1/*
2 * Copyright (c) 2012, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26#include "java.h"
27#include "jvm_md.h"
28#include <dirent.h>
29#include <dlfcn.h>
30#include <fcntl.h>
31#include <inttypes.h>
32#include <stdio.h>
33#include <string.h>
34#include <stdlib.h>
35#include <sys/stat.h>
36#include <unistd.h>
37#include <sys/types.h>
38#include <sys/time.h>
39
40#include "manifest_info.h"
41
42/* Support Cocoa event loop on the main thread */
43#include <Cocoa/Cocoa.h>
44#include <objc/objc-runtime.h>
45#include <objc/objc-auto.h>
46
47#include <errno.h>
48#include <spawn.h>
49
50struct NSAppArgs {
51    int argc;
52    char **argv;
53};
54
55#define JVM_DLL "libjvm.dylib"
56#define JAVA_DLL "libjava.dylib"
57/* FALLBACK avoids naming conflicts with system libraries
58 * (eg, ImageIO's libJPEG.dylib) */
59#define LD_LIBRARY_PATH "DYLD_FALLBACK_LIBRARY_PATH"
60
61/*
62 * If a processor / os combination has the ability to run binaries of
63 * two data models and cohabitation of jre/jdk bits with both data
64 * models is supported, then DUAL_MODE is defined. MacOSX is a hybrid
65 * system in that, the universal library can contain all types of libraries
66 * 32/64 and client/server, thus the spawn is capable of linking with the
67 * appropriate library as requested.
68 *
69 * Notes:
70 * 1. VM. DUAL_MODE is disabled, and not supported, however, it is left here in
71 *    for experimentation and perhaps enable it in the future.
72 * 2. At the time of this writing, the universal library contains only
73 *    a server 64-bit server JVM.
74 * 3. "-client" command line option is supported merely as a command line flag,
75 *    for, compatibility reasons, however, a server VM will be launched.
76 */
77
78/*
79 * Flowchart of launcher execs and options processing on unix
80 *
81 * The selection of the proper vm shared library to open depends on
82 * several classes of command line options, including vm "flavor"
83 * options (-client, -server) and the data model options, -d32  and
84 * -d64, as well as a version specification which may have come from
85 * the command line or from the manifest of an executable jar file.
86 * The vm selection options are not passed to the running
87 * virtual machine; they must be screened out by the launcher.
88 *
89 * The version specification (if any) is processed first by the
90 * platform independent routine SelectVersion.  This may result in
91 * the exec of the specified launcher version.
92 *
93 * Now, in most cases,the launcher will dlopen the target libjvm.so. All
94 * required libraries are loaded by the runtime linker, using the known paths
95 * baked into the shared libraries at compile time. Therefore,
96 * in most cases, the launcher will only exec, if the data models are
97 * mismatched, and will not set any environment variables, regardless of the
98 * data models.
99 *
100 *
101 *
102 *  Main
103 *  (incoming argv)
104 *  |
105 * \|/
106 * CreateExecutionEnvironment
107 * (determines desired data model)
108 *  |
109 *  |
110 * \|/
111 *  Have Desired Model ? --> NO --> Is Dual-Mode ? --> NO --> Exit(with error)
112 *  |                                          |
113 *  |                                          |
114 *  |                                         \|/
115 *  |                                         YES
116 *  |                                          |
117 *  |                                          |
118 *  |                                         \|/
119 *  |                                CheckJvmType
120 *  |                               (removes -client, -server etc.)
121 *  |                                          |
122 *  |                                          |
123 * \|/                                        \|/
124 * YES                             Find the desired executable/library
125 *  |                                          |
126 *  |                                          |
127 * \|/                                        \|/
128 * CheckJvmType                             POINT A
129 * (removes -client, -server, etc.)
130 *  |
131 *  |
132 * \|/
133 * TranslateDashJArgs...
134 * (Prepare to pass args to vm)
135 *  |
136 *  |
137 * \|/
138 * ParseArguments
139 * (processes version options,
140 *  creates argument list for vm,
141 *  etc.)
