jdk8-mips64-public/hotspot: src/os/posix/launcher/java

src/os/posix/launcher/java_md.c@e58d06a8037e (annotated)

src/os/posix/launcher/java_md.c

Tue, 21 Dec 2010 23:39:42 -0500

author: dholmes
date: Tue, 21 Dec 2010 23:39:42 -0500
changeset 2390: e58d06a8037e
parent 2369: aa6e219afbf1
child 3156: f08d439fab8c
permissions: -rw-r--r--

7008444: Remove unnecessary include of stdint.h in java_md.c
Summary: Remove unnecessary include of stdint.h in java_md.c
Reviewed-by: brutisso, kvn

 /*
  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "java.h"
 #include <dirent.h>
 #include <dlfcn.h>
 #include <fcntl.h>
 #include <inttypes.h>
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
 #include <limits.h>
 #include <sys/stat.h>
 #include <unistd.h>
 #include <sys/types.h>
 #ifndef GAMMA
 #include "manifest_info.h"
 #include "version_comp.h"
 #endif
 #ifdef __linux__
 #include <pthread.h>
 #else
 #include <thread.h>
 #endif
 #define JVM_DLL "libjvm.so"
 #define JAVA_DLL "libjava.so"
 #ifndef GAMMA   /* launcher.make defines ARCH */
 /*
  * If a processor / os combination has the ability to run binaries of
  * two data models and cohabitation of jre/jdk bits with both data
  * models is supported, then DUAL_MODE is defined.  When DUAL_MODE is
  * defined, the architecture names for the narrow and wide version of
  * the architecture are defined in LIBARCH64NAME and LIBARCH32NAME.  Currently
  * only Solaris on sparc/sparcv9 and i586/amd64 is DUAL_MODE; linux
  * i586/amd64 could be defined as DUAL_MODE but that is not the
  * current policy.
  */
 #ifndef LIBARCHNAME
 #  error "The macro LIBARCHNAME was not defined on the compile line"
 #endif
 #ifdef __sun
 #  define DUAL_MODE
 #  ifndef LIBARCH32NAME
 #    error "The macro LIBARCH32NAME was not defined on the compile line"
 #  endif
 #  ifndef LIBARCH64NAME
 #    error "The macro LIBARCH64NAME was not defined on the compile line"
 #  endif
 #  include <sys/systeminfo.h>
 #  include <sys/elf.h>
 #  include <stdio.h>
 #endif
 #endif /* ifndef GAMMA */
 /* pointer to environment */
 extern char **environ;
 #ifndef GAMMA
 /*
  *      A collection of useful strings. One should think of these as #define
  *      entries, but actual strings can be more efficient (with many compilers).
  */
 #ifdef __linux__
 static const char *system_dir   = "/usr/java";
 static const char *user_dir     = "/java";
 #else /* Solaris */
 static const char *system_dir   = "/usr/jdk";
 static const char *user_dir     = "/jdk";
 #endif
 #endif /* ifndef GAMMA */
 /*
  * Flowchart of launcher execs and options processing on unix
  *
  * The selection of the proper vm shared library to open depends on
  * several classes of command line options, including vm "flavor"
  * options (-client, -server) and the data model options, -d32  and
  * -d64, as well as a version specification which may have come from
  * the command line or from the manifest of an executable jar file.
  * The vm selection options are not passed to the running
  * virtual machine; they must be screened out by the launcher.
  *
  * The version specification (if any) is processed first by the
  * platform independent routine SelectVersion.  This may result in
  * the exec of the specified launcher version.
  *
  * Typically, the launcher execs at least once to ensure a suitable
  * LD_LIBRARY_PATH is in effect for the process.  The first exec
  * screens out all the data model options; leaving the choice of data
  * model implicit in the binary selected to run.  However, in case no
  * exec is done, the data model options are screened out before the vm
  * is invoked.
  *
  *  incoming argv ------------------------------
  *  |                                          |
  * \|/                                         |
  * CheckJVMType                                |
  * (removes -client, -server, etc.)            |
  *                                            \|/
  *                                            CreateExecutionEnvironment
  *                                            (removes -d32 and -d64,
  *                                             determines desired data model,
  *                                             sets up LD_LIBRARY_PATH,
  *                                             and exec's)
  *                                             |
  *  --------------------------------------------
  *  |
  * \|/
  * exec child 1 incoming argv -----------------
  *  |                                          |
  * \|/                                         |
  * CheckJVMType                                |
  * (removes -client, -server, etc.)            |
  *  |                                         \|/
  *  |                                          CreateExecutionEnvironment
  *  |                                          (verifies desired data model
  *  |                                           is running and acceptable
  *  |                                           LD_LIBRARY_PATH;
  *  |                                           no-op in child)
  *  |
  * \|/
  * TranslateDashJArgs...
  * (Prepare to pass args to vm)
  *  |
  *  |
  *  |
  * \|/
  * ParseArguments
  * (ignores -d32 and -d64,
  *  processes version options,
  *  creates argument list for vm,
  *  etc.)
