1 /*
   2  * Copyright (c) 1998, 2011, 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 <dirent.h>
  28 #include <dlfcn.h>
  29 #include <fcntl.h>
  30 #include <inttypes.h>
  31 #include <stdio.h>
  32 #include <string.h>
  33 #include <stdlib.h>
  34 #include <sys/stat.h>
  35 #include <unistd.h>
  36 #include <sys/types.h>
  37 #include "manifest_info.h"
  38 #include "version_comp.h"
  39 
  40 #ifdef __linux__
  41 #include <pthread.h>
  42 #else
  43 #include <thread.h>


  44 #endif
  45 
  46 #define JVM_DLL "libjvm.so"
  47 #define JAVA_DLL "libjava.so"
  48 
  49 /* help jettison the LD_LIBRARY_PATH settings in the future */
  50 #ifndef SETENV_REQUIRED
  51 #define SETENV_REQUIRED
  52 #endif
  53 /*
  54  * If a processor / os combination has the ability to run binaries of
  55  * two data models and cohabitation of jre/jdk bits with both data
  56  * models is supported, then DUAL_MODE is defined.  When DUAL_MODE is
  57  * defined, the architecture names for the narrow and wide version of
  58  * the architecture are defined in LIBARCH64NAME and LIBARCH32NAME.
  59  * Currently  only Solaris on sparc/sparcv9 and i586/amd64 is DUAL_MODE;
  60  * linux i586/amd64 could be defined as DUAL_MODE but that is not the
  61  * current policy.
  62  */
  63 
  64 #ifdef __solaris__
  65 #  define DUAL_MODE
  66 #  ifndef LIBARCH32NAME
  67 #    error "The macro LIBARCH32NAME was not defined on the compile line"
  68 #  endif
  69 #  ifndef LIBARCH64NAME
  70 #    error "The macro LIBARCH64NAME was not defined on the compile line"
  71 #  endif
  72 #  include <sys/systeminfo.h>
  73 #  include <sys/elf.h>
  74 #  include <stdio.h>
  75 #endif
  76 
  77 /* pointer to environment */
  78 extern char **environ;
  79 
  80 /*
  81  *      A collection of useful strings. One should think of these as #define
  82  *      entries, but actual strings can be more efficient (with many compilers).
  83  */
  84 #ifdef __linux__
  85 static const char *system_dir   = "/usr/java";
  86 static const char *user_dir     = "/java";
  87 #else /* Solaris */
  88 static const char *system_dir   = "/usr/jdk";
  89 static const char *user_dir     = "/jdk";
  90 #endif
  91 
  92 /* Store the name of the executable once computed */
  93 static char *execname = NULL;
  94 
  95 /*
  96  * Flowchart of launcher execs and options processing on unix
  97  *
  98  * The selection of the proper vm shared library to open depends on
  99  * several classes of command line options, including vm "flavor"
 100  * options (-client, -server) and the data model options, -d32  and
 101  * -d64, as well as a version specification which may have come from
 102  * the command line or from the manifest of an executable jar file.
 103  * The vm selection options are not passed to the running
 104  * virtual machine; they must be screened out by the launcher.
 105  *
 106  * The version specification (if any) is processed first by the
 107  * platform independent routine SelectVersion.  This may result in
 108  * the exec of the specified launcher version.
 109  *
 110  * Previously the launcher modified the LD_LIBRARY_PATH appropriately for the
 111  * desired data model path, regardless if data models matched or not. The
 112  * launcher subsequently exec'ed the desired executable, in order to make the
 113  * LD_LIBRARY_PATH path available, for the runtime linker.
 114  *
 115  * Now, in most cases,the launcher will dlopen the target libjvm.so. All
 116  * required libraries are loaded by the runtime linker, using the
 117  * $RPATH/$ORIGIN baked into the shared libraries at compile time. Therefore,
 118  * in most cases, the launcher will only exec, if the data models are
 119  * mismatched, and will not set any environment variables, regardless of the
 120  * data models.
 121  *
 122  * However, if the environment contains a LD_LIBRARY_PATH, this will cause the
 123  * launcher to inspect the LD_LIBRARY_PATH. The launcher will check
 124  *  a. if the LD_LIBRARY_PATH's first component is the the path to the desired
 125  *     libjvm.so
 126  *  b. if any other libjvm.so is found in any of the paths.
 127  * If case b is true, then the launcher will set the LD_LIBRARY_PATH to the
 128  * desired JRE and reexec, in order to propagate the environment.
 129  *
 130  *  Main
 131  *  (incoming argv)
 132  *  |
 133  * \|/
 134  * SelectVersion
 135  * (selects the JRE version, note: not data model)
 136  *  |
 137  * \|/
 138  * CreateExecutionEnvironment
 139  * (determines desired data model)
 140  *  |
 141  *  |
 142  * \|/
 143  *  Have Desired Model ? --> NO --> Is Dual-Mode ? --> NO --> Exit(with error)
 144  *  |                                          |
 145  *  |                                          |
 146  *  |                                         \|/
 147  *  |                                         YES
 148  *  |                                          |
 149  *  |                                          |
 150  *  |                                         \|/
 151  *  |                                CheckJvmType
 152  *  |                               (removes -client, -server etc.)
 153  *  |                                          |
 154  *  |                                          |
 155  * \|/                                        \|/
 156  * YES                             Find the desired executable/library
 157  *  |                                          |
 158  *  |                                          |
 159  * \|/                                        \|/
 160  * CheckJvmType                          RequiresSetenv
 161  * (removes -client, -server, etc.)
 162  *  |
 163  *  |
 164  * \|/
 165  * TranslateDashJArgs...
 166  * (Prepare to pass args to vm)
 167  *  |
 168  *  |
 169  * \|/
 170  * ParseArguments
 171  * (removes -d32 and -d64 if any,
 172  *  processes version options,
 173  *  creates argument list for vm,
 174  *  etc.)
 175  *   |
 176  *   |
 177  *  \|/
 178  * RequiresSetenv
 179  * Is LD_LIBRARY_PATH
 180  * and friends set ? --> NO --> Have Desired Model ? NO --> Re-exec --> Main
 181  *  YES                              YES --> Continue
 182  *   |
 183  *   |
 184  *  \|/
 185  * Path is desired JRE ? YES --> Have Desired Model ? NO --> Re-exec --> Main
 186  *  NO                               YES --> Continue
 187  *   |
 188  *   |
 189  *  \|/
 190  * Paths have well known
 191  * jvm paths ?       --> NO --> Have Desired Model ? NO --> Re-exec --> Main
 192  *  YES                              YES --> Continue
 193  *   |
 194  *   |
 195  *  \|/
 196  *  Does libjvm.so exit
 197  *  in any of them ? --> NO --> Have Desired Model ? NO --> Re-exec --> Main
 198  *   YES                             YES --> Continue
 199  *   |
 200  *   |
 201  *  \|/
 202  *  Set the LD_LIBRARY_PATH
 203  *   |
 204  *   |
 205  *  \|/
 206  * Re-exec
 207  *   |
 208  *   |
 209  *  \|/
 210  * Main
 211  */
 212 
 213 static const char * SetExecname(char **argv);
 214 static jboolean GetJVMPath(const char *jrepath, const char *jvmtype,
 215                            char *jvmpath, jint jvmpathsize, const char * arch);
 216 static jboolean GetJREPath(char *path, jint pathsize, const char * arch, jboolean speculative);
 217 
 218 
 219 #define GetArch() GetArchPath(CURRENT_DATA_MODEL)
 220 
 221 const char *
 222 GetArchPath(int nbits)
 223 {
 224     switch(nbits) {
 225 #ifdef DUAL_MODE
 226         case 32:
 227             return LIBARCH32NAME;
 228         case 64:
 229             return LIBARCH64NAME;
 230 #endif /* DUAL_MODE */
 231         default:
 232             return LIBARCHNAME;
 233     }
 234 }
 235 
 236 #ifdef SETENV_REQUIRED
 237 static jboolean
 238 JvmExists(const char *path) {
 239     char tmp[PATH_MAX + 1];
 240     struct stat statbuf;
 241     JLI_Snprintf(tmp, PATH_MAX, "%s/%s", path, JVM_DLL);
 242     if (stat(tmp, &statbuf) == 0) {
 243         return JNI_TRUE;
 244     }
 245     return JNI_FALSE;
 246 }
 247 /*
 248  * contains a lib/$LIBARCH/{server,client}/libjvm.so ?