142 *   |
143 *   |
144 *  \|/
145 * POINT A
146 *   |
147 *   |
148 *  \|/
149 * Path is desired JRE ? YES --> Continue
150 *  NO
151 *   |
152 *   |
153 *  \|/
154 * Paths have well known
155 * jvm paths ?       --> NO --> Continue
156 *  YES
157 *   |
158 *   |
159 *  \|/
160 *  Does libjvm.so exist
161 *  in any of them ? --> NO --> Continue
162 *   YES
163 *   |
164 *   |
165 *  \|/
166 * Re-exec / Spawn
167 *   |
168 *   |
169 *  \|/
170 * Main
171 */
172
173/* Store the name of the executable once computed */
174static char *execname = NULL;
175
176/*
177 * execname accessor from other parts of platform dependent logic
178 */
179const char *
180GetExecName() {
181    return execname;
182}
183
184/*
185 * Exports the JNI interface from libjli
186 *
187 * This allows client code to link against the .jre/.jdk bundles,
188 * and not worry about trying to pick a HotSpot to link against.
189 *
190 * Switching architectures is unsupported, since client code has
191 * made that choice before the JVM was requested.
192 */
193
194static InvocationFunctions *sExportedJNIFunctions = NULL;
195static char *sPreferredJVMType = NULL;
196
197static InvocationFunctions *GetExportedJNIFunctions() {
198    if (sExportedJNIFunctions != NULL) return sExportedJNIFunctions;
199
200    char jrePath[PATH_MAX];
201    jboolean gotJREPath = GetJREPath(jrePath, sizeof(jrePath), JNI_FALSE);
202    if (!gotJREPath) {
203        JLI_ReportErrorMessage("Failed to GetJREPath()");
204        return NULL;
205    }
206
207    char *preferredJVM = sPreferredJVMType;
208    if (preferredJVM == NULL) {
209#if defined(__i386__)
210        preferredJVM = "client";
211#elif defined(__x86_64__)
212        preferredJVM = "server";
213#else
214#error "Unknown architecture - needs definition"
215#endif
216    }
217
218    char jvmPath[PATH_MAX];
219    jboolean gotJVMPath = GetJVMPath(jrePath, preferredJVM, jvmPath, sizeof(jvmPath));
220    if (!gotJVMPath) {
221        JLI_ReportErrorMessage("Failed to GetJVMPath()");
222        return NULL;
223    }
224
225    InvocationFunctions *fxns = malloc(sizeof(InvocationFunctions));
226    jboolean vmLoaded = LoadJavaVM(jvmPath, fxns);
227    if (!vmLoaded) {
228        JLI_ReportErrorMessage("Failed to LoadJavaVM()");
229        return NULL;
230    }
231
232    return sExportedJNIFunctions = fxns;
233}
234
235#ifndef STATIC_BUILD
236
237JNIEXPORT jint JNICALL
238JNI_GetDefaultJavaVMInitArgs(void *args) {
239    InvocationFunctions *ifn = GetExportedJNIFunctions();
240    if (ifn == NULL) return JNI_ERR;
241    return ifn->GetDefaultJavaVMInitArgs(args);
242}
243
244JNIEXPORT jint JNICALL
245JNI_CreateJavaVM(JavaVM **pvm, void **penv, void *args) {
246    InvocationFunctions *ifn = GetExportedJNIFunctions();
247    if (ifn == NULL) return JNI_ERR;
248    return ifn->CreateJavaVM(pvm, penv, args);
249}
250
251JNIEXPORT jint JNICALL
252JNI_GetCreatedJavaVMs(JavaVM **vmBuf, jsize bufLen, jsize *nVMs) {
253    InvocationFunctions *ifn = GetExportedJNIFunctions();
254    if (ifn == NULL) return JNI_ERR;
255    return ifn->GetCreatedJavaVMs(vmBuf, bufLen, nVMs);
256}
257#endif
258
259/*
260 * Allow JLI-aware launchers to specify a client/server preference
261 */
262JNIEXPORT void JNICALL
263JLI_SetPreferredJVM(const char *prefJVM) {
264    if (sPreferredJVMType != NULL) {
265        free(sPreferredJVMType);
266        sPreferredJVMType = NULL;
267    }
268
269    if (prefJVM == NULL) return;
270    sPreferredJVMType = strdup(prefJVM);
271}
272
273static BOOL awtLoaded = NO;
274static pthread_mutex_t awtLoaded_mutex = PTHREAD_MUTEX_INITIALIZER;
275static pthread_cond_t  awtLoaded_cv = PTHREAD_COND_INITIALIZER;
276
277JNIEXPORT void JNICALL
278JLI_NotifyAWTLoaded()
279{
280    pthread_mutex_lock(&awtLoaded_mutex);
281    awtLoaded = YES;
282    pthread_cond_signal(&awtLoaded_cv);
