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Java example source code file (java_md_macosx.c)
The java_md_macosx.c Java example source code/* * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ #include "java.h" #include "jvm_md.h" #include <dirent.h> #include <dlfcn.h> #include <fcntl.h> #include <inttypes.h> #include <stdio.h> #include <string.h> #include <stdlib.h> #include <sys/stat.h> #include <unistd.h> #include <sys/types.h> #include <sys/time.h> #include "manifest_info.h" #include "version_comp.h" /* Support Cocoa event loop on the main thread */ #include <Cocoa/Cocoa.h> #include <objc/objc-runtime.h> #include <objc/objc-auto.h> #include <errno.h> #include <spawn.h> struct NSAppArgs { int argc; char **argv; }; #define JVM_DLL "libjvm.dylib" #define JAVA_DLL "libjava.dylib" /* FALLBACK avoids naming conflicts with system libraries * (eg, ImageIO's libJPEG.dylib) */ #define LD_LIBRARY_PATH "DYLD_FALLBACK_LIBRARY_PATH" /* * If a processor / os combination has the ability to run binaries of * two data models and cohabitation of jre/jdk bits with both data * models is supported, then DUAL_MODE is defined. MacOSX is a hybrid * system in that, the universal library can contain all types of libraries * 32/64 and client/server, thus the spawn is capable of linking with the * appropriate library as requested. * * Notes: * 1. VM. DUAL_MODE is disabled, and not supported, however, it is left here in * for experimentation and perhaps enable it in the future. * 2. At the time of this writing, the universal library contains only * a server 64-bit server JVM. * 3. "-client" command line option is supported merely as a command line flag, * for, compatibility reasons, however, a server VM will be launched. */ /* * Flowchart of launcher execs and options processing on unix * * The selection of the proper vm shared library to open depends on * several classes of command line options, including vm "flavor" * options (-client, -server) and the data model options, -d32 and * -d64, as well as a version specification which may have come from * the command line or from the manifest of an executable jar file. * The vm selection options are not passed to the running * virtual machine; they must be screened out by the launcher. * * The version specification (if any) is processed first by the * platform independent routine SelectVersion. This may result in * the exec of the specified launcher version. * * Now, in most cases,the launcher will dlopen the target libjvm.so. All * required libraries are loaded by the runtime linker, using the known paths * baked into the shared libraries at compile time. Therefore, * in most cases, the launcher will only exec, if the data models are * mismatched, and will not set any environment variables, regardless of the * data models. * * * * Main * (incoming argv) * | * \|/ * SelectVersion * (selects the JRE version, note: not data model) * | * \|/ * CreateExecutionEnvironment * (determines desired data model) * | * | * \|/ * Have Desired Model ? --> NO --> Is Dual-Mode ? --> NO --> Exit(with error) * | | * | | * | \|/ * | YES * | | * | | * | \|/ * | CheckJvmType * | (removes -client, -server etc.) * | | * | | * \|/ \|/ * YES Find the desired executable/library * | | * | | * \|/ \|/ * CheckJvmType POINT A * (removes -client, -server, etc.) * | * | * \|/ * TranslateDashJArgs... * (Prepare to pass args to vm) * | * | * \|/ * ParseArguments * (removes -d32 and -d64 if any, * processes version