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Add utility functions to set process as subreaper.

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This code is borrowed from libcontainer system package.

Signed-off-by: Mrunal Patel <mrunalp@gmail.com>
This commit is contained in:
Mrunal Patel 2016-08-01 16:48:12 -07:00
parent c13dbaf6ab
commit 7c5fccd7a8
1 changed files with 17 additions and 0 deletions
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17
utils/utils.go
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@ -3,8 +3,11 @@ package utils
import ( import (
"bytes" "bytes"
"os/exec" "os/exec"
"syscall"
) )
const PR_SET_CHILD_SUBREAPER = 36
func ExecCmd(name string, args ...string) (string, error) { func ExecCmd(name string, args ...string) (string, error) {
cmd := exec.Command(name, args...) cmd := exec.Command(name, args...)
var out bytes.Buffer var out bytes.Buffer
@ -17,3 +20,17 @@ func ExecCmd(name string, args ...string) (string, error) {
return out.String(), nil return out.String(), nil
} }
// SetSubreaper sets the value i as the subreaper setting for the calling process
func SetSubreaper(i int) error {
return Prctl(PR_SET_CHILD_SUBREAPER, uintptr(i), 0, 0, 0)
}
// Prctl is a way to make the prctl linux syscall
func Prctl(option int, arg2, arg3, arg4, arg5 uintptr) (err error) {
_, _, e1 := syscall.Syscall6(syscall.SYS_PRCTL, uintptr(option), arg2, arg3, arg4, arg5, 0)
if e1 != 0 {
err = e1
}
return
}