syscall: Linux-only support for parent death signal

As discussed in this thread:

https://groups.google.com/group/golang-dev/browse_thread/thread/5b76b7700265a787

I've tried to come up with a solution that is minimally invasive for the platforms that don't support "parent death signal", without splitting up exec_unix.go.

See also: http://www.win.tue.nl/~aeb/linux/lk/lk-5.html#ss5.8

R=rsc, dave, borman, iant, mikioh.mikioh
CC=golang-dev
https://golang.org/cl/5487061

src/buildscript_darwin_386.sh

@@ -262,7 +262,7 @@ cp "$WORK"/encoding/json.a "$GOROOT"/pkg/darwin_386/encoding/json.a
 
 mkdir -p "$WORK"/syscall/_obj/
 cd "$GOROOT"/src/pkg/syscall
-8g -o "$WORK"/syscall/_obj/_go_.8 -p syscall -I "$WORK" ./bpf_bsd.go ./env_unix.go ./exec_unix.go ./route_bsd.go ./route_darwin.go ./sockcmsg_unix.go ./str.go ./syscall.go ./syscall_386.go ./syscall_bsd.go ./syscall_darwin.go ./syscall_darwin_386.go ./syscall_unix.go ./zerrors_darwin_386.go ./zsyscall_darwin_386.go ./zsysnum_darwin_386.go ./ztypes_darwin_386.go
+8g -o "$WORK"/syscall/_obj/_go_.8 -p syscall -I "$WORK" ./bpf_bsd.go ./env_unix.go ./exec_bsd.go ./exec_unix.go ./route_bsd.go ./route_darwin.go ./sockcmsg_unix.go ./str.go ./syscall.go ./syscall_386.go ./syscall_bsd.go ./syscall_darwin.go ./syscall_darwin_386.go ./syscall_unix.go ./zerrors_darwin_386.go ./zsyscall_darwin_386.go ./zsysnum_darwin_386.go ./ztypes_darwin_386.go
 8a -I "$WORK"/syscall/_obj/ -o "$WORK"/syscall/_obj/asm_darwin_386.8 -DGOOS_darwin -DGOARCH_386 ./asm_darwin_386.s
 gopack grc "$WORK"/syscall.a "$WORK"/syscall/_obj/_go_.8 "$WORK"/syscall/_obj/asm_darwin_386.8
 cp "$WORK"/syscall.a "$GOROOT"/pkg/darwin_386/syscall.a

src/buildscript_darwin_amd64.sh

@@ -261,7 +261,7 @@ cp "$WORK"/encoding/json.a "$GOROOT"/pkg/darwin_amd64/encoding/json.a
 
 mkdir -p "$WORK"/syscall/_obj/
 cd "$GOROOT"/src/pkg/syscall
-6g -o "$WORK"/syscall/_obj/_go_.6 -p syscall -I "$WORK" ./bpf_bsd.go ./env_unix.go ./exec_unix.go ./route_bsd.go ./route_darwin.go ./sockcmsg_unix.go ./str.go ./syscall.go ./syscall_amd64.go ./syscall_bsd.go ./syscall_darwin.go ./syscall_darwin_amd64.go ./syscall_unix.go ./zerrors_darwin_amd64.go ./zsyscall_darwin_amd64.go ./zsysnum_darwin_amd64.go ./ztypes_darwin_amd64.go
+6g -o "$WORK"/syscall/_obj/_go_.6 -p syscall -I "$WORK" ./bpf_bsd.go ./env_unix.go ./exec_bsd.go ./exec_unix.go ./route_bsd.go ./route_darwin.go ./sockcmsg_unix.go ./str.go ./syscall.go ./syscall_amd64.go ./syscall_bsd.go ./syscall_darwin.go ./syscall_darwin_amd64.go ./syscall_unix.go ./zerrors_darwin_amd64.go ./zsyscall_darwin_amd64.go ./zsysnum_darwin_amd64.go ./ztypes_darwin_amd64.go
 6a -I "$WORK"/syscall/_obj/ -o "$WORK"/syscall/_obj/asm_darwin_amd64.6 -DGOOS_darwin -DGOARCH_amd64 ./asm_darwin_amd64.s
 gopack grc "$WORK"/syscall.a "$WORK"/syscall/_obj/_go_.6 "$WORK"/syscall/_obj/asm_darwin_amd64.6
 cp "$WORK"/syscall.a "$GOROOT"/pkg/darwin_amd64/syscall.a

src/buildscript_freebsd_386.sh

@@ -262,7 +262,7 @@ cp "$WORK"/encoding/json.a "$GOROOT"/pkg/freebsd_386/encoding/json.a
 
 mkdir -p "$WORK"/syscall/_obj/
 cd "$GOROOT"/src/pkg/syscall
-8g -o "$WORK"/syscall/_obj/_go_.8 -p syscall -I "$WORK" ./bpf_bsd.go ./env_unix.go ./exec_unix.go ./route_bsd.go ./route_freebsd.go ./sockcmsg_unix.go ./str.go ./syscall.go ./syscall_386.go ./syscall_bsd.go ./syscall_freebsd.go ./syscall_freebsd_386.go ./syscall_unix.go ./zerrors_freebsd_386.go ./zsyscall_freebsd_386.go ./zsysnum_freebsd_386.go ./ztypes_freebsd_386.go
+8g -o "$WORK"/syscall/_obj/_go_.8 -p syscall -I "$WORK" ./bpf_bsd.go ./env_unix.go ./exec_bsd.go ./exec_unix.go ./route_bsd.go ./route_freebsd.go ./sockcmsg_unix.go ./str.go ./syscall.go ./syscall_386.go ./syscall_bsd.go ./syscall_freebsd.go ./syscall_freebsd_386.go ./syscall_unix.go ./zerrors_freebsd_386.go ./zsyscall_freebsd_386.go ./zsysnum_freebsd_386.go ./ztypes_freebsd_386.go
 8a -I "$WORK"/syscall/_obj/ -o "$WORK"/syscall/_obj/asm_freebsd_386.8 -DGOOS_freebsd -DGOARCH_386 ./asm_freebsd_386.s
 gopack grc "$WORK"/syscall.a "$WORK"/syscall/_obj/_go_.8 "$WORK"/syscall/_obj/asm_freebsd_386.8
 cp "$WORK"/syscall.a "$GOROOT"/pkg/freebsd_386/syscall.a

src/buildscript_freebsd_amd64.sh

@@ -261,7 +261,7 @@ cp "$WORK"/encoding/json.a "$GOROOT"/pkg/freebsd_amd64/encoding/json.a
 
