1 /*
   2  * Copyright (c) 1998, 2012, 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 #include "version_comp.h"
  40 
  41 
  42 #define JVM_DLL "libjvm.so"
  43 #define JAVA_DLL "libjava.so"
  44 #define LD_LIBRARY_PATH "LD_LIBRARY_PATH"
  45 
  46 /* help jettison the LD_LIBRARY_PATH settings in the future */
  47 #ifndef SETENV_REQUIRED
  48 #define SETENV_REQUIRED
  49 #endif
  50 /*
  51  * If a processor / os combination has the ability to run binaries of
  52  * two data models and cohabitation of jre/jdk bits with both data
  53  * models is supported, then DUAL_MODE is defined.  When DUAL_MODE is
  54  * defined, the architecture names for the narrow and wide version of
  55  * the architecture are defined in LIBARCH64NAME and LIBARCH32NAME.
  56  * Currently  only Solaris on sparc/sparcv9 and i586/amd64 is DUAL_MODE;
  57  * linux i586/amd64 could be defined as DUAL_MODE but that is not the
  58  * current policy.
  59  */
  60 
  61 #ifdef __solaris__
  62 #  define DUAL_MODE
  63 #  ifndef LIBARCH32NAME
  64 #    error "The macro LIBARCH32NAME was not defined on the compile line"
  65 #  endif
  66 #  ifndef LIBARCH64NAME
  67 #    error "The macro LIBARCH64NAME was not defined on the compile line"
  68 #  endif
  69 #  include <sys/systeminfo.h>
  70 #  include <sys/elf.h>
  71 #  include <stdio.h>
  72 #endif
  73 
  74 /*
  75  * Flowchart of launcher execs and options processing on unix
  76  *
  77  * The selection of the proper vm shared library to open depends on
  78  * several classes of command line options, including vm "flavor"
  79  * options (-client, -server) and the data model options, -d32  and
  80  * -d64, as well as a version specification which may have come from
  81  * the command line or from the manifest of an executable jar file.
  82  * The vm selection options are not passed to the running
  83  * virtual machine; they must be screened out by the launcher.
  84  *
  85  * The version specification (if any) is processed first by the
  86  * platform independent routine SelectVersion.  This may result in
  87  * the exec of the specified launcher version.
  88  *
  89  * Previously the launcher modified the LD_LIBRARY_PATH appropriately for the
  90  * desired data model path, regardless if data models matched or not. The
  91  * launcher subsequently exec'ed the desired executable, in order to make the
  92  * LD_LIBRARY_PATH path available, for the runtime linker.
  93  *
  94  * Now, in most cases,the launcher will dlopen the target libjvm.so. All
  95  * required libraries are loaded by the runtime linker, using the
  96  * $RPATH/$ORIGIN baked into the shared libraries at compile time. Therefore,
  97  * in most cases, the launcher will only exec, if the data models are
  98  * mismatched, and will not set any environment variables, regardless of the
  99  * data models.
 100  *
 101  * However, if the environment contains a LD_LIBRARY_PATH, this will cause the
 102  * launcher to inspect the LD_LIBRARY_PATH. The launcher will check
 103  *  a. if the LD_LIBRARY_PATH's first component is the the path to the desired
 104  *     libjvm.so
 105  *  b. if any other libjvm.so is found in any of the paths.
 106  * If case b is true, then the launcher will set the LD_LIBRARY_PATH to the
 107  * desired JRE and reexec, in order to propagate the environment.
 108  *
 109  *  Main
 110  *  (incoming argv)
 111  *  |
 112  * \|/
 113  * SelectVersion
 114  * (selects the JRE version, note: not data model)
 115  *  |
 116  * \|/
 117  * CreateExecutionEnvironment
 118  * (determines desired data model)
 119  *  |
 120  *  |
 121  * \|/
 122  *  Have Desired Model ? --> NO --> Is Dual-Mode ? --> NO --> Exit(with error)
 123  *  |                                          |
 124  *  |                                          |
 125  *  |                                         \|/
 126  *  |                                         YES
 127  *  |                                          |
 128  *  |                                          |
 129  *  |                                         \|/
 130  *  |                                CheckJvmType
 131  *  |                               (removes -client, -server etc.)
 132  *  |                                          |
 133  *  |                                          |
 134  * \|/                                        \|/
 135  * YES                             Find the desired executable/library
 136  *  |                                          |
 137  *  |                                          |
 138  * \|/                                        \|/
 139  * CheckJvmType                          RequiresSetenv
 140  * (removes -client, -server, etc.)
 141  *  |
 142  *  |
 143  * \|/
 144  * TranslateDashJArgs...
 145  * (Prepare to pass args to vm)
 146  *  |
 147  *  |
 148  * \|/
 149  * ParseArguments
 150  * (removes -d32 and -d64 if any,
 151  *  processes version options,
 152  *  creates argument list for vm,
 153  *  etc.)
