syscall: workaround for getsockname bug in AIX

Reviewed-on: https://go-review.googlesource.com/64552

From-SVN: r253021

gcc/go/gofrontend/MERGE

@@ -1,4 +1,4 @@
-90fe3da36d904b62d47c00ee40eef4fd2693a5da
+84f827669dc76326ed99ebcc982c482aa148d8d8
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/go/syscall/socket_aix.go

@@ -0,0 +1,89 @@
+// socket_aix.go -- Socket handling specific to AIX.
+
+// Copyright 2017 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.
+
+package syscall
+
+import "unsafe"
+
+const SizeofSockaddrInet4 = 16
+const SizeofSockaddrInet6 = 28
+const SizeofSockaddrUnix = 1025
+
+type RawSockaddrInet4 struct {
+	Len    uint8
+	Family uint8
+	Port   uint16
+	Addr   [4]byte /* in_addr */
+	Zero   [8]uint8
+}
+
+func (sa *RawSockaddrInet4) setLen() Socklen_t {
+	sa.Len = SizeofSockaddrInet4
+	return SizeofSockaddrInet4
+}
+
+type RawSockaddrInet6 struct {
+	Len      uint8
+	Family   uint8
+	Port     uint16
+	Flowinfo uint32
+	Addr     [16]byte /* in6_addr */
+	Scope_id uint32
+}
+
+func (sa *RawSockaddrInet6) setLen() Socklen_t {
+	sa.Len = SizeofSockaddrInet6
+	return SizeofSockaddrInet6
+}
+
+type RawSockaddrUnix struct {
+	Len    uint8
+	Family uint8
+	Path   [1023]int8
+}
+
+func (sa *RawSockaddrUnix) setLen(n int) {
+	sa.Len = uint8(3 + n) // 2 for Family, Len; 1 for NUL.
+}
+
+func (sa *RawSockaddrUnix) getLen() (int, error) {
+	// Some versions of AIX have a bug in getsockname (see IV78655).
+	// We can't rely on sa.Len being set correctly.
+	n := SizeofSockaddrUnix - 3 // substract leading Family, Len, terminating NUL.
+	for i := 0; i < n; i++ {
+		if sa.Path[i] == 0 {
+			n = i
+			break
+		}
+	}
+	return n, nil
+}
+
+func (sa *RawSockaddrUnix) adjustAbstract(sl Socklen_t) Socklen_t {
+	return sl
+}
+
+type RawSockaddr struct {
+	Len    uint8
+	Family uint8
+	Data   [14]int8
+}
+
+// BindToDevice binds the socket associated with fd to device.
+func BindToDevice(fd int, device string) (err error) {
+	return ENOSYS
+}
+
+func anyToSockaddrOS(rsa *RawSockaddrAny) (Sockaddr, error) {
+	return nil, EAFNOSUPPORT
+}
+
+func GetsockoptIPv6MTUInfo(fd, level, opt int) (*IPv6MTUInfo, error) {
+	var value IPv6MTUInfo
+	vallen := Socklen_t(SizeofIPv6MTUInfo)
+	err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
+	return &value, err
+}

libgo/go/syscall/socket_bsd.go

@@ -4,7 +4,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build aix darwin dragonfly freebsd openbsd netbsd
+// +build darwin dragonfly freebsd openbsd netbsd
 