 mkdir -p "$WORK"/syscall/_obj/
 cd "$GOROOT"/src/pkg/syscall
-6g -o "$WORK"/syscall/_obj/_go_.6 -p syscall -I "$WORK" ./bpf_bsd.go ./env_unix.go ./exec_unix.go ./route_bsd.go ./route_freebsd.go ./sockcmsg_unix.go ./str.go ./syscall.go ./syscall_amd64.go ./syscall_bsd.go ./syscall_freebsd.go ./syscall_freebsd_amd64.go ./syscall_unix.go ./zerrors_freebsd_amd64.go ./zsyscall_freebsd_amd64.go ./zsysnum_freebsd_amd64.go ./ztypes_freebsd_amd64.go
+6g -o "$WORK"/syscall/_obj/_go_.6 -p syscall -I "$WORK" ./bpf_bsd.go ./env_unix.go ./exec_bsd.go ./exec_unix.go ./route_bsd.go ./route_freebsd.go ./sockcmsg_unix.go ./str.go ./syscall.go ./syscall_amd64.go ./syscall_bsd.go ./syscall_freebsd.go ./syscall_freebsd_amd64.go ./syscall_unix.go ./zerrors_freebsd_amd64.go ./zsyscall_freebsd_amd64.go ./zsysnum_freebsd_amd64.go ./ztypes_freebsd_amd64.go
 6a -I "$WORK"/syscall/_obj/ -o "$WORK"/syscall/_obj/asm_freebsd_amd64.6 -DGOOS_freebsd -DGOARCH_amd64 ./asm_freebsd_amd64.s
 gopack grc "$WORK"/syscall.a "$WORK"/syscall/_obj/_go_.6 "$WORK"/syscall/_obj/asm_freebsd_amd64.6
 cp "$WORK"/syscall.a "$GOROOT"/pkg/freebsd_amd64/syscall.a

src/buildscript_linux_386.sh

@@ -262,7 +262,7 @@ cp "$WORK"/encoding/json.a "$GOROOT"/pkg/linux_386/encoding/json.a
 
 mkdir -p "$WORK"/syscall/_obj/
 cd "$GOROOT"/src/pkg/syscall
-8g -o "$WORK"/syscall/_obj/_go_.8 -p syscall -I "$WORK" ./env_unix.go ./exec_unix.go ./lsf_linux.go ./netlink_linux.go ./sockcmsg_linux.go ./sockcmsg_unix.go ./str.go ./syscall.go ./syscall_386.go ./syscall_linux.go ./syscall_linux_386.go ./syscall_unix.go ./zerrors_linux_386.go ./zsyscall_linux_386.go ./zsysnum_linux_386.go ./ztypes_linux_386.go
+8g -o "$WORK"/syscall/_obj/_go_.8 -p syscall -I "$WORK" ./env_unix.go ./exec_linux.go ./exec_unix.go ./lsf_linux.go ./netlink_linux.go ./sockcmsg_linux.go ./sockcmsg_unix.go ./str.go ./syscall.go ./syscall_386.go ./syscall_linux.go ./syscall_linux_386.go ./syscall_unix.go ./zerrors_linux_386.go ./zsyscall_linux_386.go ./zsysnum_linux_386.go ./ztypes_linux_386.go
 8a -I "$WORK"/syscall/_obj/ -o "$WORK"/syscall/_obj/asm_linux_386.8 -DGOOS_linux -DGOARCH_386 ./asm_linux_386.s
 gopack grc "$WORK"/syscall.a "$WORK"/syscall/_obj/_go_.8 "$WORK"/syscall/_obj/asm_linux_386.8
 cp "$WORK"/syscall.a "$GOROOT"/pkg/linux_386/syscall.a

src/buildscript_linux_amd64.sh

@@ -261,7 +261,7 @@ cp "$WORK"/encoding/json.a "$GOROOT"/pkg/linux_amd64/encoding/json.a
 
 mkdir -p "$WORK"/syscall/_obj/
 cd "$GOROOT"/src/pkg/syscall
-6g -o "$WORK"/syscall/_obj/_go_.6 -p syscall -I "$WORK" ./env_unix.go ./exec_unix.go ./lsf_linux.go ./netlink_linux.go ./sockcmsg_linux.go ./sockcmsg_unix.go ./str.go ./syscall.go ./syscall_amd64.go ./syscall_linux.go ./syscall_linux_amd64.go ./syscall_unix.go ./zerrors_linux_amd64.go ./zsyscall_linux_amd64.go ./zsysnum_linux_amd64.go ./ztypes_linux_amd64.go
+6g -o "$WORK"/syscall/_obj/_go_.6 -p syscall -I "$WORK" ./env_unix.go ./exec_linux.go ./exec_unix.go ./lsf_linux.go ./netlink_linux.go ./sockcmsg_linux.go ./sockcmsg_unix.go ./str.go ./syscall.go ./syscall_amd64.go ./syscall_linux.go ./syscall_linux_amd64.go ./syscall_unix.go ./zerrors_linux_amd64.go ./zsyscall_linux_amd64.go ./zsysnum_linux_amd64.go ./ztypes_linux_amd64.go
 6a -I "$WORK"/syscall/_obj/ -o "$WORK"/syscall/_obj/asm_linux_amd64.6 -DGOOS_linux -DGOARCH_amd64 ./asm_linux_amd64.s
 gopack grc "$WORK"/syscall.a "$WORK"/syscall/_obj/_go_.6 "$WORK"/syscall/_obj/asm_linux_amd64.6
 cp "$WORK"/syscall.a "$GOROOT"/pkg/linux_amd64/syscall.a

src/buildscript_linux_arm.sh

@@ -265,7 +265,7 @@ cp "$WORK"/encoding/json.a "$GOROOT"/pkg/linux_arm/encoding/json.a
 
 mkdir -p "$WORK"/syscall/_obj/
 cd "$GOROOT"/src/pkg/syscall
-5g -o "$WORK"/syscall/_obj/_go_.5 -p syscall -I "$WORK" ./env_unix.go ./exec_unix.go ./lsf_linux.go ./netlink_linux.go ./sockcmsg_linux.go ./sockcmsg_unix.go ./str.go ./syscall.go ./syscall_arm.go ./syscall_linux.go ./syscall_linux_arm.go ./syscall_unix.go ./zerrors_linux_arm.go ./zsyscall_linux_arm.go ./zsysnum_linux_arm.go ./ztypes_linux_arm.go
+5g -o "$WORK"/syscall/_obj/_go_.5 -p syscall -I "$WORK" ./env_unix.go ./exec_linux.go ./exec_unix.go ./lsf_linux.go ./netlink_linux.go ./sockcmsg_linux.go ./sockcmsg_unix.go ./str.go ./syscall.go ./syscall_arm.go ./syscall_linux.go ./syscall_linux_arm.go ./syscall_unix.go ./zerrors_linux_arm.go ./zsyscall_linux_arm.go ./zsysnum_linux_arm.go ./ztypes_linux_arm.go
 5a -I "$WORK"/syscall/_obj/ -o "$WORK"/syscall/_obj/asm_linux_arm.5 -DGOOS_linux -DGOARCH_arm ./asm_linux_arm.s
 gopack grc "$WORK"/syscall.a "$WORK"/syscall/_obj/_go_.5 "$WORK"/syscall/_obj/asm_linux_arm.5
 cp "$WORK"/syscall.a "$GOROOT"/pkg/linux_arm/syscall.a

src/buildscript_netbsd_386.sh

@@ -262,7 +262,7 @@ cp "$WORK"/encoding/json.a "$GOROOT"/pkg/netbsd_386/encoding/json.a
 
