os/exec: unable to change terminal control capabilities with Setctty/Setsid

[gopherbot]

by charmes.guillaume:

Impossible to change terminal control capabilities.

Depending on the capability you try to set, you get: operation not supported by device,
operation denied, bad file descriptor.

I tried also directly using syscall.Rawsyscall of IOCTL, but get same result.

With os.exec: http://play.golang.org/p/8BEJrHXlIM
Directly with syscall: http://play.golang.org/p/d864INMbEe

Tried on versions:
go version go1.0.2 (ubuntu)
go version devel +70a50cc39caf Fri Feb 15 13:13:19 2013 -0500 linux/amd64
go version go1.0.3 (osx)
go version devel +786e094255c9 Tue Mar 19 07:08:26 2013 +0100 darwin/amd64

[remyoudompheng]

Comment 1:

You have to set the Stdout/Stderr properties when using exec.Command.

[gopherbot]

Comment 2 by charmes.guillaume:

I tried with os.Std* but still have the same thing.
http://play.golang.org/p/LK0Xyx857L

[gopherbot]

Comment 3 by jeff.allen:

From the tty_ioctl manpage on Linux:
TIOCSCTTY int arg
              Make  the given terminal the controlling terminal of the calling
              process.  The calling process must be a session leader  and  not
              have  a  controlling  terminal  already.   If  this  terminal is
              already the controlling terminal of a  different  session  group
              then the ioctl fails with EPERM, unless the caller is root (more
              precisely: has the CAP_SYS_ADMIN capability) and arg  equals  1,
              in which case the terminal is stolen, and all processes that had
              it as controlling terminal lose it.
It seems to me EPERM may be correct here. What are you trying to do? What does it look
like in C when it's working right?

[davecheney]

Comment 4:

Status changed to WaitingForReply.

[rsc]

Comment 5:

Labels changed: added priority-later, go1.2maybe, removed priority-triage.

[rsc]

Comment 6:

Labels changed: added feature.

[gopherbot]

Comment 7 by charmes.guillaume:

I haven't been able to make it work directly, but it works fine with
https://github.com/kr/pty. I guess we can close this issue.

[rsc]

Comment 8:

Status changed to Retracted.