// 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 #include #include #include #include #include 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; 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) { if (sched_yield() < 0) { perror("sched_yield"); } i++; if (i > 100000) { 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) { if (sched_yield() < 0) { perror("sched_yield"); } i++; if (i > 100000) { fprintf(stderr, "looping too long waiting for signal\n"); exit(EXIT_FAILURE); } } printf("PASS\n"); return 0; }