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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 os/signal.Notify and os/signal.Reset.
// This is a lot like misc/cgo/testcshared/main5.c.
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sched.h>
#include <unistd.h>
#include <pthread.h>
#include "libgo3.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;
}
// Set up the SIGPIPE signal handler in a high priority constructor, so
// that it is installed before the Go code starts.
static void pipeHandler(int signo, siginfo_t* info, void* ctxt) {
const char *s = "unexpected SIGPIPE\n";
write(2, s, strlen(s));
exit(EXIT_FAILURE);
}
static void init(void) __attribute__ ((constructor (200)));
static void init() {
struct sigaction sa;
memset(&sa, 0, sizeof sa);
sa.sa_sigaction = pipeHandler;
if (sigemptyset(&sa.sa_mask) < 0) {
die("sigemptyset");
}
sa.sa_flags = SA_SIGINFO;
if (sigaction(SIGPIPE, &sa, NULL) < 0) {
die("sigaction");
}
}
static void *provokeSIGPIPE(void *arg) {
ProvokeSIGPIPE();
return NULL;
}
int main(int argc, char** argv) {
int verbose;
struct sigaction sa;
int i;
struct timespec ts;
int res;
pthread_t tid;
verbose = argc > 2;
setvbuf(stdout, NULL, _IONBF, 0);
if (verbose) {
printf("raising SIGPIPE\n");
}
// Test that the Go runtime handles SIGPIPE, even if we installed
// a non-default SIGPIPE handler before the runtime initializes.
ProvokeSIGPIPE();
// Test that SIGPIPE on a non-main thread is also handled by Go.
res = pthread_create(&tid, NULL, provokeSIGPIPE, NULL);
if (res != 0) {
fprintf(stderr, "pthread_create: %s\n", strerror(res));
exit(EXIT_FAILURE);
}
res = pthread_join(tid, NULL);
if (res != 0) {
fprintf(stderr, "pthread_join: %s\n", strerror(res));
exit(EXIT_FAILURE);
}
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");
}
// 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 CatchSIGIO\n");
}
CatchSIGIO();
if (verbose) {
printf("raising SIGIO\n");
}
if (raise(SIGIO) < 0) {
die("raise");
}
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 ResetSIGIO\n");
}
ResetSIGIO();
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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