unix: add Uvmexp and SysctlUvmexp for NetBSD

NetBSD has both struct uvmexp (used internally) and struct uvmexp_sysctl
(preferred for interfacing from user code). Expose the latter as type
Uvmexp with the same interface as on OpenBSD.

I am not sure if it makes sense to even have a name parameter for
SysctlUvmexp, since the only valid value can be "vm.uvmext2".

Change-Id: I40a743536c28e3fb7a54253768db35b1629fabfe
Reviewed-on: https://go-review.googlesource.com/c/sys/+/460156
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Benny Siegert <bsiegert@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

unix/syscall_netbsd.go

@@ -110,6 +110,20 @@ func direntNamlen(buf []byte) (uint64, bool) {
 	return readInt(buf, unsafe.Offsetof(Dirent{}.Namlen), unsafe.Sizeof(Dirent{}.Namlen))
 }
 
+func SysctlUvmexp(name string) (*Uvmexp, error) {
+	mib, err := sysctlmib(name)
+	if err != nil {
+		return nil, err
+	}
+
+	n := uintptr(SizeofUvmexp)
+	var u Uvmexp
+	if err := sysctl(mib, (*byte)(unsafe.Pointer(&u)), &n, nil, 0); err != nil {
+		return nil, err
+	}
+	return &u, nil
+}
+
 func Pipe(p []int) (err error) {
 	return Pipe2(p, 0)
 }

unix/sysctl_netbsd_test.go

@@ -0,0 +1,15 @@
+// Copyright 2023 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.
+
+package unix
+
+import "testing"
+
+func TestSysctlUvmexp(t *testing.T) {
+	uvm, err := SysctlUvmexp("vm.uvmexp2")
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Logf("%#v", uvm)
+}

unix/types_netbsd.go

@@ -41,6 +41,7 @@ package unix
 #include <sys/un.h>
 #include <sys/utsname.h>
 #include <sys/wait.h>
+#include <uvm/uvm_extern.h>
 #include <net/bpf.h>
 #include <net/if.h>
 #include <net/if_dl.h>
@@ -297,6 +298,12 @@ type Sysctlnode C.struct_sysctlnode
 
 type Utsname C.struct_utsname
 
+// Uvmexp
+
+const SizeofUvmexp = C.sizeof_struct_uvmexp_sysctl
+
+type Uvmexp C.struct_uvmexp_sysctl
+
 // Clockinfo
 
 const SizeofClockinfo = C.sizeof_struct_clockinfo

unix/ztypes_netbsd_386.go

@@ -491,6 +491,90 @@ type Utsname struct {
 	Machine  [256]byte
 }
 
+const SizeofUvmexp = 0x278
+
+type Uvmexp struct {
+	Pagesize           int64
+	Pagemask           int64
+	Pageshift          int64
+	Npages             int64
+	Free               int64
+	Active             int64
+	Inactive           int64
+	Paging             int64
+	Wired              int64
+	Zeropages          int64
+	Reserve_pagedaemon int64
+	Reserve_kernel     int64
+	Freemin            int64
+	Freetarg           int64
+	Inactarg           int64
+	Wiredmax           int64
+	Nswapdev           int64
+	Swpages            int64
+	Swpginuse          int64
+	Swpgonly           int64
+	Nswget             int64
+	Unused1            int64
+	Cpuhit             int64
+	Cpumiss            int64
+	Faults             int64
+	Traps              int64
+	Intrs              int64
+	Swtch              int64
+	Softs              int64
+	Syscalls           int64
+	Pageins            int64
+	Swapins            int64
+	Swapouts           int64
+	Pgswapin           int64
+	Pgswapout          int64
+	Forks              int64
+	Forks_ppwait       int64
+	Forks_sharevm      int64
+	Pga_zerohit        int64
+	Pga_zeromiss       int64
+	Zeroaborts         int64
+	Fltnoram           int64
+	Fltnoanon          int64
+	Fltpgwait          int64
+	Fltpgrele          int64
+	Fltrelck           int64
+	Fltrelckok         int64
+	Fltanget           int64
+	Fltanretry         int64
+	Fltamcopy          int64
+	Fltnamap           int64
+	Fltnomap           int64
+	Fltlget            int64
+	Fltget             int64
+	Flt_anon           int64
+	Flt_acow           int64
+	Flt_obj            int64
+	Flt_prcopy         int64
+	Flt_przero         int64
+	Pdwoke             int64
+	Pdrevs             int64
+	Unused4            int64
+	Pdfreed            int64
+	Pdscans            int64
+	Pdanscan           int64
+	Pdobscan           int64
+	Pdreact            int64
+	Pdbusy             int64
+	Pdpageouts         int64
+	Pdpending          int64
+	Pddeact            int64
+	Anonpages          int64
+	Filepages          int64
+	Execpages          int64
+	Colorhit           int64
+	Colormiss          int64
+	Ncolors            int64
+	Bootpages          int64
+	Poolpages          int64
+}
+
 const SizeofClockinfo = 0x14
 