 154  *   |
 155  *   |
 156  *  \|/
 157  * RequiresSetenv
 158  * Is LD_LIBRARY_PATH
 159  * and friends set ? --> NO --> Have Desired Model ? NO --> Re-exec --> Main
 160  *  YES                              YES --> Continue
 161  *   |
 162  *   |
 163  *  \|/
 164  * Path is desired JRE ? YES --> Have Desired Model ? NO --> Re-exec --> Main
 165  *  NO                               YES --> Continue
 166  *   |
 167  *   |
 168  *  \|/
 169  * Paths have well known
 170  * jvm paths ?       --> NO --> Have Desired Model ? NO --> Re-exec --> Main
 171  *  YES                              YES --> Continue
 172  *   |
 173  *   |
 174  *  \|/
 175  *  Does libjvm.so exit
 176  *  in any of them ? --> NO --> Have Desired Model ? NO --> Re-exec --> Main
 177  *   YES                             YES --> Continue
 178  *   |
 179  *   |
 180  *  \|/
 181  *  Set the LD_LIBRARY_PATH
 182  *   |
 183  *   |
 184  *  \|/
 185  * Re-exec
 186  *   |
 187  *   |
 188  *  \|/
 189  * Main
 190  */
 191 
 192 #define GetArch() GetArchPath(CURRENT_DATA_MODEL)
 193 
 194 /* Store the name of the executable once computed */
 195 static char *execname = NULL;
 196 
 197 /*
 198  * execname accessor from other parts of platform dependent logic
 199  */
 200 const char *
 201 GetExecName() {
 202     return execname;
 203 }
 204 
 205 const char *
 206 GetArchPath(int nbits)
 207 {
 208     switch(nbits) {
 209 #ifdef DUAL_MODE
 210         case 32:
 211             return LIBARCH32NAME;
 212         case 64:
 213             return LIBARCH64NAME;
 214 #endif /* DUAL_MODE */
 215         default:
 216             return LIBARCHNAME;
 217     }
 218 }
 219 
 220 #ifdef SETENV_REQUIRED
 221 static jboolean
 222 JvmExists(const char *path) {
 223     char tmp[PATH_MAX + 1];
 224     struct stat statbuf;
 225     JLI_Snprintf(tmp, PATH_MAX, "%s/%s", path, JVM_DLL);
 226     if (stat(tmp, &statbuf) == 0) {
 227         return JNI_TRUE;
 228     }
 229     return JNI_FALSE;
 230 }
 231 /*
 232  * contains a lib/$LIBARCH/{server,client}/libjvm.so ?
 233  */
 234 static jboolean
 235 ContainsLibJVM(int wanted, const char *env) {
 236     char clientPattern[PATH_MAX + 1];
 237     char serverPattern[PATH_MAX + 1];
 238     char *envpath;
 239     char *path;
 240     jboolean clientPatternFound;
 241     jboolean serverPatternFound;
 242 
 243     /* fastest path */
 244     if (env == NULL) {
 245         return JNI_FALSE;
 246     }
 247 
 248     /* the usual suspects */
 249     JLI_Snprintf(clientPattern, PATH_MAX, "lib/%s/client", GetArchPath(wanted));
 250     JLI_Snprintf(serverPattern, PATH_MAX, "lib/%s/server", GetArchPath(wanted));
 251 
 252     /* to optimize for time, test if any of our usual suspects are present. */
 253     clientPatternFound = JLI_StrStr(env, clientPattern) != NULL;
 254     serverPatternFound = JLI_StrStr(env, serverPattern) != NULL;
 255     if (clientPatternFound == JNI_FALSE && serverPatternFound == JNI_FALSE) {
 256         return JNI_FALSE;
 257     }
 258 
 259     /*
 260      * we have a suspicious path component, check if it contains a libjvm.so
 261      */
 262     envpath = JLI_StringDup(env);
 263     for (path = JLI_StrTok(envpath, ":"); path != NULL; path = JLI_StrTok(NULL, ":")) {
 264         if (clientPatternFound && JLI_StrStr(path, clientPattern) != NULL) {
 265             if (JvmExists(path)) {
 266                 JLI_MemFree(envpath);
 267                 return JNI_TRUE;
 268             }
 269         }
 270         if (serverPatternFound && JLI_StrStr(path, serverPattern)  != NULL) {
 271             if (JvmExists(path)) {
 272                 JLI_MemFree(envpath);
 273                 return JNI_TRUE;
 274             }
 275         }
 276     }
 277     JLI_MemFree(envpath);
 278     return JNI_FALSE;
 279 }
 280 
 281 /*
 282  * Test whether the environment variable needs to be set, see flowchart.
 283  */
 284 static jboolean
 285 RequiresSetenv(int wanted, const char *jvmpath) {
 286     char jpath[PATH_MAX + 1];
 287     char *llp;
 288     char *dmllp = NULL;
 289     char *p; /* a utility pointer */
 290 
 291     llp = getenv("LD_LIBRARY_PATH");
 292 #ifdef __solaris__
 293     dmllp = (CURRENT_DATA_MODEL == 32)
 294             ? getenv("LD_LIBRARY_PATH_32")
 295             : getenv("LD_LIBRARY_PATH_64");
 296 #endif /* __solaris__ */
 297     /* no environment variable is a good environment variable */
 298     if (llp == NULL && dmllp == NULL) {
 299         return JNI_FALSE;
 300     }
 301 #ifdef __linux
 302     /*
 303      * On linux, if a binary is running as sgid or suid, glibc sets
 304      * LD_LIBRARY_PATH to the empty string for security purposes. (In contrast,
 305      * on Solaris the LD_LIBRARY_PATH variable for a privileged binary does not
 306      * lose its settings; but the dynamic linker does apply more scrutiny to the
 307      * path.) The launcher uses the value of LD_LIBRARY_PATH to prevent an exec
 308      * loop, here and further downstream. Therefore, if we are running sgid or
 309      * suid, this function's setting of LD_LIBRARY_PATH will be ineffective and
 310      * we should case a return from the calling function.  Getting the right
 311      * libraries will be handled by the RPATH. In reality, this check is
 312      * redundant, as the previous check for a non-null LD_LIBRARY_PATH will
 313      * return back to the calling function forthwith, it is left here to safe
 314      * guard against any changes, in the glibc's existing security policy.
