1 /*
2 * Copyright (c) 1998, 2018, 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 "manifest_info.h"
39
40
41 #define JVM_DLL "libjvm.so"
42 #define JAVA_DLL "libjava.so"
43 #ifdef AIX
44 #define LD_LIBRARY_PATH "LIBPATH"
45 #else
46 #define LD_LIBRARY_PATH "LD_LIBRARY_PATH"
47 #endif
48
49 /* help jettison the LD_LIBRARY_PATH settings in the future */
50 #ifndef SETENV_REQUIRED
51 #define SETENV_REQUIRED
52 #endif
53
54 #ifdef __solaris__
55 # include <sys/systeminfo.h>
56 # include <sys/elf.h>
57 # include <stdio.h>
58 #endif
59
60 /*
61 * Flowchart of launcher execs and options processing on unix
62 *
63 * The selection of the proper vm shared library to open depends on
64 * several classes of command line options, including vm "flavor"
65 * options (-client, -server).
66 * The vm selection options are not passed to the running
67 * virtual machine; they must be screened out by the launcher.
68 *
69 * The version specification (if any) is processed first by the
70 * platform independent routine SelectVersion. This may result in
71 * the exec of the specified launcher version.
72 *
73 * Previously the launcher modified the LD_LIBRARY_PATH appropriately for the
74 * desired data model path, regardless if data models matched or not. The
75 * launcher subsequently exec'ed the desired executable, in order to make the
76 * LD_LIBRARY_PATH path available, for the runtime linker.
77 *
78 * Now, in most cases,the launcher will dlopen the target libjvm.so. All
79 * required libraries are loaded by the runtime linker, using the
80 * $RPATH/$ORIGIN baked into the shared libraries at compile time. Therefore,
81 * in most cases, the launcher will only exec, if the data models are
82 * mismatched, and will not set any environment variables, regardless of the
83 * data models.
84 *
85 * However, if the environment contains a LD_LIBRARY_PATH, this will cause the
86 * launcher to inspect the LD_LIBRARY_PATH. The launcher will check
87 * a. if the LD_LIBRARY_PATH's first component is the path to the desired
88 * libjvm.so
89 * b. if any other libjvm.so is found in any of the paths.
90 * If case b is true, then the launcher will set the LD_LIBRARY_PATH to the
91 * desired JRE and reexec, in order to propagate the environment.
92 *
93 * Main
94 * (incoming argv)
95 * |
96 * \|/
97 * CreateExecutionEnvironment
98 * (determines desired data model)
99 * |
100 * |
101 * \|/
102 * Have Desired Model ? --> NO --> Exit(with error)
103 * |
104 * |
105 * \|/
106 * YES
107 * |
108 * |
109 * \|/
110 * CheckJvmType
111 * (removes -client, -server, etc.)
112 * |
113 * |
114 * \|/
115 * TranslateDashJArgs...
116 * (Prepare to pass args to vm)
117 * |
118 * |
119 * \|/
120 * ParseArguments
121 * |
122 * |
123 * \|/
124 * RequiresSetenv
125 * Is LD_LIBRARY_PATH
126 * and friends set ? --> NO --> Continue
127 * YES
128 * |
129 * |
130 * \|/
131 * Path is desired JRE ? YES --> Continue
132 * NO
133 * |
134 * |
135 * \|/
136 * Paths have well known
137 * jvm paths ? --> NO --> Error/Exit
138 * YES
139 * |
140 * |
141 * \|/
142 * Does libjvm.so exist
143 * in any of them ? --> NO --> Continue
144 * YES
145 * |
146 * |
147 * \|/
148 * Set the LD_LIBRARY_PATH
149 * |
150 * |
151 * \|/
152 * Re-exec
153 * |
154 * |
155 * \|/
156 * Main
157 */
158
159 /* Store the name of the executable once computed */
160 static char *execname = NULL;
161
162 /*
163 * execname accessor from other parts of platform dependent logic
164 */
165 const char *
166 GetExecName() {
167 return execname;
168 }
169
170 #ifdef SETENV_REQUIRED
171 static jboolean
172 JvmExists(const char *path) {
173 char tmp[PATH_MAX + 1];
174 struct stat statbuf;
175 JLI_Snprintf(tmp, PATH_MAX, "%s/%s", path, JVM_DLL);
176 if (stat(tmp, &statbuf) == 0) {
177 return JNI_TRUE;
178 }
179 return JNI_FALSE;
180 }
181 /*
182 * contains a lib/{server,client}/libjvm.so ?