  *
  */
 static char *SetExecname(char **argv);
 static char * GetExecname();
 static jboolean GetJVMPath(const char *jrepath, const char *jvmtype,
                            char *jvmpath, jint jvmpathsize, char * arch);
 static jboolean GetJREPath(char *path, jint pathsize, char * arch, jboolean speculative);
 #ifndef GAMMA
 const char *
 GetArch()
 {
     return LIBARCHNAME;
 }
 #endif /* ifndef GAMMA */
 void
 CreateExecutionEnvironment(int *_argcp,
                            char ***_argvp,
                            char jrepath[],
                            jint so_jrepath,
                            char jvmpath[],
                            jint so_jvmpath,
                            char **original_argv) {
   /*
    * First, determine if we are running the desired data model.  If we
    * are running the desired data model, all the error messages
    * associated with calling GetJREPath, ReadKnownVMs, etc. should be
    * output.  However, if we are not running the desired data model,
    * some of the errors should be suppressed since it is more
    * informative to issue an error message based on whether or not the
    * os/processor combination has dual mode capabilities.
    */
     char *execname = NULL;
     int original_argc = *_argcp;
     jboolean jvmpathExists;
     /* Compute the name of the executable */
     execname = SetExecname(*_argvp);
 #ifndef GAMMA
     /* Set the LD_LIBRARY_PATH environment variable, check data model
        flags, and exec process, if needed */
     {
       char *arch        = (char *)GetArch(); /* like sparc or sparcv9 */
       char * jvmtype    = NULL;
       int argc          = *_argcp;
       char **argv       = original_argv;
       char *runpath     = NULL; /* existing effective LD_LIBRARY_PATH
                                    setting */
       int running       =       /* What data model is being ILP32 =>
 bit vm; LP64 => 64 bit vm */
 #ifdef _LP64
 ;
 #else
 ;
 #endif
       int wanted        = running;      /* What data mode is being
                                            asked for? Current model is
                                            fine unless another model
                                            is asked for */
       char* new_runpath = NULL; /* desired new LD_LIBRARY_PATH string */
       char* newpath     = NULL; /* path on new LD_LIBRARY_PATH */
       char* lastslash   = NULL;
       char** newenvp    = NULL; /* current environment */
       char** newargv    = NULL;
       int    newargc    = 0;
 #ifdef __sun
       char*  dmpath     = NULL;  /* data model specific LD_LIBRARY_PATH,
                                     Solaris only */
 #endif
       /*
        * Starting in 1.5, all unix platforms accept the -d32 and -d64
        * options.  On platforms where only one data-model is supported
        * (e.g. ia-64 Linux), using the flag for the other data model is
        * an error and will terminate the program.
        */
       { /* open new scope to declare local variables */
         int i;
         newargv = (char **)JLI_MemAlloc((argc+1) * sizeof(*newargv));
         newargv[newargc++] = argv[0];
         /* scan for data model arguments and remove from argument list;
            last occurrence determines desired data model */
         for (i=1; i < argc; i++) {
           if (strcmp(argv[i], "-J-d64") == 0 || strcmp(argv[i], "-d64") == 0) {
             wanted = 64;
             continue;
           }
           if (strcmp(argv[i], "-J-d32") == 0 || strcmp(argv[i], "-d32") == 0) {
             wanted = 32;
             continue;
           }
           newargv[newargc++] = argv[i];
 #ifdef JAVA_ARGS
           if (argv[i][0] != '-')
             continue;
 #else
           if (strcmp(argv[i], "-classpath") == 0 || strcmp(argv[i], "-cp") == 0) {
             i++;
             if (i >= argc) break;
             newargv[newargc++] = argv[i];
             continue;
           }
           if (argv[i][0] != '-') { i++; break; }
 #endif
         }
         /* copy rest of args [i .. argc) */
         while (i < argc) {
           newargv[newargc++] = argv[i++];
         }
         newargv[newargc] = NULL;
         /*
          * newargv has all proper arguments here
          */
         argc = newargc;
         argv = newargv;
       }
       /* If the data model is not changing, it is an error if the
          jvmpath does not exist */
       if (wanted == running) {
         /* Find out where the JRE is that we will be using. */
         if (!GetJREPath(jrepath, so_jrepath, arch, JNI_FALSE) ) {
           fprintf(stderr, "Error: could not find Java 2 Runtime Environment.\n");
           exit(2);
         }
         /* Find the specified JVM type */
         if (ReadKnownVMs(jrepath, arch, JNI_FALSE) < 1) {
           fprintf(stderr, "Error: no known VMs. (check for corrupt jvm.cfg file)\n");
           exit(1);
         }
         jvmpath[0] = '\0';
         jvmtype = CheckJvmType(_argcp, _argvp, JNI_FALSE);
         if (!GetJVMPath(jrepath, jvmtype, jvmpath, so_jvmpath, arch )) {
           fprintf(stderr, "Error: no `%s' JVM at `%s'.\n", jvmtype, jvmpath);
           exit(4);
         }
       } else {  /* do the same speculatively or exit */
 #ifdef DUAL_MODE
         if (running != wanted) {
           /* Find out where the JRE is that we will be using. */
           if (!GetJREPath(jrepath, so_jrepath, ((wanted==64)?LIBARCH64NAME:LIBARCH32NAME), JNI_TRUE)) {
             goto EndDataModelSpeculate;
           }
           /*
            * Read in jvm.cfg for target data model and process vm
            * selection options.