 315      */
 316     if ((getgid() != getegid()) || (getuid() != geteuid())) {
 317         return JNI_FALSE;
 318     }
 319 #endif /* __linux */
 320 
 321     /*
 322      * Prevent recursions. Since LD_LIBRARY_PATH is the one which will be set by
 323      * previous versions of the JRE, thus it is the only path that matters here.
 324      * So we check to see if the desired JRE is set.
 325      */
 326     JLI_StrNCpy(jpath, jvmpath, PATH_MAX);
 327     p = JLI_StrRChr(jpath, '/');
 328     *p = '\0';
 329     if (llp != NULL && JLI_StrNCmp(llp, jpath, JLI_StrLen(jpath)) == 0) {
 330         return JNI_FALSE;
 331     }
 332 
 333     /* scrutinize all the paths further */
 334     if (llp != NULL &&  ContainsLibJVM(wanted, llp)) {
 335         return JNI_TRUE;
 336     }
 337     if (dmllp != NULL && ContainsLibJVM(wanted, dmllp)) {
 338         return JNI_TRUE;
 339     }
 340     return JNI_FALSE;
 341 }
 342 #endif /* SETENV_REQUIRED */
 343 
 344 void
 345 CreateExecutionEnvironment(int *pargc, char ***pargv,
 346                            char jrepath[], jint so_jrepath,
 347                            char jvmpath[], jint so_jvmpath,
 348                            char jvmcfg[],  jint so_jvmcfg) {
 349   /*
 350    * First, determine if we are running the desired data model.  If we
 351    * are running the desired data model, all the error messages
 352    * associated with calling GetJREPath, ReadKnownVMs, etc. should be
 353    * output.  However, if we are not running the desired data model,
 354    * some of the errors should be suppressed since it is more
 355    * informative to issue an error message based on whether or not the
 356    * os/processor combination has dual mode capabilities.
 357    */
 358     jboolean jvmpathExists;
 359 
 360     /* Compute/set the name of the executable */
 361     SetExecname(*pargv);
 362 
 363     /* Check data model flags, and exec process, if needed */
 364     {
 365       char *arch        = (char *)GetArch(); /* like sparc or sparcv9 */
 366       char * jvmtype    = NULL;
 367       int  argc         = *pargc;
 368       char **argv       = *pargv;
 369       int running       = CURRENT_DATA_MODEL;
 370 
 371       int wanted        = running;      /* What data mode is being
 372                                            asked for? Current model is
 373                                            fine unless another model
 374                                            is asked for */
 375 #ifdef SETENV_REQUIRED
 376       jboolean mustsetenv = JNI_FALSE;
 377       char *runpath     = NULL; /* existing effective LD_LIBRARY_PATH setting */
 378       char* new_runpath = NULL; /* desired new LD_LIBRARY_PATH string */
 379       char* newpath     = NULL; /* path on new LD_LIBRARY_PATH */
 380       char* lastslash   = NULL;
 381       char** newenvp    = NULL; /* current environment */
 382 #ifdef __solaris__
 383       char*  dmpath     = NULL;  /* data model specific LD_LIBRARY_PATH,
 384                                     Solaris only */
 385 #endif /* __solaris__ */
 386 #endif  /* SETENV_REQUIRED */
 387 
 388       char** newargv    = NULL;
 389       int    newargc    = 0;
 390 
 391       /*
 392        * Starting in 1.5, all unix platforms accept the -d32 and -d64
 393        * options.  On platforms where only one data-model is supported
 394        * (e.g. ia-64 Linux), using the flag for the other data model is
 395        * an error and will terminate the program.
