syscall, golang_org/x/net/lif: fixes for gccgo on Solaris

Reviewed-on: https://go-review.googlesource.com/35390

From-SVN: r244563

gcc/go/gofrontend/MERGE

@@ -1,4 +1,4 @@
-223cba75b947afc1ee5a13a60c15c66f6ff355c1
+2b3d389f961b8461b3fdf42318a628f68b56f8b1
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/go/golang_org/x/net/lif/link.go

@@ -84,7 +84,7 @@ func links(eps []endpoint, name string) ([]Link, error) {
 		b := make([]byte, lifn.Count*sizeofLifreq)
 		lifc.Family = uint16(ep.af)
 		lifc.Len = lifn.Count * sizeofLifreq
-		littleEndian.PutUint64(lifc.Lifcu[:], uint64(uintptr(unsafe.Pointer(&b[0]))))
+		lifc.Lifcu = unsafe.Pointer(&b[0])
 		ioc = int64(sysSIOCGLIFCONF)
 		if err := ioctl(ep.s, uintptr(ioc), unsafe.Pointer(&lifc)); err != nil {
 			continue

libgo/go/golang_org/x/net/lif/syscall.go

@@ -11,23 +11,12 @@ import (
 	"unsafe"
 )
 
-//go:cgo_import_dynamic libc_ioctl ioctl "libc.so"
-
-//go:linkname procIoctl libc_ioctl
-
-var procIoctl uintptr
-
-func sysvicall6(trap, nargs, a1, a2, a3, a4, a5, a6 uintptr) (uintptr, uintptr, syscall.Errno)
-
-// TODO: replace with runtime.KeepAlive when available
-//go:noescape
-func keepAlive(p unsafe.Pointer)
+//extern __go_ioctl_ptr
+func libc_ioctl(int32, int32, unsafe.Pointer) int32
 
 func ioctl(s, ioc uintptr, arg unsafe.Pointer) error {
-	_, _, errno := sysvicall6(uintptr(unsafe.Pointer(&procIoctl)), 3, s, ioc, uintptr(arg), 0, 0, 0)
-	keepAlive(arg)
-	if errno != 0 {
-		return error(errno)
+	if libc_ioctl(int32(s), int32(ioc), arg) < 0 {
+		return syscall.GetErrno()
 	}
 	return nil
 }

libgo/go/golang_org/x/net/lif/zsys_solaris.go

@@ -3,6 +3,8 @@
 
 package lif
 
+import "unsafe"
+
 const (
 	sysAF_UNSPEC = 0x0
 	sysAF_INET   = 0x2
@@ -59,15 +61,11 @@ const (
 )
 
 const (
-	sizeofLifnum       = 0xc
 	sizeofLifreq       = 0x178
-	sizeofLifconf      = 0x18
-	sizeofLifIfinfoReq = 0x10
 )
 
 type sysLifnum struct {
 	Family    uint16
-	Pad_cgo_0 [2]byte
 	Flags     int32
 	Count     int32
 }
@@ -81,16 +79,13 @@ type lifreq struct {
 
 type lifconf struct {
 	Family    uint16
-	Pad_cgo_0 [2]byte
 	Flags     int32
 	Len       int32
-	Pad_cgo_1 [4]byte
-	Lifcu     [8]byte
+	Lifcu     unsafe.Pointer
 }
 
 type lifIfinfoReq struct {
 	Maxhops      uint8
-	Pad_cgo_0    [3]byte
 	Reachtime    uint32
 	Reachretrans uint32
 	Maxmtu       uint32

libgo/go/syscall/syscall_solaris.go

@@ -29,3 +29,20 @@ func direntNamlen(buf []byte) (uint64, bool) {
 	}
 	return reclen - uint64(unsafe.Offsetof(Dirent{}.Name)), true
 }
+
+//sysnb getexecname() (execname unsafe.Pointer, err error)
+//getexecname() *byte
+
+func Getexecname() (path string, err error) {
+	ptr, err := getexecname()
+	if err != nil {
+		return "", err
+	}
+	bytes := (*[1 << 29]byte)(ptr)[:]
+	for i, b := range bytes {
+		if b == 0 {
+			return string(bytes[:i]), nil
+		}
+	}
+	panic("unreachable")
+}