            */
           if (ReadKnownVMs(jrepath, ((wanted==64)?LIBARCH64NAME:LIBARCH32NAME), JNI_TRUE) < 1) {
             goto EndDataModelSpeculate;
           }
           jvmpath[0] = '\0';
           jvmtype = CheckJvmType(_argcp, _argvp, JNI_TRUE);
           /* exec child can do error checking on the existence of the path */
           jvmpathExists = GetJVMPath(jrepath, jvmtype, jvmpath, so_jvmpath,
                                      ((wanted==64)?LIBARCH64NAME:LIBARCH32NAME));
         }
       EndDataModelSpeculate: /* give up and let other code report error message */
         ;
 #else
         fprintf(stderr, "Running a %d-bit JVM is not supported on this platform.\n", wanted);
         exit(1);
 #endif
       }
       /*
        * We will set the LD_LIBRARY_PATH as follows:
        *
        *     o          $JVMPATH (directory portion only)
        *     o          $JRE/lib/$LIBARCHNAME
        *     o          $JRE/../lib/$LIBARCHNAME
        *
        * followed by the user's previous effective LD_LIBRARY_PATH, if
        * any.
        */
 #ifdef __sun
       /*
        * Starting in Solaris 7, ld.so.1 supports three LD_LIBRARY_PATH
        * variables:
        *
        * 1. LD_LIBRARY_PATH -- used for 32 and 64 bit searches if
        * data-model specific variables are not set.
        *
        * 2. LD_LIBRARY_PATH_64 -- overrides and replaces LD_LIBRARY_PATH
        * for 64-bit binaries.
        *
        * 3. LD_LIBRARY_PATH_32 -- overrides and replaces LD_LIBRARY_PATH
        * for 32-bit binaries.
        *
        * The vm uses LD_LIBRARY_PATH to set the java.library.path system
        * property.  To shield the vm from the complication of multiple
        * LD_LIBRARY_PATH variables, if the appropriate data model
        * specific variable is set, we will act as if LD_LIBRARY_PATH had
        * the value of the data model specific variant and the data model
        * specific variant will be unset.  Note that the variable for the
        * *wanted* data model must be used (if it is set), not simply the
        * current running data model.
        */
       switch(wanted) {
       case 0:
         if(running == 32) {
           dmpath = getenv("LD_LIBRARY_PATH_32");
           wanted = 32;
         }
         else {
           dmpath = getenv("LD_LIBRARY_PATH_64");
           wanted = 64;
         }
         break;
       case 32:
         dmpath = getenv("LD_LIBRARY_PATH_32");
         break;
       case 64:
         dmpath = getenv("LD_LIBRARY_PATH_64");
         break;
       default:
         fprintf(stderr, "Improper value at line %d.", __LINE__);
         exit(1); /* unknown value in wanted */
         break;
       }
       /*
        * If dmpath is NULL, the relevant data model specific variable is
        * not set and normal LD_LIBRARY_PATH should be used.
        */
       if( dmpath == NULL) {
         runpath = getenv("LD_LIBRARY_PATH");
       }
       else {
         runpath = dmpath;
       }
 #else
       /*
        * If not on Solaris, assume only a single LD_LIBRARY_PATH
        * variable.
        */
       runpath = getenv("LD_LIBRARY_PATH");
 #endif /* __sun */
 #ifdef __linux
       /*
        * On linux, if a binary is running as sgid or suid, glibc sets
        * LD_LIBRARY_PATH to the empty string for security purposes.  (In
        * contrast, on Solaris the LD_LIBRARY_PATH variable for a
        * privileged binary does not lose its settings; but the dynamic
        * linker does apply more scrutiny to the path.) The launcher uses
        * the value of LD_LIBRARY_PATH to prevent an exec loop.
        * Therefore, if we are running sgid or suid, this function's
        * setting of LD_LIBRARY_PATH will be ineffective and we should
        * return from the function now.  Getting the right libraries to
        * be found must be handled through other mechanisms.
        */
       if((getgid() != getegid()) || (getuid() != geteuid()) ) {
         return;
       }
 #endif
       /* runpath contains current effective LD_LIBRARY_PATH setting */
       jvmpath = JLI_StringDup(jvmpath);
       new_runpath = JLI_MemAlloc( ((runpath!=NULL)?strlen(runpath):0) +
 *strlen(jrepath) + 2*strlen(arch) +
                               strlen(jvmpath) + 52);
       newpath = new_runpath + strlen("LD_LIBRARY_PATH=");
       /*
        * Create desired LD_LIBRARY_PATH value for target data model.
