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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Test that a signal handler works in non-Go code when using
// os/signal.Notify.
// This is a lot like misc/cgo/testcarchive/main3.c.
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sched.h>
#include <dlfcn.h>
static void die(const char* msg) {
perror(msg);
exit(EXIT_FAILURE);
}
static volatile sig_atomic_t sigioSeen;
static void ioHandler(int signo, siginfo_t* info, void* ctxt) {
sigioSeen = 1;
}
int main(int argc, char** argv) {
int verbose;
struct sigaction sa;
void* handle;
void (*fn1)(void);
int (*sawSIGIO)(void);
int i;
struct timespec ts;
verbose = argc > 2;
setvbuf(stdout, NULL, _IONBF, 0);
if (verbose) {
printf("calling sigaction\n");
}
memset(&sa, 0, sizeof sa);
sa.sa_sigaction = ioHandler;
if (sigemptyset(&sa.sa_mask) < 0) {
die("sigemptyset");
}
sa.sa_flags = SA_SIGINFO;
if (sigaction(SIGIO, &sa, NULL) < 0) {
die("sigaction");
}
if (verbose) {
printf("calling dlopen\n");
}
handle = dlopen(argv[1], RTLD_NOW | RTLD_GLOBAL);
if (handle == NULL) {
fprintf(stderr, "%s\n", dlerror());
exit(EXIT_FAILURE);
}
// At this point there should not be a Go signal handler
// installed for SIGIO.
if (verbose) {
printf("raising SIGIO\n");
}
if (raise(SIGIO) < 0) {
die("raise");
}
if (verbose) {
printf("waiting for sigioSeen\n");
}
// Wait until the signal has been delivered.
i = 0;
while (!sigioSeen) {
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);
}
}
sigioSeen = 0;
// Tell the Go code to catch SIGIO.
if (verbose) {
printf("calling dlsym\n");
}
fn1 = (void(*)(void))dlsym(handle, "CatchSIGIO");
if (fn1 == NULL) {
fprintf(stderr, "%s\n", dlerror());
exit(EXIT_FAILURE);
}
if (verbose) {
printf("calling CatchSIGIO\n");
}
fn1();
if (verbose) {
printf("raising SIGIO\n");
}
if (raise(SIGIO) < 0) {
die("raise");
}
if (verbose) {
printf("calling dlsym\n");
}
// Check that the Go code saw SIGIO.
sawSIGIO = (int (*)(void))dlsym(handle, "SawSIGIO");
if (sawSIGIO == NULL) {
fprintf(stderr, "%s\n", dlerror());
exit(EXIT_FAILURE);
}
if (verbose) {
printf("calling SawSIGIO\n");
}
if (!sawSIGIO()) {
fprintf(stderr, "Go handler did not see SIGIO\n");
exit(EXIT_FAILURE);
}
if (sigioSeen != 0) {
fprintf(stderr, "C handler saw SIGIO when only Go handler should have\n");
exit(EXIT_FAILURE);
}
// Tell the Go code to stop catching SIGIO.
if (verbose) {
printf("calling dlsym\n");
}
fn1 = (void(*)(void))dlsym(handle, "ResetSIGIO");
if (fn1 == NULL) {
fprintf(stderr, "%s\n", dlerror());
exit(EXIT_FAILURE);
}
if (verbose) {
printf("calling ResetSIGIO\n");
}
fn1();
if (verbose) {
printf("raising SIGIO\n");
}
if (raise(SIGIO) < 0) {
die("raise");
}
if (verbose) {
printf("calling SawSIGIO\n");
}
if (sawSIGIO()) {
fprintf(stderr, "Go handler saw SIGIO after Reset\n");
exit(EXIT_FAILURE);
}
if (verbose) {
printf("waiting for sigioSeen\n");
}
// Wait until the signal has been delivered.
i = 0;
while (!sigioSeen) {
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);
}
}
printf("PASS\n");
return 0;
}
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