options, * creates argument list for vm, * etc.) * | * | * \|/ * POINT A * | * | * \|/ * Path is desired JRE ? YES --> Have Desired Model ? NO --> Re-exec --> Main * NO YES --> Continue * | * | * \|/ * Paths have well known * jvm paths ? --> NO --> Have Desired Model ? NO --> Re-exec --> Main * YES YES --> Continue * | * | * \|/ * Does libjvm.so exist * in any of them ? --> NO --> Have Desired Model ? NO --> Re-exec --> Main * YES YES --> Continue * | * | * \|/ * Re-exec / Spawn * | * | * \|/ * Main */ #define GetArch() GetArchPath(CURRENT_DATA_MODEL) /* Store the name of the executable once computed */ static char *execname = NULL; /* * execname accessor from other parts of platform dependent logic */ const char * GetExecName() { return execname; } const char * GetArchPath(int nbits) { switch(nbits) { default: return LIBARCHNAME; } } /* * Exports the JNI interface from libjli * * This allows client code to link against the .jre/.jdk bundles, * and not worry about trying to pick a HotSpot to link against. * * Switching architectures is unsupported, since client code has * made that choice before the JVM was requested. */ static InvocationFunctions *sExportedJNIFunctions = NULL; static char *sPreferredJVMType = NULL; static InvocationFunctions *GetExportedJNIFunctions() { if (sExportedJNIFunctions != NULL) return sExportedJNIFunctions; char jrePath[PATH_MAX]; jboolean gotJREPath = GetJREPath(jrePath, sizeof(jrePath), GetArch(), JNI_FALSE); if (!gotJREPath) { JLI_ReportErrorMessage("Failed to GetJREPath()"); return NULL; } char *preferredJVM = sPreferredJVMType; if (preferredJVM == NULL) { #if defined(__i386__) preferredJVM = "client"; #elif defined(__x86_64__) preferredJVM = "server"; #else #error "Unknown architecture - needs definition" #endif } char jvmPath[PATH_MAX]; jboolean gotJVMPath = GetJVMPath(jrePath, preferredJVM, jvmPath, sizeof(jvmPath), GetArch(), CURRENT_DATA_MODEL); if (!gotJVMPath) { JLI_ReportErrorMessage("Failed to GetJVMPath()"); return NULL; } InvocationFunctions *fxns = malloc(sizeof(InvocationFunctions)); jboolean vmLoaded = LoadJavaVM(jvmPath, fxns); if (!vmLoaded) { JLI_ReportErrorMessage("Failed to LoadJavaVM()"); return NULL; } return sExportedJNIFunctions = fxns; } JNIEXPORT jint JNICALL JNI_GetDefaultJavaVMInitArgs(void *args) { InvocationFunctions *ifn = GetExportedJNIFunctions(); if (ifn == NULL) return JNI_ERR; return ifn->GetDefaultJavaVMInitArgs(args); } JNIEXPORT jint JNICALL JNI_CreateJavaVM(JavaVM **pvm, void **penv, void *args) { InvocationFunctions *ifn = GetExportedJNIFunctions(); if (ifn == NULL) return JNI_ERR; return ifn->CreateJavaVM(pvm, penv, args); } JNIEXPORT jint JNICALL JNI_GetCreatedJavaVMs(JavaVM **vmBuf, jsize bufLen, jsize *nVMs) { InvocationFunctions *ifn = GetExportedJNIFunctions(); if (ifn == NULL) return JNI_ERR; return ifn->GetCreatedJavaVMs(vmBuf, bufLen, nVMs); } /* * Allow JLI-aware launchers to specify a client/server preference */ JNIEXPORT void JNICALL JLI_SetPreferredJVM(const char *prefJVM) { if (sPreferredJVMType != NULL) { free(sPreferredJVMType); sPreferredJVMType = NULL; } if (prefJVM == NULL) return; sPreferredJVMType = strdup(prefJVM); } static BOOL awtLoaded = NO; static pthread_mutex_t awtLoaded_mutex = PTHREAD_MUTEX_INITIALIZER; static pthread_cond_t awtLoaded_cv = PTHREAD_COND_INITIALIZER; JNIEXPORT void JNICALL JLI_NotifyAWTLoaded() { pthread_mutex_lock(&awtLoaded_mutex); awtLoaded = YES; pthread_cond_signal(&awtLoaded_cv); pthread_mutex_unlock(&awtLoaded_mutex); } static