        */
       {
         /* remove the name of the .so from the JVM path */
         lastslash = strrchr(jvmpath, '/');
         if (lastslash)
           *lastslash = '\0';
         /* jvmpath, ((running != wanted)?((wanted==64)?"/"LIBARCH64NAME:"/.."):""), */
         sprintf(new_runpath, "LD_LIBRARY_PATH="
                 "%s:"
                 "%s/lib/%s:"
                 "%s/../lib/%s",
                 jvmpath,
 #ifdef DUAL_MODE
                 jrepath, ((wanted==64)?LIBARCH64NAME:LIBARCH32NAME),
                 jrepath, ((wanted==64)?LIBARCH64NAME:LIBARCH32NAME)
 #else
                 jrepath, arch,
                 jrepath, arch
 #endif
                 );
         /*
          * Check to make sure that the prefix of the current path is the
          * desired environment variable setting.
          */
         if (runpath != NULL &&
             strncmp(newpath, runpath, strlen(newpath))==0 &&
             (runpath[strlen(newpath)] == 0 || runpath[strlen(newpath)] == ':') &&
             (running == wanted) /* data model does not have to be changed */
 #ifdef __sun
             && (dmpath == NULL)    /* data model specific variables not set  */
 #endif
             ) {
           return;
         }
       }
       /*
        * Place the desired environment setting onto the prefix of
        * LD_LIBRARY_PATH.  Note that this prevents any possible infinite
        * loop of execv() because we test for the prefix, above.
        */
       if (runpath != 0) {
         strcat(new_runpath, ":");
         strcat(new_runpath, runpath);
       }
       if( putenv(new_runpath) != 0) {
         exit(1); /* problem allocating memory; LD_LIBRARY_PATH not set
                     properly */
       }
       /*
        * Unix systems document that they look at LD_LIBRARY_PATH only
        * once at startup, so we have to re-exec the current executable
        * to get the changed environment variable to have an effect.
        */
 #ifdef __sun
       /*
        * If dmpath is not NULL, remove the data model specific string
        * in the environment for the exec'ed child.
        */
       if( dmpath != NULL)
         (void)UnsetEnv((wanted==32)?"LD_LIBRARY_PATH_32":"LD_LIBRARY_PATH_64");
 #endif
       newenvp = environ;
       {
         char *newexec = execname;
 #ifdef DUAL_MODE
         /*
          * If the data model is being changed, the path to the
          * executable must be updated accordingly; the executable name
          * and directory the executable resides in are separate.  In the
          * case of 32 => 64, the new bits are assumed to reside in, e.g.
          * "olddir/LIBARCH64NAME/execname"; in the case of 64 => 32,
          * the bits are assumed to be in "olddir/../execname".  For example,
          *
          * olddir/sparcv9/execname
          * olddir/amd64/execname
          *
          * for Solaris SPARC and Linux amd64, respectively.
          */
         if (running != wanted) {
           char *oldexec = strcpy(JLI_MemAlloc(strlen(execname) + 1), execname);
           char *olddir = oldexec;
           char *oldbase = strrchr(oldexec, '/');
           newexec = JLI_MemAlloc(strlen(execname) + 20);
           *oldbase++ = 0;
           sprintf(newexec, "%s/%s/%s", olddir,
                   ((wanted==64) ? LIBARCH64NAME : ".."), oldbase);
           argv[0] = newexec;
         }
 #endif
         (void)fflush(stdout);
         (void)fflush(stderr);
         execve(newexec, argv, newenvp);
         perror("execve()");
         fprintf(stderr, "Error trying to exec %s.\n", newexec);
         fprintf(stderr, "Check if file exists and permissions are set correctly.\n");
 #ifdef DUAL_MODE
         if (running != wanted) {
           fprintf(stderr, "Failed to start a %d-bit JVM process from a %d-bit JVM.\n",
                   wanted, running);
 #  ifdef __sun
 #    ifdef __sparc
           fprintf(stderr, "Verify all necessary J2SE components have been installed.\n" );
           fprintf(stderr,
                   "(Solaris SPARC 64-bit components must be installed after 32-bit components.)\n" );
 #    else
           fprintf(stderr, "Either 64-bit processes are not supported by this platform\n");
           fprintf(stderr, "or the 64-bit components have not been installed.\n");
 #    endif
         }
 #  endif
 #endif
       }
       exit(1);
     }
 #else  /* ifndef GAMMA */
   /*
    * gamma launcher is simpler in that it doesn't handle VM flavors, data
    * model, LD_LIBRARY_PATH, etc. Assuming everything is set-up correctly
    * all we need to do here is to return correct path names. See also
    * GetJVMPath() and GetApplicationHome().