283    pthread_mutex_unlock(&awtLoaded_mutex);
284}
285
286static int (*main_fptr)(int argc, char **argv) = NULL;
287
288/*
289 * Unwrap the arguments and re-run main()
290 */
291static void *apple_main (void *arg)
292{
293    if (main_fptr == NULL) {
294#ifdef STATIC_BUILD
295        extern int main(int argc, char **argv);
296        main_fptr = &main;
297#else
298        main_fptr = (int (*)())dlsym(RTLD_DEFAULT, "main");
299#endif
300        if (main_fptr == NULL) {
301            JLI_ReportErrorMessageSys("error locating main entrypoint\n");
302            exit(1);
303        }
304    }
305
306    struct NSAppArgs *args = (struct NSAppArgs *) arg;
307    exit(main_fptr(args->argc, args->argv));
308}
309
310static void dummyTimer(CFRunLoopTimerRef timer, void *info) {}
311
312static void ParkEventLoop() {
313    // RunLoop needs at least one source, and 1e20 is pretty far into the future
314    CFRunLoopTimerRef t = CFRunLoopTimerCreate(kCFAllocatorDefault, 1.0e20, 0.0, 0, 0, dummyTimer, NULL);
315    CFRunLoopAddTimer(CFRunLoopGetCurrent(), t, kCFRunLoopDefaultMode);
316    CFRelease(t);
317
318    // Park this thread in the main run loop.
319    int32_t result;
320    do {
321        result = CFRunLoopRunInMode(kCFRunLoopDefaultMode, 1.0e20, false);
322    } while (result != kCFRunLoopRunFinished);
323}
324
325/*
326 * Mac OS X mandates that the GUI event loop run on very first thread of
327 * an application. This requires that we re-call Java's main() on a new
328 * thread, reserving the 'main' thread for Cocoa.
329 */
330static void MacOSXStartup(int argc, char *argv[]) {
331    // Thread already started?
332    static jboolean started = false;
333    if (started) {
334        return;
335    }
336    started = true;
337
338    // Hand off arguments
339    struct NSAppArgs args;
340    args.argc = argc;
341    args.argv = argv;
342
343    // Fire up the main thread
344    pthread_t main_thr;
345    if (pthread_create(&main_thr, NULL, &apple_main, &args) != 0) {
346        JLI_ReportErrorMessageSys("Could not create main thread: %s\n", strerror(errno));
347        exit(1);
348    }
349    if (pthread_detach(main_thr)) {
350        JLI_ReportErrorMessageSys("pthread_detach() failed: %s\n", strerror(errno));
351        exit(1);
352    }
353
354    ParkEventLoop();
355}
356
357void
358CreateExecutionEnvironment(int *pargc, char ***pargv,
359                           char jrepath[], jint so_jrepath,
360                           char jvmpath[], jint so_jvmpath,
361                           char jvmcfg[],  jint so_jvmcfg) {
362    jboolean jvmpathExists;
363
364    /* Compute/set the name of the executable */
365    SetExecname(*pargv);
366
367    char * jvmtype    = NULL;
368    int  argc         = *pargc;
369    char **argv       = *pargv;
370
371    /* Find out where the JRE is that we will be using. */
372    if (!GetJREPath(jrepath, so_jrepath, JNI_FALSE) ) {
373        JLI_ReportErrorMessage(JRE_ERROR1);
374        exit(2);
375    }
376    JLI_Snprintf(jvmcfg, so_jvmcfg, "%s%slib%sjvm.cfg",
377                 jrepath, FILESEP, FILESEP);
378    /* Find the specified JVM type */
379    if (ReadKnownVMs(jvmcfg, JNI_FALSE) < 1) {
380        JLI_ReportErrorMessage(CFG_ERROR7);
381        exit(1);
382    }
383
384    jvmpath[0] = '\0';
385    jvmtype = CheckJvmType(pargc, pargv, JNI_FALSE);
386    if (JLI_StrCmp(jvmtype, "ERROR") == 0) {
387        JLI_ReportErrorMessage(CFG_ERROR9);
388        exit(4);
389    }
390
391    if (!GetJVMPath(jrepath, jvmtype, jvmpath, so_jvmpath)) {
392        JLI_ReportErrorMessage(CFG_ERROR8, jvmtype, jvmpath);
393        exit(4);
394    }
395
396    /*
397     * Mac OS X requires the Cocoa event loop to be run on the "main"
398     * thread. Spawn off a new thread to run main() and pass
399     * this thread off to the Cocoa event loop.