 249  */
 250 static jboolean
 251 ContainsLibJVM(int wanted, const char *env) {
 252     char clientPattern[PATH_MAX + 1];
 253     char serverPattern[PATH_MAX + 1];
 254     char *envpath;
 255     char *path;
 256     jboolean clientPatternFound;
 257     jboolean serverPatternFound;
 258 
 259     /* fastest path */
 260     if (env == NULL) {
 261         return JNI_FALSE;
 262     }
 263 
 264     /* the usual suspects */
 265     JLI_Snprintf(clientPattern, PATH_MAX, "lib/%s/client", GetArchPath(wanted));
 266     JLI_Snprintf(serverPattern, PATH_MAX, "lib/%s/server", GetArchPath(wanted));
 267 
 268     /* to optimize for time, test if any of our usual suspects are present. */
 269     clientPatternFound = JLI_StrStr(env, clientPattern) != NULL;
 270     serverPatternFound = JLI_StrStr(env, serverPattern) != NULL;
 271     if (clientPatternFound == JNI_FALSE && serverPatternFound == JNI_FALSE) {
 272         return JNI_FALSE;
 273     }
 274 
 275     /*
 276      * we have a suspicious path component, check if it contains a libjvm.so
 277      */
 278     envpath = JLI_StringDup(env);
 279     for (path = JLI_StrTok(envpath, ":"); path != NULL; path = JLI_StrTok(NULL, ":")) {
 280         if (clientPatternFound && JLI_StrStr(path, clientPattern) != NULL) {
 281             if (JvmExists(path)) {
 282                 JLI_MemFree(envpath);
 283                 return JNI_TRUE;
 284             }
 285         }
 286         if (serverPatternFound && JLI_StrStr(path, serverPattern)  != NULL) {
 287             if (JvmExists(path)) {
 288                 JLI_MemFree(envpath);
 289                 return JNI_TRUE;
 290             }
 291         }
 292     }
 293     JLI_MemFree(envpath);
 294     return JNI_FALSE;
 295 }
 296 
 297 /*
 298  * Test whether the environment variable needs to be set, see flowchart.
 299  */
 300 static jboolean
 301 RequiresSetenv(int wanted, const char *jvmpath) {
 302     char jpath[PATH_MAX + 1];
 303     char *llp;
 304     char *dmllp = NULL;
 305     char *p; /* a utility pointer */
 306 
 307     llp = getenv("LD_LIBRARY_PATH");
 308 #ifdef __solaris__
 309     dmllp = (CURRENT_DATA_MODEL == 32)
 310             ? getenv("LD_LIBRARY_PATH_32")
 311             : getenv("LD_LIBRARY_PATH_64");
 312 #endif /* __solaris__ */
 313     /* no environment variable is a good environment variable */
 314     if (llp == NULL && dmllp == NULL) {
 315         return JNI_FALSE;
 316     }
 317 #ifdef __linux
 318     /*
 319      * On linux, if a binary is running as sgid or suid, glibc sets
 320      * LD_LIBRARY_PATH to the empty string for security purposes. (In contrast,
 321      * on Solaris the LD_LIBRARY_PATH variable for a privileged binary does not
 322      * lose its settings; but the dynamic linker does apply more scrutiny to the
 323      * path.) The launcher uses the value of LD_LIBRARY_PATH to prevent an exec
 324      * loop, here and further downstream. Therefore, if we are running sgid or
 325      * suid, this function's setting of LD_LIBRARY_PATH will be ineffective and
 326      * we should case a return from the calling function.  Getting the right
 327      * libraries will be handled by the RPATH. In reality, this check is
 328      * redundant, as the previous check for a non-null LD_LIBRARY_PATH will
 329      * return back to the calling function forthwith, it is left here to safe
 330      * guard against any changes, in the glibc's existing security policy.
 331      */
 332     if ((getgid() != getegid()) || (getuid() != geteuid())) {
 333         return JNI_FALSE;
 334     }
 335 #endif /* __linux */
 336 
 337     /*
 338      * Prevent recursions. Since LD_LIBRARY_PATH is the one which will be set by
 339      * previous versions of the JRE, thus it is the only path that matters here.
 340      * So we check to see if the desired JRE is set.
 341      */
 342     JLI_StrNCpy(jpath, jvmpath, PATH_MAX);
 343     p = JLI_StrRChr(jpath, '/');
 344     *p = '\0';
 345     if (llp != NULL && JLI_StrNCmp(llp, jpath, JLI_StrLen(jpath)) == 0) {
 346         return JNI_FALSE;
 347     }
 348 
 349     /* scrutinize all the paths further */
 350     if (llp != NULL &&  ContainsLibJVM(wanted, llp)) {
 351         return JNI_TRUE;
 352     }
 353     if (dmllp != NULL && ContainsLibJVM(wanted, dmllp)) {
 354         return JNI_TRUE;
 355     }
 356     return JNI_FALSE;
 357 }
 358 #endif /* SETENV_REQUIRED */
 359 
 360 void
 361 CreateExecutionEnvironment(int *pargc, char ***pargv,
 362                            char jrepath[], jint so_jrepath,
 363                            char jvmpath[], jint so_jvmpath) {
 364   /*
 365    * First, determine if we are running the desired data model.  If we
 366    * are running the desired data model, all the error messages
 367    * associated with calling GetJREPath, ReadKnownVMs, etc. should be
 368    * output.  However, if we are not running the desired data model,
 369    * some of the errors should be suppressed since it is more
 370    * informative to issue an error message based on whether or not the
 371    * os/processor combination has dual mode capabilities.
