1 /* 2 * Copyright (c) 1998, 2019, 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 #ifdef __solaris__ 307 char *llp64 = NULL; /* existing LD_LIBRARY_PATH_64 setting */ 308 #endif // __solaris__ 309 char *runpath = NULL; /* existing effective LD_LIBRARY_PATH setting */ 310 char* new_runpath = NULL; /* desired new LD_LIBRARY_PATH string */ 311 char* newpath = NULL; /* path on new LD_LIBRARY_PATH */ 312 char* lastslash = NULL; 313 char** newenvp = NULL; /* current environment */ 314 size_t new_runpath_size; 315 #endif /* SETENV_REQUIRED */ 316 317 /* Compute/set the name of the executable */ 318 SetExecname(*pargv); 319 320 /* Check to see if the jvmpath exists */ 321 /* Find out where the JRE is that we will be using. */ 322 if (!GetJREPath(jrepath, so_jrepath, JNI_FALSE)) { 323 JLI_ReportErrorMessage(JRE_ERROR1); 324 exit(2); 325 } 326 JLI_Snprintf(jvmcfg, so_jvmcfg, "%s%slib%sjvm.cfg", 327 jrepath, FILESEP, FILESEP); 328 /* Find the specified JVM type */ 329 if (ReadKnownVMs(jvmcfg, JNI_FALSE) < 1) { 330 JLI_ReportErrorMessage(CFG_ERROR7); 331 exit(1); 332 } 333 334 jvmpath[0] = '\0'; 335 jvmtype = CheckJvmType(pargc, pargv, JNI_FALSE); 336 if (JLI_StrCmp(jvmtype, "ERROR") == 0) { 337 JLI_ReportErrorMessage(CFG_ERROR9); 338 exit(4); 339 } 340 341 if (!GetJVMPath(jrepath, jvmtype, jvmpath, so_jvmpath)) { 342 JLI_ReportErrorMessage(CFG_ERROR8, jvmtype, jvmpath); 343 exit(4); 344 } 345 /* 346 * we seem to have everything we need, so without further ado 347 * we return back, otherwise proceed to set the environment. 348 */ 349 #ifdef SETENV_REQUIRED 350 mustsetenv = RequiresSetenv(jvmpath); 351 JLI_TraceLauncher("mustsetenv: %s\n", mustsetenv ? "TRUE" : "FALSE"); 352 353 if (mustsetenv == JNI_FALSE) { 354 return; 355 } 356 #else 357 return; 358 #endif /* SETENV_REQUIRED */ 359 360 #ifdef SETENV_REQUIRED 361 if (mustsetenv) { 362 /* 363 * We will set the LD_LIBRARY_PATH as follows: 364 * 365 * o $JVMPATH (directory portion only) 366 * o $JRE/lib 367 * o $JRE/../lib 368 * 369 * followed by the user's previous effective LD_LIBRARY_PATH, if 370 * any. 371 */ 372 373 #ifdef __solaris__ 374 llp64 = getenv("LD_LIBRARY_PATH_64"); 375 runpath = (llp64 == NULL) ? getenv(LD_LIBRARY_PATH) : llp64; 376 #else 377 runpath = getenv(LD_LIBRARY_PATH); 378 #endif /* __solaris__ */ 379 380 /* runpath contains current effective LD_LIBRARY_PATH setting */ 381 { /* New scope to declare local variable */ 382 char *new_jvmpath = JLI_StringDup(jvmpath); 383 new_runpath_size = ((runpath != NULL) ? JLI_StrLen(runpath) : 0) + 384 2 * JLI_StrLen(jrepath) + 385 JLI_StrLen(new_jvmpath) + 52; 386 new_runpath = JLI_MemAlloc(new_runpath_size); 387 newpath = new_runpath + JLI_StrLen(LD_LIBRARY_PATH "="); 388 389 390 /* 391 * Create desired LD_LIBRARY_PATH value for target data model. 