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pid_util.go
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63 lines (60 loc) · 1.68 KB
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/*
* === This file is part of ALICE O² ===
*
* Copyright 2020 CERN and copyright holders of ALICE O².
* Author: Miltiadis Alexis <miltiadis.alexis@cern.ch>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* In applying this license CERN does not waive the privileges and
* immunities granted to it by virtue of its status as an
* Intergovernmental Organization or submit itself to any jurisdiction.
*/
package executable
import (
"os"
"syscall"
)
// pidExists will check if a pid process is running
func pidExists(pid int) bool {
if pid == 0 {
return false
} else if pid < 0 {
// A negative PID should still be acceptable, means it's a PGID
// so we make it positive to make it work with os.FindProcess
pid *= -1
}
proc, err := os.FindProcess(pid)
if err != nil {
return false
}
err = proc.Signal(syscall.Signal(0))
if err == nil {
return true
}
if err.Error() == "os: process already finished" {
return false
}
errno, ok := err.(syscall.Errno)
if !ok {
return false
}
switch errno {
case syscall.ESRCH:
return false
case syscall.EPERM:
return true
}
return false
}