int (*main_fptr)(int argc, char **argv) = NULL; /* * Unwrap the arguments and re-run main() */ static void *apple_main (void *arg) { objc_registerThreadWithCollector(); if (main_fptr == NULL) { main_fptr = (int (*)())dlsym(RTLD_DEFAULT, "main"); if (main_fptr == NULL) { JLI_ReportErrorMessageSys("error locating main entrypoint\n"); exit(1); } } struct NSAppArgs *args = (struct NSAppArgs *) arg; exit(main_fptr(args->argc, args->argv)); } static void dummyTimer(CFRunLoopTimerRef timer, void *info) {} static void ParkEventLoop() { // RunLoop needs at least one source, and 1e20 is pretty far into the future CFRunLoopTimerRef t = CFRunLoopTimerCreate(kCFAllocatorDefault, 1.0e20, 0.0, 0, 0, dummyTimer, NULL); CFRunLoopAddTimer(CFRunLoopGetCurrent(), t, kCFRunLoopDefaultMode); CFRelease(t); // Park this thread in the main run loop. int32_t result; do { result = CFRunLoopRunInMode(kCFRunLoopDefaultMode, 1.0e20, false); } while (result != kCFRunLoopRunFinished); } /* * Mac OS X mandates that the GUI event loop run on very first thread of * an application. This requires that we re-call Java's main() on a new * thread, reserving the 'main' thread for Cocoa. */ static void MacOSXStartup(int argc, char *argv[]) { // Thread already started? static jboolean started = false; if (started) { return; } started = true; // Hand off arguments struct NSAppArgs args; args.argc = argc; args.argv = argv; // Fire up the main thread pthread_t main_thr; if (pthread_create(&main_thr, NULL, &apple_main, &args) != 0) { JLI_ReportErrorMessageSys("Could not create main thread: %s\n", strerror(errno)); exit(1); } if (pthread_detach(main_thr)) { JLI_ReportErrorMessageSys("pthread_detach() failed: %s\n", strerror(errno)); exit(1); } ParkEventLoop(); } void CreateExecutionEnvironment(int *pargc, char ***pargv, char jrepath[], jint so_jrepath, char jvmpath[], jint so_jvmpath, char jvmcfg[], jint so_jvmcfg) { /* * First, determine if we are running the desired data model. If we * are running the desired data model, all the error messages * associated with calling GetJREPath, ReadKnownVMs, etc. should be * output. However, if we are not running the desired data model, * some of the errors should be suppressed since it is more * informative to issue an error message based on whether or not the * os/processor combination has dual mode capabilities. */ jboolean jvmpathExists; /* Compute/set the name of the executable */ SetExecname(*pargv); /* Check data model flags, and exec process, if needed */ { char *arch = (char *)GetArch(); /* like sparc or sparcv9 */ char * jvmtype = NULL; int argc = *pargc; char **argv = *pargv; int running = CURRENT_DATA_MODEL; int wanted = running; /* What data mode is being asked for? Current model is fine unless another model is asked for */ char** newargv = NULL; int newargc = 0; /* * Starting in 1.5, all unix platforms accept the -d32 and -d64 * options. On platforms where only one data-model is supported * (e.g. ia-64 Linux), using the flag for the other data model is * an error and will terminate the program. */ { /* open new scope to declare local variables */ int i; newargv = (char **)JLI_MemAlloc((argc+1) * sizeof(char*)); newargv[newargc++] = argv[0]; /* scan for data model arguments and remove from argument list; last occurrence determines desired data model */ for (i=1; i < argc; i++) { if (JLI_StrCmp(argv[i], "-J-d64") == 0 || JLI_StrCmp(argv[i], "-d64") == 0) { wanted = 