392 */ 393 { 394 /* remove the name of the .so from the JVM path */ 395 lastslash = JLI_StrRChr(new_jvmpath, '/'); 396 if (lastslash) 397 *lastslash = '\0'; 398 399 sprintf(new_runpath, LD_LIBRARY_PATH "=" 400 "%s:" 401 "%s/lib:" 402 "%s/../lib", 403 new_jvmpath, 404 jrepath, 405 jrepath 406 ); 407 408 JLI_MemFree(new_jvmpath); 409 410 /* 411 * Check to make sure that the prefix of the current path is the 412 * desired environment variable setting, though the RequiresSetenv 413 * checks if the desired runpath exists, this logic does a more 414 * comprehensive check. 415 */ 416 if (runpath != NULL && 417 JLI_StrNCmp(newpath, runpath, JLI_StrLen(newpath)) == 0 && 418 (runpath[JLI_StrLen(newpath)] == 0 || 419 runpath[JLI_StrLen(newpath)] == ':')) { 420 JLI_MemFree(new_runpath); 421 return; 422 } 423 } 424 } 425 426 /* 427 * Place the desired environment setting onto the prefix of 428 * LD_LIBRARY_PATH. Note that this prevents any possible infinite 429 * loop of execv() because we test for the prefix, above. 430 */ 431 if (runpath != 0) { 432 /* ensure storage for runpath + colon + NULL */ 433 if ((JLI_StrLen(runpath) + 1 + 1) > new_runpath_size) { 434 JLI_ReportErrorMessageSys(JRE_ERROR11); 435 exit(1); 436 } 437 JLI_StrCat(new_runpath, ":"); 438 JLI_StrCat(new_runpath, runpath); 439 } 440 441 if (putenv(new_runpath) != 0) { 442 /* problem allocating memory; LD_LIBRARY_PATH not set properly */ 443 exit(1); 444 } 445 446 /* 447 * Unix systems document that they look at LD_LIBRARY_PATH only 448 * once at startup, so we have to re-exec the current executable 449 * to get the changed environment variable to have an effect. 450 */ 451 #ifdef __solaris__ 452 /* 453 * new LD_LIBRARY_PATH took over for LD_LIBRARY_PATH_64 454 */ 455 if (llp64 != NULL) { 456 UnsetEnv("LD_LIBRARY_PATH_64"); 457 } 458 #endif // __solaris__ 459 460 newenvp = environ; 461 } 462 #endif /* SETENV_REQUIRED */ 463 { 464 char *newexec = execname; 465 JLI_TraceLauncher("TRACER_MARKER:About to EXEC\n"); 466 (void) fflush(stdout); 467 (void) fflush(stderr); 468 #ifdef SETENV_REQUIRED 469 if (mustsetenv) { 470 execve(newexec, argv, newenvp); 471 } else { 472 execv(newexec, argv); 473 } 474 #else /* !SETENV_REQUIRED */ 475 execv(newexec, argv); 476 #endif /* SETENV_REQUIRED */ 477 JLI_ReportErrorMessageSys(JRE_ERROR4, newexec); 478 } 479 exit(1); 480 } 481 482 483 static jboolean 484 GetJVMPath(const char *jrepath, const char *jvmtype, 485 char *jvmpath, jint jvmpathsize) 486 { 487 struct stat s; 488 489 if (JLI_StrChr(jvmtype, '/')) { 490 JLI_Snprintf(jvmpath, jvmpathsize, "%s/" JVM_DLL, jvmtype); 491 } else { 492 JLI_Snprintf(jvmpath, jvmpathsize, "%s/lib/%s/" JVM_DLL, jrepath, jvmtype); 493 } 494 495 JLI_TraceLauncher("Does `%s' exist ... ", jvmpath); 496 497 if (stat(jvmpath, &s) == 0) { 498 JLI_TraceLauncher("yes.\n"); 499 return JNI_TRUE; 500 } else { 501 JLI_TraceLauncher("no.\n"); 502 return JNI_FALSE; 503 } 504 } 505 506 /* 507 * Find path to JRE based on .exe's location or registry settings. 