From: Rémy Oudompheng <oudomphe@phare.normalesup.org>
Date: Sat, 24 Aug 2013 01:34:07 +0000 (+0200)
Subject: syscall: add Cloneflags to Linux SysProcAttr.
X-Git-Tag: go1.2rc2~435
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=534c67abc425bc18ee95163c2266c1416b6f12c1;p=gostls13.git

syscall: add Cloneflags to Linux SysProcAttr.

Also use clone(2) syscall instead of fork().

Fixes #6214.

R=golang-dev, bradfitz, dave
CC=golang-dev
https://golang.org/cl/13159044
---

diff --git a/src/pkg/syscall/exec_linux.go b/src/pkg/syscall/exec_linux.go
index f332b7069c..81dc80800b 100644
--- a/src/pkg/syscall/exec_linux.go
+++ b/src/pkg/syscall/exec_linux.go
@@ -20,6 +20,7 @@ type SysProcAttr struct {
 	Noctty     bool        // Detach fd 0 from controlling terminal
 	Ctty       int         // Controlling TTY fd (Linux only)
 	Pdeathsig  Signal      // Signal that the process will get when its parent dies (Linux only)
+	Cloneflags uintptr     // Flags for clone calls (Linux only)
 }
 
 // Implemented in runtime package.
@@ -61,7 +62,7 @@ func forkAndExecInChild(argv0 *byte, argv, envv []*byte, chroot, dir *byte, attr
 	// About to call fork.
 	// No more allocation or calls of non-assembly functions.
 	runtime_BeforeFork()
-	r1, _, err1 = RawSyscall(SYS_FORK, 0, 0, 0)
+	r1, _, err1 = RawSyscall6(SYS_CLONE, uintptr(SIGCHLD)|sys.Cloneflags, 0, 0, 0, 0, 0)
 	if err1 != 0 {
 		runtime_AfterFork()
 		return 0, err1