") | ||
} | ||
ch := make(chan struct{}) | ||
go func() { | ||
var ( | ||
buffer [unix.SizeofInotifyEvent + unix.PathMax + 1]byte | ||
offset uint32 | ||
) | ||
defer func() { | ||
unix.Close(fd) | ||
close(ch) | ||
}() | ||
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for { | ||
n, err := unix.Read(fd, buffer[:]) | ||
if err != nil { | ||
logrus.Warnf("unable to read event data from inotify, got error: %v", err) | ||
return | ||
} | ||
if n < unix.SizeofInotifyEvent { | ||
logrus.Warnf("we should read at least %d bytes from inotify, but got %d bytes.", unix.SizeofInotifyEvent, n) | ||
return | ||
} | ||
offset = 0 | ||
for offset <= uint32(n-unix.SizeofInotifyEvent) { | ||
rawEvent := (*unix.InotifyEvent)(unsafe.Pointer(&buffer[offset])) | ||
offset += unix.SizeofInotifyEvent + uint32(rawEvent.Len) | ||
if rawEvent.Mask&unix.IN_MODIFY != unix.IN_MODIFY { | ||
continue | ||
} | ||
switch int(rawEvent.Wd) { | ||
case evFd: | ||
oom, err := getValueFromCgroup(eventControlPath, "oom_kill") | ||
if err != nil || oom > 0 { | ||
ch <- struct{}{} | ||
} | ||
case cgFd: | ||
pids, err := getValueFromCgroup(cgEvPath, "populated") | ||
if err != nil || pids == 0 { | ||
return | ||
} | ||
} | ||
} | ||
} | ||
}() | ||
return ch, nil | ||
} | ||
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// notifyOnOOMV2 returns channel on which you can expect event about OOM, | ||
// if process died without OOM this channel will be closed. | ||
func notifyOnOOMV2(path string) (<-chan struct{}, error) { | ||
return registerMemoryEventV2(path, "memory.events", "cgroup.events") | ||
} |
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