508 */ 509 static jboolean 510 GetJREPath(char *path, jint pathsize, jboolean speculative) 511 { 512 char libjava[MAXPATHLEN]; 513 struct stat s; 514 515 if (GetApplicationHome(path, pathsize)) { 516 /* Is JRE co-located with the application? */ 517 JLI_Snprintf(libjava, sizeof(libjava), "%s/lib/" JAVA_DLL, path); 518 if (access(libjava, F_OK) == 0) { 519 JLI_TraceLauncher("JRE path is %s\n", path); 520 return JNI_TRUE; 521 } 522 /* ensure storage for path + /jre + NULL */ 523 if ((JLI_StrLen(path) + 4 + 1) > (size_t) pathsize) { 524 JLI_TraceLauncher("Insufficient space to store JRE path\n"); 525 return JNI_FALSE; 526 } 527 /* Does the app ship a private JRE in <apphome>/jre directory? */ 528 JLI_Snprintf(libjava, sizeof(libjava), "%s/jre/lib/" JAVA_DLL, path); 529 if (access(libjava, F_OK) == 0) { 530 JLI_StrCat(path, "/jre"); 531 JLI_TraceLauncher("JRE path is %s\n", path); 532 return JNI_TRUE; 533 } 534 } 535 536 if (GetApplicationHomeFromDll(path, pathsize)) { 537 JLI_Snprintf(libjava, sizeof(libjava), "%s/lib/" JAVA_DLL, path); 538 if (stat(libjava, &s) == 0) { 539 JLI_TraceLauncher("JRE path is %s\n", path); 540 return JNI_TRUE; 541 } 542 } 543 544 if (!speculative) 545 JLI_ReportErrorMessage(JRE_ERROR8 JAVA_DLL); 546 return JNI_FALSE; 547 } 548 549 jboolean 550 LoadJavaVM(const char *jvmpath, InvocationFunctions *ifn) 551 { 552 void *libjvm; 553 554 JLI_TraceLauncher("JVM path is %s\n", jvmpath); 555 556 libjvm = dlopen(jvmpath, RTLD_NOW + RTLD_GLOBAL); 557 if (libjvm == NULL) { 558 #if defined(__solaris__) && defined(__sparc) && !defined(_LP64) /* i.e. 32-bit sparc */ 559 FILE * fp; 560 Elf32_Ehdr elf_head; 561 int count; 562 int location; 563 564 fp = fopen(jvmpath, "r"); 565 if (fp == NULL) { 566 JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror()); 567 return JNI_FALSE; 568 } 569 570 /* read in elf header */ 571 count = fread((void*)(&elf_head), sizeof(Elf32_Ehdr), 1, fp); 572 fclose(fp); 573 if (count < 1) { 574 JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror()); 575 return JNI_FALSE; 576 } 577 578 /* 579 * Check for running a server vm (compiled with -xarch=v8plus) 580 * on a stock v8 processor. In this case, the machine type in 581 * the elf header would not be included the architecture list 582 * provided by the isalist command, which is turn is gotten from 583 * sysinfo. This case cannot occur on 64-bit hardware and thus 584 * does not have to be checked for in binaries with an LP64 data 585 * model. 586 */ 587 if (elf_head.e_machine == EM_SPARC32PLUS) { 588 char buf[257]; /* recommended buffer size from sysinfo man 589 page */ 590 long length; 591 char* location; 592 593 length = sysinfo(SI_ISALIST, buf, 257); 594 if (length > 0) { 595 location = JLI_StrStr(buf, "sparcv8plus "); 596 if (location == NULL) { 597 JLI_ReportErrorMessage(JVM_ERROR3); 598 return JNI_FALSE; 599 } 600 } 601 } 602 #endif 603 JLI_ReportErrorMessage(DLL_ERROR1, __LINE__); 604 JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror()); 605 return JNI_FALSE; 606 } 607 608 ifn->CreateJavaVM = (CreateJavaVM_t) 609 dlsym(libjvm, "JNI_CreateJavaVM"); 610 if (ifn->CreateJavaVM == NULL) { 611 JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror()); 612 return JNI_FALSE; 613 } 614 615 