    */
   { char *arch = (char *) ARCH; /* like sparc or sparcv9 */
     char *p;
     if (!GetJREPath(jrepath, so_jrepath, arch, JNI_FALSE) ) {
       fprintf(stderr, "Error: could not find Java 2 Runtime Environment.\n");
       exit(2);
     }
     if (!GetJVMPath(jrepath, NULL, jvmpath, so_jvmpath, arch )) {
       fprintf(stderr, "Error: no JVM at `%s'.\n", jvmpath);
       exit(4);
     }
   }
 #endif  /* ifndef GAMMA */
 }
 /*
  * On Solaris VM choosing is done by the launcher (java.c).
  */
 static jboolean
 GetJVMPath(const char *jrepath, const char *jvmtype,
            char *jvmpath, jint jvmpathsize, char * arch)
 {
     struct stat s;
 #ifndef GAMMA
     if (strchr(jvmtype, '/')) {
         sprintf(jvmpath, "%s/" JVM_DLL, jvmtype);
     } else {
         sprintf(jvmpath, "%s/lib/%s/%s/" JVM_DLL, jrepath, arch, jvmtype);
     }
 #else
     /*
      * For gamma launcher, JVM is either built-in or in the same directory.
      * Either way we return "<exe_path>/libjvm.so" where <exe_path> is the
      * directory where gamma launcher is located.
      */
     char *p;
     snprintf(jvmpath, jvmpathsize, "%s", GetExecname());
     p = strrchr(jvmpath, '/');
     if (p) {
        /* replace executable name with libjvm.so */
        snprintf(p + 1, jvmpathsize - (p + 1 - jvmpath), "%s", JVM_DLL);
     } else {
        /* this case shouldn't happen */
        snprintf(jvmpath, jvmpathsize, "%s", JVM_DLL);
     }
 #endif /* ifndef GAMMA */
     if (_launcher_debug)
       printf("Does `%s' exist ... ", jvmpath);
     if (stat(jvmpath, &s) == 0) {
         if (_launcher_debug)
           printf("yes.\n");
         return JNI_TRUE;
     } else {
         if (_launcher_debug)
           printf("no.\n");
         return JNI_FALSE;
     }
 }
 /*
  * Find path to JRE based on .exe's location or registry settings.
  */
 static jboolean
 GetJREPath(char *path, jint pathsize, char * arch, jboolean speculative)
 {
     char libjava[MAXPATHLEN];
     if (GetApplicationHome(path, pathsize)) {
         /* Is JRE co-located with the application? */
         sprintf(libjava, "%s/lib/%s/" JAVA_DLL, path, arch);
         if (access(libjava, F_OK) == 0) {
             goto found;
         }
         /* Does the app ship a private JRE in <apphome>/jre directory? */
         sprintf(libjava, "%s/jre/lib/%s/" JAVA_DLL, path, arch);
         if (access(libjava, F_OK) == 0) {
             strcat(path, "/jre");
             goto found;
         }
     }
     if (!speculative)
       fprintf(stderr, "Error: could not find " JAVA_DLL "\n");
     return JNI_FALSE;
  found:
     if (_launcher_debug)
       printf("JRE path is %s\n", path);
     return JNI_TRUE;
 }
 jboolean
 LoadJavaVM(const char *jvmpath, InvocationFunctions *ifn)
 {
 #ifdef GAMMA
     /* JVM is directly linked with gamma launcher; no dlopen() */
     ifn->CreateJavaVM = JNI_CreateJavaVM;
     ifn->GetDefaultJavaVMInitArgs = JNI_GetDefaultJavaVMInitArgs;
     return JNI_TRUE;
 #else
    Dl_info dlinfo;
     void *libjvm;
     if (_launcher_debug) {
         printf("JVM path is %s\n", jvmpath);
     }
     libjvm = dlopen(jvmpath, RTLD_NOW + RTLD_GLOBAL);
     if (libjvm == NULL) {
 #if defined(__sparc) && !defined(_LP64) /* i.e. 32-bit sparc */
       FILE * fp;
       Elf32_Ehdr elf_head;
       int count;
       int location;
       fp = fopen(jvmpath, "r");
       if(fp == NULL)
         goto error;
       /* read in elf header */
       count = fread((void*)(&elf_head), sizeof(Elf32_Ehdr), 1, fp);
       fclose(fp);
       if(count < 1)
         goto error;
       /*
        * Check for running a server vm (compiled with -xarch=v8plus)
        * on a stock v8 processor.  In this case, the machine type in
        * the elf header would not be included the architecture list
        * provided by the isalist command, which is turn is gotten from
        * sysinfo.  This case cannot occur on 64-bit hardware and thus
        * does not have to be checked for in binaries with an LP64 data
        * model.
