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Name	Size	Permission
libgo	[ DIR ]	drwxr-xr-x
libgo2	[ DIR ]	drwxr-xr-x
libgo3	[ DIR ]	drwxr-xr-x
libgo4	[ DIR ]	drwxr-xr-x
libgo6	[ DIR ]	drwxr-xr-x
libgo7	[ DIR ]	drwxr-xr-x
p	[ DIR ]	drwxr-xr-x
main.c	847 B	-rw-r--r--
main2.c	4.7 KB	-rw-r--r--
main3.c	3.93 KB	-rw-r--r--
main4.c	4.48 KB	-rw-r--r--
main5.c	1.9 KB	-rw-r--r--
main6.c	830 B	-rw-r--r--
main7.c	332 B	-rw-r--r--
main_unix.c	1.38 KB	-rw-r--r--
main_windows.c	343 B	-rw-r--r--

Code Editor : main2.c

// 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 installing a signal handler before the Go code starts.
// This is a lot like misc/cgo/testcshared/main4.c.

#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <sched.h>
#include <time.h>
#include <errno.h>

#include "libgo2.h"

static void die(const char* msg) {
	perror(msg);
	exit(EXIT_FAILURE);
}

static volatile sig_atomic_t sigioSeen;
static volatile sig_atomic_t sigpipeSeen;

// Use up some stack space.
static void recur(int i, char *p) {
	char a[1024];

*p = '\0';
	if (i > 0) {
		recur(i - 1, a);
	}
}

static void pipeHandler(int signo, siginfo_t* info, void* ctxt) {
	sigpipeSeen = 1;
}

// Signal handler that uses up more stack space than a goroutine will have.
static void ioHandler(int signo, siginfo_t* info, void* ctxt) {
	char a[1024];

recur(4, a);
	sigioSeen = 1;
}

static jmp_buf jmp;
static char* nullPointer;

// An arbitrary function which requires proper stack alignment; see
// http://golang.org/issue/17641.
static void callWithVarargs(void* dummy, ...) {
	va_list args;
	va_start(args, dummy);
	va_end(args);
}

// Signal handler for SIGSEGV on a C thread.
static void segvHandler(int signo, siginfo_t* info, void* ctxt) {
	sigset_t mask;
	int i;

// Call an arbitrary function that requires the stack to be properly aligned.
	callWithVarargs("dummy arg", 3.1415);

if (sigemptyset(&mask) < 0) {
		die("sigemptyset");
	}
	if (sigaddset(&mask, SIGSEGV) < 0) {
		die("sigaddset");
	}
	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)));

static void init() {
	struct sigaction sa;

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");
	}

sa.sa_sigaction = segvHandler;
	if (sigaction(SIGSEGV, &sa, NULL) < 0 || sigaction(SIGBUS, &sa, NULL) < 0) {
		die("sigaction");
	}

sa.sa_sigaction = pipeHandler;
	if (sigaction(SIGPIPE, &sa, NULL) < 0) {
		die("sigaction");
	}
}

int main(int argc, char** argv) {
	int verbose;
	sigset_t mask;
	int i;
	struct timespec ts;
	int darwin;

darwin = atoi(argv[1]);

verbose = argc > 2;

setvbuf(stdout, NULL, _IONBF, 0);

// Call setsid so that we can use kill(0, SIGIO) below.
	// Don't check the return value so that this works both from
	// a job control shell and from a shell script.
	setsid();

if (verbose) {
		printf("calling RunGoroutines\n");
	}

RunGoroutines();

// Block SIGIO in this thread to make it more likely that it
	// will be delivered to a goroutine.

if (verbose) {
		printf("calling pthread_sigmask\n");
	}

if (sigemptyset(&mask) < 0) {
		die("sigemptyset");
	}
	if (sigaddset(&mask, SIGIO) < 0) {
		die("sigaddset");
	}
	i = pthread_sigmask(SIG_BLOCK, &mask, NULL);
	if (i != 0) {
		fprintf(stderr, "pthread_sigmask: %s\n", strerror(i));
		exit(EXIT_FAILURE);
	}

if (verbose) {
		printf("calling kill\n");
	}

if (kill(0, SIGIO) < 0) {
		die("kill");
	}

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 SIGIO\n");
			exit(EXIT_FAILURE);
		}
	}

if (verbose) {
		printf("provoking SIGPIPE\n");
	}

// SIGPIPE is never forwarded on Darwin, see golang.org/issue/33384.
	if (!darwin) {
		GoRaiseSIGPIPE();

if (verbose) {
			printf("waiting for sigpipeSeen\n");
		}

// Wait until the signal has been delivered.
		i = 0;
		while (!sigpipeSeen) {
			ts.tv_sec = 0;
			ts.tv_nsec = 1000000;
			nanosleep(&ts, NULL);
			i++;
			if (i > 5000) {
				fprintf(stderr, "looping too long waiting for SIGPIPE\n");
				exit(EXIT_FAILURE);
			}
		}
	}

if (verbose) {
		printf("calling setjmp\n");
	}

// Test that a SIGSEGV on this thread is delivered to us.
	if (setjmp(jmp) == 0) {
		if (verbose) {
			printf("triggering SIGSEGV\n");
		}

*nullPointer = '\0';

fprintf(stderr, "continued after address error\n");
		exit(EXIT_FAILURE);
	}

if (verbose) {
		printf("calling TestSEGV\n");
	}

TestSEGV();

printf("PASS\n");
	return 0;
}

${this.title}

Code Editor : main2.c