 type Clockinfo struct {

unix/ztypes_netbsd_amd64.go

@@ -499,6 +499,90 @@ type Utsname struct {
 	Machine  [256]byte
 }
 
+const SizeofUvmexp = 0x278
+
+type Uvmexp struct {
+	Pagesize           int64
+	Pagemask           int64
+	Pageshift          int64
+	Npages             int64
+	Free               int64
+	Active             int64
+	Inactive           int64
+	Paging             int64
+	Wired              int64
+	Zeropages          int64
+	Reserve_pagedaemon int64
+	Reserve_kernel     int64
+	Freemin            int64
+	Freetarg           int64
+	Inactarg           int64
+	Wiredmax           int64
+	Nswapdev           int64
+	Swpages            int64
+	Swpginuse          int64
+	Swpgonly           int64
+	Nswget             int64
+	Unused1            int64
+	Cpuhit             int64
+	Cpumiss            int64
+	Faults             int64
+	Traps              int64
+	Intrs              int64
+	Swtch              int64
+	Softs              int64
+	Syscalls           int64
+	Pageins            int64
+	Swapins            int64
+	Swapouts           int64
+	Pgswapin           int64
+	Pgswapout          int64
+	Forks              int64
+	Forks_ppwait       int64
+	Forks_sharevm      int64
+	Pga_zerohit        int64
+	Pga_zeromiss       int64
+	Zeroaborts         int64
+	Fltnoram           int64
+	Fltnoanon          int64
+	Fltpgwait          int64
+	Fltpgrele          int64
+	Fltrelck           int64
+	Fltrelckok         int64
+	Fltanget           int64
+	Fltanretry         int64
+	Fltamcopy          int64
+	Fltnamap           int64
+	Fltnomap           int64
+	Fltlget            int64
+	Fltget             int64
+	Flt_anon           int64
+	Flt_acow           int64
+	Flt_obj            int64
+	Flt_prcopy         int64
+	Flt_przero         int64
+	Pdwoke             int64
+	Pdrevs             int64
+	Unused4            int64
+	Pdfreed            int64
+	Pdscans            int64
+	Pdanscan           int64
+	Pdobscan           int64
+	Pdreact            int64
+	Pdbusy             int64
+	Pdpageouts         int64
+	Pdpending          int64
+	Pddeact            int64
+	Anonpages          int64
+	Filepages          int64
+	Execpages          int64
+	Colorhit           int64
+	Colormiss          int64
+	Ncolors            int64
+	Bootpages          int64
+	Poolpages          int64
+}
+
 const SizeofClockinfo = 0x14
 