        */
       if(elf_head.e_machine == EM_SPARC32PLUS) {
         char buf[257];  /* recommended buffer size from sysinfo man
                            page */
         long length;
         char* location;
         length = sysinfo(SI_ISALIST, buf, 257);
         if(length > 0) {
           location = strstr(buf, "sparcv8plus ");
           if(location == NULL) {
             fprintf(stderr, "SPARC V8 processor detected; Server compiler requires V9 or better.\n");
             fprintf(stderr, "Use Client compiler on V8 processors.\n");
             fprintf(stderr, "Could not create the Java virtual machine.\n");
             return JNI_FALSE;
           }
         }
       }
 #endif
       fprintf(stderr, "dl failure on line %d", __LINE__);
       goto error;
     }
     ifn->CreateJavaVM = (CreateJavaVM_t)
       dlsym(libjvm, "JNI_CreateJavaVM");
     if (ifn->CreateJavaVM == NULL)
         goto error;
     ifn->GetDefaultJavaVMInitArgs = (GetDefaultJavaVMInitArgs_t)
         dlsym(libjvm, "JNI_GetDefaultJavaVMInitArgs");
     if (ifn->GetDefaultJavaVMInitArgs == NULL)
       goto error;
     return JNI_TRUE;
 error:
     fprintf(stderr, "Error: failed %s, because %s\n", jvmpath, dlerror());
     return JNI_FALSE;
 #endif /* ifndef GAMMA */
 }
 /*
  * If app is "/foo/bin/javac", or "/foo/bin/sparcv9/javac" then put
  * "/foo" into buf.
  */
 jboolean
 GetApplicationHome(char *buf, jint bufsize)
 {
 #ifdef __linux__
     char *execname = GetExecname();
     if (execname) {
         strncpy(buf, execname, bufsize-1);
         buf[bufsize-1] = '\0';
     } else {
         return JNI_FALSE;
     }
 #else
     Dl_info dlinfo;
     dladdr((void *)GetApplicationHome, &dlinfo);
     if (realpath(dlinfo.dli_fname, buf) == NULL) {
         fprintf(stderr, "Error: realpath(`%s') failed.\n", dlinfo.dli_fname);
         return JNI_FALSE;
     }
 #endif
 #ifdef GAMMA
     {
        /* gamma launcher uses JAVA_HOME environment variable to find JDK/JRE */
        char* java_home_var = getenv("JAVA_HOME");
        if (java_home_var == NULL) {
           printf("JAVA_HOME must point to a valid JDK/JRE to run gamma\n");
           return JNI_FALSE;
        }
        snprintf(buf, bufsize, "%s", java_home_var);
     }
 #else
     if (strrchr(buf, '/') == 0) {
         buf[0] = '\0';
         return JNI_FALSE;
     }
     *(strrchr(buf, '/')) = '\0';        /* executable file      */
     if (strlen(buf) < 4 || strrchr(buf, '/') == 0) {
         buf[0] = '\0';
         return JNI_FALSE;
     }
     if (strcmp("/bin", buf + strlen(buf) - 4) != 0)
         *(strrchr(buf, '/')) = '\0';    /* sparcv9 or amd64     */
     if (strlen(buf) < 4 || strcmp("/bin", buf + strlen(buf) - 4) != 0) {
         buf[0] = '\0';
         return JNI_FALSE;
     }
     *(strrchr(buf, '/')) = '\0';        /* bin                  */
 #endif /* ifndef GAMMA */
     return JNI_TRUE;
 }
 /*
  * Return true if the named program exists
  */
 static int
 ProgramExists(char *name)
 {
     struct stat sb;
     if (stat(name, &sb) != 0) return 0;
     if (S_ISDIR(sb.st_mode)) return 0;
     return (sb.st_mode & S_IEXEC) != 0;
 }
 /*
  * Find a command in a directory, returning the path.
  */
 static char *
 Resolve(char *indir, char *cmd)
 {
     char name[PATH_MAX + 2], *real;
     if ((strlen(indir) + strlen(cmd) + 1)  > PATH_MAX) return 0;
     sprintf(name, "%s%c%s", indir, FILE_SEPARATOR, cmd);
     if (!ProgramExists(name)) return 0;
     real = JLI_MemAlloc(PATH_MAX + 2);
     if (!realpath(name, real))
         strcpy(real, name);
     return real;
 }
 /*
  * Find a path for the executable
  */
 static char *
 FindExecName(char *program)
 {
     char cwdbuf[PATH_MAX+2];
     char *path;
     char *tmp_path;
     char *f;
     char *result = NULL;
     /* absolute path? */
     if (*program == FILE_SEPARATOR ||
         (FILE_SEPARATOR=='\\' && strrchr(program, ':')))
         return Resolve("", program+1);
     /* relative path? */
     if (strrchr(program, FILE_SEPARATOR) != 0) {
         char buf[PATH_MAX+2];
         return Resolve(getcwd(cwdbuf, sizeof(cwdbuf)), program);
     }
     /* from search path? */
     path = getenv("PATH");
     if (!path || !*path) path = ".";
     tmp_path = JLI_MemAlloc(strlen(path) + 2);
     strcpy(tmp_path, path);
     for (f=tmp_path; *f && result==0; ) {
         char *s = f;
         while (*f && (*f != PATH_SEPARATOR)) ++f;
         if (*f) *f++ = 0;
         if (*s == FILE_SEPARATOR)
             result = Resolve(s, program);
         else {
             /* relative path element */
             char dir[2*PATH_MAX];
             sprintf(dir, "%s%c%s", getcwd(cwdbuf, sizeof(cwdbuf)),
                     FILE_SEPARATOR, s);
             result = Resolve(dir, program);
         }
         if (result != 0) break;
     }
     JLI_MemFree(tmp_path);
     return result;
 }
 /* Store the name of the executable once computed */
 static char *execname = NULL;
 /*
  * Compute the name of the executable
  *
  * In order to re-exec securely we need the absolute path of the
  * executable. On Solaris getexecname(3c) may not return an absolute
  * path so we use dladdr to get the filename of the executable and
  * then use realpath to derive an absolute path. From Solaris 9
  * onwards the filename returned in DL_info structure from dladdr is
  * an absolute pathname so technically realpath isn't required.