 396        */
 397 
 398       { /* open new scope to declare local variables */
 399         int i;
 400 
 401         newargv = (char **)JLI_MemAlloc((argc+1) * sizeof(char*));
 402         newargv[newargc++] = argv[0];
 403 
 404         /* scan for data model arguments and remove from argument list;
 405            last occurrence determines desired data model */
 406         for (i=1; i < argc; i++) {
 407 
 408           if (JLI_StrCmp(argv[i], "-J-d64") == 0 || JLI_StrCmp(argv[i], "-d64") == 0) {
 409             wanted = 64;
 410             continue;
 411           }
 412           if (JLI_StrCmp(argv[i], "-J-d32") == 0 || JLI_StrCmp(argv[i], "-d32") == 0) {
 413             wanted = 32;
 414             continue;
 415           }
 416           newargv[newargc++] = argv[i];
 417 
 418           if (IsJavaArgs()) {
 419             if (argv[i][0] != '-') continue;
 420           } else {
 421             if (JLI_StrCmp(argv[i], "-classpath") == 0 || JLI_StrCmp(argv[i], "-cp") == 0) {
 422               i++;
 423               if (i >= argc) break;
 424               newargv[newargc++] = argv[i];
 425               continue;
 426             }
 427             if (argv[i][0] != '-') { i++; break; }
 428           }
 429         }
 430 
 431         /* copy rest of args [i .. argc) */
 432         while (i < argc) {
 433           newargv[newargc++] = argv[i++];
 434         }
 435         newargv[newargc] = NULL;
 436 
 437         /*
 438          * newargv has all proper arguments here
 439          */
 440 
 441         argc = newargc;
 442         argv = newargv;
 443       }
 444 
 445       /* If the data model is not changing, it is an error if the
 446          jvmpath does not exist */
 447       if (wanted == running) {
 448         /* Find out where the JRE is that we will be using. */
 449         if (!GetJREPath(jrepath, so_jrepath, arch, JNI_FALSE) ) {
 450           JLI_ReportErrorMessage(JRE_ERROR1);
 451           exit(2);
 452         }
 453         JLI_Snprintf(jvmcfg, so_jvmcfg, "%s%slib%s%s%sjvm.cfg",
 454                      jrepath, FILESEP, FILESEP,  arch, FILESEP);
 455         /* Find the specified JVM type */
 456         if (ReadKnownVMs(jvmcfg, JNI_FALSE) < 1) {
 457           JLI_ReportErrorMessage(CFG_ERROR7);
 458           exit(1);
 459         }
 460 
 461         jvmpath[0] = '\0';
 462         jvmtype = CheckJvmType(pargc, pargv, JNI_FALSE);
 463         if (JLI_StrCmp(jvmtype, "ERROR") == 0) {
 464             JLI_ReportErrorMessage(CFG_ERROR9);
 465             exit(4);
 466         }
 467 
 468         if (!GetJVMPath(jrepath, jvmtype, jvmpath, so_jvmpath, arch, 0 )) {
 469           JLI_ReportErrorMessage(CFG_ERROR8, jvmtype, jvmpath);
 470           exit(4);
 471         }
 472         /*
 473          * we seem to have everything we need, so without further ado
 474          * we return back, otherwise proceed to set the environment.
 475          */
 476 #ifdef SETENV_REQUIRED
 477         mustsetenv = RequiresSetenv(wanted, jvmpath);
 478         JLI_TraceLauncher("mustsetenv: %s\n", mustsetenv ? "TRUE" : "FALSE");
 479 
 480         if (mustsetenv == JNI_FALSE) {
 481             JLI_MemFree(newargv);
 482             return;
 483         }
 484 #else
 485         JLI_MemFree(newargv);
 486         return;
 487 #endif /* SETENV_REQUIRED */
 488       } else {  /* do the same speculatively or exit */
 489 #ifdef DUAL_MODE
 490         if (running != wanted) {
 491           /* Find out where the JRE is that we will be using. */
 492           if (!GetJREPath(jrepath, so_jrepath, GetArchPath(wanted), JNI_TRUE)) {
 493             /* give up and let other code report error message */
 494             JLI_ReportErrorMessage(JRE_ERROR2, wanted);
 495             exit(1);
 496           }
 497           JLI_Snprintf(jvmcfg, so_jvmcfg, "%s%slib%s%s%sjvm.cfg",
 498                        jrepath, FILESEP, FILESEP, GetArchPath(wanted), FILESEP);
 499           /*
 500            * Read in jvm.cfg for target data model and process vm
 501            * selection options.
 502            */
 503           if (ReadKnownVMs(jvmcfg, JNI_TRUE) < 1) {
 504             /* give up and let other code report error message */
 505             JLI_ReportErrorMessage(JRE_ERROR2, wanted);
 506             exit(1);
 507           }
 508           jvmpath[0] = '\0';
 509           jvmtype = CheckJvmType(pargc, pargv, JNI_TRUE);
 510           if (JLI_StrCmp(jvmtype, "ERROR") == 0) {
 511             JLI_ReportErrorMessage(CFG_ERROR9);
 512             exit(4);
 513           }
 514 
 515           /* exec child can do error checking on the existence of the path */
 516           jvmpathExists = GetJVMPath(jrepath, jvmtype, jvmpath, so_jvmpath, GetArchPath(wanted), 0);
 517 #ifdef SETENV_REQUIRED
 518           mustsetenv = RequiresSetenv(wanted, jvmpath);
 519 #endif /* SETENV_REQUIRED */
 520         }
 521 #else /* ! DUALMODE */
 522         JLI_ReportErrorMessage(JRE_ERROR2, wanted);
 523         exit(1);
 524 #endif /* DUAL_MODE */
 525         }
 526 #ifdef SETENV_REQUIRED
 527         if (mustsetenv) {
 528             /*
 529              * We will set the LD_LIBRARY_PATH as follows:
 530              *
 531              *     o          $JVMPATH (directory portion only)
 532              *     o          $JRE/lib/$LIBARCHNAME
 533              *     o          $JRE/../lib/$LIBARCHNAME
 534              *
 535              * followed by the user's previous effective LD_LIBRARY_PATH, if
 536              * any.
