1 // Copyright (c) 2017 VMware, Inc. 2 // Licensed under the Apache License, Version 2.0 (the "License") 3 #include <cstdlib> 4 5 #include "bcc_usdt.h" 6 7 namespace { 8 // Take this trick from llvm for forcing exported functions in helper 9 // libraries to be included in the final .so 10 struct LinkAll { LinkAll__anon8bbae6e40111::LinkAll11 LinkAll() { 12 // getenv never returns -1, but compiler doesn't know! 13 if (::getenv("bar") != (char *)-1) 14 return; 15 16 #ifdef EXPORT_USDT 17 (void)bcc_usdt_new_frompid(-1, nullptr); 18 (void)bcc_usdt_new_frompath(nullptr); 19 (void)bcc_usdt_close(nullptr); 20 #endif 21 } 22 } LinkAll; // declare one instance to invoke the constructor 23 } 24