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    • Benoit Sigoure's avatar
      x/sys/unix: Add support for the setns system call. · 54535356
      Benoit Sigoure authored 
      This system call is used to reassociate the current thread with a Linux
namespace (e.g. a network namespace or a mount namespace).  This system
call is key to interacting with the primitives enabling Linux containers.
The users of this system call will most likely want to wrap their calls
with a pair of LockOSThread / UnlockOSThread calls.  Here is an example
that is a reasonably close approximation of the `ns_exec' program given
as an example in `man 2 setns':

	package main

	import (
		"log"
		"os"
		"os/exec"
		"runtime"

		"golang.org/x/sys/unix"
	)

	func main() {
		if len(os.Args) < 3 {
			log.Fatalf("%s /proc/PID/ns/FILE cmd args...", os.Args[0])
		}
		fd, err := unix.Open(os.Args[1], unix.O_RDONLY, 0)
		if err != nil {
			log.Fatalf("open: %s", err)
		}
		runtime.LockOSThread()
		defer runtime.UnlockOSThread()
		if err = unix.Setns(fd, 0); err != nil {
			log.Fatalf("setns: %s", err)
		}
		cmd := exec.Command(os.Args[2], os.Args[3:]...)
		cmd.Stdin = os.Stdin
		cmd.Stdout = os.Stdout
		cmd.Stderr = os.Stderr
		err = cmd.Run()
		if err != nil {
			log.Fatalf("exec: %s", err)
		}
	}

Fixes golang/go#5968.

Change-Id: I78dc54667cfaef4f9e99a08d48f6e423686f1b22
Reviewed-on: https://go-review.googlesource.com/20054Reviewed-by: 's avatarBrad Fitzpatrick <bradfitz@golang.org>
      54535356
  23. 28 Feb, 2016 2 commits
  25. 22 Feb, 2016 1 commit
  27. 04 Feb, 2016 1 commit
  29. 27 Jan, 2016 1 commit
  31. 21 Jan, 2016 1 commit
  33. 13 Jan, 2016 1 commit
  35. 11 Dec, 2015 1 commit
  37. 24 Nov, 2015 1 commit
    • Nick Patavalis's avatar
      unix: Fix Termios type definition · 2bacc619
      Nick Patavalis authored 
      - types_linux.go: Use the kernel-defined termios structure, *not* the
  LIBC-defined one. The LIBC termios structure cannot be safely used
  to do tty-related ioctls on all architectures (e.g. ppc64,
  ppc64le). The kernel termios structure, and the associated
  macros/constants, are defined in: "asm/termbits.h" which is included
  by "linux/termios.h". The LIBC termios structure is defined in
  "bits/termios.h" which is included by "termios.h". These structures
  are *not* the same.

  For systems that have both "struct termios" and "struct termios2"
  use the latter to define the Termios type. This is ok, since the
  "struct termios2" memory layout is compatible with "struct termios"
  (with a couple of fields added at the end). This way, type Termios
  can be used with both: the "old-style" TCSETS[FW], TCGETS ioctls,
  *and* with the new TCSETS[FW]2, TCGETS2 ioctls. The new ioctls allow
  configuring arbitrary baudrates.

  The new Termios definitions (kernel-compatible) have the same fields
  as the old ones (LIBC-derived) so there should be no user-code
  compatibility issues.

Change-Id: I3c1484c60f45b28e13404765c01616c33063afd5
Reviewed-on: https://go-review.googlesource.com/17185Reviewed-by: 's avatarIan Lance Taylor <iant@golang.org>
Reviewed-by: 's avatarBrad Fitzpatrick <bradfitz@golang.org>
      2bacc619
  39. 23 Nov, 2015 1 commit
  41. 29 Oct, 2015 1 commit
  43. 09 Oct, 2015 1 commit
  45. 08 Oct, 2015 1 commit
  47. 25 Sep, 2015 2 commits
  49. 24 Sep, 2015 1 commit
  51. 17 Sep, 2015 1 commit
    • Shawn Walker-Salas's avatar
      unix: add various missing syscalls available on Linux · 68a71b6b
      Shawn Walker-Salas authored 
      Various syscalls offered by x/sys/unix on Linux are not available on
Solaris and should be, such as Mkfifo, Getwd(), Futimes() and others.
In particular, all of the *at() variants of existing functions were
added where appropriate.

Getgroups() was fixed to use the correct value for its sanity check on
the maximum number of groups.

Utimesnano() was updated to use the native Solaris utimensat function
for setting nanosecond-precision time.

Utimes() was updated to have the same error semantics and checking as
other platforms.

Getgroups(), anysocktoaddr(), and Recvmsg() were fixed to check the
return value before assuming syscall failure instead of relying solely
on errno being set.

mksyscall_solaris.pl needed some updates to better match the output of
the one found in syscall.

mkerrors.sh needed some updates to work out of the box on Solaris,
matching those recently done to the one in syscall.

The signatures (names) of some function parameters were changed to be
consistent with other platforms for the sake of documentation.

Fixes #8609

Change-Id: I9e4e2fee6d3ecfad9f4d845a5702ffde5166e804
Reviewed-on: https://go-review.googlesource.com/14643Reviewed-by: 's avatarAram Hăvărneanu <aram@mgk.ro>
      68a71b6b
  53. 10 Sep, 2015 1 commit
  55. 09 Sep, 2015 1 commit
  57. 02 Sep, 2015 2 commits
  59. 01 Sep, 2015 2 commits
  61. 31 Aug, 2015 2 commits