 mkdir -p "$WORK"/syscall/_obj/
 cd "$GOROOT"/src/pkg/syscall
-8g -o "$WORK"/syscall/_obj/_go_.8 -p syscall -I "$WORK" ./bpf_bsd.go ./env_unix.go ./exec_unix.go ./route_bsd.go ./route_netbsd.go ./sockcmsg_unix.go ./str.go ./syscall.go ./syscall_386.go ./syscall_bsd.go ./syscall_netbsd.go ./syscall_netbsd_386.go ./syscall_unix.go ./zerrors_netbsd_386.go ./zsyscall_netbsd_386.go ./zsysnum_netbsd_386.go ./ztypes_netbsd_386.go
+8g -o "$WORK"/syscall/_obj/_go_.8 -p syscall -I "$WORK" ./bpf_bsd.go ./env_unix.go ./exec_bsd.go ./exec_unix.go ./route_bsd.go ./route_netbsd.go ./sockcmsg_unix.go ./str.go ./syscall.go ./syscall_386.go ./syscall_bsd.go ./syscall_netbsd.go ./syscall_netbsd_386.go ./syscall_unix.go ./zerrors_netbsd_386.go ./zsyscall_netbsd_386.go ./zsysnum_netbsd_386.go ./ztypes_netbsd_386.go
 8a -I "$WORK"/syscall/_obj/ -o "$WORK"/syscall/_obj/asm_netbsd_386.8 -DGOOS_netbsd -DGOARCH_386 ./asm_netbsd_386.s
 gopack grc "$WORK"/syscall.a "$WORK"/syscall/_obj/_go_.8 "$WORK"/syscall/_obj/asm_netbsd_386.8
 cp "$WORK"/syscall.a "$GOROOT"/pkg/netbsd_386/syscall.a

src/buildscript_netbsd_amd64.sh

@@ -261,7 +261,7 @@ cp "$WORK"/encoding/json.a "$GOROOT"/pkg/netbsd_amd64/encoding/json.a
 
 mkdir -p "$WORK"/syscall/_obj/
 cd "$GOROOT"/src/pkg/syscall
-6g -o "$WORK"/syscall/_obj/_go_.6 -p syscall -I "$WORK" ./bpf_bsd.go ./env_unix.go ./exec_unix.go ./route_bsd.go ./route_netbsd.go ./sockcmsg_unix.go ./str.go ./syscall.go ./syscall_amd64.go ./syscall_bsd.go ./syscall_netbsd.go ./syscall_netbsd_amd64.go ./syscall_unix.go ./zerrors_netbsd_amd64.go ./zsyscall_netbsd_amd64.go ./zsysnum_netbsd_amd64.go ./ztypes_netbsd_amd64.go
+6g -o "$WORK"/syscall/_obj/_go_.6 -p syscall -I "$WORK" ./bpf_bsd.go ./env_unix.go ./exec_bsd.go ./exec_unix.go ./route_bsd.go ./route_netbsd.go ./sockcmsg_unix.go ./str.go ./syscall.go ./syscall_amd64.go ./syscall_bsd.go ./syscall_netbsd.go ./syscall_netbsd_amd64.go ./syscall_unix.go ./zerrors_netbsd_amd64.go ./zsyscall_netbsd_amd64.go ./zsysnum_netbsd_amd64.go ./ztypes_netbsd_amd64.go
 6a -I "$WORK"/syscall/_obj/ -o "$WORK"/syscall/_obj/asm_netbsd_amd64.6 -DGOOS_netbsd -DGOARCH_amd64 ./asm_netbsd_amd64.s
 gopack grc "$WORK"/syscall.a "$WORK"/syscall/_obj/_go_.6 "$WORK"/syscall/_obj/asm_netbsd_amd64.6
 cp "$WORK"/syscall.a "$GOROOT"/pkg/netbsd_amd64/syscall.a

src/buildscript_openbsd_386.sh

@@ -262,7 +262,7 @@ cp "$WORK"/encoding/json.a "$GOROOT"/pkg/openbsd_386/encoding/json.a
 
 mkdir -p "$WORK"/syscall/_obj/
 cd "$GOROOT"/src/pkg/syscall
-8g -o "$WORK"/syscall/_obj/_go_.8 -p syscall -I "$WORK" ./bpf_bsd.go ./env_unix.go ./exec_unix.go ./route_bsd.go ./route_openbsd.go ./sockcmsg_unix.go ./str.go ./syscall.go ./syscall_386.go ./syscall_bsd.go ./syscall_openbsd.go ./syscall_openbsd_386.go ./syscall_unix.go ./zerrors_openbsd_386.go ./zsyscall_openbsd_386.go ./zsysctl_openbsd.go ./zsysnum_openbsd_386.go ./ztypes_openbsd_386.go
+8g -o "$WORK"/syscall/_obj/_go_.8 -p syscall -I "$WORK" ./bpf_bsd.go ./env_unix.go ./exec_bsd.go ./exec_unix.go ./route_bsd.go ./route_openbsd.go ./sockcmsg_unix.go ./str.go ./syscall.go ./syscall_386.go ./syscall_bsd.go ./syscall_openbsd.go ./syscall_openbsd_386.go ./syscall_unix.go ./zerrors_openbsd_386.go ./zsyscall_openbsd_386.go ./zsysctl_openbsd.go ./zsysnum_openbsd_386.go ./ztypes_openbsd_386.go
 8a -I "$WORK"/syscall/_obj/ -o "$WORK"/syscall/_obj/asm_openbsd_386.8 -DGOOS_openbsd -DGOARCH_386 ./asm_openbsd_386.s
 gopack grc "$WORK"/syscall.a "$WORK"/syscall/_obj/_go_.8 "$WORK"/syscall/_obj/asm_openbsd_386.8
 cp "$WORK"/syscall.a "$GOROOT"/pkg/openbsd_386/syscall.a

src/buildscript_openbsd_amd64.sh

@@ -261,7 +261,7 @@ cp "$WORK"/encoding/json.a "$GOROOT"/pkg/openbsd_amd64/encoding/json.a
 
 mkdir -p "$WORK"/syscall/_obj/
 cd "$GOROOT"/src/pkg/syscall
-6g -o "$WORK"/syscall/_obj/_go_.6 -p syscall -I "$WORK" ./bpf_bsd.go ./env_unix.go ./exec_unix.go ./route_bsd.go ./route_openbsd.go ./sockcmsg_unix.go ./str.go ./syscall.go ./syscall_amd64.go ./syscall_bsd.go ./syscall_openbsd.go ./syscall_openbsd_amd64.go ./syscall_unix.go ./zerrors_openbsd_amd64.go ./zsyscall_openbsd_amd64.go ./zsysctl_openbsd.go ./zsysnum_openbsd_amd64.go ./ztypes_openbsd_amd64.go
+6g -o "$WORK"/syscall/_obj/_go_.6 -p syscall -I "$WORK" ./bpf_bsd.go ./env_unix.go ./exec_bsd.go ./exec_unix.go ./route_bsd.go ./route_openbsd.go ./sockcmsg_unix.go ./str.go ./syscall.go ./syscall_amd64.go ./syscall_bsd.go ./syscall_openbsd.go ./syscall_openbsd_amd64.go ./syscall_unix.go ./zerrors_openbsd_amd64.go ./zsyscall_openbsd_amd64.go ./zsysctl_openbsd.go ./zsysnum_openbsd_amd64.go ./ztypes_openbsd_amd64.go
 6a -I "$WORK"/syscall/_obj/ -o "$WORK"/syscall/_obj/asm_openbsd_amd64.6 -DGOOS_openbsd -DGOARCH_amd64 ./asm_openbsd_amd64.s
 gopack grc "$WORK"/syscall.a "$WORK"/syscall/_obj/_go_.6 "$WORK"/syscall/_obj/asm_openbsd_amd64.6
 cp "$WORK"/syscall.a "$GOROOT"/pkg/openbsd_amd64/syscall.a

