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| author | Nicolas Lacasse <nlacasse@google.com> | 2019-06-25 11:46:19 -0700 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2019-06-25 11:47:27 -0700 |
| commit | a8f148b8e4098eaeb80e1d704b64aab8aeb1294f (patch) | |
| tree | 84e3b913a2c2be598eb89d1a666bacb83abbca11 /runsc/cmd/exec.go | |
| parent | 03ae91c662869a37ba71dd2577d4e218a3aa4669 (diff) | |
Use different Ctty FDs based on the go version.
An upcoming change in Go 1.13 [1] changes the semantics of the SysProcAttr.Ctty
field. Prior to the change, the FD must be an FD in the child process's FD
table (aka "post-shuffle"). After the change, the FD must be an FD in the
current process's FD table (aka "pre-shuffle").
To be compatible with both versions this CL introduces a new boolean
"CttyFdIsPostShuffle" which indicates whether a pre- or post-shuffle FD should
be provided. We use build tags to chose the correct one.
1: https://go-review.googlesource.com/c/go/+/178919/
PiperOrigin-RevId: 255015303
Diffstat (limited to 'runsc/cmd/exec.go')
| -rw-r--r-- | runsc/cmd/exec.go | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/runsc/cmd/exec.go b/runsc/cmd/exec.go index 7adc23a77..5a823e89a 100644 --- a/runsc/cmd/exec.go +++ b/runsc/cmd/exec.go @@ -237,6 +237,16 @@ func (ex *Exec) execChildAndWait(waitStatus *syscall.WaitStatus) subcommands.Exi Setctty: true, Ctty: int(tty.Fd()), } + // TODO(b/133868570): Delete this check once Go 1.12 is no + // longer supported. + if console.CttyFdIsPostShuffle { + // In go1.12 and before, the Ctty FD must be the FD in + // the child process's FD table. Since we set + // cmd.Stdin/Stdout/Stderr to the tty FD, we can use + // any of 0, 1, or 2 here. + cmd.SysProcAttr.Ctty = 0 + } + } if err := cmd.Start(); err != nil { |