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240 lines
4.7 KiB
240 lines
4.7 KiB
4 months ago
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// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test installing a signal handler before the Go code starts.
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// This is a lot like misc/cgo/testcshared/main4.c.
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#include <setjmp.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <sched.h>
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#include <time.h>
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#include <errno.h>
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#include "libgo2.h"
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static void die(const char* msg) {
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perror(msg);
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exit(EXIT_FAILURE);
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}
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static volatile sig_atomic_t sigioSeen;
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static volatile sig_atomic_t sigpipeSeen;
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// Use up some stack space.
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static void recur(int i, char *p) {
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char a[1024];
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*p = '\0';
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if (i > 0) {
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recur(i - 1, a);
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}
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}
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static void pipeHandler(int signo, siginfo_t* info, void* ctxt) {
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sigpipeSeen = 1;
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}
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// Signal handler that uses up more stack space than a goroutine will have.
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static void ioHandler(int signo, siginfo_t* info, void* ctxt) {
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char a[1024];
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recur(4, a);
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sigioSeen = 1;
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}
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static jmp_buf jmp;
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static char* nullPointer;
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// An arbitrary function which requires proper stack alignment; see
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// http://golang.org/issue/17641.
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static void callWithVarargs(void* dummy, ...) {
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va_list args;
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va_start(args, dummy);
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va_end(args);
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}
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// Signal handler for SIGSEGV on a C thread.
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static void segvHandler(int signo, siginfo_t* info, void* ctxt) {
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sigset_t mask;
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int i;
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// Call an arbitrary function that requires the stack to be properly aligned.
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callWithVarargs("dummy arg", 3.1415);
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if (sigemptyset(&mask) < 0) {
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die("sigemptyset");
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}
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if (sigaddset(&mask, SIGSEGV) < 0) {
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die("sigaddset");
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}
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i = sigprocmask(SIG_UNBLOCK, &mask, NULL);
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if (i != 0) {
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fprintf(stderr, "sigprocmask: %s\n", strerror(i));
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exit(EXIT_FAILURE);
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}
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// Don't try this at home.
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longjmp(jmp, signo);
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// We should never get here.
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abort();
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}
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// Set up the signal handlers in a high priority constructor,
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// so that they are installed before the Go code starts.
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static void init(void) __attribute__ ((constructor (200)));
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static void init() {
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struct sigaction sa;
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memset(&sa, 0, sizeof sa);
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sa.sa_sigaction = ioHandler;
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if (sigemptyset(&sa.sa_mask) < 0) {
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die("sigemptyset");
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}
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sa.sa_flags = SA_SIGINFO;
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if (sigaction(SIGIO, &sa, NULL) < 0) {
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die("sigaction");
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}
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sa.sa_sigaction = segvHandler;
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if (sigaction(SIGSEGV, &sa, NULL) < 0 || sigaction(SIGBUS, &sa, NULL) < 0) {
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die("sigaction");
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}
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sa.sa_sigaction = pipeHandler;
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if (sigaction(SIGPIPE, &sa, NULL) < 0) {
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die("sigaction");
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}
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}
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int main(int argc, char** argv) {
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int verbose;
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sigset_t mask;
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int i;
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struct timespec ts;
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int darwin;
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darwin = atoi(argv[1]);
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verbose = argc > 2;
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setvbuf(stdout, NULL, _IONBF, 0);
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// Call setsid so that we can use kill(0, SIGIO) below.
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// Don't check the return value so that this works both from
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// a job control shell and from a shell script.
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setsid();
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if (verbose) {
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printf("calling RunGoroutines\n");
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}
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RunGoroutines();
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// Block SIGIO in this thread to make it more likely that it
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// will be delivered to a goroutine.
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if (verbose) {
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printf("calling pthread_sigmask\n");
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}
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if (sigemptyset(&mask) < 0) {
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die("sigemptyset");
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}
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if (sigaddset(&mask, SIGIO) < 0) {
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die("sigaddset");
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}
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i = pthread_sigmask(SIG_BLOCK, &mask, NULL);
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if (i != 0) {
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fprintf(stderr, "pthread_sigmask: %s\n", strerror(i));
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exit(EXIT_FAILURE);
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}
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if (verbose) {
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printf("calling kill\n");
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}
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if (kill(0, SIGIO) < 0) {
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die("kill");
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}
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if (verbose) {
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printf("waiting for sigioSeen\n");
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}
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// Wait until the signal has been delivered.
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i = 0;
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while (!sigioSeen) {
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ts.tv_sec = 0;
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ts.tv_nsec = 1000000;
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nanosleep(&ts, NULL);
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i++;
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if (i > 5000) {
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fprintf(stderr, "looping too long waiting for SIGIO\n");
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exit(EXIT_FAILURE);
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}
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}
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if (verbose) {
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printf("provoking SIGPIPE\n");
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}
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// SIGPIPE is never forwarded on Darwin, see golang.org/issue/33384.
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if (!darwin) {
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GoRaiseSIGPIPE();
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if (verbose) {
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printf("waiting for sigpipeSeen\n");
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}
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// Wait until the signal has been delivered.
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i = 0;
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while (!sigpipeSeen) {
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ts.tv_sec = 0;
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ts.tv_nsec = 1000000;
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nanosleep(&ts, NULL);
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i++;
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if (i > 5000) {
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fprintf(stderr, "looping too long waiting for SIGPIPE\n");
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exit(EXIT_FAILURE);
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}
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}
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}
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if (verbose) {
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printf("calling setjmp\n");
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}
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// Test that a SIGSEGV on this thread is delivered to us.
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if (setjmp(jmp) == 0) {
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if (verbose) {
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printf("triggering SIGSEGV\n");
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}
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*nullPointer = '\0';
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fprintf(stderr, "continued after address error\n");
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exit(EXIT_FAILURE);
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}
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if (verbose) {
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printf("calling TestSEGV\n");
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}
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TestSEGV();
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printf("PASS\n");
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return 0;
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}
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