31 lines
1.2 KiB
Go
31 lines
1.2 KiB
Go
package pidfile // import "github.com/docker/docker/pkg/pidfile"
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import (
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"golang.org/x/sys/windows"
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)
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func processExists(pid int) bool {
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h, err := windows.OpenProcess(windows.PROCESS_QUERY_LIMITED_INFORMATION, false, uint32(pid))
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if err != nil {
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return false
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}
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var c uint32
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err = windows.GetExitCodeProcess(h, &c)
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_ = windows.CloseHandle(h)
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if err != nil {
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// From the GetExitCodeProcess function (processthreadsapi.h) API docs:
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// https://learn.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-getexitcodeprocess
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//
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// The GetExitCodeProcess function returns a valid error code defined by the
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// application only after the thread terminates. Therefore, an application should
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// not use STILL_ACTIVE (259) as an error code (STILL_ACTIVE is a macro for
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// STATUS_PENDING (minwinbase.h)). If a thread returns STILL_ACTIVE (259) as
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// an error code, then applications that test for that value could interpret it
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// to mean that the thread is still running, and continue to test for the
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// completion of the thread after the thread has terminated, which could put
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// the application into an infinite loop.
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return c == uint32(windows.STATUS_PENDING)
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}
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return true
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}
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