ifn->GetDefaultJavaVMInitArgs = (GetDefaultJavaVMInitArgs_t) 616 dlsym(libjvm, "JNI_GetDefaultJavaVMInitArgs"); 617 if (ifn->GetDefaultJavaVMInitArgs == NULL) { 618 JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror()); 619 return JNI_FALSE; 620 } 621 622 ifn->GetCreatedJavaVMs = (GetCreatedJavaVMs_t) 623 dlsym(libjvm, "JNI_GetCreatedJavaVMs"); 624 if (ifn->GetCreatedJavaVMs == NULL) { 625 JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror()); 626 return JNI_FALSE; 627 } 628 629 return JNI_TRUE; 630 } 631 632 /* 633 * Compute the name of the executable 634 * 635 * In order to re-exec securely we need the absolute path of the 636 * executable. On Solaris getexecname(3c) may not return an absolute 637 * path so we use dladdr to get the filename of the executable and 638 * then use realpath to derive an absolute path. From Solaris 9 639 * onwards the filename returned in DL_info structure from dladdr is 640 * an absolute pathname so technically realpath isn't required. 641 * On Linux we read the executable name from /proc/self/exe. 642 * As a fallback, and for platforms other than Solaris and Linux, 643 * we use FindExecName to compute the executable name. 644 */ 645 const char* 646 SetExecname(char **argv) 647 { 648 char* exec_path = NULL; 649 #if defined(__solaris__) 650 { 651 Dl_info dlinfo; 652 int (*fptr)(); 653 654 fptr = (int (*)())dlsym(RTLD_DEFAULT, "main"); 655 if (fptr == NULL) { 656 JLI_ReportErrorMessage(DLL_ERROR3, dlerror()); 657 return JNI_FALSE; 658 } 659 660 if (dladdr((void*)fptr, &dlinfo)) { 661 char *resolved = (char*)JLI_MemAlloc(PATH_MAX+1); 662 if (resolved != NULL) { 663 exec_path = realpath(dlinfo.dli_fname, resolved); 664 if (exec_path == NULL) { 665 JLI_MemFree(resolved); 666 } 667 } 668 } 669 } 670 #elif defined(__linux__) 671 { 672 const char* self = "/proc/self/exe"; 673 char buf[PATH_MAX+1]; 674 int len = readlink(self, buf, PATH_MAX); 675 if (len >= 0) { 676 buf[len] = '\0'; /* readlink(2) doesn't NUL terminate */ 677 exec_path = JLI_StringDup(buf); 678 } 679 } 680 #else /* !__solaris__ && !__linux__ */ 681 { 682 /* Not implemented */ 683 } 684 #endif 685 686 if (exec_path == NULL) { 687 exec_path = FindExecName(argv[0]); 688 } 689 execname = exec_path; 690 return exec_path; 691 } 692 693 /* --- Splash Screen shared library support --- */ 694 static const char* SPLASHSCREEN_SO = JNI_LIB_NAME("splashscreen"); 695 static void* hSplashLib = NULL; 696 697 void* SplashProcAddress(const char* name) { 698 if (!hSplashLib) { 699 int ret; 700 char jrePath[MAXPATHLEN]; 701 char splashPath[MAXPATHLEN]; 702 703 if (!GetJREPath(jrePath, sizeof(jrePath), JNI_FALSE)) { 704 JLI_ReportErrorMessage(JRE_ERROR1); 705 return NULL; 706 } 707 ret = JLI_Snprintf(splashPath, sizeof(splashPath), "%s/lib/%s", 708 jrePath, SPLASHSCREEN_SO); 709 710 if (ret >= (int) sizeof(splashPath)) { 711 JLI_ReportErrorMessage(JRE_ERROR11); 712 return NULL; 713 } 714 if (ret < 0) { 715 JLI_ReportErrorMessage(JRE_ERROR13); 716 return NULL; 717 } 718 hSplashLib = dlopen(splashPath, RTLD_LAZY | RTLD_GLOBAL); 719 JLI_TraceLauncher("Info: loaded %s\n", splashPath); 720 } 721 if (hSplashLib) { 722 void* sym = dlsym(hSplashLib, name); 723 return sym; 724 } else { 725 return NULL; 726 } 727 } 728 729 void SplashFreeLibrary() { 730 if (hSplashLib) { 731 dlclose(hSplashLib); 732 hSplashLib = NULL; 733 } 734 } 735 736 /* 737 * Signature adapter for pthread_create() or thr_create(). 