  * On Linux we read the executable name from /proc/self/exe.
  * As a fallback, and for platforms other than Solaris and Linux,
  * we use FindExecName to compute the executable name.
  */
 static char *
 SetExecname(char **argv)
 {
     char* exec_path = NULL;
     if (execname != NULL)       /* Already determined */
         return (execname);
 #if defined(__sun)
     {
         Dl_info dlinfo;
         if (dladdr((void*)&SetExecname, &dlinfo)) {
             char *resolved = (char*)JLI_MemAlloc(PATH_MAX+1);
             if (resolved != NULL) {
                 exec_path = realpath(dlinfo.dli_fname, resolved);
                 if (exec_path == NULL) {
                     JLI_MemFree(resolved);
                 }
             }
         }
     }
 #elif defined(__linux__)
     {
         const char* self = "/proc/self/exe";
         char buf[PATH_MAX+1];
         int len = readlink(self, buf, PATH_MAX);
         if (len >= 0) {
             buf[len] = '\0';            /* readlink doesn't nul terminate */
             exec_path = JLI_StringDup(buf);
         }
     }
 #else /* !__sun && !__linux */
     {
         /* Not implemented */
     }
 #endif
     if (exec_path == NULL) {
         exec_path = FindExecName(argv[0]);
     }
     execname = exec_path;
     return exec_path;
 }
 /*
  * Return the name of the executable.  Used in java_md.c to find the JRE area.
  */
 static char *
 GetExecname() {
   return execname;
 }
 void ReportErrorMessage(char * message, jboolean always) {
   if (always) {
     fprintf(stderr, "%s\n", message);
   }
 }
 void ReportErrorMessage2(char * format, char * string, jboolean always) {
   if (always) {
     fprintf(stderr, format, string);
     fprintf(stderr, "\n");
   }
 }
 void  ReportExceptionDescription(JNIEnv * env) {
   (*env)->ExceptionDescribe(env);
 }
 /*
  * Return JNI_TRUE for an option string that has no effect but should
  * _not_ be passed on to the vm; return JNI_FALSE otherwise.  On
  * Solaris SPARC, this screening needs to be done if:
  * 1) LD_LIBRARY_PATH does _not_ need to be reset and
  * 2) -d32 or -d64 is passed to a binary with a matching data model
  *    (the exec in SetLibraryPath removes -d<n> options and points the
  *    exec to the proper binary).  When this exec is not done, these options
  *    would end up getting passed onto the vm.
  */
 jboolean RemovableMachineDependentOption(char * option) {
   /*
    * Unconditionally remove both -d32 and -d64 options since only
    * the last such options has an effect; e.g.
    * java -d32 -d64 -d32 -version
    * is equivalent to
    * java -d32 -version
    */
   if( (strcmp(option, "-d32")  == 0 ) ||
       (strcmp(option, "-d64")  == 0 ))
     return JNI_TRUE;
   else
     return JNI_FALSE;
 }
 void PrintMachineDependentOptions() {
       fprintf(stdout,
         "    -d32          use a 32-bit data model if available\n"
         "\n"
         "    -d64          use a 64-bit data model if available\n");
       return;
 }
 #ifndef GAMMA
 /*
  * The following methods (down to ServerClassMachine()) answer
  * the question about whether a machine is a "server-class"
  * machine.  A server-class machine is loosely defined as one
  * with 2 or more processors and 2 gigabytes or more physical
  * memory.  The definition of a processor is a physical package,
  * not a hyperthreaded chip masquerading as a multi-processor.
  * The definition of memory is also somewhat fuzzy, since x86
  * machines seem not to report all the memory in their DIMMs, we
  * think because of memory mapping of graphics cards, etc.