400     */
401    MacOSXStartup(argc, argv);
402
403    /*
404     * we seem to have everything we need
405     */
406    return;
407}
408
409/*
410 * VM choosing is done by the launcher (java.c).
411 */
412static jboolean
413GetJVMPath(const char *jrepath, const char *jvmtype,
414           char *jvmpath, jint jvmpathsize)
415{
416    struct stat s;
417
418    if (JLI_StrChr(jvmtype, '/')) {
419        JLI_Snprintf(jvmpath, jvmpathsize, "%s/" JVM_DLL, jvmtype);
420    } else {
421        /*
422         * macosx client library is built thin, i386 only.
423         * 64 bit client requests must load server library
424         */
425        JLI_Snprintf(jvmpath, jvmpathsize, "%s/lib/%s/" JVM_DLL, jrepath, jvmtype);
426    }
427
428    JLI_TraceLauncher("Does `%s' exist ... ", jvmpath);
429
430#ifdef STATIC_BUILD
431    return JNI_TRUE;
432#else
433    if (stat(jvmpath, &s) == 0) {
434        JLI_TraceLauncher("yes.\n");
435        return JNI_TRUE;
436    } else {
437        JLI_TraceLauncher("no.\n");
438        return JNI_FALSE;
439    }
440#endif
441}
442
443/*
444 * Find path to JRE based on .exe's location or registry settings.
445 */
446static jboolean
447GetJREPath(char *path, jint pathsize, jboolean speculative)
448{
449    char libjava[MAXPATHLEN];
450
451    if (GetApplicationHome(path, pathsize)) {
452        /* Is JRE co-located with the application? */
453#ifdef STATIC_BUILD
454        char jvm_cfg[MAXPATHLEN];
455        JLI_Snprintf(jvm_cfg, sizeof(jvm_cfg), "%s/lib/jvm.cfg", path);
456        if (access(jvm_cfg, F_OK) == 0) {
457            return JNI_TRUE;
458        }
459#else
460        JLI_Snprintf(libjava, sizeof(libjava), "%s/lib/" JAVA_DLL, path);
461        if (access(libjava, F_OK) == 0) {
462            return JNI_TRUE;
463        }
464#endif
465        /* ensure storage for path + /jre + NULL */
466        if ((JLI_StrLen(path) + 4 + 1) > (size_t) pathsize) {
467            JLI_TraceLauncher("Insufficient space to store JRE path\n");
468            return JNI_FALSE;
469        }
470        /* Does the app ship a private JRE in <apphome>/jre directory? */
471        JLI_Snprintf(libjava, sizeof(libjava), "%s/jre/lib/" JAVA_DLL, path);
472        if (access(libjava, F_OK) == 0) {
473            JLI_StrCat(path, "/jre");
474            JLI_TraceLauncher("JRE path is %s\n", path);
475            return JNI_TRUE;
476        }
477    }
478
479    /* try to find ourselves instead */
480    Dl_info selfInfo;
481    dladdr(&GetJREPath, &selfInfo);
482
483#ifdef STATIC_BUILD
484    char jvm_cfg[MAXPATHLEN];
485    char *p = NULL;
486    strncpy(jvm_cfg, selfInfo.dli_fname, MAXPATHLEN);
487    p = strrchr(jvm_cfg, '/'); *p = '\0';
488    p = strrchr(jvm_cfg, '/');
489    if (strcmp(p, "/.") == 0) {
490      *p = '\0';
491      p = strrchr(jvm_cfg, '/'); *p = '\0';
492    }
493    else *p = '\0';
494    strncpy(path, jvm_cfg, pathsize);
495    strncat(jvm_cfg, "/lib/jvm.cfg", MAXPATHLEN);
496    if (access(jvm_cfg, F_OK) == 0) {
497      return JNI_TRUE;
498    }
499#endif
500
501    char *realPathToSelf = realpath(selfInfo.dli_fname, path);
502    if (realPathToSelf != path) {
503        return JNI_FALSE;
504    }
505
506    size_t pathLen = strlen(realPathToSelf);
507    if (pathLen == 0) {
508        return JNI_FALSE;
509    }
510
511    const char lastPathComponent[] = "/lib/libjli.dylib";
512    size_t sizeOfLastPathComponent = sizeof(lastPathComponent) - 1;
513    if (pathLen < sizeOfLastPathComponent) {
514        return JNI_FALSE;
515    }
516
517    size_t indexOfLastPathComponent = pathLen - sizeOfLastPathComponent;
518    if (0 == strncmp(realPathToSelf + indexOfLastPathComponent, lastPathComponent, sizeOfLastPathComponent)) {
519        realPathToSelf[indexOfLastPathComponent + 1] = '\0';
520        return JNI_TRUE;
521    }
522
523    // If libjli.dylib is loaded from a macos bundle MacOS dir, find the JRE dir
524    // in ../Home.
