unix: implement Gethostname, Pipe, and Wait4 for Solaris

Fixes golang/go#17107

Change-Id: Ibc18c6595ab6482a2feacaf51b93516fbc7cb2d6
Reviewed-on: https://go-review.googlesource.com/29166
Run-TryBot: Shawn Walker-Salas <shawn.walker@oracle.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

unix/syscall_solaris.go

@@ -72,18 +72,20 @@ func ParseDirent(buf []byte, max int, names []string) (consumed int, count int,
 	return origlen - len(buf), count, names
 }
 
-func pipe() (r uintptr, w uintptr, err uintptr)
+//sysnb	pipe(p *[2]_C_int) (n int, err error)
 
 func Pipe(p []int) (err error) {
 	if len(p) != 2 {
 		return EINVAL
 	}
-	r0, w0, e1 := pipe()
-	if e1 != 0 {
-		err = syscall.Errno(e1)
+	var pp [2]_C_int
+	n, err := pipe(&pp)
+	if n != 0 {
+		return err
 	}
-	p[0], p[1] = int(r0), int(w0)
-	return
+	p[0] = int(pp[0])
+	p[1] = int(pp[1])
+	return nil
 }
 
 func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, _Socklen, error) {
@@ -269,24 +271,34 @@ func (w WaitStatus) StopSignal() syscall.Signal {
 
 func (w WaitStatus) TrapCause() int { return -1 }
 
-func wait4(pid uintptr, wstatus *WaitStatus, options uintptr, rusage *Rusage) (wpid uintptr, err uintptr)
+//sys	wait4(pid int32, statusp *_C_int, options int, rusage *Rusage) (wpid int32, err error)
 
-func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, err error) {
-	r0, e1 := wait4(uintptr(pid), wstatus, uintptr(options), rusage)
-	if e1 != 0 {
-		err = syscall.Errno(e1)
+func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (int, error) {
+	var status _C_int
+	rpid, err := wait4(int32(pid), &status, options, rusage)
+	wpid := int(rpid)
+	if wpid == -1 {
+		return wpid, err
+	}
+	if wstatus != nil {
+		*wstatus = WaitStatus(status)
 	}
-	return int(r0), err
+	return wpid, nil
 }
 
-func gethostname() (name string, err uintptr)
+//sys	gethostname(buf []byte) (n int, err error)
 
 func Gethostname() (name string, err error) {
-	name, e1 := gethostname()
-	if e1 != 0 {
-		err = syscall.Errno(e1)
+	var buf [MaxHostNameLen]byte
+	n, err := gethostname(buf[:])
+	if n != 0 {
+		return "", err
 	}
-	return name, err
+	n = clen(buf[:])
+	if n < 1 {
+		return "", EFAULT
+	}
+	return string(buf[:n]), nil
 }
 
 //sys	utimes(path string, times *[2]Timeval) (err error)

unix/types_solaris.go

@@ -22,6 +22,7 @@ package unix
 #define __USE_LEGACY_PROTOTYPES__      // iovec
 #include <dirent.h>
 #include <fcntl.h>
+#include <netdb.h>
 #include <limits.h>
 #include <signal.h>
 #include <termios.h>
@@ -81,6 +82,7 @@ const (
 	sizeofLong     = C.sizeof_long
 	sizeofLongLong = C.sizeof_longlong
 	PathMax        = C.PATH_MAX
+	MaxHostNameLen = C.MAXHOSTNAMELEN
 )
 
 // Basic types

unix/zsyscall_solaris_amd64.go

@@ -10,10 +10,13 @@ import (
 	"unsafe"
 )
 