 372    */
 373     jboolean jvmpathExists;
 374 
 375     /* Compute/set the name of the executable */
 376     SetExecname(*pargv);
 377 
 378     /* Check data model flags, and exec process, if needed */
 379     {
 380       char *arch        = (char *)GetArch(); /* like sparc or sparcv9 */
 381       char * jvmtype    = NULL;
 382       int  argc         = *pargc;
 383       char **argv       = *pargv;
 384       int running       = CURRENT_DATA_MODEL;
 385 
 386       int wanted        = running;      /* What data mode is being
 387                                            asked for? Current model is
 388                                            fine unless another model
 389                                            is asked for */
 390 #ifdef SETENV_REQUIRED
 391       jboolean mustsetenv = JNI_FALSE;
 392       char *runpath     = NULL; /* existing effective LD_LIBRARY_PATH setting */
 393       char* new_runpath = NULL; /* desired new LD_LIBRARY_PATH string */
 394       char* newpath     = NULL; /* path on new LD_LIBRARY_PATH */
 395       char* lastslash   = NULL;
 396       char** newenvp    = NULL; /* current environment */
 397 #ifdef __solaris__
 398       char*  dmpath     = NULL;  /* data model specific LD_LIBRARY_PATH,
 399                                     Solaris only */
 400 #endif /* __solaris__ */
 401 #endif  /* SETENV_REQUIRED */
 402 
 403       char** newargv    = NULL;
 404       int    newargc    = 0;
 405 
 406       /*
 407        * Starting in 1.5, all unix platforms accept the -d32 and -d64
 408        * options.  On platforms where only one data-model is supported
 409        * (e.g. ia-64 Linux), using the flag for the other data model is
 410        * an error and will terminate the program.
 411        */
 412 
 413       { /* open new scope to declare local variables */
 414         int i;
 415 
 416         newargv = (char **)JLI_MemAlloc((argc+1) * sizeof(char*));
 417         newargv[newargc++] = argv[0];
 418 
 419         /* scan for data model arguments and remove from argument list;
 420            last occurrence determines desired data model */
 421         for (i=1; i < argc; i++) {
 422 
 423           if (JLI_StrCmp(argv[i], "-J-d64") == 0 || JLI_StrCmp(argv[i], "-d64") == 0) {
 424             wanted = 64;
 425             continue;
 426           }
 427           if (JLI_StrCmp(argv[i], "-J-d32") == 0 || JLI_StrCmp(argv[i], "-d32") == 0) {
 428             wanted = 32;
 429             continue;
 430           }
 431           newargv[newargc++] = argv[i];
 432 
 433           if (IsJavaArgs()) {
 434             if (argv[i][0] != '-') continue;
 435           } else {
 436             if (JLI_StrCmp(argv[i], "-classpath") == 0 || JLI_StrCmp(argv[i], "-cp") == 0) {
 437               i++;
 438               if (i >= argc) break;
 439               newargv[newargc++] = argv[i];
 440               continue;
 441             }
 442             if (argv[i][0] != '-') { i++; break; }
 443           }
 444         }
 445 
 446         /* copy rest of args [i .. argc) */
 447         while (i < argc) {
 448           newargv[newargc++] = argv[i++];
 449         }
 450         newargv[newargc] = NULL;
 451 
 452         /*
 453          * newargv has all proper arguments here
 454          */
 455 
 456         argc = newargc;
 457         argv = newargv;
 458       }
 459 
 460       /* If the data model is not changing, it is an error if the
 461          jvmpath does not exist */
 462       if (wanted == running) {
 463         /* Find out where the JRE is that we will be using. */
 464         if (!GetJREPath(jrepath, so_jrepath, arch, JNI_FALSE) ) {
 465           JLI_ReportErrorMessage(JRE_ERROR1);
 466           exit(2);
 467         }
 468 
 469         /* Find the specified JVM type */
 470         if (ReadKnownVMs(jrepath, arch, JNI_FALSE) < 1) {
 471           JLI_ReportErrorMessage(CFG_ERROR7);
 472           exit(1);
 473         }
 474 
 475         jvmpath[0] = '\0';
 476         jvmtype = CheckJvmType(pargc, pargv, JNI_FALSE);
 477         if (JLI_StrCmp(jvmtype, "ERROR") == 0) {
 478             JLI_ReportErrorMessage(CFG_ERROR9);
 479             exit(4);
 480         }
 481 
 482         if (!GetJVMPath(jrepath, jvmtype, jvmpath, so_jvmpath, arch )) {
 483           JLI_ReportErrorMessage(CFG_ERROR8, jvmtype, jvmpath);
 484           exit(4);
 485         }
 486         /*
 487          * we seem to have everything we need, so without further ado
 488          * we return back, otherwise proceed to set the environment.
 489          */
 490 #ifdef SETENV_REQUIRED
 491         mustsetenv = RequiresSetenv(wanted, jvmpath);
 492         JLI_TraceLauncher("mustsetenv: %s\n", mustsetenv ? "TRUE" : "FALSE");
 493 
 494         if (mustsetenv == JNI_FALSE) {
 495             return;
 496         }
 497 #else
 498         return;
 499 #endif /* SETENV_REQUIRED */
 500       } else {  /* do the same speculatively or exit */
 501 #ifdef DUAL_MODE
 502         if (running != wanted) {
 503           /* Find out where the JRE is that we will be using. */
 504           if (!GetJREPath(jrepath, so_jrepath, GetArchPath(wanted), JNI_TRUE)) {
 505             /* give up and let other code report error message */
 506             JLI_ReportErrorMessage(JRE_ERROR2, wanted);
 507             exit(1);
 508           }
 509 
 510           /*
 511            * Read in jvm.cfg for target data model and process vm
 512            * selection options.
 513            */
 514           if (ReadKnownVMs(jrepath, GetArchPath(wanted), JNI_TRUE) < 1) {
 515             /* give up and let other code report error message */
 516             JLI_ReportErrorMessage(JRE_ERROR2, wanted);
 517             exit(1);
 518           }
 519           jvmpath[0] = '\0';
 520           jvmtype = CheckJvmType(pargc, pargv, JNI_TRUE);
 521           if (JLI_StrCmp(jvmtype, "ERROR") == 0) {
 522             JLI_ReportErrorMessage(CFG_ERROR9);
 523             exit(4);
 524           }
 525 
 526           /* exec child can do error checking on the existence of the path */
 527           jvmpathExists = GetJVMPath(jrepath, jvmtype, jvmpath, so_jvmpath, GetArchPath(wanted));
 528 #ifdef SETENV_REQUIRED
 529           mustsetenv = RequiresSetenv(wanted, jvmpath);
 530 #endif /* SETENV_REQUIRED */
 531         }
 532 #else
 533         JLI_ReportErrorMessage(JRE_ERROR2, wanted);
 534         exit(1);
 535 #endif
 536         }
 537 #ifdef SETENV_REQUIRED
 538         if (mustsetenv) {
 539             /*
 540              * We will set the LD_LIBRARY_PATH as follows:
 541              *
 542              *     o          $JVMPATH (directory portion only)
 543              *     o          $JRE/lib/$LIBARCHNAME
 544              *     o          $JRE/../lib/$LIBARCHNAME
 545              *
 546              * followed by the user's previous effective LD_LIBRARY_PATH, if
 547              * any.
 548              */
 549 
 550 #ifdef __solaris__
 551             /*
 552              * Starting in Solaris 7, ld.so.1 supports three LD_LIBRARY_PATH
 553              * variables:
 554              *
 555              * 1. LD_LIBRARY_PATH -- used for 32 and 64 bit searches if
 556              * data-model specific variables are not set.
 557              *
 558              * 2. LD_LIBRARY_PATH_64 -- overrides and replaces LD_LIBRARY_PATH
 559              * for 64-bit binaries.