525    const char altLastPathComponent[] = "/MacOS/libjli.dylib";
526    size_t sizeOfAltLastPathComponent = sizeof(altLastPathComponent) - 1;
527    if (pathLen < sizeOfLastPathComponent) {
528        return JNI_FALSE;
529    }
530
531    size_t indexOfAltLastPathComponent = pathLen - sizeOfAltLastPathComponent;
532    if (0 == strncmp(realPathToSelf + indexOfAltLastPathComponent, altLastPathComponent, sizeOfAltLastPathComponent)) {
533        JLI_Snprintf(realPathToSelf + indexOfAltLastPathComponent, sizeOfAltLastPathComponent, "%s", "/Home");
534        if (access(realPathToSelf, F_OK) == 0) {
535            return JNI_TRUE;
536        }
537    }
538
539    if (!speculative)
540      JLI_ReportErrorMessage(JRE_ERROR8 JAVA_DLL);
541    return JNI_FALSE;
542}
543
544jboolean
545LoadJavaVM(const char *jvmpath, InvocationFunctions *ifn)
546{
547    Dl_info dlinfo;
548    void *libjvm;
549
550    JLI_TraceLauncher("JVM path is %s\n", jvmpath);
551
552#ifndef STATIC_BUILD
553    libjvm = dlopen(jvmpath, RTLD_NOW + RTLD_GLOBAL);
554#else
555    libjvm = dlopen(NULL, RTLD_FIRST);
556#endif
557    if (libjvm == NULL) {
558        JLI_ReportErrorMessage(DLL_ERROR1, __LINE__);
559        JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
560        return JNI_FALSE;
561    }
562
563    ifn->CreateJavaVM = (CreateJavaVM_t)
564        dlsym(libjvm, "JNI_CreateJavaVM");
565    if (ifn->CreateJavaVM == NULL) {
566        JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
567        return JNI_FALSE;
568    }
569
570    ifn->GetDefaultJavaVMInitArgs = (GetDefaultJavaVMInitArgs_t)
571        dlsym(libjvm, "JNI_GetDefaultJavaVMInitArgs");
572    if (ifn->GetDefaultJavaVMInitArgs == NULL) {
573        JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
574        return JNI_FALSE;
575    }
576
577    ifn->GetCreatedJavaVMs = (GetCreatedJavaVMs_t)
578    dlsym(libjvm, "JNI_GetCreatedJavaVMs");
579    if (ifn->GetCreatedJavaVMs == NULL) {
580        JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
581        return JNI_FALSE;
582    }
583
584    return JNI_TRUE;
585}
586
587/*
588 * Compute the name of the executable
589 *
590 * In order to re-exec securely we need the absolute path of the
591 * executable. On Solaris getexecname(3c) may not return an absolute
592 * path so we use dladdr to get the filename of the executable and
593 * then use realpath to derive an absolute path. From Solaris 9
594 * onwards the filename returned in DL_info structure from dladdr is
595 * an absolute pathname so technically realpath isn't required.
596 * On Linux we read the executable name from /proc/self/exe.
597 * As a fallback, and for platforms other than Solaris and Linux,
598 * we use FindExecName to compute the executable name.