 537              */
 538 
 539 #ifdef __solaris__
 540             /*
 541              * Starting in Solaris 7, ld.so.1 supports three LD_LIBRARY_PATH
 542              * variables:
 543              *
 544              * 1. LD_LIBRARY_PATH -- used for 32 and 64 bit searches if
 545              * data-model specific variables are not set.
 546              *
 547              * 2. LD_LIBRARY_PATH_64 -- overrides and replaces LD_LIBRARY_PATH
 548              * for 64-bit binaries.
 549              *
 550              * 3. LD_LIBRARY_PATH_32 -- overrides and replaces LD_LIBRARY_PATH
 551              * for 32-bit binaries.
 552              *
 553              * The vm uses LD_LIBRARY_PATH to set the java.library.path system
 554              * property.  To shield the vm from the complication of multiple
 555              * LD_LIBRARY_PATH variables, if the appropriate data model
 556              * specific variable is set, we will act as if LD_LIBRARY_PATH had
 557              * the value of the data model specific variant and the data model
 558              * specific variant will be unset.  Note that the variable for the
 559              * *wanted* data model must be used (if it is set), not simply the
 560              * current running data model.
 561              */
 562 
 563             switch (wanted) {
 564                 case 0:
 565                     if (running == 32) {
 566                         dmpath = getenv("LD_LIBRARY_PATH_32");
 567                         wanted = 32;
 568                     } else {
 569                         dmpath = getenv("LD_LIBRARY_PATH_64");
 570                         wanted = 64;
 571                     }
 572                     break;
 573 
 574                 case 32:
 575                     dmpath = getenv("LD_LIBRARY_PATH_32");
 576                     break;
 577 
 578                 case 64:
 579                     dmpath = getenv("LD_LIBRARY_PATH_64");
 580                     break;
 581 
 582                 default:
 583                     JLI_ReportErrorMessage(JRE_ERROR3, __LINE__);
 584                     exit(1); /* unknown value in wanted */
 585                     break;
 586             }
 587 
 588             /*
 589              * If dmpath is NULL, the relevant data model specific variable is
 590              * not set and normal LD_LIBRARY_PATH should be used.
 591              */
 592             if (dmpath == NULL) {
 593                 runpath = getenv("LD_LIBRARY_PATH");
 594             } else {
 595                 runpath = dmpath;
 596             }
 597 #else /* ! __solaris__ */
 598             /*
 599              * If not on Solaris, assume only a single LD_LIBRARY_PATH
 600              * variable.
 601              */
 602             runpath = getenv("LD_LIBRARY_PATH");
 603 #endif /* __solaris__ */
 604 
 605             /* runpath contains current effective LD_LIBRARY_PATH setting */
 606 
 607             jvmpath = JLI_StringDup(jvmpath);
 608             new_runpath = JLI_MemAlloc(((runpath != NULL) ? JLI_StrLen(runpath) : 0) +
 609                     2 * JLI_StrLen(jrepath) + 2 * JLI_StrLen(arch) +
 610                     JLI_StrLen(jvmpath) + 52);
 611             newpath = new_runpath + JLI_StrLen("LD_LIBRARY_PATH=");
 612 
 613 
 614             /*
 615              * Create desired LD_LIBRARY_PATH value for target data model.
 616              */
 617             {
 618                 /* remove the name of the .so from the JVM path */
 619                 lastslash = JLI_StrRChr(jvmpath, '/');
 620                 if (lastslash)
 621                     *lastslash = '\0';
 622 
 623                 sprintf(new_runpath, "LD_LIBRARY_PATH="
 624                         "%s:"
 625                         "%s/lib/%s:"
 626                         "%s/../lib/%s",
 627                         jvmpath,
 628 #ifdef DUAL_MODE
 629                         jrepath, GetArchPath(wanted),
 630                         jrepath, GetArchPath(wanted)
 631 #else /* !DUAL_MODE */
 632                         jrepath, arch,
 633                         jrepath, arch
 634 #endif /* DUAL_MODE */
 635                         );
 636 
 637 
 638                 /*
 639                  * Check to make sure that the prefix of the current path is the
 640                  * desired environment variable setting, though the RequiresSetenv
 641                  * checks if the desired runpath exists, this logic does a more
 642                  * comprehensive check.
 643                  */
 644                 if (runpath != NULL &&
 645                         JLI_StrNCmp(newpath, runpath, JLI_StrLen(newpath)) == 0 &&
 646                         (runpath[JLI_StrLen(newpath)] == 0 || runpath[JLI_StrLen(newpath)] == ':') &&
 647                         (running == wanted) /* data model does not have to be changed */
 648 #ifdef __solaris__
 649                         && (dmpath == NULL) /* data model specific variables not set  */
 650 #endif /* __solaris__ */
 651                         ) {
 652 
 653                     return;
 654 
 655                 }
 656             }
 657 
 658             /*
 659              * Place the desired environment setting onto the prefix of
 660              * LD_LIBRARY_PATH.  Note that this prevents any possible infinite
 661              * loop of execv() because we test for the prefix, above.
