unix: add Getmsg and Putmsg on illumos

Change-Id: Id1f2a2797e56a45584f70ee5e9202647a595a031
Reviewed-on: https://go-review.googlesource.com/c/sys/+/302830
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Trust: Ian Lance Taylor <iant@golang.org>

unix/syscall_illumos.go

@@ -9,7 +9,9 @@
 
 package unix
 
-import "unsafe"
+import (
+	"unsafe"
+)
 
 func bytes2iovec(bs [][]byte) []Iovec {
 	iovecs := make([]Iovec, len(bs))
@@ -76,3 +78,52 @@ func Accept4(fd int, flags int) (nfd int, sa Sockaddr, err error) {
 	}
 	return
 }
+
+//sys	putmsg(fd int, clptr *strbuf, dataptr *strbuf, flags int) (err error)
+
+func Putmsg(fd int, cl []byte, data []byte, flags int) (err error) {
+	var clp, datap *strbuf
+	if len(cl) > 0 {
+		clp = &strbuf{
+			Len: int32(len(cl)),
+			Buf: (*int8)(unsafe.Pointer(&cl[0])),
+		}
+	}
+	if len(data) > 0 {
+		datap = &strbuf{
+			Len: int32(len(data)),
+			Buf: (*int8)(unsafe.Pointer(&data[0])),
+		}
+	}
+	return putmsg(fd, clp, datap, flags)
+}
+
+//sys	getmsg(fd int, clptr *strbuf, dataptr *strbuf, flags *int) (err error)
+
+func Getmsg(fd int, cl []byte, data []byte) (retCl []byte, retData []byte, flags int, err error) {
+	var clp, datap *strbuf
+	if len(cl) > 0 {
+		clp = &strbuf{
+			Maxlen: int32(len(cl)),
+			Buf:    (*int8)(unsafe.Pointer(&cl[0])),
+		}
+	}
+	if len(data) > 0 {
+		datap = &strbuf{
+			Maxlen: int32(len(data)),
+			Buf:    (*int8)(unsafe.Pointer(&data[0])),
+		}
+	}
+
+	if err = getmsg(fd, clp, datap, &flags); err != nil {
+		return nil, nil, 0, err
+	}
+
+	if len(cl) > 0 {
+		retCl = cl[:clp.Len]
+	}
+	if len(data) > 0 {
+		retData = data[:datap.Len]
+	}
+	return retCl, retData, flags, nil
+}

unix/zsyscall_illumos_amd64.go

@@ -15,19 +15,25 @@ import (
 //go:cgo_import_dynamic libc_writev writev "libc.so"
 //go:cgo_import_dynamic libc_pwritev pwritev "libc.so"
 //go:cgo_import_dynamic libc_accept4 accept4 "libsocket.so"
+//go:cgo_import_dynamic libc_putmsg putmsg "libc.so"
+//go:cgo_import_dynamic libc_getmsg getmsg "libc.so"
 
 //go:linkname procreadv libc_readv
 //go:linkname procpreadv libc_preadv
 //go:linkname procwritev libc_writev
 //go:linkname procpwritev libc_pwritev
 //go:linkname procaccept4 libc_accept4
+//go:linkname procputmsg libc_putmsg
+//go:linkname procgetmsg libc_getmsg
 
 var (
 	procreadv,
 	procpreadv,
 	procwritev,
 	procpwritev,
-	procaccept4 syscallFunc
+	procaccept4,
+	procputmsg,
+	procgetmsg syscallFunc
 )
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
@@ -100,3 +106,23 @@ func accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int,
 	}
 	return
 }
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func putmsg(fd int, clptr *strbuf, dataptr *strbuf, flags int) (err error) {
+	_, _, e1 := sysvicall6(uintptr(unsafe.Pointer(&procputmsg)), 4, uintptr(fd), uintptr(unsafe.Pointer(clptr)), uintptr(unsafe.Pointer(dataptr)), uintptr(flags), 0, 0)
+	if e1 != 0 {
+		err = e1
+	}
+	return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
+func getmsg(fd int, clptr *strbuf, dataptr *strbuf, flags *int) (err error) {
+	_, _, e1 := sysvicall6(uintptr(unsafe.Pointer(&procgetmsg)), 4, uintptr(fd), uintptr(unsafe.Pointer(clptr)), uintptr(unsafe.Pointer(dataptr)), uintptr(unsafe.Pointer(flags)), 0, 0)
+	if e1 != 0 {
+		err = e1
+	}
+	return
+}