src/pkg/syscall/Makefile

@@ -19,6 +19,7 @@ GOFILES=\
 GOFILES_darwin=\
 	bpf_bsd.go\
 	env_unix.go\
+	exec_bsd.go\
 	exec_unix.go\
 	route_bsd.go\
 	route_darwin.go\
@@ -29,6 +30,7 @@ GOFILES_darwin=\
 GOFILES_freebsd=\
 	bpf_bsd.go\
 	env_unix.go\
+	exec_bsd.go\
 	exec_unix.go\
 	route_bsd.go\
 	route_freebsd.go\
@@ -39,6 +41,7 @@ GOFILES_freebsd=\
 GOFILES_linux=\
 	env_unix.go\
 	exec_unix.go\
+	exec_linux.go\
 	lsf_linux.go\
 	netlink_linux.go\
 	sockcmsg_linux.go\
@@ -48,6 +51,7 @@ GOFILES_linux=\
 GOFILES_netbsd=\
 	bpf_bsd.go\
 	env_unix.go\
+	exec_bsd.go\
 	exec_unix.go\
 	route_bsd.go\
 	route_netbsd.go\
@@ -58,6 +62,7 @@ GOFILES_netbsd=\
 GOFILES_openbsd=\
 	bpf_bsd.go\
 	env_unix.go\
+	exec_bsd.go\
 	exec_unix.go\
 	route_bsd.go\
 	route_openbsd.go\

src/pkg/syscall/exec_bsd.go

@@ -0,0 +1,220 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin freebsd netbsd openbsd
+
+package syscall
+
+import (
+	"unsafe"
+)
+
+type SysProcAttr struct {
+	Chroot     string      // Chroot.
+	Credential *Credential // Credential.
+	Ptrace     bool        // Enable tracing.
+	Setsid     bool        // Create session.
+	Setpgid    bool        // Set process group ID to new pid (SYSV setpgrp)
+	Setctty    bool        // Set controlling terminal to fd 0
+	Noctty     bool        // Detach fd 0 from controlling terminal
+}
+
+// Fork, dup fd onto 0..len(fd), and exec(argv0, argvv, envv) in child.
+// If a dup or exec fails, write the errno error to pipe.
+// (Pipe is close-on-exec so if exec succeeds, it will be closed.)
+// In the child, this function must not acquire any locks, because
+// they might have been locked at the time of the fork.  This means
+// no rescheduling, no malloc calls, and no new stack segments.
+// The calls to RawSyscall are okay because they are assembly
+// functions that do not grow the stack.
+func forkAndExecInChild(argv0 *byte, argv, envv []*byte, chroot, dir *byte, attr *ProcAttr, sys *SysProcAttr, pipe int) (pid int, err Errno) {
+	// Declare all variables at top in case any
+	// declarations require heap allocation (e.g., err1).
+	var (
+		r1, r2 uintptr
+		err1   Errno
+		nextfd int
+		i      int
+	)
+
+	// guard against side effects of shuffling fds below.
+	fd := append([]int(nil), attr.Files...)
+
+	darwin := OS == "darwin"
+
+	// About to call fork.
+	// No more allocation or calls of non-assembly functions.
+	r1, r2, err1 = RawSyscall(SYS_FORK, 0, 0, 0)
+	if err1 != 0 {
+		return 0, err1
+	}
+
+	// On Darwin:
+	//	r1 = child pid in both parent and child.
+	//	r2 = 0 in parent, 1 in child.
+	// Convert to normal Unix r1 = 0 in child.
+	if darwin && r2 == 1 {
+		r1 = 0
+	}
+
+	if r1 != 0 {
+		// parent; return PID
+		return int(r1), 0
+	}
+
+	// Fork succeeded, now in child.
+
+	// Enable tracing if requested.
+	if sys.Ptrace {
+		_, _, err1 = RawSyscall(SYS_PTRACE, uintptr(PTRACE_TRACEME), 0, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// Session ID
+	if sys.Setsid {
+		_, _, err1 = RawSyscall(SYS_SETSID, 0, 0, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// Set process group
+	if sys.Setpgid {
+		_, _, err1 = RawSyscall(SYS_SETPGID, 0, 0, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// Chroot
+	if chroot != nil {
+		_, _, err1 = RawSyscall(SYS_CHROOT, uintptr(unsafe.Pointer(chroot)), 0, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// User and groups
+	if cred := sys.Credential; cred != nil {
+		ngroups := uintptr(len(cred.Groups))
+		groups := uintptr(0)
+		if ngroups > 0 {
+			groups = uintptr(unsafe.Pointer(&cred.Groups[0]))
+		}
+		_, _, err1 = RawSyscall(SYS_SETGROUPS, ngroups, groups, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+		_, _, err1 = RawSyscall(SYS_SETGID, uintptr(cred.Gid), 0, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+		_, _, err1 = RawSyscall(SYS_SETUID, uintptr(cred.Uid), 0, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// Chdir
+	if dir != nil {
+		_, _, err1 = RawSyscall(SYS_CHDIR, uintptr(unsafe.Pointer(dir)), 0, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// Pass 1: look for fd[i] < i and move those up above len(fd)
+	// so that pass 2 won't stomp on an fd it needs later.
+	nextfd = int(len(fd))
+	if pipe < nextfd {
+		_, _, err1 = RawSyscall(SYS_DUP2, uintptr(pipe), uintptr(nextfd), 0)
+		if err1 != 0 {
+			goto childerror
+		}
+		RawSyscall(SYS_FCNTL, uintptr(nextfd), F_SETFD, FD_CLOEXEC)
+		pipe = nextfd
+		nextfd++
+	}
+	for i = 0; i < len(fd); i++ {
+		if fd[i] >= 0 && fd[i] < int(i) {
+			_, _, err1 = RawSyscall(SYS_DUP2, uintptr(fd[i]), uintptr(nextfd), 0)
+			if err1 != 0 {
+				goto childerror
+			}
+			RawSyscall(SYS_FCNTL, uintptr(nextfd), F_SETFD, FD_CLOEXEC)
+			fd[i] = nextfd
+			nextfd++
+			if nextfd == pipe { // don't stomp on pipe
+				nextfd++
+			}
+		}
+	}
+
+	// Pass 2: dup fd[i] down onto i.
+	for i = 0; i < len(fd); i++ {
+		if fd[i] == -1 {
+			RawSyscall(SYS_CLOSE, uintptr(i), 0, 0)
+			continue
+		}
+		if fd[i] == int(i) {
+			// dup2(i, i) won't clear close-on-exec flag on Linux,
+			// probably not elsewhere either.
+			_, _, err1 = RawSyscall(SYS_FCNTL, uintptr(fd[i]), F_SETFD, 0)
+			if err1 != 0 {
+				goto childerror
+			}
+			continue
+		}
+		// The new fd is created NOT close-on-exec,
+		// which is exactly what we want.
+		_, _, err1 = RawSyscall(SYS_DUP2, uintptr(fd[i]), uintptr(i), 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// By convention, we don't close-on-exec the fds we are
+	// started with, so if len(fd) < 3, close 0, 1, 2 as needed.
+	// Programs that know they inherit fds >= 3 will need
+	// to set them close-on-exec.
+	for i = len(fd); i < 3; i++ {
+		RawSyscall(SYS_CLOSE, uintptr(i), 0, 0)
+	}
+
+	// Detach fd 0 from tty
+	if sys.Noctty {
+		_, _, err1 = RawSyscall(SYS_IOCTL, 0, uintptr(TIOCNOTTY), 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// Make fd 0 the tty
+	if sys.Setctty {
+		_, _, err1 = RawSyscall(SYS_IOCTL, 0, uintptr(TIOCSCTTY), 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// Time to exec.
+	_, _, err1 = RawSyscall(SYS_EXECVE,
+		uintptr(unsafe.Pointer(argv0)),
+		uintptr(unsafe.Pointer(&argv[0])),
+		uintptr(unsafe.Pointer(&envv[0])))
+
+childerror:
+	// send error code on pipe
+	RawSyscall(SYS_WRITE, uintptr(pipe), uintptr(unsafe.Pointer(&err1)), unsafe.Sizeof(err1))
+	for {
+		RawSyscall(SYS_EXIT, 253, 0, 0)
+	}
+
+	// Calling panic is not actually safe,
+	// but the for loop above won't break
+	// and this shuts up the compiler.
+	panic("unreached")
+}