183 */
184 static jboolean
185 ContainsLibJVM(const char *env) {
186 /* the usual suspects */
187 char clientPattern[] = "lib/client";
188 char serverPattern[] = "lib/server";
189 char *envpath;
190 char *path;
191 jboolean clientPatternFound;
192 jboolean serverPatternFound;
193
194 /* fastest path */
195 if (env == NULL) {
196 return JNI_FALSE;
197 }
198
199 /* to optimize for time, test if any of our usual suspects are present. */
200 clientPatternFound = JLI_StrStr(env, clientPattern) != NULL;
201 serverPatternFound = JLI_StrStr(env, serverPattern) != NULL;
202 if (clientPatternFound == JNI_FALSE && serverPatternFound == JNI_FALSE) {
203 return JNI_FALSE;
204 }
205
206 /*
207 * we have a suspicious path component, check if it contains a libjvm.so
208 */
209 envpath = JLI_StringDup(env);
210 for (path = JLI_StrTok(envpath, ":"); path != NULL; path = JLI_StrTok(NULL, ":")) {
211 if (clientPatternFound && JLI_StrStr(path, clientPattern) != NULL) {
212 if (JvmExists(path)) {
213 JLI_MemFree(envpath);
214 return JNI_TRUE;
215 }
216 }
217 if (serverPatternFound && JLI_StrStr(path, serverPattern) != NULL) {
218 if (JvmExists(path)) {
219 JLI_MemFree(envpath);
220 return JNI_TRUE;
221 }
222 }
223 }
224 JLI_MemFree(envpath);
225 return JNI_FALSE;
226 }
227
228 /*
229 * Test whether the environment variable needs to be set, see flowchart.
230 */
231 static jboolean
232 RequiresSetenv(const char *jvmpath) {
233 char jpath[PATH_MAX + 1];
234 char *llp;
235 char *dmllp = NULL;
236 char *p; /* a utility pointer */
237
238 #ifdef AIX
239 /* We always have to set the LIBPATH on AIX because ld doesn't support $ORIGIN. */
240 return JNI_TRUE;
241 #endif
242
243 llp = getenv("LD_LIBRARY_PATH");
244 #ifdef __solaris__
245 dmllp = getenv("LD_LIBRARY_PATH_64");
246 #endif /* __solaris__ */
247 /* no environment variable is a good environment variable */
248 if (llp == NULL && dmllp == NULL) {
249 return JNI_FALSE;
250 }
251 #ifdef __linux
252 /*
253 * On linux, if a binary is running as sgid or suid, glibc sets
254 * LD_LIBRARY_PATH to the empty string for security purposes. (In contrast,
255 * on Solaris the LD_LIBRARY_PATH variable for a privileged binary does not
256 * lose its settings; but the dynamic linker does apply more scrutiny to the
257 * path.) The launcher uses the value of LD_LIBRARY_PATH to prevent an exec
258 * loop, here and further downstream. Therefore, if we are running sgid or
259 * suid, this function's setting of LD_LIBRARY_PATH will be ineffective and
260 * we should case a return from the calling function. Getting the right
261 * libraries will be handled by the RPATH. In reality, this check is
262 * redundant, as the previous check for a non-null LD_LIBRARY_PATH will
263 * return back to the calling function forthwith, it is left here to safe
264 * guard against any changes, in the glibc's existing security policy.
265 */
266 if ((getgid() != getegid()) || (getuid() != geteuid())) {
267 return JNI_FALSE;
268 }
269 #endif /* __linux */
270
271 /*
272 * Prevent recursions. Since LD_LIBRARY_PATH is the one which will be set by
273 * previous versions of the JRE, thus it is the only path that matters here.