599 */
600const char*
601SetExecname(char **argv)
602{
603    char* exec_path = NULL;
604    {
605        Dl_info dlinfo;
606
607#ifdef STATIC_BUILD
608        void *fptr;
609        fptr = (void *)&SetExecname;
610#else
611        int (*fptr)();
612        fptr = (int (*)())dlsym(RTLD_DEFAULT, "main");
613#endif
614        if (fptr == NULL) {
615            JLI_ReportErrorMessage(DLL_ERROR3, dlerror());
616            return JNI_FALSE;
617        }
618
619        if (dladdr((void*)fptr, &dlinfo)) {
620            char *resolved = (char*)JLI_MemAlloc(PATH_MAX+1);
621            if (resolved != NULL) {
622                exec_path = realpath(dlinfo.dli_fname, resolved);
623                if (exec_path == NULL) {
624                    JLI_MemFree(resolved);
625                }
626            }
627        }
628    }
629    if (exec_path == NULL) {
630        exec_path = FindExecName(argv[0]);
631    }
632    execname = exec_path;
633    return exec_path;
634}
635
636/* --- Splash Screen shared library support --- */
637
638static JavaVM* SetJavaVMValue()
639{
640    JavaVM * jvm = NULL;
641
642    // The handle is good for both the launcher and the libosxapp.dylib
643    void * handle = dlopen(NULL, RTLD_LAZY | RTLD_GLOBAL);
644    if (handle) {
645        typedef JavaVM* (*JLI_GetJavaVMInstance_t)();
646
647        JLI_GetJavaVMInstance_t JLI_GetJavaVMInstance =
648            (JLI_GetJavaVMInstance_t)dlsym(handle,
649                    "JLI_GetJavaVMInstance");
650        if (JLI_GetJavaVMInstance) {
651            jvm = JLI_GetJavaVMInstance();
652        }
653
654        if (jvm) {
655            typedef void (*OSXAPP_SetJavaVM_t)(JavaVM*);
656
657            OSXAPP_SetJavaVM_t OSXAPP_SetJavaVM =
658                (OSXAPP_SetJavaVM_t)dlsym(handle, "OSXAPP_SetJavaVM");
659            if (OSXAPP_SetJavaVM) {
660                OSXAPP_SetJavaVM(jvm);
661            } else {
662                jvm = NULL;
663            }
664        }
665
666        dlclose(handle);
667    }
668
669    return jvm;
670}
671
672static const char* SPLASHSCREEN_SO = JNI_LIB_NAME("splashscreen");
673
674static void* hSplashLib = NULL;
675
676void* SplashProcAddress(const char* name) {
677    if (!hSplashLib) {
678        char jrePath[PATH_MAX];
679        if (!GetJREPath(jrePath, sizeof(jrePath), JNI_FALSE)) {
680            JLI_ReportErrorMessage(JRE_ERROR1);
681            return NULL;
682        }
683
684        char splashPath[PATH_MAX];
685        const int ret = JLI_Snprintf(splashPath, sizeof(splashPath),
686                "%s/lib/%s", jrePath, SPLASHSCREEN_SO);
687        if (ret >= (int)sizeof(splashPath)) {
688            JLI_ReportErrorMessage(JRE_ERROR11);
689            return NULL;
690        }
691        if (ret < 0) {
692            JLI_ReportErrorMessage(JRE_ERROR13);
693            return NULL;
694        }
695
696        hSplashLib = dlopen(splashPath, RTLD_LAZY | RTLD_GLOBAL);
697        // It's OK if dlopen() fails. The splash screen library binary file
698        // might have been stripped out from the JRE image to reduce its size
699        // (e.g. on embedded platforms).
700
701        if (hSplashLib) {
702            if (!SetJavaVMValue()) {
703                dlclose(hSplashLib);
704                hSplashLib = NULL;
705            }
706        }
707    }
708    if (hSplashLib) {
709        void* sym = dlsym(hSplashLib, name);
710        return sym;
711    } else {
712        return NULL;
713    }
714}
715
716/*
717 * Signature adapter for pthread_create().
718 */
719static void* ThreadJavaMain(void* args) {
720    return (void*)(intptr_t)JavaMain(args);
721}
722
723/*
724 * Block current thread and continue execution in a new thread.