src/pkg/syscall/exec_linux.go

@@ -0,0 +1,231 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build linux
+
+package syscall
+
+import (
+	"unsafe"
+)
+
+type SysProcAttr struct {
+	Chroot     string      // Chroot.
+	Credential *Credential // Credential.
+	Ptrace     bool        // Enable tracing.
+	Setsid     bool        // Create session.
+	Setpgid    bool        // Set process group ID to new pid (SYSV setpgrp)
+	Setctty    bool        // Set controlling terminal to fd 0
+	Noctty     bool        // Detach fd 0 from controlling terminal
+	Pdeathsig  int         // Signal that the process will get when its parent dies (Linux only)
+}
+
+// Fork, dup fd onto 0..len(fd), and exec(argv0, argvv, envv) in child.
+// If a dup or exec fails, write the errno error to pipe.
+// (Pipe is close-on-exec so if exec succeeds, it will be closed.)
+// In the child, this function must not acquire any locks, because
+// they might have been locked at the time of the fork.  This means
+// no rescheduling, no malloc calls, and no new stack segments.
+// The calls to RawSyscall are okay because they are assembly
+// functions that do not grow the stack.
+func forkAndExecInChild(argv0 *byte, argv, envv []*byte, chroot, dir *byte, attr *ProcAttr, sys *SysProcAttr, pipe int) (pid int, err Errno) {
+	// Declare all variables at top in case any
+	// declarations require heap allocation (e.g., err1).
+	var (
+		r1     uintptr
+		err1   Errno
+		nextfd int
+		i      int
+	)
+
+	// guard against side effects of shuffling fds below.
+	fd := append([]int(nil), attr.Files...)
+
+	// About to call fork.
+	// No more allocation or calls of non-assembly functions.
+	r1, _, err1 = RawSyscall(SYS_FORK, 0, 0, 0)
+	if err1 != 0 {
+		return 0, err1
+	}
+
+	if r1 != 0 {
+		// parent; return PID
+		return int(r1), 0
+	}
+
+	// Fork succeeded, now in child.
+
+	// Parent death signal
+	if sys.Pdeathsig != 0 {
+		_, _, err1 = RawSyscall6(SYS_PRCTL, PR_SET_PDEATHSIG, uintptr(sys.Pdeathsig), 0, 0, 0, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+
+		// Signal self if parent is already dead. This might cause a
+		// duplicate signal in rare cases, but it won't matter when
+		// using SIGKILL.
+		r1, _, _ = RawSyscall(SYS_GETPPID, 0, 0, 0)
+		if r1 == 1 {
+			pid, _, _ := RawSyscall(SYS_GETPID, 0, 0, 0)
+			_, _, err1 := RawSyscall(SYS_KILL, pid, uintptr(sys.Pdeathsig), 0)
+			if err1 != 0 {
+				goto childerror
+			}
+		}
+	}
+
+	// Enable tracing if requested.
+	if sys.Ptrace {
+		_, _, err1 = RawSyscall(SYS_PTRACE, uintptr(PTRACE_TRACEME), 0, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// Session ID
+	if sys.Setsid {
+		_, _, err1 = RawSyscall(SYS_SETSID, 0, 0, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// Set process group
+	if sys.Setpgid {
+		_, _, err1 = RawSyscall(SYS_SETPGID, 0, 0, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// Chroot
+	if chroot != nil {
+		_, _, err1 = RawSyscall(SYS_CHROOT, uintptr(unsafe.Pointer(chroot)), 0, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// User and groups
+	if cred := sys.Credential; cred != nil {
+		ngroups := uintptr(len(cred.Groups))
+		groups := uintptr(0)
+		if ngroups > 0 {
+			groups = uintptr(unsafe.Pointer(&cred.Groups[0]))
+		}
+		_, _, err1 = RawSyscall(SYS_SETGROUPS, ngroups, groups, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+		_, _, err1 = RawSyscall(SYS_SETGID, uintptr(cred.Gid), 0, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+		_, _, err1 = RawSyscall(SYS_SETUID, uintptr(cred.Uid), 0, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// Chdir
+	if dir != nil {
+		_, _, err1 = RawSyscall(SYS_CHDIR, uintptr(unsafe.Pointer(dir)), 0, 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// Pass 1: look for fd[i] < i and move those up above len(fd)
+	// so that pass 2 won't stomp on an fd it needs later.
+	nextfd = int(len(fd))
+	if pipe < nextfd {
+		_, _, err1 = RawSyscall(SYS_DUP2, uintptr(pipe), uintptr(nextfd), 0)
+		if err1 != 0 {
+			goto childerror
+		}
+		RawSyscall(SYS_FCNTL, uintptr(nextfd), F_SETFD, FD_CLOEXEC)
+		pipe = nextfd
+		nextfd++
+	}
+	for i = 0; i < len(fd); i++ {
+		if fd[i] >= 0 && fd[i] < int(i) {
+			_, _, err1 = RawSyscall(SYS_DUP2, uintptr(fd[i]), uintptr(nextfd), 0)
+			if err1 != 0 {
+				goto childerror
+			}
+			RawSyscall(SYS_FCNTL, uintptr(nextfd), F_SETFD, FD_CLOEXEC)
+			fd[i] = nextfd
+			nextfd++
+			if nextfd == pipe { // don't stomp on pipe
+				nextfd++
+			}
+		}
+	}
+
+	// Pass 2: dup fd[i] down onto i.
+	for i = 0; i < len(fd); i++ {
+		if fd[i] == -1 {
+			RawSyscall(SYS_CLOSE, uintptr(i), 0, 0)
+			continue
+		}
+		if fd[i] == int(i) {
+			// dup2(i, i) won't clear close-on-exec flag on Linux,
+			// probably not elsewhere either.
+			_, _, err1 = RawSyscall(SYS_FCNTL, uintptr(fd[i]), F_SETFD, 0)
+			if err1 != 0 {
+				goto childerror
+			}
+			continue
+		}
+		// The new fd is created NOT close-on-exec,
+		// which is exactly what we want.
+		_, _, err1 = RawSyscall(SYS_DUP2, uintptr(fd[i]), uintptr(i), 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// By convention, we don't close-on-exec the fds we are
+	// started with, so if len(fd) < 3, close 0, 1, 2 as needed.
+	// Programs that know they inherit fds >= 3 will need
+	// to set them close-on-exec.
+	for i = len(fd); i < 3; i++ {
+		RawSyscall(SYS_CLOSE, uintptr(i), 0, 0)
+	}
+
+	// Detach fd 0 from tty
+	if sys.Noctty {
+		_, _, err1 = RawSyscall(SYS_IOCTL, 0, uintptr(TIOCNOTTY), 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// Make fd 0 the tty
+	if sys.Setctty {
+		_, _, err1 = RawSyscall(SYS_IOCTL, 0, uintptr(TIOCSCTTY), 0)
+		if err1 != 0 {
+			goto childerror
+		}
+	}
+
+	// Time to exec.
+	_, _, err1 = RawSyscall(SYS_EXECVE,
+		uintptr(unsafe.Pointer(argv0)),
+		uintptr(unsafe.Pointer(&argv[0])),
+		uintptr(unsafe.Pointer(&envv[0])))
+
+childerror:
+	// send error code on pipe
+	RawSyscall(SYS_WRITE, uintptr(pipe), uintptr(unsafe.Pointer(&err1)), unsafe.Sizeof(err1))
+	for {
+		RawSyscall(SYS_EXIT, 253, 0, 0)
+	}
+
+	// Calling panic is not actually safe,
+	// but the for loop above won't break
+	// and this shuts up the compiler.
+	panic("unreached")
+}