274 * So we check to see if the desired JRE is set.
275 */
276 JLI_StrNCpy(jpath, jvmpath, PATH_MAX);
277 p = JLI_StrRChr(jpath, '/');
278 *p = '\0';
279 if (llp != NULL && JLI_StrNCmp(llp, jpath, JLI_StrLen(jpath)) == 0) {
280 return JNI_FALSE;
281 }
282
283 /* scrutinize all the paths further */
284 if (llp != NULL && ContainsLibJVM(llp)) {
285 return JNI_TRUE;
286 }
287 if (dmllp != NULL && ContainsLibJVM(dmllp)) {
288 return JNI_TRUE;
289 }
290 return JNI_FALSE;
291 }
292 #endif /* SETENV_REQUIRED */
293
294 void
295 CreateExecutionEnvironment(int *pargc, char ***pargv,
296 char jrepath[], jint so_jrepath,
297 char jvmpath[], jint so_jvmpath,
298 char jvmcfg[], jint so_jvmcfg) {
299
300 char * jvmtype = NULL;
301 int argc = *pargc;
302 char **argv = *pargv;
303
304 #ifdef SETENV_REQUIRED
305 jboolean mustsetenv = JNI_FALSE;
306 char *runpath = NULL; /* existing effective LD_LIBRARY_PATH setting */
307 char* new_runpath = NULL; /* desired new LD_LIBRARY_PATH string */
308 char* newpath = NULL; /* path on new LD_LIBRARY_PATH */
309 char* lastslash = NULL;
310 char** newenvp = NULL; /* current environment */
311 size_t new_runpath_size;
312 #endif /* SETENV_REQUIRED */
313
314 /* Compute/set the name of the executable */
315 SetExecname(*pargv);
316
317 /* Check to see if the jvmpath exists */
318 /* Find out where the JRE is that we will be using. */
319 if (!GetJREPath(jrepath, so_jrepath, JNI_FALSE)) {
320 JLI_ReportErrorMessage(JRE_ERROR1);
321 exit(2);
322 }
323 JLI_Snprintf(jvmcfg, so_jvmcfg, "%s%slib%sjvm.cfg",
324 jrepath, FILESEP, FILESEP);
325 /* Find the specified JVM type */
326 if (ReadKnownVMs(jvmcfg, JNI_FALSE) < 1) {
327 JLI_ReportErrorMessage(CFG_ERROR7);
328 exit(1);
329 }
330
331 jvmpath[0] = '\0';
332 jvmtype = CheckJvmType(pargc, pargv, JNI_FALSE);
333 if (JLI_StrCmp(jvmtype, "ERROR") == 0) {
334 JLI_ReportErrorMessage(CFG_ERROR9);
335 exit(4);
336 }
337
338 if (!GetJVMPath(jrepath, jvmtype, jvmpath, so_jvmpath)) {
339 JLI_ReportErrorMessage(CFG_ERROR8, jvmtype, jvmpath);
340 exit(4);
341 }
342 /*
343 * we seem to have everything we need, so without further ado
344 * we return back, otherwise proceed to set the environment.
345 */
346 #ifdef SETENV_REQUIRED
347 mustsetenv = RequiresSetenv(jvmpath);
348 JLI_TraceLauncher("mustsetenv: %s\n", mustsetenv ? "TRUE" : "FALSE");
349
350 if (mustsetenv == JNI_FALSE) {
351 return;
352 }
353 #else
354 return;
355 #endif /* SETENV_REQUIRED */
356
357 #ifdef SETENV_REQUIRED
358 if (mustsetenv) {
359 /*
360 * We will set the LD_LIBRARY_PATH as follows:
361 *
362 * o $JVMPATH (directory portion only)
363 * o $JRE/lib
364 * o $JRE/../lib
365 *
366 * followed by the user's previous effective LD_LIBRARY_PATH, if
367 * any.
