instead of MADV_DONTNEED on Linux when returning memory to the
	kernel. This is more efficient, but means RSS numbers will
	drop only when the OS is under memory pressure. On the BSDs and
	Illumos/Solaris, setting madvdontneed=1 will use MADV_DONTNEED instead
	of MADV_FREE. This is less efficient, but causes RSS numbers to drop
	more quickly.

func poll_runtime_pollWait(pd *pollDesc, mode int) int {
	errcode := netpollcheckerr(pd, int32(mode))
	if errcode != pollNoError {
		return errcode
	}
	// As for now only Solaris, illumos, AIX and wasip1 use level-triggered IO.
	if GOOS == "solaris" || GOOS == "illumos" || GOOS == "aix" || GOOS == "wasip1" {
		netpollarm(pd, mode)
	}
	for !netpollblock(pd, int32(mode), false) {
		errcode = netpollcheckerr(pd, int32(mode))

	sfile := a.Objdir + "_buildid.s"

	var buf bytes.Buffer
	if cfg.Goos == "aix" {
		fmt.Fprintf(&buf, "\t.csect .go.buildid[XO]\n")
	} else if (cfg.Goos != "solaris" && cfg.Goos != "illumos") || assemblerIsGas() {
		fmt.Fprintf(&buf, "\t"+`.section .go.buildid,"e"`+"\n")
	} else if cfg.Goarch == "sparc" || cfg.Goarch == "sparc64" {
		fmt.Fprintf(&buf, "\t"+`.section ".go.buildid",#exclude`+"\n")

	// sources for "hosts", assume Go's DNS will work fine.
	if errors.Is(nss.err, fs.ErrNotExist) || (nss.err == nil && len(srcs) == 0) {
		if canUseCgo && c.goos == "solaris" {
			// illumos defaults to
			// "nis [NOTFOUND=return] files",
			// which the go resolver doesn't support.
			return hostLookupCgo, dnsConf
		}

		return hostLookupFilesDNS, dnsConf
	}
	if nss.err != nil {

those terms (in addition to any explicit constraints in the file).

Using GOOS=android matches build tags and files as for GOOS=linux
in addition to android tags and files.

Using GOOS=illumos matches build tags and files as for GOOS=solaris
in addition to illumos tags and files.

Using GOOS=ios matches build tags and files as for GOOS=darwin
in addition to ios tags and files.

The defined architecture feature build tags are:

		defer cancel()
	}

	c = exec.CommandContext(ctx, exe)
	var stdout, stderr strings.Builder
	c.Stdout = &stdout
	c.Stderr = &stderr
	c.ExtraFiles = []*os.File{tf}
	if runtime.GOOS == "illumos" {
		// Some facilities in illumos are implemented via access
		// to /proc by libc; such accesses can briefly occupy a
		// low-numbered fd.  If this occurs concurrently with the
		// test that checks for leaked descriptors, the check can

//
// Do not remove or change the type signature.
// See go.dev/issue/67401.
//
//go:linkname cgocall
//go:nosplit
func cgocall(fn, arg unsafe.Pointer) int32 {
	if !iscgo && GOOS != "solaris" && GOOS != "illumos" && GOOS != "windows" {
		throw("cgocall unavailable")
	}

	if fn == nil {
		throw("cgocall nil")
	}

	if raceenabled {
		racereleasemerge(unsafe.Pointer(&racecgosync))
	}

		}
	}
}

func TestTimePprof(t *testing.T) {
	// This test is unreliable on any system in which nanotime
	// calls into libc.
	switch runtime.GOOS {
	case "aix", "darwin", "illumos", "openbsd", "solaris":
		t.Skipf("skipping on %s because nanotime calls libc", runtime.GOOS)
	}

	// Pass GOTRACEBACK for issue #41120 to try to get more
	// information on timeout.