runtime: extract canGenerateCore

Author: zzkcode

src/runtime/runtime-gdb_unix_test.go

@@ -20,6 +20,43 @@ import (
 	"testing"
 )
 
+func canGenerateCore(t *testing.T) bool {
+	// Ensure there is enough RLIMIT_CORE available to generate a full core.
+	var lim syscall.Rlimit
+	err := syscall.Getrlimit(syscall.RLIMIT_CORE, &lim)
+	if err != nil {
+		t.Fatalf("error getting rlimit: %v", err)
+	}
+	// Minimum RLIMIT_CORE max to allow. This is a conservative estimate.
+	// Most systems allow infinity.
+	const minRlimitCore = 100 << 20 // 100 MB
+	if lim.Max < minRlimitCore {
+		t.Skipf("RLIMIT_CORE max too low: %#+v", lim)
+	}
+
+	// Make sure core pattern will send core to the current directory.
+	b, err := os.ReadFile("/proc/sys/kernel/core_pattern")
+	if err != nil {
+		t.Fatalf("error reading core_pattern: %v", err)
+	}
+	if string(b) != "core\n" {
+		t.Skipf("Unexpected core pattern %q", string(b))
+	}
+
+	coreUsesPID := false
+	b, err = os.ReadFile("/proc/sys/kernel/core_uses_pid")
+	if err == nil {
+		switch string(bytes.TrimSpace(b)) {
+		case "0":
+		case "1":
+			coreUsesPID = true
+		default:
+			t.Skipf("unexpected core_uses_pid value %q", string(b))
+		}
+	}
+	return coreUsesPID
+}
+
 const coreSignalSource = `
 package main
 
@@ -81,45 +118,12 @@ func TestGdbCoreSignalBacktrace(t *testing.T) {
 	t.Parallel()
 	checkGdbVersion(t)
 
-	// Ensure there is enough RLIMIT_CORE available to generate a full core.
-	var lim syscall.Rlimit
-	err := syscall.Getrlimit(syscall.RLIMIT_CORE, &lim)
-	if err != nil {
-		t.Fatalf("error getting rlimit: %v", err)
-	}
-	// Minimum RLIMIT_CORE max to allow. This is a conservative estimate.
-	// Most systems allow infinity.
-	const minRlimitCore = 100 << 20 // 100 MB
-	if lim.Max < minRlimitCore {
-		t.Skipf("RLIMIT_CORE max too low: %#+v", lim)
-	}
-
-	// Make sure core pattern will send core to the current directory.
-	b, err := os.ReadFile("/proc/sys/kernel/core_pattern")
-	if err != nil {
-		t.Fatalf("error reading core_pattern: %v", err)
-	}
-	if string(b) != "core\n" {
-		t.Skipf("Unexpected core pattern %q", string(b))
-	}
-
-	coreUsesPID := false
-	b, err = os.ReadFile("/proc/sys/kernel/core_uses_pid")
-	if err == nil {
-		switch string(bytes.TrimSpace(b)) {
-		case "0":
-		case "1":
-			coreUsesPID = true
-		default:
-			t.Skipf("unexpected core_uses_pid value %q", string(b))
-		}
-	}
-
-	dir := t.TempDir()
+	coreUsesPID := canGenerateCore(t)
 
 	// Build the source code.
+	dir := t.TempDir()
 	src := filepath.Join(dir, "main.go")
-	err = os.WriteFile(src, []byte(coreSignalSource), 0644)
+	err := os.WriteFile(src, []byte(coreSignalSource), 0644)
 	if err != nil {
 		t.Fatalf("failed to create file: %v", err)
 	}
@@ -296,45 +300,12 @@ func TestGdbCoreCrashThreadBacktrace(t *testing.T) {
 	t.Parallel()
 	checkGdbVersion(t)
 
-	// Ensure there is enough RLIMIT_CORE available to generate a full core.
-	var lim syscall.Rlimit
-	err := syscall.Getrlimit(syscall.RLIMIT_CORE, &lim)
-	if err != nil {
-		t.Fatalf("error getting rlimit: %v", err)
-	}
-	// Minimum RLIMIT_CORE max to allow. This is a conservative estimate.
-	// Most systems allow infinity.
-	const minRlimitCore = 100 << 20 // 100 MB
-	if lim.Max < minRlimitCore {
-		t.Skipf("RLIMIT_CORE max too low: %#+v", lim)
-	}
-
-	// Make sure core pattern will send core to the current directory.
-	b, err := os.ReadFile("/proc/sys/kernel/core_pattern")
-	if err != nil {
-		t.Fatalf("error reading core_pattern: %v", err)
-	}
-	if string(b) != "core\n" {
-		t.Skipf("Unexpected core pattern %q", string(b))
-	}
-
-	coreUsesPID := false
-	b, err = os.ReadFile("/proc/sys/kernel/core_uses_pid")
-	if err == nil {
-		switch string(bytes.TrimSpace(b)) {
-		case "0":
-		case "1":
-			coreUsesPID = true
-		default:
-			t.Skipf("unexpected core_uses_pid value %q", string(b))
-		}
-	}
-
-	dir := t.TempDir()
+	coreUsesPID := canGenerateCore(t)
 
 	// Build the source code.
+	dir := t.TempDir()
 	src := filepath.Join(dir, "main.go")
-	err = os.WriteFile(src, []byte(coreCrashThreadSource), 0644)
+	err := os.WriteFile(src, []byte(coreCrashThreadSource), 0644)
 	if err != nil {
 		t.Fatalf("failed to create file: %v", err)
 	}