 560              *
 561              * 3. LD_LIBRARY_PATH_32 -- overrides and replaces LD_LIBRARY_PATH
 562              * for 32-bit binaries.
 563              *
 564              * The vm uses LD_LIBRARY_PATH to set the java.library.path system
 565              * property.  To shield the vm from the complication of multiple
 566              * LD_LIBRARY_PATH variables, if the appropriate data model
 567              * specific variable is set, we will act as if LD_LIBRARY_PATH had
 568              * the value of the data model specific variant and the data model
 569              * specific variant will be unset.  Note that the variable for the
 570              * *wanted* data model must be used (if it is set), not simply the
 571              * current running data model.
 572              */
 573 
 574             switch (wanted) {
 575                 case 0:
 576                     if (running == 32) {
 577                         dmpath = getenv("LD_LIBRARY_PATH_32");
 578                         wanted = 32;
 579                     } else {
 580                         dmpath = getenv("LD_LIBRARY_PATH_64");
 581                         wanted = 64;
 582                     }
 583                     break;
 584 
 585                 case 32:
 586                     dmpath = getenv("LD_LIBRARY_PATH_32");
 587                     break;
 588 
 589                 case 64:
 590                     dmpath = getenv("LD_LIBRARY_PATH_64");
 591                     break;
 592 
 593                 default:
 594                     JLI_ReportErrorMessage(JRE_ERROR3, __LINE__);
 595                     exit(1); /* unknown value in wanted */
 596                     break;
 597             }
 598 
 599             /*
 600              * If dmpath is NULL, the relevant data model specific variable is
 601              * not set and normal LD_LIBRARY_PATH should be used.
 602              */
 603             if (dmpath == NULL) {
 604                 runpath = getenv("LD_LIBRARY_PATH");
 605             } else {
 606                 runpath = dmpath;
 607             }
 608 #else
 609             /*
 610              * If not on Solaris, assume only a single LD_LIBRARY_PATH
 611              * variable.
 612              */
 613             runpath = getenv("LD_LIBRARY_PATH");
 614 #endif /* __solaris__ */
 615 
 616             /* runpath contains current effective LD_LIBRARY_PATH setting */
 617 
 618             jvmpath = JLI_StringDup(jvmpath);
 619             new_runpath = JLI_MemAlloc(((runpath != NULL) ? JLI_StrLen(runpath) : 0) +
 620                     2 * JLI_StrLen(jrepath) + 2 * JLI_StrLen(arch) +
 621                     JLI_StrLen(jvmpath) + 52);
 622             newpath = new_runpath + JLI_StrLen("LD_LIBRARY_PATH=");
 623 
 624 
 625             /*
 626              * Create desired LD_LIBRARY_PATH value for target data model.
 627              */
 628             {
 629                 /* remove the name of the .so from the JVM path */
 630                 lastslash = JLI_StrRChr(jvmpath, '/');
 631                 if (lastslash)
 632                     *lastslash = '\0';
 633 
 634                 sprintf(new_runpath, "LD_LIBRARY_PATH="
 635                         "%s:"
 636                         "%s/lib/%s:"
 637                         "%s/../lib/%s",
 638                         jvmpath,
 639 #ifdef DUAL_MODE
 640                         jrepath, GetArchPath(wanted),
 641                         jrepath, GetArchPath(wanted)
 642 #else
 643                         jrepath, arch,
 644                         jrepath, arch
 645 #endif
 646                         );
 647 
 648 
 649                 /*
 650                  * Check to make sure that the prefix of the current path is the
 651                  * desired environment variable setting, though the RequiresSetenv
 652                  * checks if the desired runpath exists, this logic does a more
 653                  * comprehensive check.
 654                  */
 655                 if (runpath != NULL &&
 656                         JLI_StrNCmp(newpath, runpath, JLI_StrLen(newpath)) == 0 &&
 657                         (runpath[JLI_StrLen(newpath)] == 0 || runpath[JLI_StrLen(newpath)] == ':') &&
 658                         (running == wanted) /* data model does not have to be changed */
 659 #ifdef __solaris__
 660                         && (dmpath == NULL) /* data model specific variables not set  */
 661 #endif
 662                         ) {
 663 
 664                     return;
 665 
 666                 }
 667             }
 668 
 669             /*
 670              * Place the desired environment setting onto the prefix of
 671              * LD_LIBRARY_PATH.  Note that this prevents any possible infinite
 672              * loop of execv() because we test for the prefix, above.
 673              */
 674             if (runpath != 0) {
 675                 JLI_StrCat(new_runpath, ":");
 676                 JLI_StrCat(new_runpath, runpath);
 677             }
 678 
 679             if (putenv(new_runpath) != 0) {
 680                 exit(1); /* problem allocating memory; LD_LIBRARY_PATH not set
 681                     properly */
 682             }
 683 
 684             /*
 685              * Unix systems document that they look at LD_LIBRARY_PATH only
 686              * once at startup, so we have to re-exec the current executable
 687              * to get the changed environment variable to have an effect.
 688              */
 689 
 690 #ifdef __solaris__
 691             /*
 692              * If dmpath is not NULL, remove the data model specific string
 693              * in the environment for the exec'ed child.
 694              */
 695             if (dmpath != NULL)
 696                 (void)UnsetEnv((wanted == 32) ? "LD_LIBRARY_PATH_32" : "LD_LIBRARY_PATH_64");
 697 #endif
 698 
 699             newenvp = environ;
 700         }
 701 #endif /* SETENV_REQUIRED */
 702         {
 703             char *newexec = execname;
 704 #ifdef DUAL_MODE
 705             /*
 706              * If the data model is being changed, the path to the
 707              * executable must be updated accordingly; the executable name
 708              * and directory the executable resides in are separate.  In the
 709              * case of 32 => 64, the new bits are assumed to reside in, e.g.
 710              * "olddir/LIBARCH64NAME/execname"; in the case of 64 => 32,
 711              * the bits are assumed to be in "olddir/../execname".  For example,
 712              *
 713              * olddir/sparcv9/execname
 714              * olddir/amd64/execname
 715              *
 716              * for Solaris SPARC and Linux amd64, respectively.
 717              */
 718 
 719             if (running != wanted) {
 720                 char *oldexec = JLI_StrCpy(JLI_MemAlloc(JLI_StrLen(execname) + 1), execname);
 721                 char *olddir = oldexec;
 722                 char *oldbase = JLI_StrRChr(oldexec, '/');
 723 
 724 
 725                 newexec = JLI_MemAlloc(JLI_StrLen(execname) + 20);
 726                 *oldbase++ = 0;
 727                 sprintf(newexec, "%s/%s/%s", olddir,
 728                         ((wanted == 64) ? LIBARCH64NAME : ".."), oldbase);
 729                 argv[0] = newexec;
 730             }
 731 #endif /* DUAL_MODE */
 732             JLI_TraceLauncher("TRACER_MARKER:About to EXEC\n");
 733             (void) fflush(stdout);
 734             (void) fflush(stderr);
 735 #ifdef SETENV_REQUIRED
 736             if (mustsetenv) {
 737                 execve(newexec, argv, newenvp);
 738             } else {
 739                 execv(newexec, argv);
 740             }
 741 #else
 742             execv(newexec, argv);
 743 #endif /* SETENV_REQUIRED */
 744             JLI_ReportErrorMessageSys(JRE_ERROR4, newexec);
 745 
 746 #ifdef DUAL_MODE
 747             if (running != wanted) {
 748                 JLI_ReportErrorMessage(JRE_ERROR5, wanted, running);
 749 #ifdef __solaris__
 750 #ifdef __sparc
 751                 JLI_ReportErrorMessage(JRE_ERROR6);
 752 #else
 753                 JLI_ReportErrorMessage(JRE_ERROR7);
 754 #endif  /* __sparc */
 755             }
 756 #endif /* __solaris__ */
 757 #endif /* DUAL_MODE */
 758 
 759         }
 760         exit(1);
 761     }
 762 }
 763 
 764 /*
 765  * On Solaris VM choosing is done by the launcher (java.c).