src/pkg/syscall/exec_unix.go

@@ -89,205 +89,6 @@ func SetNonblock(fd int, nonblocking bool) (err error) {
 	return err
 }
 
-// Fork, dup fd onto 0..len(fd), and exec(argv0, argvv, envv) in child.
-// If a dup or exec fails, write the errno error to pipe.
-// (Pipe is close-on-exec so if exec succeeds, it will be closed.)
-// In the child, this function must not acquire any locks, because
-// they might have been locked at the time of the fork.  This means
-// no rescheduling, no malloc calls, and no new stack segments.
-// The calls to RawSyscall are okay because they are assembly
-// functions that do not grow the stack.
-func forkAndExecInChild(argv0 *byte, argv, envv []*byte, chroot, dir *byte, attr *ProcAttr, sys *SysProcAttr, pipe int) (pid int, err Errno) {
-	// Declare all variables at top in case any
-	// declarations require heap allocation (e.g., err1).
-	var (
-		r1, r2 uintptr
-		err1   Errno
-		nextfd int
-		i      int
-	)
-
-	// guard against side effects of shuffling fds below.
-	fd := append([]int(nil), attr.Files...)
-
-	darwin := OS == "darwin"
-
-	// About to call fork.
-	// No more allocation or calls of non-assembly functions.
-	r1, r2, err1 = RawSyscall(SYS_FORK, 0, 0, 0)
-	if err1 != 0 {
-		return 0, err1
-	}
-
-	// On Darwin:
-	//	r1 = child pid in both parent and child.
-	//	r2 = 0 in parent, 1 in child.
-	// Convert to normal Unix r1 = 0 in child.
-	if darwin && r2 == 1 {
-		r1 = 0
-	}
-
-	if r1 != 0 {
-		// parent; return PID
-		return int(r1), 0
-	}
-
-	// Fork succeeded, now in child.
-
-	// Enable tracing if requested.
-	if sys.Ptrace {
-		_, _, err1 = RawSyscall(SYS_PTRACE, uintptr(PTRACE_TRACEME), 0, 0)
-		if err1 != 0 {
-			goto childerror
-		}
-	}
-
-	// Session ID
-	if sys.Setsid {
-		_, _, err1 = RawSyscall(SYS_SETSID, 0, 0, 0)
-		if err1 != 0 {
-			goto childerror
-		}
-	}
-
-	// Set process group
-	if sys.Setpgid {
-		_, _, err1 = RawSyscall(SYS_SETPGID, 0, 0, 0)
-		if err1 != 0 {
-			goto childerror
-		}
-	}
-
-	// Chroot
-	if chroot != nil {
-		_, _, err1 = RawSyscall(SYS_CHROOT, uintptr(unsafe.Pointer(chroot)), 0, 0)
-		if err1 != 0 {
-			goto childerror
-		}
-	}
-
-	// User and groups
-	if cred := sys.Credential; cred != nil {
-		ngroups := uintptr(len(cred.Groups))
-		groups := uintptr(0)
-		if ngroups > 0 {
-			groups = uintptr(unsafe.Pointer(&cred.Groups[0]))
-		}
-		_, _, err1 = RawSyscall(SYS_SETGROUPS, ngroups, groups, 0)
-		if err1 != 0 {
-			goto childerror
-		}
-		_, _, err1 = RawSyscall(SYS_SETGID, uintptr(cred.Gid), 0, 0)
-		if err1 != 0 {
-			goto childerror
-		}
-		_, _, err1 = RawSyscall(SYS_SETUID, uintptr(cred.Uid), 0, 0)
-		if err1 != 0 {
-			goto childerror
-		}
-	}
-
-	// Chdir
-	if dir != nil {
-		_, _, err1 = RawSyscall(SYS_CHDIR, uintptr(unsafe.Pointer(dir)), 0, 0)
-		if err1 != 0 {
-			goto childerror
-		}
-	}
-
-	// Pass 1: look for fd[i] < i and move those up above len(fd)
-	// so that pass 2 won't stomp on an fd it needs later.
-	nextfd = int(len(fd))
-	if pipe < nextfd {
-		_, _, err1 = RawSyscall(SYS_DUP2, uintptr(pipe), uintptr(nextfd), 0)
-		if err1 != 0 {
-			goto childerror
-		}
-		RawSyscall(SYS_FCNTL, uintptr(nextfd), F_SETFD, FD_CLOEXEC)
-		pipe = nextfd
-		nextfd++
-	}
-	for i = 0; i < len(fd); i++ {
-		if fd[i] >= 0 && fd[i] < int(i) {
-			_, _, err1 = RawSyscall(SYS_DUP2, uintptr(fd[i]), uintptr(nextfd), 0)
-			if err1 != 0 {
-				goto childerror
-			}
-			RawSyscall(SYS_FCNTL, uintptr(nextfd), F_SETFD, FD_CLOEXEC)
-			fd[i] = nextfd
-			nextfd++
-			if nextfd == pipe { // don't stomp on pipe
-				nextfd++
-			}
-		}
-	}
-
-	// Pass 2: dup fd[i] down onto i.
-	for i = 0; i < len(fd); i++ {
-		if fd[i] == -1 {
-			RawSyscall(SYS_CLOSE, uintptr(i), 0, 0)
-			continue
-		}
-		if fd[i] == int(i) {
-			// dup2(i, i) won't clear close-on-exec flag on Linux,
-			// probably not elsewhere either.
-			_, _, err1 = RawSyscall(SYS_FCNTL, uintptr(fd[i]), F_SETFD, 0)
-			if err1 != 0 {
-				goto childerror
-			}
-			continue
-		}
-		// The new fd is created NOT close-on-exec,
-		// which is exactly what we want.
-		_, _, err1 = RawSyscall(SYS_DUP2, uintptr(fd[i]), uintptr(i), 0)
-		if err1 != 0 {
-			goto childerror
-		}
-	}
-
-	// By convention, we don't close-on-exec the fds we are
-	// started with, so if len(fd) < 3, close 0, 1, 2 as needed.
-	// Programs that know they inherit fds >= 3 will need
-	// to set them close-on-exec.
-	for i = len(fd); i < 3; i++ {
-		RawSyscall(SYS_CLOSE, uintptr(i), 0, 0)
-	}
-
-	// Detach fd 0 from tty
-	if sys.Noctty {
-		_, _, err1 = RawSyscall(SYS_IOCTL, 0, uintptr(TIOCNOTTY), 0)
-		if err1 != 0 {
-			goto childerror
-		}
-	}
-
-	// Make fd 0 the tty
-	if sys.Setctty {
-		_, _, err1 = RawSyscall(SYS_IOCTL, 0, uintptr(TIOCSCTTY), 0)
-		if err1 != 0 {
-			goto childerror
-		}
-	}
-
-	// Time to exec.
-	_, _, err1 = RawSyscall(SYS_EXECVE,
-		uintptr(unsafe.Pointer(argv0)),
-		uintptr(unsafe.Pointer(&argv[0])),
-		uintptr(unsafe.Pointer(&envv[0])))
-
-childerror:
-	// send error code on pipe
-	RawSyscall(SYS_WRITE, uintptr(pipe), uintptr(unsafe.Pointer(&err1)), unsafe.Sizeof(err1))
-	for {
-		RawSyscall(SYS_EXIT, 253, 0, 0)
-	}
-
-	// Calling panic is not actually safe,
-	// but the for loop above won't break
-	// and this shuts up the compiler.
-	panic("unreached")
-}
-
 // Credential holds user and group identities to be assumed
 // by a child process started by StartProcess.
 type Credential struct {
@@ -305,16 +106,6 @@ type ProcAttr struct {
 	Sys   *SysProcAttr
 }
 