+//go:cgo_import_dynamic libc_pipe pipe "libc.so"
 //go:cgo_import_dynamic libc_getsockname getsockname "libsocket.so"
 //go:cgo_import_dynamic libc_getcwd getcwd "libc.so"
 //go:cgo_import_dynamic libc_getgroups getgroups "libc.so"
 //go:cgo_import_dynamic libc_setgroups setgroups "libc.so"
+//go:cgo_import_dynamic libc_wait4 wait4 "libc.so"
+//go:cgo_import_dynamic libc_gethostname gethostname "libc.so"
 //go:cgo_import_dynamic libc_utimes utimes "libc.so"
 //go:cgo_import_dynamic libc_utimensat utimensat "libc.so"
 //go:cgo_import_dynamic libc_fcntl fcntl "libc.so"
@@ -125,10 +128,13 @@ import (
 //go:cgo_import_dynamic libc_recvfrom recvfrom "libsocket.so"
 //go:cgo_import_dynamic libc_sysconf sysconf "libc.so"
 
+//go:linkname procpipe libc_pipe
 //go:linkname procgetsockname libc_getsockname
 //go:linkname procGetcwd libc_getcwd
 //go:linkname procgetgroups libc_getgroups
 //go:linkname procsetgroups libc_setgroups
+//go:linkname procwait4 libc_wait4
+//go:linkname procgethostname libc_gethostname
 //go:linkname procutimes libc_utimes
 //go:linkname procutimensat libc_utimensat
 //go:linkname procfcntl libc_fcntl
@@ -241,10 +247,13 @@ import (
 //go:linkname procsysconf libc_sysconf
 
 var (
+	procpipe,
 	procgetsockname,
 	procGetcwd,
 	procgetgroups,
 	procsetgroups,
+	procwait4,
+	procgethostname,
 	procutimes,
 	procutimensat,
 	procfcntl,
@@ -357,6 +366,15 @@ var (
 	procsysconf syscallFunc
 )
 
+func pipe(p *[2]_C_int) (n int, err error) {
+	r0, _, e1 := rawSysvicall6(uintptr(unsafe.Pointer(&procpipe)), 1, uintptr(unsafe.Pointer(p)), 0, 0, 0, 0, 0)
+	n = int(r0)
+	if e1 != 0 {
+		err = e1
+	}
+	return
+}
+
 func getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) {
 	_, _, e1 := sysvicall6(uintptr(unsafe.Pointer(&procgetsockname)), 3, uintptr(fd), uintptr(unsafe.Pointer(rsa)), uintptr(unsafe.Pointer(addrlen)), 0, 0, 0)
 	if e1 != 0 {
@@ -395,6 +413,28 @@ func setgroups(ngid int, gid *_Gid_t) (err error) {
 	return
 }
 
+func wait4(pid int32, statusp *_C_int, options int, rusage *Rusage) (wpid int32, err error) {
+	r0, _, e1 := sysvicall6(uintptr(unsafe.Pointer(&procwait4)), 4, uintptr(pid), uintptr(unsafe.Pointer(statusp)), uintptr(options), uintptr(unsafe.Pointer(rusage)), 0, 0)
+	wpid = int32(r0)
+	if e1 != 0 {
+		err = e1
+	}
+	return
+}
+
+func gethostname(buf []byte) (n int, err error) {
+	var _p0 *byte
+	if len(buf) > 0 {
+		_p0 = &buf[0]
+	}
+	r0, _, e1 := sysvicall6(uintptr(unsafe.Pointer(&procgethostname)), 2, uintptr(unsafe.Pointer(_p0)), uintptr(len(buf)), 0, 0, 0, 0)
+	n = int(r0)
+	if e1 != 0 {
+		err = e1
+	}
+	return
+}
+
 func utimes(path string, times *[2]Timeval) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)

unix/ztypes_solaris_amd64.go

@@ -1,6 +1,6 @@
 // +build amd64,solaris
 // Created by cgo -godefs - DO NOT EDIT
-// cgo -godefs types_solaris.go
+// cgo -godefs types_solaris.go | go run mkpost.go
 
 package unix
 
@@ -11,6 +11,7 @@ const (
 	sizeofLong     = 0x8
 	sizeofLongLong = 0x8
 	PathMax        = 0x400
+	MaxHostNameLen = 0x100
 )
 
 type (