 766  */
 767 static jboolean
 768 GetJVMPath(const char *jrepath, const char *jvmtype,
 769            char *jvmpath, jint jvmpathsize, const char * arch)
 770 {
 771     struct stat s;
 772 
 773     if (JLI_StrChr(jvmtype, '/')) {
 774         JLI_Snprintf(jvmpath, jvmpathsize, "%s/" JVM_DLL, jvmtype);
 775     } else {
 776         JLI_Snprintf(jvmpath, jvmpathsize, "%s/lib/%s/%s/" JVM_DLL, jrepath, arch, jvmtype);
 777     }
 778 
 779     JLI_TraceLauncher("Does `%s' exist ... ", jvmpath);
 780 
 781     if (stat(jvmpath, &s) == 0) {
 782         JLI_TraceLauncher("yes.\n");
 783         return JNI_TRUE;
 784     } else {
 785         JLI_TraceLauncher("no.\n");
 786         return JNI_FALSE;
 787     }
 788 }
 789 
 790 /*
 791  * Find path to JRE based on .exe's location or registry settings.
 792  */
 793 static jboolean
 794 GetJREPath(char *path, jint pathsize, const char * arch, jboolean speculative)
 795 {
 796     char libjava[MAXPATHLEN];
 797 
 798     if (GetApplicationHome(path, pathsize)) {
 799         /* Is JRE co-located with the application? */
 800         JLI_Snprintf(libjava, sizeof(libjava), "%s/lib/%s/" JAVA_DLL, path, arch);
 801         if (access(libjava, F_OK) == 0) {
 802             JLI_TraceLauncher("JRE path is %s\n", path);
 803             return JNI_TRUE;
 804         }
 805 
 806         /* Does the app ship a private JRE in <apphome>/jre directory? */
 807         JLI_Snprintf(libjava, sizeof(libjava), "%s/jre/lib/%s/" JAVA_DLL, path, arch);
 808         if (access(libjava, F_OK) == 0) {
 809             JLI_StrCat(path, "/jre");
 810             JLI_TraceLauncher("JRE path is %s\n", path);
 811             return JNI_TRUE;
 812         }
 813     }
 814 
 815     if (!speculative)
 816       JLI_ReportErrorMessage(JRE_ERROR8 JAVA_DLL);
 817     return JNI_FALSE;
 818 }
 819 
 820 jboolean
 821 LoadJavaVM(const char *jvmpath, InvocationFunctions *ifn)
 822 {
 823     void *libjvm;
 824 
 825     JLI_TraceLauncher("JVM path is %s\n", jvmpath);
 826 
 827     libjvm = dlopen(jvmpath, RTLD_NOW + RTLD_GLOBAL);
 828     if (libjvm == NULL) {
 829 #if defined(__solaris__) && defined(__sparc) && !defined(_LP64) /* i.e. 32-bit sparc */
 830       FILE * fp;
 831       Elf32_Ehdr elf_head;
 832       int count;
 833       int location;
 834 
 835       fp = fopen(jvmpath, "r");
 836       if (fp == NULL) {
 837         JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
 838         return JNI_FALSE;
 839       }
 840 
 841       /* read in elf header */
 842       count = fread((void*)(&elf_head), sizeof(Elf32_Ehdr), 1, fp);
 843       fclose(fp);
 844       if (count < 1) {
 845         JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
 846         return JNI_FALSE;
 847       }
 848 
 849       /*
 850        * Check for running a server vm (compiled with -xarch=v8plus)
 851        * on a stock v8 processor.  In this case, the machine type in
 852        * the elf header would not be included the architecture list
 853        * provided by the isalist command, which is turn is gotten from
 854        * sysinfo.  This case cannot occur on 64-bit hardware and thus
 855        * does not have to be checked for in binaries with an LP64 data
 856        * model.
 857        */
 858       if (elf_head.e_machine == EM_SPARC32PLUS) {
 859         char buf[257];  /* recommended buffer size from sysinfo man
 860                            page */
 861         long length;
 862         char* location;
 863 
 864         length = sysinfo(SI_ISALIST, buf, 257);
 865         if (length > 0) {
 866             location = JLI_StrStr(buf, "sparcv8plus ");
 867           if (location == NULL) {
 868             JLI_ReportErrorMessage(JVM_ERROR3);
 869             return JNI_FALSE;
 870           }
 871         }
 872       }
 873 #endif
 874         JLI_ReportErrorMessage(DLL_ERROR1, __LINE__);
 875         JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
 876         return JNI_FALSE;
 877     }
 878 
 879     ifn->CreateJavaVM = (CreateJavaVM_t)
 880         dlsym(libjvm, "JNI_CreateJavaVM");
 881     if (ifn->CreateJavaVM == NULL) {
 882         JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
 883         return JNI_FALSE;
 884     }
 885 
 886     ifn->GetDefaultJavaVMInitArgs = (GetDefaultJavaVMInitArgs_t)
 887         dlsym(libjvm, "JNI_GetDefaultJavaVMInitArgs");
 888     if (ifn->GetDefaultJavaVMInitArgs == NULL) {
 889         JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
 890         return JNI_FALSE;
 891     }
 892 
 893     return JNI_TRUE;
 894 }
 895 
 896 /*
 897  * If app is "/foo/bin/javac", or "/foo/bin/sparcv9/javac" then put
 898  * "/foo" into buf.
 899  */
 900 jboolean
 901 GetApplicationHome(char *buf, jint bufsize)
 902 {
 903     if (execname != NULL) {
 904         JLI_Snprintf(buf, bufsize, "%s", execname);
 905         buf[bufsize-1] = '\0';
 906     } else {
 907         return JNI_FALSE;
 908     }
 909 
 910     if (JLI_StrRChr(buf, '/') == 0) {
 911         buf[0] = '\0';
 912         return JNI_FALSE;
 913     }
 914     *(JLI_StrRChr(buf, '/')) = '\0';    /* executable file      */
 915     if (JLI_StrLen(buf) < 4 || JLI_StrRChr(buf, '/') == 0) {
 916         buf[0] = '\0';
 917         return JNI_FALSE;
 918     }
 919     if (JLI_StrCmp("/bin", buf + JLI_StrLen(buf) - 4) != 0)
 920         *(JLI_StrRChr(buf, '/')) = '\0';        /* sparcv9 or amd64     */
 921     if (JLI_StrLen(buf) < 4 || JLI_StrCmp("/bin", buf + JLI_StrLen(buf) - 4) != 0) {
 922         buf[0] = '\0';
 923         return JNI_FALSE;
 924     }
 925     *(JLI_StrRChr(buf, '/')) = '\0';    /* bin                  */
 926 
 927     return JNI_TRUE;
 928 }
 929 
 930 
 931 /*
 932  * Return true if the named program exists
 933  */
 934 static int
 935 ProgramExists(char *name)
 936 {
 937     struct stat sb;
 938     if (stat(name, &sb) != 0) return 0;
 939     if (S_ISDIR(sb.st_mode)) return 0;
 940     return (sb.st_mode & S_IEXEC) != 0;
 941 }
 942 
 943 
 944 /*
 945  * Find a command in a directory, returning the path.