368 */
369
370 runpath = getenv(LD_LIBRARY_PATH);
371
372 /* runpath contains current effective LD_LIBRARY_PATH setting */
373 { /* New scope to declare local variable */
374 char *new_jvmpath = JLI_StringDup(jvmpath);
375 new_runpath_size = ((runpath != NULL) ? JLI_StrLen(runpath) : 0) +
376 2 * JLI_StrLen(jrepath) +
377 #ifdef AIX
378 /* On AIX we additionally need 'jli' in the path because ld doesn't support $ORIGIN. */
379 JLI_StrLen(jrepath) + JLI_StrLen("/lib//jli:") +
380 #endif
381 JLI_StrLen(new_jvmpath) + 52;
382 new_runpath = JLI_MemAlloc(new_runpath_size);
383 newpath = new_runpath + JLI_StrLen(LD_LIBRARY_PATH "=");
384
385
386 /*
387 * Create desired LD_LIBRARY_PATH value for target data model.
388 */
389 {
390 /* remove the name of the .so from the JVM path */
391 lastslash = JLI_StrRChr(new_jvmpath, '/');
392 if (lastslash)
393 *lastslash = '\0';
394
395 sprintf(new_runpath, LD_LIBRARY_PATH "="
396 "%s:"
397 "%s/lib:"
398 #ifdef AIX
399 "%s/lib/jli:" /* Needed on AIX because ld doesn't support $ORIGIN. */
400 #endif
401 "%s/../lib",
402 new_jvmpath,
403 jrepath,
404 #ifdef AIX
405 jrepath,
406 #endif
407 jrepath
408 );
409
410 JLI_MemFree(new_jvmpath);
411
412 /*
413 * Check to make sure that the prefix of the current path is the
414 * desired environment variable setting, though the RequiresSetenv
415 * checks if the desired runpath exists, this logic does a more
416 * comprehensive check.
417 */
418 if (runpath != NULL &&
419 JLI_StrNCmp(newpath, runpath, JLI_StrLen(newpath)) == 0 &&
420 (runpath[JLI_StrLen(newpath)] == 0 ||
421 runpath[JLI_StrLen(newpath)] == ':')) {
422 JLI_MemFree(new_runpath);
423 return;
424 }
425 }
426 }
427
428 /*
429 * Place the desired environment setting onto the prefix of
430 * LD_LIBRARY_PATH. Note that this prevents any possible infinite
431 * loop of execv() because we test for the prefix, above.
432 */
433 if (runpath != 0) {
434 /* ensure storage for runpath + colon + NULL */
435 if ((JLI_StrLen(runpath) + 1 + 1) > new_runpath_size) {
436 JLI_ReportErrorMessageSys(JRE_ERROR11);
437 exit(1);
438 }
439 JLI_StrCat(new_runpath, ":");
440 JLI_StrCat(new_runpath, runpath);
441 }
442
443 if (putenv(new_runpath) != 0) {
444 /* problem allocating memory; LD_LIBRARY_PATH not set properly */
445 exit(1);
446 }
447
448 /*
449 * Unix systems document that they look at LD_LIBRARY_PATH only
450 * once at startup, so we have to re-exec the current executable
451 * to get the changed environment variable to have an effect.
452 */
453
454 newenvp = environ;
455 }
456 #endif /* SETENV_REQUIRED */
457 {
458 char *newexec = execname;
459 JLI_TraceLauncher("TRACER_MARKER:About to EXEC\n");
460 (void) fflush(stdout);
461 (void) fflush(stderr);
462 #ifdef SETENV_REQUIRED
463 if (mustsetenv) {
464 execve(newexec, argv, newenvp);
465 } else {
466 execv(newexec, argv);
467 }
468 #else /* !SETENV_REQUIRED */
469 execv(newexec, argv);
470 #endif /* SETENV_REQUIRED */
471 JLI_ReportErrorMessageSys(JRE_ERROR4, newexec);
472 }
473 exit(1);
474 }
475
476
477 static jboolean
478 GetJVMPath(const char *jrepath, const char *jvmtype,
479 char *jvmpath, jint jvmpathsize)
480 {
481 struct stat s;
482
483 if (JLI_StrChr(jvmtype, '/')) {
484 JLI_Snprintf(jvmpath, jvmpathsize, "%s/" JVM_DLL, jvmtype);
485 } else {
486 JLI_Snprintf(jvmpath, jvmpathsize, "%s/lib/%s/" JVM_DLL, jrepath, jvmtype);
487 }
488
489 JLI_TraceLauncher("Does `%s' exist ... ", jvmpath);
490
491 if (stat(jvmpath, &s) == 0) {
492 JLI_TraceLauncher("yes.\n");
493 return JNI_TRUE;
494 } else {
495 JLI_TraceLauncher("no.\n");
496 return JNI_FALSE;
497 }
498 }
499
500 /*
501 * Find path to JRE based on .exe's location or registry settings.