 662              */
 663             if (runpath != 0) {
 664                 JLI_StrCat(new_runpath, ":");
 665                 JLI_StrCat(new_runpath, runpath);
 666             }
 667 
 668             if (putenv(new_runpath) != 0) {
 669                 exit(1); /* problem allocating memory; LD_LIBRARY_PATH not set
 670                     properly */
 671             }
 672 
 673             /*
 674              * Unix systems document that they look at LD_LIBRARY_PATH only
 675              * once at startup, so we have to re-exec the current executable
 676              * to get the changed environment variable to have an effect.
 677              */
 678 
 679 #ifdef __solaris__
 680             /*
 681              * If dmpath is not NULL, remove the data model specific string
 682              * in the environment for the exec'ed child.
 683              */
 684             if (dmpath != NULL)
 685                 (void)UnsetEnv((wanted == 32) ? "LD_LIBRARY_PATH_32" : "LD_LIBRARY_PATH_64");
 686 #endif /* __solaris */
 687 
 688             newenvp = environ;
 689         }
 690 #endif /* SETENV_REQUIRED */
 691         {
 692             char *newexec = execname;
 693 #ifdef DUAL_MODE
 694             /*
 695              * If the data model is being changed, the path to the
 696              * executable must be updated accordingly; the executable name
 697              * and directory the executable resides in are separate.  In the
 698              * case of 32 => 64, the new bits are assumed to reside in, e.g.
 699              * "olddir/LIBARCH64NAME/execname"; in the case of 64 => 32,
 700              * the bits are assumed to be in "olddir/../execname".  For example,
 701              *
 702              * olddir/sparcv9/execname
 703              * olddir/amd64/execname
 704              *
 705              * for Solaris SPARC and Linux amd64, respectively.
 706              */
 707 
 708             if (running != wanted) {
 709                 char *oldexec = JLI_StrCpy(JLI_MemAlloc(JLI_StrLen(execname) + 1), execname);
 710                 char *olddir = oldexec;
 711                 char *oldbase = JLI_StrRChr(oldexec, '/');
 712 
 713 
 714                 newexec = JLI_MemAlloc(JLI_StrLen(execname) + 20);
 715                 *oldbase++ = 0;
 716                 sprintf(newexec, "%s/%s/%s", olddir,
 717                         ((wanted == 64) ? LIBARCH64NAME : ".."), oldbase);
 718                 argv[0] = newexec;
 719             }
 720 #endif /* DUAL_MODE */
 721             JLI_TraceLauncher("TRACER_MARKER:About to EXEC\n");
 722             (void) fflush(stdout);
 723             (void) fflush(stderr);
 724 #ifdef SETENV_REQUIRED
 725             if (mustsetenv) {
 726                 execve(newexec, argv, newenvp);
 727             } else {
 728                 execv(newexec, argv);
 729             }
 730 #else /* !SETENV_REQUIRED */
 731             execv(newexec, argv);
 732 #endif /* SETENV_REQUIRED */
 733             JLI_ReportErrorMessageSys(JRE_ERROR4, newexec);
 734 
 735 #ifdef DUAL_MODE
 736             if (running != wanted) {
 737                 JLI_ReportErrorMessage(JRE_ERROR5, wanted, running);
 738 #ifdef __solaris__
 739 #ifdef __sparc
 740                 JLI_ReportErrorMessage(JRE_ERROR6);
 741 #else  /* ! __sparc__ */
 742                 JLI_ReportErrorMessage(JRE_ERROR7);
 743 #endif  /* __sparc */
 744 #endif /* __solaris__ */
 745             }
 746 #endif /* DUAL_MODE */
 747 
 748         }
 749         exit(1);
 750     }
 751 }
 752 
 753 /*
 754  * On Solaris VM choosing is done by the launcher (java.c),
 755  * bitsWanted is used by MacOSX,  on Solaris and Linux this.
 756  * parameter is unused.
 757  */
 758 static jboolean
 759 GetJVMPath(const char *jrepath, const char *jvmtype,
 760            char *jvmpath, jint jvmpathsize, const char * arch, int bitsWanted)
 761 {
 762     struct stat s;
 763 
 764     if (JLI_StrChr(jvmtype, '/')) {
 765         JLI_Snprintf(jvmpath, jvmpathsize, "%s/" JVM_DLL, jvmtype);
 766     } else {
 767         JLI_Snprintf(jvmpath, jvmpathsize, "%s/lib/%s/%s/" JVM_DLL, jrepath, arch, jvmtype);
 768     }
 769 
 770     JLI_TraceLauncher("Does `%s' exist ... ", jvmpath);
 771 
 772     if (stat(jvmpath, &s) == 0) {
 773         JLI_TraceLauncher("yes.\n");
 774         return JNI_TRUE;
 775     } else {
 776         JLI_TraceLauncher("no.\n");
 777         return JNI_FALSE;
 778     }
 779 }
 780 
 781 /*
 782  * Find path to JRE based on .exe's location or registry settings.