725 */
726int
727CallJavaMainInNewThread(jlong stack_size, void* args) {
728    int rslt;
729    pthread_t tid;
730    pthread_attr_t attr;
731    pthread_attr_init(&attr);
732    pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
733
734    if (stack_size > 0) {
735        pthread_attr_setstacksize(&attr, stack_size);
736    }
737    pthread_attr_setguardsize(&attr, 0); // no pthread guard page on java threads
738
739    if (pthread_create(&tid, &attr, ThreadJavaMain, args) == 0) {
740        void* tmp;
741        pthread_join(tid, &tmp);
742        rslt = (int)(intptr_t)tmp;
743    } else {
744       /*
745        * Continue execution in current thread if for some reason (e.g. out of
746        * memory/LWP)  a new thread can't be created. This will likely fail
747        * later in JavaMain as JNI_CreateJavaVM needs to create quite a
748        * few new threads, anyway, just give it a try..
749        */
750        rslt = JavaMain(args);
751    }
752
753    pthread_attr_destroy(&attr);
754    return rslt;
755}
756
757static JavaVM* jvmInstance = NULL;
758static jboolean sameThread = JNI_FALSE; /* start VM in current thread */
759
760/*
761 * Note there is a callback on this function from the splashscreen logic,
762 * this as well SetJavaVMValue() needs to be simplified.
763 */
764JNIEXPORT JavaVM* JNICALL
765JLI_GetJavaVMInstance()
766{
767    return jvmInstance;
768}
769
770void
771RegisterThread()
772{
773    // stubbed out for windows and *nixes.
774}
775
776static void
777SetXDockArgForAWT(const char *arg)
778{
779    char envVar[80];
780    if (strstr(arg, "-Xdock:name=") == arg) {
781        /*
782         * The APP_NAME_<pid> environment variable is used to pass
783         * an application name as specified with the -Xdock:name command
784         * line option from Java launcher code to the AWT code in order
785         * to assign this name to the app's dock tile on the Mac.
786         * The _<pid> part is added to avoid collisions with child processes.
787         *
788         * WARNING: This environment variable is an implementation detail and
789         * isn't meant for use outside of the core platform. The mechanism for
790         * passing this information from Java launcher to other modules may
791         * change drastically between update release, and it may even be
792         * removed or replaced with another mechanism.
793         *
794         * NOTE: It is used by SWT, and JavaFX.
795         */
796        snprintf(envVar, sizeof(envVar), "APP_NAME_%d", getpid());
797        setenv(envVar, (arg + 12), 1);
798    }
799
800    if (strstr(arg, "-Xdock:icon=") == arg) {
801        /*
802         * The APP_ICON_<pid> environment variable is used to pass
803         * an application icon as specified with the -Xdock:icon command
804         * line option from Java launcher code to the AWT code in order
805         * to assign this icon to the app's dock tile on the Mac.
806         * The _<pid> part is added to avoid collisions with child processes.
807         *
808         * WARNING: This environment variable is an implementation detail and
809         * isn't meant for use outside of the core platform. The mechanism for
810         * passing this information from Java launcher to other modules may
811         * change drastically between update release, and it may even be
812         * removed or replaced with another mechanism.
813         *
814         * NOTE: It is used by SWT, and JavaFX.
815         */
816        snprintf(envVar, sizeof(envVar), "APP_ICON_%d", getpid());
817        setenv(envVar, (arg + 12), 1);
818    }
819}
820
821static void
822SetMainClassForAWT(JNIEnv *env, jclass mainClass) {
823    jclass classClass = NULL;
824    NULL_CHECK(classClass = FindBootStrapClass(env, "java/lang/Class"));
825
826    jmethodID getCanonicalNameMID = NULL;
827    NULL_CHECK(getCanonicalNameMID = (*env)->GetMethodID(env, classClass, "getCanonicalName", "()Ljava/lang/String;"));
828
829    jstring mainClassString = (*env)->CallObjectMethod(env, mainClass, getCanonicalNameMID);
830    if ((*env)->ExceptionCheck(env)) {
831        /*
832         * Clears all errors caused by getCanonicalName() on the mainclass and
833         * leaves the JAVA_MAIN_CLASS__<pid> empty.