502 */
503 static jboolean
504 GetJREPath(char *path, jint pathsize, jboolean speculative)
505 {
506 char libjava[MAXPATHLEN];
507 struct stat s;
508
509 if (GetApplicationHome(path, pathsize)) {
510 /* Is JRE co-located with the application? */
511 JLI_Snprintf(libjava, sizeof(libjava), "%s/lib/" JAVA_DLL, path);
512 if (access(libjava, F_OK) == 0) {
513 JLI_TraceLauncher("JRE path is %s\n", path);
514 return JNI_TRUE;
515 }
516 /* ensure storage for path + /jre + NULL */
517 if ((JLI_StrLen(path) + 4 + 1) > (size_t) pathsize) {
518 JLI_TraceLauncher("Insufficient space to store JRE path\n");
519 return JNI_FALSE;
520 }
521 /* Does the app ship a private JRE in <apphome>/jre directory? */
522 JLI_Snprintf(libjava, sizeof(libjava), "%s/jre/lib/" JAVA_DLL, path);
523 if (access(libjava, F_OK) == 0) {
524 JLI_StrCat(path, "/jre");
525 JLI_TraceLauncher("JRE path is %s\n", path);
526 return JNI_TRUE;
527 }
528 }
529
530 if (GetApplicationHomeFromDll(path, pathsize)) {
531 JLI_Snprintf(libjava, sizeof(libjava), "%s/lib/" JAVA_DLL, path);
532 if (stat(libjava, &s) == 0) {
533 JLI_TraceLauncher("JRE path is %s\n", path);
534 return JNI_TRUE;
535 }
536 }
537
538 if (!speculative)
539 JLI_ReportErrorMessage(JRE_ERROR8 JAVA_DLL);
540 return JNI_FALSE;
541 }
542
543 jboolean
544 LoadJavaVM(const char *jvmpath, InvocationFunctions *ifn)
545 {
546 void *libjvm;
547
548 JLI_TraceLauncher("JVM path is %s\n", jvmpath);
549
550 libjvm = dlopen(jvmpath, RTLD_NOW + RTLD_GLOBAL);
551 if (libjvm == NULL) {
552 #if defined(__solaris__) && defined(__sparc) && !defined(_LP64) /* i.e. 32-bit sparc */
553 FILE * fp;
554 Elf32_Ehdr elf_head;
555 int count;
556 int location;
557
558 fp = fopen(jvmpath, "r");
559 if (fp == NULL) {
560 JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
561 return JNI_FALSE;
562 }
563
564 /* read in elf header */
565 count = fread((void*)(&elf_head), sizeof(Elf32_Ehdr), 1, fp);
566 fclose(fp);
567 if (count < 1) {
568 JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
569 return JNI_FALSE;
570 }
571
572 /*
573 * Check for running a server vm (compiled with -xarch=v8plus)
574 * on a stock v8 processor. In this case, the machine type in
575 * the elf header would not be included the architecture list
576 * provided by the isalist command, which is turn is gotten from
577 * sysinfo. This case cannot occur on 64-bit hardware and thus
578 * does not have to be checked for in binaries with an LP64 data
579 * model.
