diff options
author | Yawning Angel <yawning@torproject.org> | 2015-03-28 02:49:07 +0000 |
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committer | Yawning Angel <yawning@torproject.org> | 2015-03-28 02:49:07 +0000 |
commit | 657c8e4f02ad6c6c3cc97256b7529fe5514c0945 (patch) | |
tree | 361eb814137b02f20ce78e2d863abb8b91cdfcbe /obfs4proxy/parentMonitor.go | |
parent | b670a079236a4e382cfe927f3e352b3e7a231166 (diff) |
Clean up/refactor the shutdown/termination handling code.
This combines the old signal processing code with the parent monitor,
into a new termination monitor structure, which also now handles keeping
track of outstanding sessions.
Diffstat (limited to 'obfs4proxy/parentMonitor.go')
-rw-r--r-- | obfs4proxy/parentMonitor.go | 88 |
1 files changed, 0 insertions, 88 deletions
diff --git a/obfs4proxy/parentMonitor.go b/obfs4proxy/parentMonitor.go deleted file mode 100644 index e2f078d..0000000 --- a/obfs4proxy/parentMonitor.go +++ /dev/null @@ -1,88 +0,0 @@ -/* - * Copyright (c) 2015, Yawning Angel <yawning at torproject dot org> - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are met: - * - * * Redistributions of source code must retain the above copyright notice, - * this list of conditions and the following disclaimer. - * - * * Redistributions in binary form must reproduce the above copyright notice, - * this list of conditions and the following disclaimer in the documentation - * and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" - * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE - * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR - * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF - * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN - * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) - * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - */ - -package main - -import ( - "fmt" - "os" - "runtime" - "syscall" - "time" -) - -var parentMonitorOSInit func() error - -func initParentMonitor() error { - // Until #15435 is implemented, there is no reliable way to see if - // the parent has died that is portable/platform independent/reliable. - // - // Do the next best thing and use various kludges and hacks: - // * Linux - Platform specific code that should always work. - // * Other U*IX - Somewhat generic code, that works unless the parent - // dies before the monitor is initialized. - // * Windows - Log an error, can't be bothered to figure out how - // to handle this there. - if parentMonitorOSInit != nil { - return parentMonitorOSInit() - } else if runtime.GOOS != "windows" { - ppid := os.Getppid() - go parentMonitorPpidChange(ppid) - return nil - } - return fmt.Errorf("unsupported on: %s", runtime.GOOS) -} - -func parentMonitorPpidChange(ppid int) { - // Under most if not all U*IX systems, the parent PID will change - // to that of init once the parent dies. There are several notable - // exceptions (Slowlaris/Android), but the parent PID changes - // under those platforms as well. - // - // Naturally we lose if the parent has died by the time when the - // Getppid() call was issued in our parent, but, this is better - // than nothing. - - const ppidPollInterval = 1 * time.Second - for ppid == os.Getppid() { - time.Sleep(ppidPollInterval) - } - - // If possible SIGTERM ourself so that the normal shutdown code - // gets invoked. If any of that fails, exit anyway, we are a - // defunt process. - noticef("Parent pid changed: %d (was %d)", os.Getppid(), ppid) - if p, err := os.FindProcess(os.Getpid()); err == nil { - if err := p.Signal(syscall.SIGTERM); err == nil { - return - } - warnf("Failed to SIGTERM ourself: %v", err) - } else { - warnf("Failed to find our own process: %v", err) - } - os.Exit(-1) -} |