-type SysProcAttr struct {
-	Chroot     string      // Chroot.
-	Credential *Credential // Credential.
-	Ptrace     bool        // Enable tracing.
-	Setsid     bool        // Create session.
-	Setpgid    bool        // Set process group ID to new pid (SYSV setpgrp)
-	Setctty    bool        // Set controlling terminal to fd 0
-	Noctty     bool        // Detach fd 0 from controlling terminal
-}
-
 var zeroProcAttr ProcAttr
 var zeroSysProcAttr SysProcAttr
 

src/pkg/syscall/mkerrors.sh

@@ -67,6 +67,7 @@ includes_Linux='
 #include <sys/ioctl.h>
 #include <sys/mman.h>
 #include <sys/mount.h>
+#include <sys/prctl.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <linux/if_addr.h>
@@ -176,7 +177,7 @@ ccflags="$@"
 		$2 ~ /^SIG[^_]/ ||
 		$2 ~ /^IN_/ ||
 		$2 ~ /^LOCK_(SH|EX|NB|UN)$/ ||
-		$2 ~ /^(AF|SOCK|SO|SOL|IPPROTO|IP|IPV6|TCP|EVFILT|EV|SHUT|PROT|MAP|PACKET|MSG|SCM|MCL|DT|MADV)_/ ||
+		$2 ~ /^(AF|SOCK|SO|SOL|IPPROTO|IP|IPV6|TCP|EVFILT|EV|SHUT|PROT|MAP|PACKET|MSG|SCM|MCL|DT|MADV|PR)_/ ||
 		$2 == "SOMAXCONN" ||
 		$2 == "NAME_MAX" ||
 		$2 == "IFNAMSIZ" ||

src/pkg/syscall/zerrors_linux_386.go

@@ -659,6 +659,64 @@ const (
 	PROT_NONE                        = 0x0
 	PROT_READ                        = 0x1
 	PROT_WRITE                       = 0x2
+	PR_CAPBSET_DROP                  = 0x18
+	PR_CAPBSET_READ                  = 0x17
+	PR_ENDIAN_BIG                    = 0x0
+	PR_ENDIAN_LITTLE                 = 0x1
+	PR_ENDIAN_PPC_LITTLE             = 0x2
+	PR_FPEMU_NOPRINT                 = 0x1
+	PR_FPEMU_SIGFPE                  = 0x2
+	PR_FP_EXC_ASYNC                  = 0x2
+	PR_FP_EXC_DISABLED               = 0x0
+	PR_FP_EXC_DIV                    = 0x10000
+	PR_FP_EXC_INV                    = 0x100000
+	PR_FP_EXC_NONRECOV               = 0x1
+	PR_FP_EXC_OVF                    = 0x20000
+	PR_FP_EXC_PRECISE                = 0x3
+	PR_FP_EXC_RES                    = 0x80000
+	PR_FP_EXC_SW_ENABLE              = 0x80
+	PR_FP_EXC_UND                    = 0x40000
+	PR_GET_DUMPABLE                  = 0x3
+	PR_GET_ENDIAN                    = 0x13
+	PR_GET_FPEMU                     = 0x9
+	PR_GET_FPEXC                     = 0xb
+	PR_GET_KEEPCAPS                  = 0x7
+	PR_GET_NAME                      = 0x10
+	PR_GET_PDEATHSIG                 = 0x2
+	PR_GET_SECCOMP                   = 0x15
+	PR_GET_SECUREBITS                = 0x1b
+	PR_GET_TIMERSLACK                = 0x1e
+	PR_GET_TIMING                    = 0xd
+	PR_GET_TSC                       = 0x19
+	PR_GET_UNALIGN                   = 0x5
+	PR_MCE_KILL                      = 0x21
+	PR_MCE_KILL_CLEAR                = 0x0
+	PR_MCE_KILL_DEFAULT              = 0x2
+	PR_MCE_KILL_EARLY                = 0x1
+	PR_MCE_KILL_GET                  = 0x22
+	PR_MCE_KILL_LATE                 = 0x0
+	PR_MCE_KILL_SET                  = 0x1
+	PR_SET_DUMPABLE                  = 0x4
+	PR_SET_ENDIAN                    = 0x14
+	PR_SET_FPEMU                     = 0xa
+	PR_SET_FPEXC                     = 0xc
+	PR_SET_KEEPCAPS                  = 0x8
+	PR_SET_NAME                      = 0xf
+	PR_SET_PDEATHSIG                 = 0x1
+	PR_SET_SECCOMP                   = 0x16
+	PR_SET_SECUREBITS                = 0x1c
+	PR_SET_TIMERSLACK                = 0x1d
+	PR_SET_TIMING                    = 0xe
+	PR_SET_TSC                       = 0x1a
+	PR_SET_UNALIGN                   = 0x6
+	PR_TASK_PERF_EVENTS_DISABLE      = 0x1f
+	PR_TASK_PERF_EVENTS_ENABLE       = 0x20
+	PR_TIMING_STATISTICAL            = 0x0
+	PR_TIMING_TIMESTAMP              = 0x1
+	PR_TSC_ENABLE                    = 0x1
+	PR_TSC_SIGSEGV                   = 0x2
+	PR_UNALIGN_NOPRINT               = 0x1
+	PR_UNALIGN_SIGBUS                = 0x2
 	PTRACE_ATTACH                    = 0x10
 	PTRACE_CONT                      = 0x7
 	PTRACE_DETACH                    = 0x11

