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// socket.go -- Socket handling.
// Copyright 2009 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.
// Low-level socket interface.
// Only for implementing net package.
// DO NOT USE DIRECTLY.
package syscall
import "unsafe"
const SizeofSockaddrInet4 = 16
const SizeofSockaddrInet6 = 28
const SizeofSockaddrUnix = 110
type RawSockaddrAny struct {
Addr RawSockaddr;
Pad [12]int8;
}
const SizeofSockaddrAny = 0x1c;
// For testing: clients can set this flag to force
// creation of IPv6 sockets to return EAFNOSUPPORT.
var SocketDisableIPv6 bool
type Sockaddr interface {
sockaddr() (ptr *RawSockaddrAny, len Socklen_t, errno int); // lowercase; only we can define Sockaddrs
}
type SockaddrInet4 struct {
Port int;
Addr [4]byte;
raw RawSockaddrInet4;
}
type SockaddrInet6 struct {
Port int;
Addr [16]byte;
raw RawSockaddrInet6;
}
type SockaddrUnix struct {
Name string;
raw RawSockaddrUnix;
}
type Linger struct {
Onoff int32;
Linger int32;
}
func libc_accept(fd int, sa *RawSockaddrAny, len *Socklen_t) int __asm__ ("accept");
func libc_bind(fd int, sa *RawSockaddrAny, len Socklen_t) int __asm__ ("bind");
func libc_connect(fd int, sa *RawSockaddrAny, len Socklen_t) int __asm__ ("connect");
func libc_socket(domain, typ, protocol int) int __asm__ ("socket");
func libc_setsockopt(fd, level, optname int, optval *byte, optlen Socklen_t) int __asm__ ("setsockopt");
func libc_listen(fd, backlog int) int __asm__ ("listen");
func libc_getsockopt(fd, level, optname int, optval *byte, optlen *Socklen_t) int __asm__ ("getsockopt");
func libc_getsockname(fd int, sa *RawSockaddrAny, len *Socklen_t) int __asm__ ("getsockname");
func libc_getpeername(fd int, sa *RawSockaddrAny, len *Socklen_t) int __asm__ ("getpeername");
func libc_recv(fd int, buf *byte, len Size_t, flags int) Ssize_t __asm__ ("recv");
func libc_recvfrom(fd int, buf *byte, len Size_t, flags int,
from *RawSockaddrAny, fromlen *Socklen_t) Ssize_t __asm__("recvfrom");
func libc_send(fd int, buf *byte, len Size_t, flags int) Ssize_t __asm__("send");
func libc_sendto(fd int, buf *byte, len Size_t, flags int,
to *RawSockaddrAny, tolen Socklen_t) Ssize_t __asm__("sendto");
func libc_shutdown(fd int, how int) int __asm__ ("shutdown");
func Accept(fd int) (nfd int, sa Sockaddr, errno int) {
var rsa RawSockaddrAny;
var len Socklen_t = SizeofSockaddrAny;
nfd = libc_accept(fd, &rsa, &len);
if nfd < 0 {
errno = GetErrno();
return;
}
sa, errno = anyToSockaddr(&rsa);
if errno != 0 {
Close(nfd);
nfd = 0;
}
return;
}
func Bind(fd int, sa Sockaddr) (errno int) {
ptr, n, err := sa.sockaddr();
if err != 0 {
return err;
}
if libc_bind(fd, ptr, n) < 0 {
errno = GetErrno();
}
return;
}
func Connect(fd int, sa Sockaddr) (errno int) {
ptr, n, err := sa.sockaddr();
if err != 0 {
return err;
}
if libc_connect(fd, ptr, n) < 0 {
errno = GetErrno();
}
return;
}
func Socket(domain, typ, proto int) (fd, errno int) {
if domain == AF_INET6 && SocketDisableIPv6 {
return -1, EAFNOSUPPORT
}
fd = libc_socket(int(domain), int(typ), int(proto));
if fd < 0 {
errno = GetErrno();
}
return;
}
func Listen(fd int, n int) (errno int) {
r := libc_listen(int(fd), int(n));
if r < 0 { errno = GetErrno() }
return;
}
func setsockopt(fd, level, opt int, valueptr uintptr, length Socklen_t) (errno int) {
r := libc_setsockopt(fd, level, opt, (*byte)(unsafe.Pointer(valueptr)),
length);
if r < 0 { errno = GetErrno() }
return;
}
func SetsockoptInt(fd, level, opt int, value int) (errno int) {
var n = int32(value);
return setsockopt(fd, level, opt, uintptr(unsafe.Pointer(&n)), 4);
}
func SetsockoptTimeval(fd, level, opt int, tv *Timeval) (errno int) {
return setsockopt(fd, level, opt, uintptr(unsafe.Pointer(tv)), Socklen_t(unsafe.Sizeof(*tv)));
}
func SetsockoptLinger(fd, level, opt int, l *Linger) (errno int) {
return setsockopt(fd, level, opt, uintptr(unsafe.Pointer(l)), Socklen_t(unsafe.Sizeof(*l)));
}
func SetsockoptString(fd, level, opt int, s string) (errno int) {
return setsockopt(fd, level, opt, uintptr(unsafe.Pointer(&[]byte(s)[0])), Socklen_t(len(s)))
}
func Getsockname(fd int) (sa Sockaddr, errno int) {
var rsa RawSockaddrAny;
var len Socklen_t = SizeofSockaddrAny;
if libc_getsockname(fd, &rsa, &len) != 0 {
errno = GetErrno();
return;
}
return anyToSockaddr(&rsa);
}
func Getpeername(fd int) (sa Sockaddr, errno int) {
var rsa RawSockaddrAny;
var len Socklen_t = SizeofSockaddrAny;
if libc_getpeername(fd, &rsa, &len) != 0 {
errno = GetErrno();
return;
}
return anyToSockaddr(&rsa);
}
func Recvfrom(fd int, p []byte, flags int) (n int, from Sockaddr, errno int) {
var rsa RawSockaddrAny;
var slen Socklen_t = SizeofSockaddrAny;
var _p0 *byte;
if len(p) > 0 { _p0 = &p[0]; }
r := libc_recvfrom(fd, _p0, Size_t(len(p)), flags, &rsa, &slen);
n = int(r);
if r == -1 {
errno = GetErrno();
} else {
from, errno = anyToSockaddr(&rsa);
}
return;
}
func Sendto(fd int, p []byte, flags int, to Sockaddr) (errno int) {
ptr, n, err := to.sockaddr();
if err != 0 {
return err;
}
var _p0 *byte;
if len(p) > 0 { _p0 = &p[0]; }
r := libc_sendto(fd, _p0, Size_t(len(p)), flags, ptr, n);
if r == -1 { errno = GetErrno(); }
return;
}
func Shutdown(fd int, how int) (errno int) {
r := libc_shutdown(fd, how);
if r < 0 { errno = GetErrno() }
return;
}
// FIXME: No getsockopt.
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