Make use of the new AllowPrctlSetName convenience function.

PiperOrigin-RevId: 436727461
Change-Id: Iab1945c422b8db98a220cdeacdec7c9868ea9e84

sandboxed_api/sandbox2/examples/static/static_bin.cc

@@ -18,6 +18,7 @@
 // It inverts all bytes coming from stdin and writes them to the stdout.
 
 #include <signal.h>
+#include <sys/prctl.h>
 #include <unistd.h>
 
 #include <cctype>
@@ -28,6 +29,8 @@ int main(int argc, char** argv) {
   char buf[1024];
   size_t total_bytes = 0U;
 
+  prctl(PR_SET_NAME, "static_bin");
+
   fprintf(stderr, "=============================\n");
   fprintf(stderr, "Starting file capitalization\n");
   fprintf(stderr, "=============================\n");

sandboxed_api/sandbox2/examples/static/static_sandbox.cc

@@ -69,6 +69,10 @@ std::unique_ptr<sandbox2::Policy> GetPolicy() {
       // write() calls with fd not in (1, 2) will continue evaluating the
       // policy. This means that other rules might still allow them.
 
+      // Allow the Sandboxee to set the name for better recognition in the
+      // process listing.
+      .AllowPrctlSetName()
+
       // Allow the dynamic loader to mark pages to never allow read-write-exec.
       .AddPolicyOnSyscall(__NR_mprotect,
                           {