Implement new syscall package.

Calls to library functions now use entersyscall and
exitsyscall as appropriate.  This is a first step toward
multiplexing goroutines onto threads.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@180345 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 78 insertions, 0 deletions

diff --git a/libgo/go/syscall/lsf_linux.go b/libgo/go/syscall/lsf_linux.go
new file mode 100644
index 00000000000..f2bd2b757f9
--- /dev/null
+++ b/libgo/go/syscall/lsf_linux.go
@@ -0,0 +1,78 @@
+// 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.
+
+// Linux socket filter
+
+package syscall
+
+import (
+	"unsafe"
+)
+
+func LsfStmt(code, k int) *SockFilter {
+	return &SockFilter{Code: uint16(code), K: uint32(k)}
+}
+
+func LsfJump(code, k, jt, jf int) *SockFilter {
+	return &SockFilter{Code: uint16(code), Jt: uint8(jt), Jf: uint8(jf), K: uint32(k)}
+}
+
+func LsfSocket(ifindex, proto int) (int, int) {
+	var lsall SockaddrLinklayer
+	s, e := Socket(AF_PACKET, SOCK_RAW, proto)
+	if e != 0 {
+		return 0, e
+	}
+	p := (*[2]byte)(unsafe.Pointer(&lsall.Protocol))
+	p[0] = byte(proto >> 8)
+	p[1] = byte(proto)
+	lsall.Ifindex = ifindex
+	e = Bind(s, &lsall)
+	if e != 0 {
+		Close(s)
+		return 0, e
+	}
+	return s, 0
+}
+
+type iflags struct {
+	name  [IFNAMSIZ]byte
+	flags uint16
+}
+
+func SetLsfPromisc(name string, m bool) int {
+	s, e := Socket(AF_INET, SOCK_DGRAM, 0)
+	if e != 0 {
+		return e
+	}
+	defer Close(s)
+	var ifl iflags
+	copy(ifl.name[:], []byte(name))
+	_, _, ep := Syscall(SYS_IOCTL, uintptr(s), SIOCGIFFLAGS, uintptr(unsafe.Pointer(&ifl)))
+	if e := int(ep); e != 0 {
+		return e
+	}
+	if m {
+		ifl.flags |= uint16(IFF_PROMISC)
+	} else {
+		ifl.flags &= ^uint16(IFF_PROMISC)
+	}
+	_, _, ep = Syscall(SYS_IOCTL, uintptr(s), SIOCSIFFLAGS, uintptr(unsafe.Pointer(&ifl)))
+	if e := int(ep); e != 0 {
+		return e
+	}
+	return 0
+}
+
+func AttachLsf(fd int, i []SockFilter) int {
+	var p SockFprog
+	p.Len = uint16(len(i))
+	p.Filter = (*SockFilter)(unsafe.Pointer(&i[0]))
+	return setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, uintptr(unsafe.Pointer(&p)), unsafe.Sizeof(p))
+}
+
+func DetachLsf(fd int) int {
+	var dummy int
+	return setsockopt(fd, SOL_SOCKET, SO_DETACH_FILTER, uintptr(unsafe.Pointer(&dummy)), unsafe.Sizeof(dummy))
+}