 946  */
 947 static char *
 948 Resolve(char *indir, char *cmd)
 949 {
 950     char name[PATH_MAX + 2], *real;
 951 
 952     if ((JLI_StrLen(indir) + JLI_StrLen(cmd) + 1)  > PATH_MAX) return 0;
 953     JLI_Snprintf(name, sizeof(name), "%s%c%s", indir, FILE_SEPARATOR, cmd);
 954     if (!ProgramExists(name)) return 0;
 955     real = JLI_MemAlloc(PATH_MAX + 2);
 956     if (!realpath(name, real))
 957         JLI_StrCpy(real, name);
 958     return real;
 959 }
 960 
 961 
 962 /*
 963  * Find a path for the executable
 964  */
 965 static char *
 966 FindExecName(char *program)
 967 {
 968     char cwdbuf[PATH_MAX+2];
 969     char *path;
 970     char *tmp_path;
 971     char *f;
 972     char *result = NULL;
 973 
 974     /* absolute path? */
 975     if (*program == FILE_SEPARATOR ||
 976         (FILE_SEPARATOR=='\\' && JLI_StrRChr(program, ':')))
 977         return Resolve("", program+1);
 978 
 979     /* relative path? */
 980     if (JLI_StrRChr(program, FILE_SEPARATOR) != 0) {
 981         char buf[PATH_MAX+2];
 982         return Resolve(getcwd(cwdbuf, sizeof(cwdbuf)), program);
 983     }
 984 
 985     /* from search path? */
 986     path = getenv("PATH");
 987     if (!path || !*path) path = ".";
 988     tmp_path = JLI_MemAlloc(JLI_StrLen(path) + 2);
 989     JLI_StrCpy(tmp_path, path);
 990 
 991     for (f=tmp_path; *f && result==0; ) {
 992         char *s = f;
 993         while (*f && (*f != PATH_SEPARATOR)) ++f;
 994         if (*f) *f++ = 0;
 995         if (*s == FILE_SEPARATOR)
 996             result = Resolve(s, program);
 997         else {
 998             /* relative path element */
 999             char dir[2*PATH_MAX];
1000             JLI_Snprintf(dir, sizeof(dir), "%s%c%s", getcwd(cwdbuf, sizeof(cwdbuf)),
1001                     FILE_SEPARATOR, s);
1002             result = Resolve(dir, program);
1003         }
1004         if (result != 0) break;
1005     }
1006 
1007     JLI_MemFree(tmp_path);
1008     return result;
1009 }
1010 
1011 
1012 
1013 /*
1014  * Compute the name of the executable
1015  *
1016  * In order to re-exec securely we need the absolute path of the
1017  * executable. On Solaris getexecname(3c) may not return an absolute
1018  * path so we use dladdr to get the filename of the executable and
1019  * then use realpath to derive an absolute path. From Solaris 9
1020  * onwards the filename returned in DL_info structure from dladdr is
1021  * an absolute pathname so technically realpath isn't required.
1022  * On Linux we read the executable name from /proc/self/exe.
1023  * As a fallback, and for platforms other than Solaris and Linux,
1024  * we use FindExecName to compute the executable name.
1025  */
1026 static const char*
1027 SetExecname(char **argv)
1028 {
1029     char* exec_path = NULL;
1030 #if defined(__solaris__)
1031     {
1032         Dl_info dlinfo;
1033         int (*fptr)();
1034 
1035         fptr = (int (*)())dlsym(RTLD_DEFAULT, "main");
1036         if (fptr == NULL) {
1037             JLI_ReportErrorMessage(DLL_ERROR3, dlerror());
1038             return JNI_FALSE;
1039         }
1040 
1041         if (dladdr((void*)fptr, &dlinfo)) {
1042             char *resolved = (char*)JLI_MemAlloc(PATH_MAX+1);
1043             if (resolved != NULL) {
1044                 exec_path = realpath(dlinfo.dli_fname, resolved);
1045                 if (exec_path == NULL) {
1046                     JLI_MemFree(resolved);
1047                 }
1048             }
1049         }
1050     }
1051 #elif defined(__linux__)
1052     {
1053         const char* self = "/proc/self/exe";
1054         char buf[PATH_MAX+1];
1055         int len = readlink(self, buf, PATH_MAX);
1056         if (len >= 0) {
1057             buf[len] = '\0';            /* readlink doesn't nul terminate */
1058             exec_path = JLI_StringDup(buf);
1059         }
1060     }
1061 #else /* !__solaris__ && !__linux */
1062     {
1063         /* Not implemented */
1064     }
1065 #endif
1066 
1067     if (exec_path == NULL) {
1068         exec_path = FindExecName(argv[0]);
1069     }
1070     execname = exec_path;
1071     return exec_path;
1072 }
1073 
1074 void JLI_ReportErrorMessage(const char* fmt, ...) {
1075     va_list vl;
1076     va_start(vl, fmt);
1077     vfprintf(stderr, fmt, vl);
1078     fprintf(stderr, "\n");
1079     va_end(vl);
1080 }
1081 
1082 void JLI_ReportErrorMessageSys(const char* fmt, ...) {
1083     va_list vl;
1084     char *emsg;
1085 
1086     /*
1087      * TODO: its safer to use strerror_r but is not available on
1088      * Solaris 8. Until then....
1089      */
1090     emsg = strerror(errno);
1091     if (emsg != NULL) {
1092         fprintf(stderr, "%s\n", emsg);
1093     }
1094 
1095     va_start(vl, fmt);
1096     vfprintf(stderr, fmt, vl);
1097     fprintf(stderr, "\n");
1098     va_end(vl);
1099 }
1100 
1101 void  JLI_ReportExceptionDescription(JNIEnv * env) {
1102   (*env)->ExceptionDescribe(env);
1103 }
1104 
1105 /*
1106  *      Since using the file system as a registry is a bit risky, perform
1107  *      additional sanity checks on the identified directory to validate
1108  *      it as a valid jre/sdk.
1109  *
1110  *      Return 0 if the tests fail; otherwise return non-zero (true).
1111  *
1112  *      Note that checking for anything more than the existence of an
1113  *      executable object at bin/java relative to the path being checked
1114  *      will break the regression tests.
1115  */
1116 static int
1117 CheckSanity(char *path, char *dir)
1118 {
1119     char    buffer[PATH_MAX];
1120 
1121     if (JLI_StrLen(path) + JLI_StrLen(dir) + 11 > PATH_MAX)
1122         return (0);     /* Silently reject "impossibly" long paths */
1123 
1124     JLI_Snprintf(buffer, sizeof(buffer), "%s/%s/bin/java", path, dir);
1125     return ((access(buffer, X_OK) == 0) ? 1 : 0);
1126 }
1127 
1128 /*
1129  *      Determine if there is an acceptable JRE in the directory dirname.
