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ea5c94cdb9
It is not directly related to signal-handling, so can well live in its own package. Also added a variant that doesn't take a directory to write files to, for easier consumption / better match to how it's used. Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
45 lines
1.4 KiB
Go
45 lines
1.4 KiB
Go
package daemon // import "github.com/docker/docker/daemon"
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import (
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"fmt"
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"os"
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"unsafe"
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"github.com/docker/docker/pkg/stack"
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"github.com/sirupsen/logrus"
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"golang.org/x/sys/windows"
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)
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func (daemon *Daemon) setupDumpStackTrap(root string) {
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// Windows does not support signals like *nix systems. So instead of
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// trapping on SIGUSR1 to dump stacks, we wait on a Win32 event to be
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// signaled. ACL'd to builtin administrators and local system
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event := "Global\\stackdump-" + fmt.Sprint(os.Getpid())
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ev, _ := windows.UTF16PtrFromString(event)
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sd, err := windows.SecurityDescriptorFromString("D:P(A;;GA;;;BA)(A;;GA;;;SY)")
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if err != nil {
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logrus.Errorf("failed to get security descriptor for debug stackdump event %s: %s", event, err.Error())
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return
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}
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var sa windows.SecurityAttributes
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sa.Length = uint32(unsafe.Sizeof(sa))
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sa.InheritHandle = 1
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sa.SecurityDescriptor = sd
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h, err := windows.CreateEvent(&sa, 0, 0, ev)
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if h == 0 || err != nil {
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logrus.Errorf("failed to create debug stackdump event %s: %s", event, err.Error())
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return
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}
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go func() {
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logrus.Debugf("Stackdump - waiting signal at %s", event)
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for {
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windows.WaitForSingleObject(h, windows.INFINITE)
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path, err := stack.DumpToFile(root)
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if err != nil {
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logrus.WithError(err).Error("failed to write goroutines dump")
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} else {
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logrus.Infof("goroutine stacks written to %s", path)
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}
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}
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}()
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}
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