 783  */
 784 static jboolean
 785 GetJREPath(char *path, jint pathsize, const char * arch, jboolean speculative)
 786 {
 787     char libjava[MAXPATHLEN];
 788 
 789     if (GetApplicationHome(path, pathsize)) {
 790         /* Is JRE co-located with the application? */
 791         JLI_Snprintf(libjava, sizeof(libjava), "%s/lib/%s/" JAVA_DLL, path, arch);
 792         if (access(libjava, F_OK) == 0) {
 793             JLI_TraceLauncher("JRE path is %s\n", path);
 794             return JNI_TRUE;
 795         }
 796 
 797         /* Does the app ship a private JRE in <apphome>/jre directory? */
 798         JLI_Snprintf(libjava, sizeof(libjava), "%s/jre/lib/%s/" JAVA_DLL, path, arch);
 799         if (access(libjava, F_OK) == 0) {
 800             JLI_StrCat(path, "/jre");
 801             JLI_TraceLauncher("JRE path is %s\n", path);
 802             return JNI_TRUE;
 803         }
 804     }
 805 
 806     if (!speculative)
 807       JLI_ReportErrorMessage(JRE_ERROR8 JAVA_DLL);
 808     return JNI_FALSE;
 809 }
 810 
 811 jboolean
 812 LoadJavaVM(const char *jvmpath, InvocationFunctions *ifn)
 813 {
 814     void *libjvm;
 815 
 816     JLI_TraceLauncher("JVM path is %s\n", jvmpath);
 817 
 818     libjvm = dlopen(jvmpath, RTLD_NOW + RTLD_GLOBAL);
 819     if (libjvm == NULL) {
 820 #if defined(__solaris__) && defined(__sparc) && !defined(_LP64) /* i.e. 32-bit sparc */
 821       FILE * fp;
 822       Elf32_Ehdr elf_head;
 823       int count;
 824       int location;
 825 
 826       fp = fopen(jvmpath, "r");
 827       if (fp == NULL) {
 828         JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
 829         return JNI_FALSE;
 830       }
 831 
 832       /* read in elf header */
 833       count = fread((void*)(&elf_head), sizeof(Elf32_Ehdr), 1, fp);
 834       fclose(fp);
 835       if (count < 1) {
 836         JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
 837         return JNI_FALSE;
 838       }
 839 
 840       /*
 841        * Check for running a server vm (compiled with -xarch=v8plus)
 842        * on a stock v8 processor.  In this case, the machine type in
 843        * the elf header would not be included the architecture list
 844        * provided by the isalist command, which is turn is gotten from
 845        * sysinfo.  This case cannot occur on 64-bit hardware and thus
 846        * does not have to be checked for in binaries with an LP64 data
 847        * model.
 848        */
 849       if (elf_head.e_machine == EM_SPARC32PLUS) {
 850         char buf[257];  /* recommended buffer size from sysinfo man
 851                            page */
 852         long length;
 853         char* location;
 854 
 855         length = sysinfo(SI_ISALIST, buf, 257);
 856         if (length > 0) {
 857             location = JLI_StrStr(buf, "sparcv8plus ");
 858           if (location == NULL) {
 859             JLI_ReportErrorMessage(JVM_ERROR3);
 860             return JNI_FALSE;
 861           }
 862         }
 863       }
 864 #endif
 865         JLI_ReportErrorMessage(DLL_ERROR1, __LINE__);
 866         JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
 867         return JNI_FALSE;
 868     }
 869 
 870     ifn->CreateJavaVM = (CreateJavaVM_t)
 871         dlsym(libjvm, "JNI_CreateJavaVM");
 872     if (ifn->CreateJavaVM == NULL) {
 873         JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
 874         return JNI_FALSE;
 875     }
 876 
 877     ifn->GetDefaultJavaVMInitArgs = (GetDefaultJavaVMInitArgs_t)
 878         dlsym(libjvm, "JNI_GetDefaultJavaVMInitArgs");
 879     if (ifn->GetDefaultJavaVMInitArgs == NULL) {
 880         JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
 881         return JNI_FALSE;
 882     }
 883 
 884     ifn->GetCreatedJavaVMs = (GetCreatedJavaVMs_t)
 885         dlsym(libjvm, "JNI_GetCreatedJavaVMs");
 886     if (ifn->GetCreatedJavaVMs == NULL) {
 887         JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
 888         return JNI_FALSE;
 889     }
 890 
 891     return JNI_TRUE;
 892 }
 893 
 894 /*
 895  * Compute the name of the executable
 896  *
 897  * In order to re-exec securely we need the absolute path of the
 898  * executable. On Solaris getexecname(3c) may not return an absolute
 899  * path so we use dladdr to get the filename of the executable and
 900  * then use realpath to derive an absolute path. From Solaris 9
 901  * onwards the filename returned in DL_info structure from dladdr is
 902  * an absolute pathname so technically realpath isn't required.
 903  * On Linux we read the executable name from /proc/self/exe.
 904  * As a fallback, and for platforms other than Solaris and Linux,
 905  * we use FindExecName to compute the executable name.