64; continue; } if (JLI_StrCmp(argv[i], "-J-d32") == 0 || JLI_StrCmp(argv[i], "-d32") == 0) { wanted = 32; continue; } newargv[newargc++] = argv[i]; if (IsJavaArgs()) { if (argv[i][0] != '-') continue; } else { if (JLI_StrCmp(argv[i], "-classpath") == 0 || JLI_StrCmp(argv[i], "-cp") == 0) { i++; if (i >= argc) break; newargv[newargc++] = argv[i]; continue; } if (argv[i][0] != '-') { i++; break; } } } /* copy rest of args [i .. argc) */ while (i < argc) { newargv[newargc++] = argv[i++]; } newargv[newargc] = NULL; /* * newargv has all proper arguments here */ argc = newargc; argv = newargv; } /* If the data model is not changing, it is an error if the jvmpath does not exist */ if (wanted == running) { /* Find out where the JRE is that we will be using. */ if (!GetJREPath(jrepath, so_jrepath, arch, JNI_FALSE) ) { JLI_ReportErrorMessage(JRE_ERROR1); exit(2); } JLI_Snprintf(jvmcfg, so_jvmcfg, "%s%slib%s%s%sjvm.cfg", jrepath, FILESEP, FILESEP, "", ""); /* Find the specified JVM type */ if (ReadKnownVMs(jvmcfg, JNI_FALSE) < 1) { JLI_ReportErrorMessage(CFG_ERROR7); exit(1); } jvmpath[0] = '\0'; jvmtype = CheckJvmType(pargc, pargv, JNI_FALSE); if (JLI_StrCmp(jvmtype, "ERROR") == 0) { JLI_ReportErrorMessage(CFG_ERROR9); exit(4); } if (!GetJVMPath(jrepath, jvmtype, jvmpath, so_jvmpath, arch, wanted)) { JLI_ReportErrorMessage(CFG_ERROR8, jvmtype, jvmpath); exit(4); } /* * Mac OS X requires the Cocoa event loop to be run on the "main" * thread. Spawn off a new thread to run main() and pass * this thread off to the Cocoa event loop. */ MacOSXStartup(argc, argv); /* * we seem to have everything we need, so without further ado * we return back, otherwise proceed to set the environment. */ return; } else { /* do the same speculatively or exit */ #if defined(DUAL_MODE) if (running != wanted) { /* Find out where the JRE is that we will be using. */ if (!GetJREPath(jrepath, so_jrepath, GetArchPath(wanted), JNI_TRUE)) { /* give up and let other code report error message */ JLI_ReportErrorMessage(JRE_ERROR2, wanted); exit(1); } JLI_Snprintf(jvmcfg, so_jvmcfg, "%s%slib%s%s%sjvm.cfg", jrepath, FILESEP, FILESEP, "", ""); /* * Read in jvm.cfg for target data model and process vm * selection options. */ if (ReadKnownVMs(jvmcfg, JNI_TRUE) < 1) { /* give up and let other code report error message */ JLI_ReportErrorMessage(JRE_ERROR2, wanted); exit(1); } jvmpath[0] = '\0'; jvmtype = CheckJvmType(pargc, pargv, JNI_TRUE); if (JLI_StrCmp(jvmtype, "ERROR") == 0) { JLI_ReportErrorMessage(CFG_ERROR9); exit(4); } /* exec child can do error checking on the existence of the path */ jvmpathExists = GetJVMPath(jrepath, jvmtype, jvmpath, so_jvmpath, GetArchPath(wanted), wanted); } #else /* ! DUAL_MODE */ JLI_ReportErrorMessage(JRE_ERROR2, wanted); exit(1); #endif /* DUAL_MODE */ } { char *newexec = execname; JLI_TraceLauncher("TRACER_MARKER:About to EXEC\n"); (void) fflush(stdout); (void) fflush(stderr); /* * Use posix_spawn() instead of execv() on Mac OS X. * This allows us to choose which architecture the child process * should run as. */ { posix_spawnattr_t attr; size_t unused_size; pid_t unused_pid; #if defined(__i386__) || defined(__x86_64__) cpu_type_t cpu_type[] = { (wanted == 64) ? CPU_TYPE_X86_64 : CPU_TYPE_X86, (running== 64) ? CPU_TYPE_X86_64 : CPU_TYPE_X86 }; #else cpu_type_t cpu_type[] = { CPU_TYPE_ANY }; #endif /* __i386 .. */ posix_spawnattr_init(&attr); posix_spawnattr_setflags(&attr, POSIX_SPAWN_SETEXEC); posix_spawnattr_setbinpref_np(&attr, sizeof(cpu_type) / sizeof(cpu_type_t), cpu_type, &unused_size); posix_spawn(&unused_pid, newexec, NULL, &attr, argv, environ); } JLI_ReportErrorMessageSys(JRE_ERROR4, newexec); #if defined(DUAL_MODE) if (running != wanted) { JLI_ReportErrorMessage(JRE_ERROR5, wanted, running); } #endif /* DUAL_MODE */ } exit(1); } } /* * VM choosing is done by the launcher (java.c). */ static jboolean GetJVMPath(const char *jrepath, const char *jvmtype, char *jvmpath, jint jvmpathsize, const char * arch, int bitsWanted) { struct stat s; if (JLI_StrChr(jvmtype, '/')) { JLI_Snprintf(jvmpath, jvmpathsize, "%s/" JVM_DLL, jvmtype); } else { /* * macosx client library is built thin, i386 only. * 64 bit client requests must load server library */ const char *jvmtypeUsed = ((bitsWanted == 64) && (strcmp(jvmtype, "client") == 0)) ? "server" : jvmtype; JLI_Snprintf(jvmpath, jvmpathsize, "%s/lib/%s/" JVM_DLL, jrepath, jvmtypeUsed); } JLI_TraceLauncher("Does `%s' exist ... ", jvmpath); if (stat(jvmpath, &s) == 0) { JLI_TraceLauncher("yes.\n"); return JNI_TRUE; } else { JLI_TraceLauncher("no.\n"); return JNI_FALSE; } } /* * Find path to JRE based on .exe's location or registry settings. */ static jboolean GetJREPath(char *path, jint pathsize, const char * arch, jboolean speculative) { char libjava[MAXPATHLEN]; if (GetApplicationHome(path, pathsize)) { /* Is JRE co-located with the application? */ JLI_Snprintf(libjava, sizeof(libjava), "%s/lib/" JAVA_DLL, path); if (access(libjava, F_OK) == 0) { return JNI_TRUE; } /* Does the app ship a private JRE in <apphome>/jre directory? */ JLI_Snprintf(libjava, sizeof(libjava), "%s/jre/lib/" JAVA_DLL, path); if (access(libjava, F_OK) == 0) { JLI_StrCat(path, "/jre"); JLI_TraceLauncher("JRE path is %s\n", path); return JNI_TRUE; } } /* try to find ourselves instead */ Dl_info selfInfo; dladdr(&GetJREPath, &selfInfo); char *realPathToSelf = realpath(selfInfo.dli_fname, path); if (realPathToSelf != path) { return JNI_FALSE; } size_t pathLen = strlen(realPathToSelf); if (pathLen == 0) { return JNI_FALSE; } const char lastPathComponent[] = "/lib/jli/libjli.dylib"; size_t sizeOfLastPathComponent = sizeof(lastPathComponent) - 1; if (pathLen < sizeOfLastPathComponent) { return JNI_FALSE; } size_t indexOfLastPathComponent = pathLen - sizeOfLastPathComponent; if (0 == strncmp(realPathToSelf + indexOfLastPathComponent, lastPathComponent, sizeOfLastPathComponent - 1)) { realPathToSelf[indexOfLastPathComponent + 1] = '\0'; return JNI_TRUE; } if (!speculative) JLI_ReportErrorMessage(JRE_ERROR8 JAVA_DLL); return JNI_FALSE; } jboolean LoadJavaVM(const char *jvmpath, InvocationFunctions *ifn) { Dl_info dlinfo; void *libjvm; JLI_TraceLauncher("JVM path is %s\n", jvmpath); libjvm = dlopen(jvmpath, RTLD_NOW + RTLD_GLOBAL); if (libjvm == NULL) { JLI_ReportErrorMessage(DLL_ERROR1, __LINE__); JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror()); return JNI_FALSE; } ifn->CreateJavaVM = (CreateJavaVM_t) dlsym(libjvm, "JNI_CreateJavaVM"); if (ifn->CreateJavaVM == NULL) { JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror()); return JNI_FALSE; } ifn->GetDefaultJavaVMInitArgs = (GetDefaultJavaVMInitArgs_t) dlsym(libjvm, "JNI_GetDefaultJavaVMInitArgs"); if (ifn->GetDefaultJavaVMInitArgs == NULL) { JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror()); return JNI_FALSE; } ifn->GetCreatedJavaVMs = (GetCreatedJavaVMs_t) dlsym(libjvm, "JNI_GetCreatedJavaVMs"); if (ifn->GetCreatedJavaVMs == NULL) { JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror()); return JNI_FALSE; } return JNI_TRUE; } /* * Compute the name of the executable * * In order to re-exec securely we need the absolute path of the * executable. On Solaris getexecname(3c) may not return an absolute * path so we use dladdr to get the filename of the executable and * then use realpath to derive an absolute path. From Solaris 9 * onwards the filename returned in DL_info structure from dladdr is * an absolute pathname so technically realpath isn't required. * On Linux we read the executable name from /proc/self/exe. * As a fallback, and for platforms other than Solaris and Linux, * we use FindExecName to compute the executable name. */ const char* SetExecname(char **argv) { char* exec_path = NULL; { Dl_info dlinfo; int (*fptr)(); fptr = (int (*)())dlsym(RTLD_DEFAULT, "main"); if (fptr == NULL) { JLI_ReportErrorMessage(DLL_ERROR3, dlerror()); return JNI_FALSE; } if (dladdr((void*)fptr, &dlinfo)) { char *resolved = (char*)JLI_MemAlloc(PATH_MAX+1); if (resolved != NULL) { exec_path = realpath(dlinfo.dli_fname, resolved); if (exec_path == NULL) { JLI_MemFree(resolved); } } } } if (exec_path == NULL) { exec_path = FindExecName(argv[0]); } execname = exec_path; return exec_path; } /* * BSD's implementation of CounterGet() */ int64_t CounterGet() { struct timeval tv; gettimeofday(&tv, NULL); return (tv.tv_sec * 1000) + tv.tv_usec; } /* --- Splash Screen shared library support --- */ static JavaVM* SetJavaVMValue() { JavaVM * jvm = NULL; // The handle is good for both the launcher and the libosxapp.dylib void * handle = dlopen(NULL, RTLD_LAZY | RTLD_GLOBAL); if (handle) { typedef JavaVM* (*JLI_GetJavaVMInstance_t)(); JLI_GetJavaVMInstance_t JLI_GetJavaVMInstance = (JLI_GetJavaVMInstance_t)dlsym(handle, "JLI_GetJavaVMInstance"); if (JLI_GetJavaVMInstance) { jvm = JLI_GetJavaVMInstance(); } if (jvm) { typedef void (*OSXAPP_SetJavaVM_t)(JavaVM*); OSXAPP_SetJavaVM_t OSXAPP_SetJavaVM = (OSXAPP_SetJavaVM_t)dlsym(handle, "OSXAPP_SetJavaVM"); if (OSXAPP_SetJavaVM) { OSXAPP_SetJavaVM(jvm); } else { jvm = NULL; } } dlclose(handle); } return jvm; } static const char* SPLASHSCREEN_SO = JNI_LIB_NAME("splashscreen"); static void* hSplashLib = NULL; void* SplashProcAddress(const char* name) { if (!hSplashLib) { char jrePath[PATH_MAX]; if (!GetJREPath(jrePath, sizeof(jrePath), GetArch(), JNI_FALSE)) { JLI_ReportErrorMessage(JRE_ERROR1); return NULL; } char splashPath[PATH_MAX]; const int ret = JLI_Snprintf(splashPath, sizeof(splashPath), "%s/lib/%s", jrePath, SPLASHSCREEN_SO); if (ret >= (int)sizeof(splashPath)) { JLI_ReportErrorMessage(JRE_ERROR11); return NULL; } if (ret < 0) { JLI_ReportErrorMessage(JRE_ERROR13); return NULL; } hSplashLib = dlopen(splashPath, RTLD_LAZY | RTLD_GLOBAL); // It's OK if dlopen() fails. The splash screen library binary file // might have been stripped out from the JRE image to reduce its size // (e.g. on embedded platforms). if (hSplashLib) { if (!SetJavaVMValue()) { dlclose(hSplashLib); hSplashLib = NULL; } } } if (hSplashLib) { void* sym = dlsym(hSplashLib, name); return sym; } else { return NULL; } } void SplashFreeLibrary() { if (hSplashLib) { dlclose(hSplashLib); hSplashLib = NULL; } } /* * Block current thread and continue execution in a new thread */ int ContinueInNewThread0(int (JNICALL *continuation)(void *), jlong stack_size, void * args) { int rslt; pthread_t tid; pthread_attr_t attr; pthread_attr_init(&attr); pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE); if (stack_size > 0) { pthread_attr_setstacksize(&attr, stack_size); } if (pthread_create(&tid, &attr, (void *(*)(void*))continuation, (void*)args) == 0) { void * tmp; pthread_join(tid, &tmp); rslt = (int)tmp; } else { /* * Continue execution in current thread if for some reason (e.g. out of * memory/LWP) a new thread can't be created. This will likely fail * later in continuation as JNI_CreateJavaVM needs to create quite a * few new threads, anyway, just give it a try.. */ rslt = continuation(args); } pthread_attr_destroy(&attr); return rslt; } void SetJavaLauncherPlatformProps() { /* Linux only */ } jboolean ServerClassMachine(void) { return JNI_TRUE; } static JavaVM* jvmInstance = NULL; static jboolean sameThread = JNI_FALSE; /* start VM in current thread */ /* * Note there is a callback on this function from the splashscreen logic, * this as well SetJavaVMValue() needs to be simplified. */ JavaVM* JLI_GetJavaVMInstance() { return jvmInstance; } void RegisterThread() { objc_registerThreadWithCollector(); } static void SetXDockArgForAWT(const char *arg) { char envVar[80]; if (strstr(arg, "-Xdock:name=") == arg) { /* * The APP_NAME_<pid> environment variable is used to pass * an application name as specified with the -Xdock:name command * line option from Java launcher code to the AWT code in order * to assign this name to the app's dock tile on the Mac. * The _<pid> part is added to avoid collisions with child processes. * * WARNING: This environment variable is an implementation detail and * isn't meant for use outside of the core platform. The mechanism for * passing this information from Java launcher to other modules may * change drastically between update release, and it may even be * removed or replaced with another mechanism. * * NOTE: It is used by SWT, and JavaFX. */ snprintf(envVar, sizeof(envVar), "APP_NAME_%d", getpid()); setenv(envVar, (arg + 12), 1); } if (strstr(arg, "-Xdock:icon=") == arg) { /* * The APP_ICON_<pid> environment variable is used to pass * an application icon as specified with the -Xdock:icon command * line option from Java launcher code to the AWT code in order * to assign this icon to the app's dock tile on the Mac. * The _<pid> part is added to avoid collisions with child processes. * * WARNING: This environment variable is an implementation detail and * isn't meant for use outside of the core platform. The mechanism for * passing this information from Java launcher to other modules may * change drastically between update release, and it may even be * removed or replaced with another mechanism. * * NOTE: It is used by SWT, and JavaFX. */ snprintf(envVar, sizeof(envVar), "APP_ICON_%d", getpid()); setenv(envVar, (arg + 12), 1); } } static void SetMainClassForAWT(JNIEnv *env, jclass mainClass) { jclass classClass = NULL; NULL_CHECK(classClass = FindBootStrapClass(env, "java/lang/Class")); jmethodID getCanonicalNameMID = NULL; NULL_CHECK(getCanonicalNameMID = (*env)->GetMethodID(env, classClass, "getCanonicalName", "()Ljava/lang/String;")); jstring mainClassString = NULL; NULL_CHECK(mainClassString = (*env)->CallObjectMethod(env, mainClass, getCanonicalNameMID)); const char *mainClassName = NULL; NULL_CHECK(mainClassName = (*env)->GetStringUTFChars(env, mainClassString, NULL)); char envVar[80]; /* * The JAVA_MAIN_CLASS_<pid> environment variable is used to pass * the name of a Java class whose main() method is invoked by * the Java launcher code to start the