46 lines
1.1 KiB
Go
46 lines
1.1 KiB
Go
package runc
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import (
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"fmt"
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"io/ioutil"
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"os/exec"
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"strconv"
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"syscall"
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)
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// ReadPidFile reads the pid file at the provided path and returns
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// the pid or an error if the read and conversion is unsuccessful
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func ReadPidFile(path string) (int, error) {
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data, err := ioutil.ReadFile(path)
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if err != nil {
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return -1, err
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}
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return strconv.Atoi(string(data))
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}
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// runOrError will run the provided command. If an error is
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// encountered and neither Stdout or Stderr was set the error and the
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// stderr of the command will be returned in the format of <error>:
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// <stderr>
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func runOrError(cmd *exec.Cmd) error {
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if cmd.Stdout != nil || cmd.Stderr != nil {
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return cmd.Run()
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}
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data, err := cmd.CombinedOutput()
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if err != nil {
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return fmt.Errorf("%s: %s", err, data)
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}
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return nil
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}
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const exitSignalOffset = 128
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// exitStatus returns the correct exit status for a process based on if it
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// was signaled or exited cleanly
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func exitStatus(status syscall.WaitStatus) int {
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if status.Signaled() {
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return exitSignalOffset + int(status.Signal())
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}
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return status.ExitStatus()
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}
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