src/pkg/syscall/zerrors_linux_amd64.go

@@ -659,6 +659,64 @@ const (
 	PROT_NONE                        = 0x0
 	PROT_READ                        = 0x1
 	PROT_WRITE                       = 0x2
+	PR_CAPBSET_DROP                  = 0x18
+	PR_CAPBSET_READ                  = 0x17
+	PR_ENDIAN_BIG                    = 0x0
+	PR_ENDIAN_LITTLE                 = 0x1
+	PR_ENDIAN_PPC_LITTLE             = 0x2
+	PR_FPEMU_NOPRINT                 = 0x1
+	PR_FPEMU_SIGFPE                  = 0x2
+	PR_FP_EXC_ASYNC                  = 0x2
+	PR_FP_EXC_DISABLED               = 0x0
+	PR_FP_EXC_DIV                    = 0x10000
+	PR_FP_EXC_INV                    = 0x100000
+	PR_FP_EXC_NONRECOV               = 0x1
+	PR_FP_EXC_OVF                    = 0x20000
+	PR_FP_EXC_PRECISE                = 0x3
+	PR_FP_EXC_RES                    = 0x80000
+	PR_FP_EXC_SW_ENABLE              = 0x80
+	PR_FP_EXC_UND                    = 0x40000
+	PR_GET_DUMPABLE                  = 0x3
+	PR_GET_ENDIAN                    = 0x13
+	PR_GET_FPEMU                     = 0x9
+	PR_GET_FPEXC                     = 0xb
+	PR_GET_KEEPCAPS                  = 0x7
+	PR_GET_NAME                      = 0x10
+	PR_GET_PDEATHSIG                 = 0x2
+	PR_GET_SECCOMP                   = 0x15
+	PR_GET_SECUREBITS                = 0x1b
+	PR_GET_TIMERSLACK                = 0x1e
+	PR_GET_TIMING                    = 0xd
+	PR_GET_TSC                       = 0x19
+	PR_GET_UNALIGN                   = 0x5
+	PR_MCE_KILL                      = 0x21
+	PR_MCE_KILL_CLEAR                = 0x0
+	PR_MCE_KILL_DEFAULT              = 0x2
+	PR_MCE_KILL_EARLY                = 0x1
+	PR_MCE_KILL_GET                  = 0x22
+	PR_MCE_KILL_LATE                 = 0x0
+	PR_MCE_KILL_SET                  = 0x1
+	PR_SET_DUMPABLE                  = 0x4
+	PR_SET_ENDIAN                    = 0x14
+	PR_SET_FPEMU                     = 0xa
+	PR_SET_FPEXC                     = 0xc
+	PR_SET_KEEPCAPS                  = 0x8
+	PR_SET_NAME                      = 0xf
+	PR_SET_PDEATHSIG                 = 0x1
+	PR_SET_SECCOMP                   = 0x16
+	PR_SET_SECUREBITS                = 0x1c
+	PR_SET_TIMERSLACK                = 0x1d
+	PR_SET_TIMING                    = 0xe
+	PR_SET_TSC                       = 0x1a
+	PR_SET_UNALIGN                   = 0x6
+	PR_TASK_PERF_EVENTS_DISABLE      = 0x1f
+	PR_TASK_PERF_EVENTS_ENABLE       = 0x20
+	PR_TIMING_STATISTICAL            = 0x0
+	PR_TIMING_TIMESTAMP              = 0x1
+	PR_TSC_ENABLE                    = 0x1
+	PR_TSC_SIGSEGV                   = 0x2
+	PR_UNALIGN_NOPRINT               = 0x1
+	PR_UNALIGN_SIGBUS                = 0x2
 	PTRACE_ARCH_PRCTL                = 0x1e
 	PTRACE_ATTACH                    = 0x10
 	PTRACE_CONT                      = 0x7

src/pkg/syscall/zerrors_linux_arm.go

@@ -623,6 +623,64 @@ const (
 	PROT_NONE                        = 0x0
 	PROT_READ                        = 0x1
 	PROT_WRITE                       = 0x2
+	PR_CAPBSET_DROP                  = 0x18
+	PR_CAPBSET_READ                  = 0x17
+	PR_ENDIAN_BIG                    = 0x0
+	PR_ENDIAN_LITTLE                 = 0x1
+	PR_ENDIAN_PPC_LITTLE             = 0x2
+	PR_FPEMU_NOPRINT                 = 0x1
+	PR_FPEMU_SIGFPE                  = 0x2
+	PR_FP_EXC_ASYNC                  = 0x2
+	PR_FP_EXC_DISABLED               = 0x0
+	PR_FP_EXC_DIV                    = 0x10000
+	PR_FP_EXC_INV                    = 0x100000
+	PR_FP_EXC_NONRECOV               = 0x1
+	PR_FP_EXC_OVF                    = 0x20000
+	PR_FP_EXC_PRECISE                = 0x3
+	PR_FP_EXC_RES                    = 0x80000
+	PR_FP_EXC_SW_ENABLE              = 0x80
+	PR_FP_EXC_UND                    = 0x40000
+	PR_GET_DUMPABLE                  = 0x3
+	PR_GET_ENDIAN                    = 0x13
+	PR_GET_FPEMU                     = 0x9
+	PR_GET_FPEXC                     = 0xb
+	PR_GET_KEEPCAPS                  = 0x7
+	PR_GET_NAME                      = 0x10
+	PR_GET_PDEATHSIG                 = 0x2
+	PR_GET_SECCOMP                   = 0x15
+	PR_GET_SECUREBITS                = 0x1b
+	PR_GET_TIMERSLACK                = 0x1e
+	PR_GET_TIMING                    = 0xd
+	PR_GET_TSC                       = 0x19
+	PR_GET_UNALIGN                   = 0x5
+	PR_MCE_KILL                      = 0x21
+	PR_MCE_KILL_CLEAR                = 0x0
+	PR_MCE_KILL_DEFAULT              = 0x2
+	PR_MCE_KILL_EARLY                = 0x1
+	PR_MCE_KILL_GET                  = 0x22
+	PR_MCE_KILL_LATE                 = 0x0
+	PR_MCE_KILL_SET                  = 0x1
+	PR_SET_DUMPABLE                  = 0x4
+	PR_SET_ENDIAN                    = 0x14
+	PR_SET_FPEMU                     = 0xa
+	PR_SET_FPEXC                     = 0xc
+	PR_SET_KEEPCAPS                  = 0x8
+	PR_SET_NAME                      = 0xf
+	PR_SET_PDEATHSIG                 = 0x1
+	PR_SET_SECCOMP                   = 0x16
+	PR_SET_SECUREBITS                = 0x1c
+	PR_SET_TIMERSLACK                = 0x1d
+	PR_SET_TIMING                    = 0xe
+	PR_SET_TSC                       = 0x1a
+	PR_SET_UNALIGN                   = 0x6
+	PR_TASK_PERF_EVENTS_DISABLE      = 0x1f
+	PR_TASK_PERF_EVENTS_ENABLE       = 0x20
+	PR_TIMING_STATISTICAL            = 0x0
+	PR_TIMING_TIMESTAMP              = 0x1
+	PR_TSC_ENABLE                    = 0x1
+	PR_TSC_SIGSEGV                   = 0x2
+	PR_UNALIGN_NOPRINT               = 0x1
+	PR_UNALIGN_SIGBUS                = 0x2
 	PTRACE_ATTACH                    = 0x10
 	PTRACE_CONT                      = 0x7
 	PTRACE_DETACH                    = 0x11