ts.tv_sec = 0;
		ts.tv_nsec = 1000000;
		nanosleep(&ts, NULL);
		i++;
		if (i > 5000) {
			fprintf(stderr, "looping too long waiting for signal\n");
			exit(EXIT_FAILURE);
		}
	}

	// We should still be on the same signal stack.
	if (sigaltstack(NULL, &nss) < 0) {
		die("sigaltstack check");
	}
	if ((nss.ss_flags & SS_DISABLE) != 0) {
		fprintf(stderr, "sigaltstack disabled on return from Go\n");

#include <assert.h>
#include "life.h"
#include "_cgo_export.h"

const int MYCONST = 0;

// Do the actual manipulation of the life board in C.  This could be
// done easily in Go, we are just using C for demonstration
// purposes.
void
Step(int x, int y, int *a, int *n)
{
	struct GoStart_return r;

	// Use Go to start 4 goroutines each of which handles 1/4 of the
	// board.

	int diff;

	gettimeofday(&tvstart, NULL);

	go_start_profile();

	// Busy wait so we have something to profile.
	// If we just sleep the profiling signal will never fire.
	while (1) {
		gettimeofday(&tvnow, NULL);
		diff = (tvnow.tv_sec - tvstart.tv_sec) * 1000 * 1000 + (tvnow.tv_usec - tvstart.tv_usec);

		// Profile frequency is 100Hz so we should definitely
		// get a signal in 50 milliseconds.
		if (diff > 50 * 1000)
			break;

#include <assert.h>
#include "life.h"
#include "_cgo_export.h"

const int MYCONST = 0;

// Do the actual manipulation of the life board in C.  This could be
// done easily in Go, we are just using C for demonstration
// purposes.
void
Step(int x, int y, int *a, int *n)
{
	struct GoStart_return r;

	// Use Go to start 4 goroutines each of which handles 1/4 of the
	// board.

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// It's going to be hard to include a whole real JVM to test this.
// So we'll simulate a really easy JVM using just the parts we need.

// This is the relevant part of jni.h.

// On Android NDK16, jobject is defined like this in C and C++
typedef void* jobject;

typedef jobject jclass;
typedef jobject jthrowable;
typedef jobject jstring;

	}
	i = sigprocmask(SIG_UNBLOCK, &mask, NULL);
	if (i != 0) {
		fprintf(stderr, "sigprocmask: %s\n", strerror(i));
		exit(EXIT_FAILURE);
	}

	// Don't try this at home.
	longjmp(jmp, signo);

	// We should never get here.
	abort();
}

// Set up the signal handlers in a high priority constructor,
// so that they are installed before the Go code starts.

static void init(void) __attribute__ ((constructor (200)));

			if (verbose) {
				printf("attempting external signal test\n");
			}

			fprintf(stderr, "OK\n");
			fflush(stderr);

			// The program should be interrupted before
			// this sleep finishes. We use select rather
			// than sleep because in older versions of
			// glibc the sleep function does some signal
			// fiddling to handle SIGCHLD.  If this
			// program is fiddling signals just when the

// license that can be found in the LICENSE file.

//go:build !windows && !static && !(darwin && internal)

#include <stdint.h>
#include <dlfcn.h>

// Write our own versions of dlopen/dlsym/dlclose so that we represent
// the opaque handle as a Go uintptr rather than a Go pointer to avoid
// garbage collector confusion.  See issue 23663.

uintptr_t dlopen4029(char* name, int flags) {
	return (uintptr_t)(dlopen(name, flags));
}

	}

	// Don't try this at home.
	longjmp(jmp, signo);

	// We should never get here.
	abort();
}

int main(int argc, char** argv) {
	int verbose;
	struct sigaction sa;
	void* handle;
	void (*fn)(void);
	sigset_t mask;
	int i;
	struct timespec ts;

	verbose = argc > 2;
	setvbuf(stdout, NULL, _IONBF, 0);

	// Call setsid so that we can use kill(0, SIGIO) below.

// Read a string from the file descriptor and print it.
int main(void) {
  int i;
  ssize_t n;
  char buf[20];
  struct timespec ts;

  // The descriptor will be initialized in a thread, so we have to
  // give a chance to get opened.
  for (i = 0; i < 200; i++) {
    n = read(fd, buf, sizeof buf);
    if (n >= 0)
      break;
    if (errno != EBADF && errno != EINVAL) {