application, to the AWT code * in order to assign the name to the Apple menu bar when the app * is active on the Mac. * The _<pid> part is added to avoid collisions with child processes. * * WARNING: This environment variable is an implementation detail and * isn't meant for use outside of the core platform. The mechanism for * passing this information from Java launcher to other modules may * change drastically between update release, and it may even be * removed or replaced with another mechanism. * * NOTE: It is used by SWT, and JavaFX. */ snprintf(envVar, sizeof(envVar), "JAVA_MAIN_CLASS_%d", getpid()); setenv(envVar, mainClassName, 1); (*env)->ReleaseStringUTFChars(env, mainClassString, mainClassName); } void SetXStartOnFirstThreadArg() { // XXX: BEGIN HACK // short circuit hack for <https://bugs.eclipse.org/bugs/show_bug.cgi?id=211625> // need a way to get AWT/Swing apps launched when spawned from Eclipse, // which currently has no UI to not pass the -XstartOnFirstThread option if (getenv("HACK_IGNORE_START_ON_FIRST_THREAD") != NULL) return; // XXX: END HACK sameThread = JNI_TRUE; // Set a variable that tells us we started on the main thread. // This is used by the AWT during startup. (See awt.m) char envVar[80]; snprintf(envVar, sizeof(envVar), "JAVA_STARTED_ON_FIRST_THREAD_%d", getpid()); setenv(envVar, "1", 1); } /* This class is made for performSelectorOnMainThread when java main * should be launched on main thread. * We cannot use dispatch_sync here, because it blocks the main dispatch queue * which is used inside Cocoa */ @interface JavaLaunchHelper : NSObject { int _returnValue; } - (void) launchJava:(NSValue*)argsValue; - (int) getReturnValue; @end @implementation JavaLaunchHelper - (void) launchJava:(NSValue*)argsValue { _returnValue = JavaMain([argsValue pointerValue]); } - (int) getReturnValue { return _returnValue; } @end // MacOSX we may continue in the same thread int JVMInit(InvocationFunctions* ifn, jlong threadStackSize, int argc, char **argv, int mode, char *what, int ret) { if (sameThread) { JLI_TraceLauncher("In same thread\n"); // need to block this thread against the main thread // so signals get caught correctly JavaMainArgs args; args.argc = argc; args.argv = argv; args.mode = mode; args.what = what; args.ifn = *ifn; int rslt; NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; { JavaLaunchHelper* launcher = [[[JavaLaunchHelper alloc] init] autorelease]; [launcher performSelectorOnMainThread:@selector(launchJava:) withObject:[NSValue valueWithPointer:(void*)&args] waitUntilDone:YES]; rslt = [launcher getReturnValue]; } [pool drain]; return rslt; } else { return ContinueInNewThread(ifn, threadStackSize, argc, argv, mode, what, ret); } } /* * Note the jvmInstance must be initialized first before entering into * ShowSplashScreen, as there is a callback into the JLI_GetJavaVMInstance. */ void PostJVMInit(JNIEnv *env, jstring mainClass, JavaVM *vm) { jvmInstance = vm; SetMainClassForAWT(env, mainClass); ShowSplashScreen(); } jboolean ProcessPlatformOption(const char* arg) { if (JLI_StrCmp(arg, "-XstartOnFirstThread") == 0) { SetXStartOnFirstThreadArg(); return JNI_TRUE; } else if (JLI_StrCCmp(arg, "-Xdock:") == 0) { SetXDockArgForAWT(arg); return JNI_TRUE; } // arguments we know not return JNI_FALSE; } Other Java examples (source code examples)Here is a short list of links related to this Java java_md_macosx.c source code file: |
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