738 */ 739 static void* ThreadJavaMain(void* args) { 740 return (void*)(intptr_t)JavaMain(args); 741 } 742 743 /* 744 * Block current thread and continue execution in a new thread. 745 */ 746 int 747 CallJavaMainInNewThread(jlong stack_size, void* args) { 748 int rslt; 749 #ifndef __solaris__ 750 pthread_t tid; 751 pthread_attr_t attr; 752 pthread_attr_init(&attr); 753 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE); 754 755 if (stack_size > 0) { 756 pthread_attr_setstacksize(&attr, stack_size); 757 } 758 pthread_attr_setguardsize(&attr, 0); // no pthread guard page on java threads 759 760 if (pthread_create(&tid, &attr, ThreadJavaMain, args) == 0) { 761 void* tmp; 762 pthread_join(tid, &tmp); 763 rslt = (int)(intptr_t)tmp; 764 } else { 765 /* 766 * Continue execution in current thread if for some reason (e.g. out of 767 * memory/LWP) a new thread can't be created. This will likely fail 768 * later in JavaMain as JNI_CreateJavaVM needs to create quite a 769 * few new threads, anyway, just give it a try.. 770 */ 771 rslt = JavaMain(args); 772 } 773 774 pthread_attr_destroy(&attr); 775 #else /* __solaris__ */ 776 thread_t tid; 777 long flags = 0; 778 if (thr_create(NULL, stack_size, ThreadJavaMain, args, flags, &tid) == 0) { 779 void* tmp; 780 thr_join(tid, NULL, &tmp); 781 rslt = (int)(intptr_t)tmp; 782 } else { 783 /* See above. Continue in current thread if thr_create() failed */ 784 rslt = JavaMain(args); 785 } 786 #endif /* !__solaris__ */ 787 return rslt; 788 } 789 790 /* Coarse estimation of number of digits assuming the worst case is a 64-bit pid. */ 791 #define MAX_PID_STR_SZ 20 792 793 void SetJavaLauncherPlatformProps() { 794 /* Linux only */ 795 #ifdef __linux__ 796 const char *substr = "-Dsun.java.launcher.pid="; 797 char *pid_prop_str = (char *)JLI_MemAlloc(JLI_StrLen(substr) + MAX_PID_STR_SZ + 1); 798 sprintf(pid_prop_str, "%s%d", substr, getpid()); 799 AddOption(pid_prop_str, NULL); 800 #endif /* __linux__ */ 801 } 802 803 int 804 JVMInit(InvocationFunctions* ifn, jlong threadStackSize, 805 int argc, char **argv, 806 int mode, char *what, int ret) 807 { 808 ShowSplashScreen(); 809 return ContinueInNewThread(ifn, threadStackSize, argc, argv, mode, what, ret); 810 } 811 812 void 813 PostJVMInit(JNIEnv *env, jclass mainClass, JavaVM *vm) 814 { 815 // stubbed out for windows and *nixes. 816 } 817 818 void 819 RegisterThread() 820 { 821 // stubbed out for windows and *nixes. 822 } 823 824 /* 825 * on unix, we return a false to indicate this option is not applicable 826 */ 827 jboolean 828 ProcessPlatformOption(const char *arg) 829 { 830 return JNI_FALSE; 831 }