fixing (badly) linux_arm syscall.

R=rsc
http://go/go-review/1017037

src/pkg/syscall/syscall_linux_arm.go

@@ -34,6 +34,8 @@ func NsecToTimeval(nsec int64) (tv Timeval) {
 //sys	socket(domain int, typ int, proto int) (fd int, errno int)
 //sys	getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int)
 //sys	getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (errno int)
+//sys	recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, errno int)
+//sys	sendto(s int, buf []byte, flags int, to uintptr, addrlen _Socklen) (errno int)
 
 //sys	Chown(path string, uid int, gid int) (errno int)
 //sys	Fchown(fd int, uid int, gid int) (errno int)

src/pkg/syscall/zerrors_linux_arm.go

@@ -176,6 +176,7 @@ const (
 	SIGINT		= 0x2;
 	SIGIOT		= 0x6;
 	SIGTERM		= 0xf;
+	O_EXCL					= 0x80;
 )
 
 // Types

src/pkg/syscall/zsyscall_linux_arm.go

@@ -775,3 +775,24 @@ func Statfs(path string, buf *Statfs_t) (errno int) {
 	errno = int(e1);
 	return;
 }
+
+func recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, errno int) {
+	var _p0 *byte;
+	if len(p) > 0 {
+		_p0 = &p[0];
+	}
+	r0, _, e1 := Syscall6(SYS_RECVFROM, uintptr(fd), uintptr(unsafe.Pointer(_p0)), uintptr(len(p)), uintptr(flags), uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(fromlen)));
+	n = int(r0);
+	errno = int(e1);
+	return;
+}
+
+func sendto(s int, buf []byte, flags int, to uintptr, addrlen _Socklen) (errno int) {
+	var _p0 *byte;
+	if len(buf) > 0 {
+		_p0 = &buf[0];
+	}
+	_, _, e1 := Syscall6(SYS_SENDTO, uintptr(s), uintptr(unsafe.Pointer(_p0)), uintptr(len(buf)), uintptr(flags), uintptr(to), uintptr(addrlen));
+	errno = int(e1);
+	return;
+}

src/pkg/syscall/ztypes_linux_arm.go

@@ -77,29 +77,29 @@ const (
 	SizeofSockaddrInet6	= 0x1c;
 	SizeofSockaddrAny	= 0x1c;
 	SizeofSockaddrUnix	= 0x6e;
-	_PTRACE_TRACEME		= 0;
-	_PTRACE_PEEKTEXT	= 0x1;
-	_PTRACE_PEEKDATA	= 0x2;
-	_PTRACE_PEEKUSER	= 0x3;
-	_PTRACE_POKETEXT	= 0x4;
-	_PTRACE_POKEDATA	= 0x5;
-	_PTRACE_POKEUSER	= 0x6;
-	_PTRACE_CONT		= 0x7;
-	_PTRACE_KILL		= 0x8;
-	_PTRACE_SINGLESTEP	= 0x9;
-	_PTRACE_GETREGS		= 0xc;
-	_PTRACE_SETREGS		= 0xd;
-	_PTRACE_GETFPREGS	= 0xe;
-	_PTRACE_SETFPREGS	= 0xf;
-	_PTRACE_ATTACH		= 0x10;
-	_PTRACE_DETACH		= 0x11;
-	_PTRACE_GETFPXREGS	= 0x12;
-	_PTRACE_SETFPXREGS	= 0x13;
-	_PTRACE_SYSCALL		= 0x18;
-	_PTRACE_SETOPTIONS	= 0x4200;
-	_PTRACE_GETEVENTMSG	= 0x4201;
-	_PTRACE_GETSIGINFO	= 0x4202;
-	_PTRACE_SETSIGINFO	= 0x4203;
+	PTRACE_TRACEME		= 0;
+	PTRACE_PEEKTEXT	= 0x1;
+	PTRACE_PEEKDATA	= 0x2;
+	PTRACE_PEEKUSER	= 0x3;
+	PTRACE_POKETEXT	= 0x4;
+	PTRACE_POKEDATA	= 0x5;
+	PTRACE_POKEUSER	= 0x6;
+	PTRACE_CONT		= 0x7;
+	PTRACE_KILL		= 0x8;
+	PTRACE_SINGLESTEP	= 0x9;
+	PTRACE_GETREGS		= 0xc;
+	PTRACE_SETREGS		= 0xd;
+	PTRACE_GETFPREGS	= 0xe;
+	PTRACE_SETFPREGS	= 0xf;
+	PTRACE_ATTACH		= 0x10;
+	PTRACE_DETACH		= 0x11;
+	PTRACE_GETFPXREGS	= 0x12;
+	PTRACE_SETFPXREGS	= 0x13;
+	PTRACE_SYSCALL		= 0x18;
+	PTRACE_SETOPTIONS	= 0x4200;
+	PTRACE_GETEVENTMSG	= 0x4201;
+	PTRACE_GETSIGINFO	= 0x4202;
+	PTRACE_SETSIGINFO	= 0x4203;
 	PTRACE_O_TRACESYSGOOD	= 0x1;
 	PTRACE_O_TRACEFORK	= 0x2;
 	PTRACE_O_TRACEVFORK	= 0x4;