834         */
835        (*env)->ExceptionClear(env);
836        return;
837    }
838
839    const char *mainClassName = NULL;
840    NULL_CHECK(mainClassName = (*env)->GetStringUTFChars(env, mainClassString, NULL));
841
842    char envVar[80];
843    /*
844     * The JAVA_MAIN_CLASS_<pid> environment variable is used to pass
845     * the name of a Java class whose main() method is invoked by
846     * the Java launcher code to start the application, to the AWT code
847     * in order to assign the name to the Apple menu bar when the app
848     * is active on the Mac.
849     * The _<pid> part is added to avoid collisions with child processes.
850     *
851     * WARNING: This environment variable is an implementation detail and
852     * isn't meant for use outside of the core platform. The mechanism for
853     * passing this information from Java launcher to other modules may
854     * change drastically between update release, and it may even be
855     * removed or replaced with another mechanism.
856     *
857     * NOTE: It is used by SWT, and JavaFX.
858     */
859    snprintf(envVar, sizeof(envVar), "JAVA_MAIN_CLASS_%d", getpid());
860    setenv(envVar, mainClassName, 1);
861
862    (*env)->ReleaseStringUTFChars(env, mainClassString, mainClassName);
863}
864
865void
866SetXStartOnFirstThreadArg()
867{
868    // XXX: BEGIN HACK
869    // short circuit hack for <https://bugs.eclipse.org/bugs/show_bug.cgi?id=211625>
870    // need a way to get AWT/Swing apps launched when spawned from Eclipse,
871    // which currently has no UI to not pass the -XstartOnFirstThread option
872    if (getenv("HACK_IGNORE_START_ON_FIRST_THREAD") != NULL) return;
873    // XXX: END HACK
874
875    sameThread = JNI_TRUE;
876    // Set a variable that tells us we started on the main thread.
877    // This is used by the AWT during startup. (See LWCToolkit.m)
878    char envVar[80];
879    snprintf(envVar, sizeof(envVar), "JAVA_STARTED_ON_FIRST_THREAD_%d", getpid());
880    setenv(envVar, "1", 1);
881}
882
883// MacOSX we may continue in the same thread
884int
885JVMInit(InvocationFunctions* ifn, jlong threadStackSize,
886                 int argc, char **argv,
887                 int mode, char *what, int ret) {
888    if (sameThread) {
889        JLI_TraceLauncher("In same thread\n");
890        // need to block this thread against the main thread
891        // so signals get caught correctly
892        __block int rslt = 0;
893        NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
894        {
895            NSBlockOperation *op = [NSBlockOperation blockOperationWithBlock: ^{
896                JavaMainArgs args;
897                args.argc = argc;
898                args.argv = argv;
899                args.mode = mode;
900                args.what = what;
901                args.ifn  = *ifn;
902                rslt = JavaMain(&args);
903            }];
904
905            /*
906             * We cannot use dispatch_sync here, because it blocks the main dispatch queue.
907             * Using the main NSRunLoop allows the dispatch queue to run properly once
908             * SWT (or whatever toolkit this is needed for) kicks off it's own NSRunLoop
909             * and starts running.
910             */
911            [op performSelectorOnMainThread:@selector(start) withObject:nil waitUntilDone:YES];
912        }
913        [pool drain];
914        return rslt;
915    } else {
916        return ContinueInNewThread(ifn, threadStackSize, argc, argv, mode, what, ret);
917    }
918}
919
920/*
921 * Note the jvmInstance must be initialized first before entering into
922 * ShowSplashScreen, as there is a callback into the JLI_GetJavaVMInstance.
923 */
924void PostJVMInit(JNIEnv *env, jclass mainClass, JavaVM *vm) {
925    jvmInstance = vm;
926    SetMainClassForAWT(env, mainClass);
927    CHECK_EXCEPTION_RETURN();
928    ShowSplashScreen();
929}
930
931jboolean
932ProcessPlatformOption(const char* arg)
933{
934    if (JLI_StrCmp(arg, "-XstartOnFirstThread") == 0) {
935       SetXStartOnFirstThreadArg();
936       return JNI_TRUE;
937    } else if (JLI_StrCCmp(arg, "-Xdock:") == 0) {
938       SetXDockArgForAWT(arg);
939       return JNI_TRUE;
940    }
941    // arguments we know not
942    return JNI_FALSE;
943}
944