1130  *      Upon locating the "best" one, return a fully qualified path to
1131  *      it. "Best" is defined as the most advanced JRE meeting the
1132  *      constraints contained in the manifest_info. If no JRE in this
1133  *      directory meets the constraints, return NULL.
1134  *
1135  *      Note that we don't check for errors in reading the directory
1136  *      (which would be done by checking errno).  This is because it
1137  *      doesn't matter if we get an error reading the directory, or
1138  *      we just don't find anything interesting in the directory.  We
1139  *      just return NULL in either case.
1140  *
1141  *      The historical names of j2sdk and j2re were changed to jdk and
1142  *      jre respecively as part of the 1.5 rebranding effort.  Since the
1143  *      former names are legacy on Linux, they must be recognized for
1144  *      all time.  Fortunately, this is a minor cost.
1145  */
1146 static char
1147 *ProcessDir(manifest_info *info, char *dirname)
1148 {
1149     DIR     *dirp;
1150     struct dirent *dp;
1151     char    *best = NULL;
1152     int     offset;
1153     int     best_offset = 0;
1154     char    *ret_str = NULL;
1155     char    buffer[PATH_MAX];
1156 
1157     if ((dirp = opendir(dirname)) == NULL)
1158         return (NULL);
1159 
1160     do {
1161         if ((dp = readdir(dirp)) != NULL) {
1162             offset = 0;
1163             if ((JLI_StrNCmp(dp->d_name, "jre", 3) == 0) ||
1164                 (JLI_StrNCmp(dp->d_name, "jdk", 3) == 0))
1165                 offset = 3;
1166             else if (JLI_StrNCmp(dp->d_name, "j2re", 4) == 0)
1167                 offset = 4;
1168             else if (JLI_StrNCmp(dp->d_name, "j2sdk", 5) == 0)
1169                 offset = 5;
1170             if (offset > 0) {
1171                 if ((JLI_AcceptableRelease(dp->d_name + offset,
1172                     info->jre_version)) && CheckSanity(dirname, dp->d_name))
1173                     if ((best == NULL) || (JLI_ExactVersionId(
1174                       dp->d_name + offset, best + best_offset) > 0)) {
1175                         if (best != NULL)
1176                             JLI_MemFree(best);
1177                         best = JLI_StringDup(dp->d_name);
1178                         best_offset = offset;
1179                     }
1180             }
1181         }
1182     } while (dp != NULL);
1183     (void) closedir(dirp);
1184     if (best == NULL)
1185         return (NULL);
1186     else {
1187         ret_str = JLI_MemAlloc(JLI_StrLen(dirname) + JLI_StrLen(best) + 2);
1188         sprintf(ret_str, "%s/%s", dirname, best);
1189         JLI_MemFree(best);
1190         return (ret_str);
1191     }
1192 }
1193 
1194 /*
1195  *      This is the global entry point. It examines the host for the optimal
1196  *      JRE to be used by scanning a set of directories.  The set of directories
1197  *      is platform dependent and can be overridden by the environment
1198  *      variable JAVA_VERSION_PATH.
1199  *
1200  *      This routine itself simply determines the set of appropriate
1201  *      directories before passing control onto ProcessDir().
1202  */
1203 char*
1204 LocateJRE(manifest_info* info)
1205 {
1206     char        *path;
1207     char        *home;
1208     char        *target = NULL;
1209     char        *dp;
1210     char        *cp;
1211 
1212     /*
1213      * Start by getting JAVA_VERSION_PATH
1214      */
1215     if (info->jre_restrict_search) {
1216         path = JLI_StringDup(system_dir);
1217     } else if ((path = getenv("JAVA_VERSION_PATH")) != NULL) {
1218         path = JLI_StringDup(path);
1219     } else {
1220         if ((home = getenv("HOME")) != NULL) {
1221             path = (char *)JLI_MemAlloc(JLI_StrLen(home) + \
1222                         JLI_StrLen(system_dir) + JLI_StrLen(user_dir) + 2);
1223             sprintf(path, "%s%s:%s", home, user_dir, system_dir);
1224         } else {
1225             path = JLI_StringDup(system_dir);
1226         }
1227     }
1228 
1229     /*
1230      * Step through each directory on the path. Terminate the scan with
1231      * the first directory with an acceptable JRE.
1232      */
1233     cp = dp = path;
1234     while (dp != NULL) {
1235         cp = JLI_StrChr(dp, (int)':');
1236         if (cp != NULL)
1237             *cp = '\0';
1238         if ((target = ProcessDir(info, dp)) != NULL)
1239             break;
1240         dp = cp;
1241         if (dp != NULL)
1242             dp++;
1243     }
1244     JLI_MemFree(path);
1245     return (target);
1246 }
1247 
1248 /*
1249  * Given a path to a jre to execute, this routine checks if this process
1250  * is indeed that jre.  If not, it exec's that jre.
1251  *
1252  * We want to actually check the paths rather than just the version string
1253  * built into the executable, so that given version specification (and
1254  * JAVA_VERSION_PATH) will yield the exact same Java environment, regardless
1255  * of the version of the arbitrary launcher we start with.
1256  */
1257 void
1258 ExecJRE(char *jre, char **argv)
1259 {
1260     char    wanted[PATH_MAX];
1261     const char* progname = GetProgramName();
1262 
1263     /*
1264      * Resolve the real path to the directory containing the selected JRE.
1265      */
1266     if (realpath(jre, wanted) == NULL) {
1267         JLI_ReportErrorMessage(JRE_ERROR9, jre);
1268         exit(1);
1269     }
1270 
1271     /*
1272      * Resolve the real path to the currently running launcher.
1273      */
1274     SetExecname(argv);
1275     if (execname == NULL) {
1276         JLI_ReportErrorMessage(JRE_ERROR10);
1277         exit(1);
1278     }
1279 
1280     /*
1281      * If the path to the selected JRE directory is a match to the initial
1282      * portion of the path to the currently executing JRE, we have a winner!
1283      * If so, just return.
1284      */
1285     if (JLI_StrNCmp(wanted, execname, JLI_StrLen(wanted)) == 0)
1286         return;                 /* I am the droid you were looking for */
1287 
1288 
1289     /*
1290      * This should never happen (because of the selection code in SelectJRE),
1291      * but check for "impossibly" long path names just because buffer overruns
1292      * can be so deadly.
1293      */
1294     if (JLI_StrLen(wanted) + JLI_StrLen(progname) + 6 > PATH_MAX) {
1295         JLI_ReportErrorMessage(JRE_ERROR11);
1296         exit(1);
1297     }
1298 
1299     /*
1300      * Construct the path and exec it.