 package syscall
 

libgo/go/syscall/syscall_aix_ppc.go

@@ -0,0 +1,49 @@
+// syscall_aix_ppc.go -- AIX 32-bit specific support
+
+// Copyright 2017 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.
+
+package syscall
+
+import "unsafe"
+
+// AIX does not define a specific structure but instead uses separate
+// ptrace calls for the different registers.
+type PtraceRegs struct {
+	Gpr [32]uint32
+	Iar uint32
+	Msr uint32
+	Cr  uint32
+	Lr  uint32
+	Ctr uint32
+	Xer uint32
+}
+
+func (r *PtraceRegs) PC() uint64 { return uint64(r.Iar) }
+
+func (r *PtraceRegs) SetPC(pc uint64) { r.Iar = uint32(pc) }
+
+func PtraceGetRegs(pid int, regsout *PtraceRegs) (err error) {
+	ptrace(_PT_REGSET, pid, uintptr(unsafe.Pointer(&regsout.Gpr[0])), 0, 0)
+	regsout.Iar = uint32(ptrace(_PT_READ_GPR, pid, 128, 0, 0))
+	regsout.Msr = uint32(ptrace(_PT_READ_GPR, pid, 129, 0, 0))
+	regsout.Cr = uint32(ptrace(_PT_READ_GPR, pid, 130, 0, 0))
+	regsout.Lr = uint32(ptrace(_PT_READ_GPR, pid, 131, 0, 0))
+	regsout.Ctr = uint32(ptrace(_PT_READ_GPR, pid, 132, 0, 0))
+	regsout.Xer = uint32(ptrace(_PT_READ_GPR, pid, 133, 0, 0))
+	return nil
+}
+
+func PtraceSetRegs(pid int, regs *PtraceRegs) (err error) {
+	for i := 0; i < len(regs.Gpr); i++ {
+		ptrace(_PT_WRITE_GPR, pid, uintptr(i), int(regs.Gpr[i]), 0)
+	}
+	ptrace(_PT_WRITE_GPR, pid, 128, int(regs.Iar), 0)
+	ptrace(_PT_WRITE_GPR, pid, 129, int(regs.Msr), 0)
+	ptrace(_PT_WRITE_GPR, pid, 130, int(regs.Cr), 0)
+	ptrace(_PT_WRITE_GPR, pid, 131, int(regs.Lr), 0)
+	ptrace(_PT_WRITE_GPR, pid, 132, int(regs.Ctr), 0)
+	ptrace(_PT_WRITE_GPR, pid, 133, int(regs.Xer), 0)
+	return nil
+}

libgo/go/syscall/syscall_aix_ppc64.go

@@ -0,0 +1,49 @@
+// syscall_aix_ppc64.go -- AIX 64-bit specific support
+
+// Copyright 2017 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.
+
+package syscall
+
+import "unsafe"
+
+// AIX does not define a specific structure but instead uses separate
+// ptrace calls for the different registers.
+type PtraceRegs struct {
+	Gpr [32]uint64
+	Iar uint64
+	Msr uint64
+	Cr  uint64
+	Lr  uint64
+	Ctr uint64
+	Xer uint64
+}
+
+func (r *PtraceRegs) PC() uint64 { return r.Iar }
+
+func (r *PtraceRegs) SetPC(pc uint64) { r.Iar = pc }
+
+func PtraceGetRegs(pid int, regsout *PtraceRegs) (err error) {
+	ptrace64(_PT_REGSET, int64(pid), int64(uintptr(unsafe.Pointer(&regsout.Gpr[0]))), 0, 0)
+	ptrace64(_PT_READ_GPR, int64(pid), 128, 0, uintptr(unsafe.Pointer(&regsout.Iar)))
+	ptrace64(_PT_READ_GPR, int64(pid), 129, 0, uintptr(unsafe.Pointer(&regsout.Msr)))
+	ptrace64(_PT_READ_GPR, int64(pid), 130, 0, uintptr(unsafe.Pointer(&regsout.Cr)))
+	ptrace64(_PT_READ_GPR, int64(pid), 131, 0, uintptr(unsafe.Pointer(&regsout.Lr)))
+	ptrace64(_PT_READ_GPR, int64(pid), 132, 0, uintptr(unsafe.Pointer(&regsout.Ctr)))
+	ptrace64(_PT_READ_GPR, int64(pid), 133, 0, uintptr(unsafe.Pointer(&regsout.Xer)))
+	return nil
+}
+
+func PtraceSetRegs(pid int, regs *PtraceRegs) (err error) {
+	for i := 0; i < len(regs.Gpr); i++ {
+		ptrace64(_PT_WRITE_GPR, int64(pid), int64(i), 0, uintptr(unsafe.Pointer(&regs.Gpr[i])))
+	}
+	ptrace64(_PT_WRITE_GPR, int64(pid), 128, 0, uintptr(unsafe.Pointer(&regs.Iar)))
+	ptrace64(_PT_WRITE_GPR, int64(pid), 129, 0, uintptr(unsafe.Pointer(&regs.Msr)))
+	ptrace64(_PT_WRITE_GPR, int64(pid), 130, 0, uintptr(unsafe.Pointer(&regs.Cr)))
+	ptrace64(_PT_WRITE_GPR, int64(pid), 131, 0, uintptr(unsafe.Pointer(&regs.Lr)))
+	ptrace64(_PT_WRITE_GPR, int64(pid), 132, 0, uintptr(unsafe.Pointer(&regs.Ctr)))
+	ptrace64(_PT_WRITE_GPR, int64(pid), 133, 0, uintptr(unsafe.Pointer(&regs.Xer)))
+	return nil
+}