 906  */
 907 const char*
 908 SetExecname(char **argv)
 909 {
 910     char* exec_path = NULL;
 911 #if defined(__solaris__)
 912     {
 913         Dl_info dlinfo;
 914         int (*fptr)();
 915 
 916         fptr = (int (*)())dlsym(RTLD_DEFAULT, "main");
 917         if (fptr == NULL) {
 918             JLI_ReportErrorMessage(DLL_ERROR3, dlerror());
 919             return JNI_FALSE;
 920         }
 921 
 922         if (dladdr((void*)fptr, &dlinfo)) {
 923             char *resolved = (char*)JLI_MemAlloc(PATH_MAX+1);
 924             if (resolved != NULL) {
 925                 exec_path = realpath(dlinfo.dli_fname, resolved);
 926                 if (exec_path == NULL) {
 927                     JLI_MemFree(resolved);
 928                 }
 929             }
 930         }
 931     }
 932 #elif defined(__linux__)
 933     {
 934         const char* self = "/proc/self/exe";
 935         char buf[PATH_MAX+1];
 936         int len = readlink(self, buf, PATH_MAX);
 937         if (len >= 0) {
 938             buf[len] = '\0';            /* readlink doesn't nul terminate */
 939             exec_path = JLI_StringDup(buf);
 940         }
 941     }
 942 #else /* !__solaris__ && !__linux__ */
 943     {
 944         /* Not implemented */
 945     }
 946 #endif
 947 
 948     if (exec_path == NULL) {
 949         exec_path = FindExecName(argv[0]);
 950     }
 951     execname = exec_path;
 952     return exec_path;
 953 }
 954 
 955 /* --- Splash Screen shared library support --- */
 956 static const char* SPLASHSCREEN_SO = JNI_LIB_NAME("splashscreen");
 957 static void* hSplashLib = NULL;
 958 
 959 void* SplashProcAddress(const char* name) {
 960     if (!hSplashLib) {
 961         const char * splashLibPath;
 962         splashLibPath = SPLASHSCREEN_SO;
 963         hSplashLib = dlopen(splashLibPath, RTLD_LAZY | RTLD_GLOBAL);
 964     }
 965     if (hSplashLib) {
 966         void* sym = dlsym(hSplashLib, name);
 967         return sym;
 968     } else {
 969         return NULL;
 970     }
 971 }
 972 
 973 void SplashFreeLibrary() {
 974     if (hSplashLib) {
 975         dlclose(hSplashLib);
 976         hSplashLib = NULL;
 977     }
 978 }
 979 
 980 /*
 981  * Block current thread and continue execution in a new thread
 982  */
 983 int
 984 ContinueInNewThread0(int (JNICALL *continuation)(void *), jlong stack_size, void * args) {
 985     int rslt;
 986 #ifdef __linux__
 987     pthread_t tid;
 988     pthread_attr_t attr;
 989     pthread_attr_init(&attr);
 990     pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
 991 
 992     if (stack_size > 0) {
 993       pthread_attr_setstacksize(&attr, stack_size);
 994     }
 995 
 996     if (pthread_create(&tid, &attr, (void *(*)(void*))continuation, (void*)args) == 0) {
 997       void * tmp;
 998       pthread_join(tid, &tmp);
 999       rslt = (int)tmp;
1000     } else {
1001      /*
1002       * Continue execution in current thread if for some reason (e.g. out of
1003       * memory/LWP)  a new thread can't be created. This will likely fail
1004       * later in continuation as JNI_CreateJavaVM needs to create quite a
1005       * few new threads, anyway, just give it a try..
1006       */
1007       rslt = continuation(args);
1008     }
1009 
1010     pthread_attr_destroy(&attr);
1011 #else /* ! __linux__ */
1012     thread_t tid;
1013     long flags = 0;
1014     if (thr_create(NULL, stack_size, (void *(*)(void *))continuation, args, flags, &tid) == 0) {
1015       void * tmp;
1016       thr_join(tid, NULL, &tmp);
1017       rslt = (int)tmp;
1018     } else {
1019       /* See above. Continue in current thread if thr_create() failed */
1020       rslt = continuation(args);
1021     }
1022 #endif /* __linux__ */
1023     return rslt;
1024 }
1025 
1026 /* Coarse estimation of number of digits assuming the worst case is a 64-bit pid. */
1027 #define MAX_PID_STR_SZ   20
1028 
1029 void SetJavaLauncherPlatformProps() {
1030    /* Linux only */
1031 #ifdef __linux__
1032     const char *substr = "-Dsun.java.launcher.pid=";
1033     char *pid_prop_str = (char *)JLI_MemAlloc(JLI_StrLen(substr) + MAX_PID_STR_SZ + 1);
1034     sprintf(pid_prop_str, "%s%d", substr, getpid());
1035     AddOption(pid_prop_str, NULL);
1036 #endif /* __linux__ */
1037 }
1038 
1039 int
1040 JVMInit(InvocationFunctions* ifn, jlong threadStackSize,
1041         int argc, char **argv,
1042         int mode, char *what, int ret)
1043 {
1044     ShowSplashScreen();
1045     return ContinueInNewThread(ifn, threadStackSize, argc, argv, mode, what, ret);
1046 }
1047 
1048 void
1049 PostJVMInit(JNIEnv *env, jstring mainClass, JavaVM *vm)
1050 {
1051     // stubbed out for windows and *nixes.
1052 }
1053 
1054 void
1055 RegisterThread()
1056 {
1057     // stubbed out for windows and *nixes.
1058 }
1059 
1060 /*
1061  * on unix, we return a false to indicate this option is not applicable
1062  */
1063 jboolean
1064 ProcessPlatformOption(const char *arg)
1065 {
1066     return JNI_FALSE;
1067 }