1301      */
1302     (void)JLI_StrCat(JLI_StrCat(wanted, "/bin/"), progname);
1303     argv[0] = JLI_StringDup(progname);
1304     if (JLI_IsTraceLauncher()) {
1305         int i;
1306         printf("ReExec Command: %s (%s)\n", wanted, argv[0]);
1307         printf("ReExec Args:");
1308         for (i = 1; argv[i] != NULL; i++)
1309             printf(" %s", argv[i]);
1310         printf("\n");
1311     }
1312     JLI_TraceLauncher("TRACER_MARKER:About to EXEC\n");
1313     (void)fflush(stdout);
1314     (void)fflush(stderr);
1315     execv(wanted, argv);
1316     JLI_ReportErrorMessageSys(JRE_ERROR12, wanted);
1317     exit(1);
1318 }
1319 
1320 /*
1321  * "Borrowed" from Solaris 10 where the unsetenv() function is being added
1322  * to libc thanks to SUSv3 (Standard Unix Specification, version 3). As
1323  * such, in the fullness of time this will appear in libc on all relevant
1324  * Solaris/Linux platforms and maybe even the Windows platform.  At that
1325  * time, this stub can be removed.
1326  *
1327  * This implementation removes the environment locking for multithreaded
1328  * applications.  (We don't have access to these mutexes within libc and
1329  * the launcher isn't multithreaded.)  Note that what remains is platform
1330  * independent, because it only relies on attributes that a POSIX environment
1331  * defines.
1332  *
1333  * Returns 0 on success, -1 on failure.
1334  *
1335  * Also removed was the setting of errno.  The only value of errno set
1336  * was EINVAL ("Invalid Argument").
1337  */
1338 
1339 /*
1340  * s1(environ) is name=value
1341  * s2(name) is name(not the form of name=value).
1342  * if names match, return value of 1, else return 0
1343  */
1344 static int
1345 match_noeq(const char *s1, const char *s2)
1346 {
1347         while (*s1 == *s2++) {
1348                 if (*s1++ == '=')
1349                         return (1);
1350         }
1351         if (*s1 == '=' && s2[-1] == '\0')
1352                 return (1);
1353         return (0);
1354 }
1355 
1356 /*
1357  * added for SUSv3 standard
1358  *
1359  * Delete entry from environ.
1360  * Do not free() memory!  Other threads may be using it.
1361  * Keep it around forever.
1362  */
1363 static int
1364 borrowed_unsetenv(const char *name)
1365 {
1366         long    idx;            /* index into environ */
1367 
1368         if (name == NULL || *name == '\0' ||
1369             JLI_StrChr(name, '=') != NULL) {
1370                 return (-1);
1371         }
1372 
1373         for (idx = 0; environ[idx] != NULL; idx++) {
1374                 if (match_noeq(environ[idx], name))
1375                         break;
1376         }
1377         if (environ[idx] == NULL) {
1378                 /* name not found but still a success */
1379                 return (0);
1380         }
1381         /* squeeze up one entry */
1382         do {
1383                 environ[idx] = environ[idx+1];
1384         } while (environ[++idx] != NULL);
1385 
1386         return (0);
1387 }
1388 /* --- End of "borrowed" code --- */
1389 
1390 /*
1391  * Wrapper for unsetenv() function.
1392  */
1393 int
1394 UnsetEnv(char *name)
1395 {
1396     return(borrowed_unsetenv(name));
1397 }
1398 
1399 /* --- Splash Screen shared library support --- */
1400 
1401 static const char* SPLASHSCREEN_SO = "libsplashscreen.so";
1402 
1403 static void* hSplashLib = NULL;
1404 
1405 void* SplashProcAddress(const char* name) {
1406     if (!hSplashLib) {
1407         hSplashLib = dlopen(SPLASHSCREEN_SO, RTLD_LAZY | RTLD_GLOBAL);
1408     }
1409     if (hSplashLib) {
1410         void* sym = dlsym(hSplashLib, name);
1411         return sym;
1412     } else {
1413         return NULL;
1414     }
1415 }
1416 
1417 void SplashFreeLibrary() {
1418     if (hSplashLib) {
1419         dlclose(hSplashLib);
1420         hSplashLib = NULL;
1421     }
1422 }
1423 
1424 const char *
1425 jlong_format_specifier() {
1426     return "%lld";
1427 }
1428 
1429 
1430 
1431 /*
1432  * Block current thread and continue execution in a new thread
1433  */
1434 int
1435 ContinueInNewThread0(int (JNICALL *continuation)(void *), jlong stack_size, void * args) {
1436     int rslt;
1437 #ifdef __linux__











1438     pthread_t tid;
1439     pthread_attr_t attr;
1440     pthread_attr_init(&attr);
1441     pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
1442 
1443     if (stack_size > 0) {
1444       pthread_attr_setstacksize(&attr, stack_size);
1445     }
1446 
1447     if (pthread_create(&tid, &attr, (void *(*)(void*))continuation, (void*)args) == 0) {
1448       void * tmp;
1449       pthread_join(tid, &tmp);
1450       rslt = (int)tmp;
1451     } else {
1452      /*
1453       * Continue execution in current thread if for some reason (e.g. out of
1454       * memory/LWP)  a new thread can't be created. This will likely fail
1455       * later in continuation as JNI_CreateJavaVM needs to create quite a
1456       * few new threads, anyway, just give it a try..
1457       */
1458       rslt = continuation(args);
1459     }
1460 
1461     pthread_attr_destroy(&attr);
1462 #else
1463     thread_t tid;
1464     long flags = 0;
1465     if (thr_create(NULL, stack_size, (void *(*)(void *))continuation, args, flags, &tid) == 0) {
1466       void * tmp;
1467       thr_join(tid, NULL, &tmp);
1468       rslt = (int)tmp;
1469     } else {
1470       /* See above. Continue in current thread if thr_create() failed */
1471       rslt = continuation(args);
1472     }
1473 #endif
1474     return rslt;
1475 }
1476 
1477 /* Coarse estimation of number of digits assuming the worst case is a 64-bit pid. */
1478 #define MAX_PID_STR_SZ   20
1479 
1480 void SetJavaLauncherPlatformProps() {
1481    /* Linux only */
1482 #ifdef __linux__
1483     const char *substr = "-Dsun.java.launcher.pid=";
1484     char *pid_prop_str = (char *)JLI_MemAlloc(JLI_StrLen(substr) + MAX_PID_STR_SZ + 1);
1485     sprintf(pid_prop_str, "%s%d", substr, getpid());
1486     AddOption(pid_prop_str, NULL);
1487 #endif
1488 }
1489 
1490 jboolean
1491 IsJavaw()
1492 {
1493     /* noop on UNIX */
1494     return JNI_FALSE;
1495 }
1496 
1497 void
1498 InitLauncher(jboolean javaw)
1499 {
1500     JLI_SetTraceLauncher();
1501 }
1502 
1503 /*
1504  * The implementation for finding classes from the bootstrap
1505  * class loader, refer to java.h
1506  */
1507 static FindClassFromBootLoader_t *findBootClass = NULL;
1508 
1509 jclass
1510 FindBootStrapClass(JNIEnv *env, const char* classname)
1511 {
1512    if (findBootClass == NULL) {
1513        findBootClass = (FindClassFromBootLoader_t *)dlsym(RTLD_DEFAULT,
1514           "JVM_FindClassFromBootLoader");
1515        if (findBootClass == NULL) {
1516            JLI_ReportErrorMessage(DLL_ERROR4,
1517                "JVM_FindClassFromBootLoader");
1518            return NULL;
1519        }
1520    }
1521    return findBootClass(env, classname);
1522 }
--- EOF ---