 type Clockinfo struct {

unix/ztypes_netbsd_arm.go

@@ -496,6 +496,90 @@ type Utsname struct {
 	Machine  [256]byte
 }
 
+const SizeofUvmexp = 0x278
+
+type Uvmexp struct {
+	Pagesize           int64
+	Pagemask           int64
+	Pageshift          int64
+	Npages             int64
+	Free               int64
+	Active             int64
+	Inactive           int64
+	Paging             int64
+	Wired              int64
+	Zeropages          int64
+	Reserve_pagedaemon int64
+	Reserve_kernel     int64
+	Freemin            int64
+	Freetarg           int64
+	Inactarg           int64
+	Wiredmax           int64
+	Nswapdev           int64
+	Swpages            int64
+	Swpginuse          int64
+	Swpgonly           int64
+	Nswget             int64
+	Unused1            int64
+	Cpuhit             int64
+	Cpumiss            int64
+	Faults             int64
+	Traps              int64
+	Intrs              int64
+	Swtch              int64
+	Softs              int64
+	Syscalls           int64
+	Pageins            int64
+	Swapins            int64
+	Swapouts           int64
+	Pgswapin           int64
+	Pgswapout          int64
+	Forks              int64
+	Forks_ppwait       int64
+	Forks_sharevm      int64
+	Pga_zerohit        int64
+	Pga_zeromiss       int64
+	Zeroaborts         int64
+	Fltnoram           int64
+	Fltnoanon          int64
+	Fltpgwait          int64
+	Fltpgrele          int64
+	Fltrelck           int64
+	Fltrelckok         int64
+	Fltanget           int64
+	Fltanretry         int64
+	Fltamcopy          int64
+	Fltnamap           int64
+	Fltnomap           int64
+	Fltlget            int64
+	Fltget             int64
+	Flt_anon           int64
+	Flt_acow           int64
+	Flt_obj            int64
+	Flt_prcopy         int64
+	Flt_przero         int64
+	Pdwoke             int64
+	Pdrevs             int64
+	Unused4            int64
+	Pdfreed            int64
+	Pdscans            int64
+	Pdanscan           int64
+	Pdobscan           int64
+	Pdreact            int64
+	Pdbusy             int64
+	Pdpageouts         int64
+	Pdpending          int64
+	Pddeact            int64
+	Anonpages          int64
+	Filepages          int64
+	Execpages          int64
+	Colorhit           int64
+	Colormiss          int64
+	Ncolors            int64
+	Bootpages          int64
+	Poolpages          int64
+}
+
 const SizeofClockinfo = 0x14
 
 type Clockinfo struct {

unix/ztypes_netbsd_arm64.go

@@ -499,6 +499,90 @@ type Utsname struct {
 	Machine  [256]byte
 }
 
+const SizeofUvmexp = 0x278
+
+type Uvmexp struct {
+	Pagesize           int64
+	Pagemask           int64
+	Pageshift          int64
+	Npages             int64
+	Free               int64
+	Active             int64
+	Inactive           int64
+	Paging             int64
+	Wired              int64
+	Zeropages          int64
+	Reserve_pagedaemon int64
+	Reserve_kernel     int64
+	Freemin            int64
+	Freetarg           int64
+	Inactarg           int64
+	Wiredmax           int64
+	Nswapdev           int64
+	Swpages            int64
+	Swpginuse          int64
+	Swpgonly           int64
+	Nswget             int64
+	Unused1            int64
+	Cpuhit             int64
+	Cpumiss            int64
+	Faults             int64
+	Traps              int64
+	Intrs              int64
+	Swtch              int64
+	Softs              int64
+	Syscalls           int64
+	Pageins            int64
+	Swapins            int64
+	Swapouts           int64
+	Pgswapin           int64
+	Pgswapout          int64
+	Forks              int64
+	Forks_ppwait       int64
+	Forks_sharevm      int64
+	Pga_zerohit        int64
+	Pga_zeromiss       int64
+	Zeroaborts         int64
+	Fltnoram           int64
+	Fltnoanon          int64
+	Fltpgwait          int64
+	Fltpgrele          int64
+	Fltrelck           int64
+	Fltrelckok         int64
+	Fltanget           int64
+	Fltanretry         int64
+	Fltamcopy          int64
+	Fltnamap           int64
+	Fltnomap           int64
+	Fltlget            int64
+	Fltget             int64
+	Flt_anon           int64
+	Flt_acow           int64
+	Flt_obj            int64
+	Flt_prcopy         int64
+	Flt_przero         int64
+	Pdwoke             int64
+	Pdrevs             int64
+	Unused4            int64
+	Pdfreed            int64
+	Pdscans            int64
+	Pdanscan           int64
+	Pdobscan           int64
+	Pdreact            int64
+	Pdbusy             int64
+	Pdpageouts         int64
+	Pdpending          int64
+	Pddeact            int64
+	Anonpages          int64
+	Filepages          int64
+	Execpages          int64
+	Colorhit           int64
+	Colormiss          int64
+	Ncolors            int64
+	Bootpages          int64
+	Poolpages          int64
+}
+
 const SizeofClockinfo = 0x14
 
 type Clockinfo struct {