580 */
581 if (elf_head.e_machine == EM_SPARC32PLUS) {
582 char buf[257]; /* recommended buffer size from sysinfo man
583 page */
584 long length;
585 char* location;
586
587 length = sysinfo(SI_ISALIST, buf, 257);
588 if (length > 0) {
589 location = JLI_StrStr(buf, "sparcv8plus ");
590 if (location == NULL) {
591 JLI_ReportErrorMessage(JVM_ERROR3);
592 return JNI_FALSE;
593 }
594 }
595 }
596 #endif
597 JLI_ReportErrorMessage(DLL_ERROR1, __LINE__);
598 JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
599 return JNI_FALSE;
600 }
601
602 ifn->CreateJavaVM = (CreateJavaVM_t)
603 dlsym(libjvm, "JNI_CreateJavaVM");
604 if (ifn->CreateJavaVM == NULL) {
605 JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
606 return JNI_FALSE;
607 }
608
609 ifn->GetDefaultJavaVMInitArgs = (GetDefaultJavaVMInitArgs_t)
610 dlsym(libjvm, "JNI_GetDefaultJavaVMInitArgs");
611 if (ifn->GetDefaultJavaVMInitArgs == NULL) {
612 JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
613 return JNI_FALSE;
614 }
615
616 ifn->GetCreatedJavaVMs = (GetCreatedJavaVMs_t)
617 dlsym(libjvm, "JNI_GetCreatedJavaVMs");
618 if (ifn->GetCreatedJavaVMs == NULL) {
619 JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
620 return JNI_FALSE;
621 }
622
623 return JNI_TRUE;
624 }
625
626 /*
627 * Compute the name of the executable
628 *
629 * In order to re-exec securely we need the absolute path of the
630 * executable. On Solaris getexecname(3c) may not return an absolute
631 * path so we use dladdr to get the filename of the executable and
632 * then use realpath to derive an absolute path. From Solaris 9
633 * onwards the filename returned in DL_info structure from dladdr is
634 * an absolute pathname so technically realpath isn't required.
635 * On Linux we read the executable name from /proc/self/exe.
636 * As a fallback, and for platforms other than Solaris and Linux,
637 * we use FindExecName to compute the executable name.
638 */
639 const char*
640 SetExecname(char **argv)
641 {
642 char* exec_path = NULL;
643 #if defined(__solaris__)
644 {
645 Dl_info dlinfo;
646 int (*fptr)();
647
648 fptr = (int (*)())dlsym(RTLD_DEFAULT, "main");
649 if (fptr == NULL) {
650 JLI_ReportErrorMessage(DLL_ERROR3, dlerror());
651 return JNI_FALSE;
652 }
653
654 if (dladdr((void*)fptr, &dlinfo)) {
655 char *resolved = (char*)JLI_MemAlloc(PATH_MAX+1);
656 if (resolved != NULL) {
657 exec_path = realpath(dlinfo.dli_fname, resolved);
658 if (exec_path == NULL) {
659 JLI_MemFree(resolved);
660 }
661 }
662 }
663 }
664 #elif defined(__linux__)
665 {
666 const char* self = "/proc/self/exe";
667 char buf[PATH_MAX+1];
668 int len = readlink(self, buf, PATH_MAX);
669 if (len >= 0) {
670 buf[len] = '\0'; /* readlink(2) doesn't NUL terminate */
671 exec_path = JLI_StringDup(buf);
672 }
673 }
674 #else /* !__solaris__ && !__linux__ */
675 {
676 /* Not implemented */
677 }
678 #endif
679
680 if (exec_path == NULL) {
681 exec_path = FindExecName(argv[0]);
682 }
683 execname = exec_path;
684 return exec_path;
685 }
686
687 /* --- Splash Screen shared library support --- */
688 static const char* SPLASHSCREEN_SO = JNI_LIB_NAME("splashscreen");
689 static void* hSplashLib = NULL;
690
691 void* SplashProcAddress(const char* name) {
692 if (!hSplashLib) {
693 int ret;
694 char jrePath[MAXPATHLEN];
695 char splashPath[MAXPATHLEN];
696
697 if (!GetJREPath(jrePath, sizeof(jrePath), JNI_FALSE)) {
