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Code Editor : main3.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 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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