1 /************************************************************** 2 * 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * 20 *************************************************************/ 21 22 23 24 25 #include <stdio.h> 26 #include <string.h> 27 #include <errno.h> 28 #include <unistd.h> 29 #include <dlfcn.h> 30 31 /* 32 * NOTE: Since no one is really interested in correct unload behavior I've 33 * disabled the shared library unload check. If you want to reenable it comment 34 * the following line out 35 */ 36 #define NO_UNLOAD_CHECK 37 38 static const char *pprog_name = "checkdll"; 39 static const char *psymbol = "GetVersionInfo"; 40 41 void usage() 42 { 43 fprintf(stderr, "usage: %s [-s] <dllname>\n", pprog_name); 44 return; 45 } 46 47 int main(int argc, char *argv[]) 48 { 49 int rc; 50 int silent=0; 51 void *phandle; 52 char *(*pfun)(void); 53 54 if ( argc < 2 || argc > 4) { 55 usage(); 56 return 1; 57 } 58 59 if ( !strcmp(argv[1],"-s") ) { 60 silent = 1; 61 ++argv, --argc; 62 } 63 64 if ( (rc = access( argv[1], R_OK )) == -1 ) { 65 fprintf(stderr, "%s: ERROR: %s: %s\n", 66 pprog_name, argv[1], strerror(errno)); 67 return 2; 68 } 69 70 if (!silent) printf("Checking DLL %s ...", argv[1]); 71 fflush(stdout); 72 73 if ( (phandle = dlopen(argv[1], RTLD_NOW)) != NULL ) { 74 if ( (pfun = (char *(*)(void))dlsym(phandle, psymbol)) != NULL ) { 75 if (!silent) printf(": ok\n"); 76 } 77 else 78 { 79 printf(": WARNING: %s\n", dlerror()); 80 } 81 #ifdef NO_UNLOAD_CHECK 82 _exit(0); 83 #else 84 dlclose(phandle); 85 #endif 86 return 0; 87 } 88 89 printf(": ERROR: %s\n", dlerror()); 90 return 3; 91 } 92 93 94