Support syscall

pkg/plugins/fixtures/src/testpluginsyscall/go.mod

@@ -0,0 +1,3 @@
+module testpluginsyscall
+
+go 1.23.0 

pkg/plugins/fixtures/src/testpluginsyscall/testpluginsyscall.go

@@ -0,0 +1,29 @@
+package testpluginsyscall
+
+import (
+	"context"
+	"net/http"
+	"syscall"
+	"unsafe"
+)
+
+type Config struct {
+	Message string
+}
+
+func CreateConfig() *Config {
+	return &Config{Message: "syscall plugin"}
+}
+
+func New(ctx context.Context, next http.Handler, config *Config, name string) (http.Handler, error) {
+	// Use syscall and unsafe to test they're available
+	pid := syscall.Getpid()
+	size := unsafe.Sizeof(int(0))
+
+	return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
+		rw.Header().Set("X-Test-Plugin", "syscall")
+		rw.Header().Set("X-Test-PID", string(rune(pid)))
+		rw.Header().Set("X-Test-Size", string(rune(size)))
+		next.ServeHTTP(rw, req)
+	}), nil
+}