698 JLI_ReportErrorMessage(JRE_ERROR1);
699 return NULL;
700 }
701 ret = JLI_Snprintf(splashPath, sizeof(splashPath), "%s/lib/%s",
702 jrePath, SPLASHSCREEN_SO);
703
704 if (ret >= (int) sizeof(splashPath)) {
705 JLI_ReportErrorMessage(JRE_ERROR11);
706 return NULL;
707 }
708 if (ret < 0) {
709 JLI_ReportErrorMessage(JRE_ERROR13);
710 return NULL;
711 }
712 hSplashLib = dlopen(splashPath, RTLD_LAZY | RTLD_GLOBAL);
713 JLI_TraceLauncher("Info: loaded %s\n", splashPath);
714 }
715 if (hSplashLib) {
716 void* sym = dlsym(hSplashLib, name);
717 return sym;
718 } else {
719 return NULL;
720 }
721 }
722
723 void SplashFreeLibrary() {
724 if (hSplashLib) {
725 dlclose(hSplashLib);
726 hSplashLib = NULL;
727 }
728 }
729
730 /*
731 * Block current thread and continue execution in a new thread
732 */
733 int
734 ContinueInNewThread0(int (JNICALL *continuation)(void *), jlong stack_size, void * args) {
735 int rslt;
736 #ifndef __solaris__
737 pthread_t tid;
738 pthread_attr_t attr;
739 pthread_attr_init(&attr);
740 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
741
742 if (stack_size > 0) {
743 pthread_attr_setstacksize(&attr, stack_size);
744 }
745 pthread_attr_setguardsize(&attr, 0); // no pthread guard page on java threads
746
747 if (pthread_create(&tid, &attr, (void *(*)(void*))(void*)continuation, (void*)args) == 0) {
748 void * tmp;
749 pthread_join(tid, &tmp);
750 rslt = (int)(intptr_t)tmp;
751 } else {
752 /*
753 * Continue execution in current thread if for some reason (e.g. out of
754 * memory/LWP) a new thread can't be created. This will likely fail
755 * later in continuation as JNI_CreateJavaVM needs to create quite a
756 * few new threads, anyway, just give it a try..
757 */
758 rslt = continuation(args);
759 }
760
761 pthread_attr_destroy(&attr);
762 #else /* __solaris__ */
763 thread_t tid;
764 long flags = 0;
765 if (thr_create(NULL, stack_size, (void *(*)(void *))(void*)continuation, args, flags, &tid) == 0) {
766 void * tmp;
767 thr_join(tid, NULL, &tmp);
768 rslt = (int)(intptr_t)tmp;
769 } else {
770 /* See above. Continue in current thread if thr_create() failed */
771 rslt = continuation(args);
772 }
773 #endif /* !__solaris__ */
774 return rslt;
775 }
776
777 /* Coarse estimation of number of digits assuming the worst case is a 64-bit pid. */
778 #define MAX_PID_STR_SZ 20
779
780 void SetJavaLauncherPlatformProps() {
781 /* Linux only */
782 #ifdef __linux__
783 const char *substr = "-Dsun.java.launcher.pid=";
784 char *pid_prop_str = (char *)JLI_MemAlloc(JLI_StrLen(substr) + MAX_PID_STR_SZ + 1);
785 sprintf(pid_prop_str, "%s%d", substr, getpid());
786 AddOption(pid_prop_str, NULL);
787 #endif /* __linux__ */
788 }
789
790 int
791 JVMInit(InvocationFunctions* ifn, jlong threadStackSize,
792 int argc, char **argv,
793 int mode, char *what, int ret)
794 {
795 ShowSplashScreen();
796 return ContinueInNewThread(ifn, threadStackSize, argc, argv, mode, what, ret);
797 }
798
799 void
800 PostJVMInit(JNIEnv *env, jclass mainClass, JavaVM *vm)
801 {
802 // stubbed out for windows and *nixes.
803 }
804
805 void
806 RegisterThread()
807 {
808 // stubbed out for windows and *nixes.
809 }
810
811 /*
812 * on unix, we return a false to indicate this option is not applicable
813 */
814 jboolean
815 ProcessPlatformOption(const char *arg)
816 {
817 return JNI_FALSE;
818 }