  *
  * This code is somewhat more confused with #ifdef's than we'd
  * like because this file is used by both Solaris and Linux
  * platforms, and so needs to be parameterized for SPARC and
  * i586 hardware.  The other Linux platforms (amd64 and ia64)
  * don't even ask this question, because they only come with
  * server JVMs.  */
 # define KB (1024UL)
 # define MB (1024UL * KB)
 # define GB (1024UL * MB)
 /* Compute physical memory by asking the OS */
 uint64_t
 physical_memory(void) {
   const uint64_t pages     = (uint64_t) sysconf(_SC_PHYS_PAGES);
   const uint64_t page_size = (uint64_t) sysconf(_SC_PAGESIZE);
   const uint64_t result    = pages * page_size;
 # define UINT64_FORMAT "%" PRIu64
   if (_launcher_debug) {
     printf("pages: " UINT64_FORMAT
            "  page_size: " UINT64_FORMAT
            "  physical memory: " UINT64_FORMAT " (%.3fGB)\n",
            pages, page_size, result, result / (double) GB);
   }
   return result;
 }
 #if defined(__sun) && defined(__sparc)
 /* Methods for solaris-sparc: these are easy. */
 /* Ask the OS how many processors there are. */
 unsigned long
 physical_processors(void) {
   const unsigned long sys_processors = sysconf(_SC_NPROCESSORS_CONF);
   if (_launcher_debug) {
     printf("sysconf(_SC_NPROCESSORS_CONF): %lu\n", sys_processors);
   }
   return sys_processors;
 }
 /* The solaris-sparc version of the "server-class" predicate. */
 jboolean
 solaris_sparc_ServerClassMachine(void) {
   jboolean            result            = JNI_FALSE;
   /* How big is a server class machine? */
   const unsigned long server_processors = 2UL;
   const uint64_t      server_memory     = 2UL * GB;
   const uint64_t      actual_memory     = physical_memory();
   /* Is this a server class machine? */
   if (actual_memory >= server_memory) {
     const unsigned long actual_processors = physical_processors();
     if (actual_processors >= server_processors) {
       result = JNI_TRUE;
     }
   }
   if (_launcher_debug) {
     printf("solaris_" LIBARCHNAME "_ServerClassMachine: %s\n",
            (result == JNI_TRUE ? "JNI_TRUE" : "JNI_FALSE"));
   }
   return result;
 }
 #endif /* __sun && __sparc */
 #if defined(__sun) && defined(i586)
 /*
  * A utility method for asking the CPU about itself.
  * There's a corresponding version of linux-i586
  * because the compilers are different.
  */
 void
 get_cpuid(uint32_t arg,
           uint32_t* eaxp,
           uint32_t* ebxp,
           uint32_t* ecxp,
           uint32_t* edxp) {
 #ifdef _LP64
   asm(
   /* rbx is a callee-saved register */
       " movq    %rbx, %r11  \n"
   /* rdx and rcx are 3rd and 4th argument registers */
       " movq    %rdx, %r10  \n"
       " movq    %rcx, %r9   \n"
       " movl    %edi, %eax  \n"
       " cpuid               \n"
       " movl    %eax, (%rsi)\n"
       " movl    %ebx, (%r10)\n"
       " movl    %ecx, (%r9) \n"
       " movl    %edx, (%r8) \n"
   /* Restore rbx */
       " movq    %r11, %rbx");
 #else
   /* EBX is a callee-saved register */
   asm(" pushl   %ebx");
   /* Need ESI for storing through arguments */
   asm(" pushl   %esi");
   asm(" movl    8(%ebp), %eax   \n"
       " cpuid                   \n"
       " movl    12(%ebp), %esi  \n"
       " movl    %eax, (%esi)    \n"
       " movl    16(%ebp), %esi  \n"
       " movl    %ebx, (%esi)    \n"
       " movl    20(%ebp), %esi  \n"
       " movl    %ecx, (%esi)    \n"
       " movl    24(%ebp), %esi  \n"
       " movl    %edx, (%esi)      ");
   /* Restore ESI and EBX */
   asm(" popl    %esi");
   /* Restore EBX */
   asm(" popl    %ebx");
 #endif
 }
 #endif /* __sun && i586 */
 #if defined(__linux__) && defined(i586)
 /*
  * A utility method for asking the CPU about itself.
  * There's a corresponding version of solaris-i586
  * because the compilers are different.
  */
 void
 get_cpuid(uint32_t arg,
           uint32_t* eaxp,
           uint32_t* ebxp,
           uint32_t* ecxp,
           uint32_t* edxp) {
 #ifdef _LP64
   __asm__ volatile (/* Instructions */
                     "   movl    %4, %%eax  \n"
                     "   cpuid              \n"
                     "   movl    %%eax, (%0)\n"
                     "   movl    %%ebx, (%1)\n"
                     "   movl    %%ecx, (%2)\n"
                     "   movl    %%edx, (%3)\n"
                     : /* Outputs */
                     : /* Inputs */
                     "r" (eaxp),
                     "r" (ebxp),
                     "r" (ecxp),
                     "r" (edxp),
                     "r" (arg)
                     : /* Clobbers */
                     "%rax", "%rbx", "%rcx", "%rdx", "memory"
                     );
 #else
   uint32_t value_of_eax = 0;
   uint32_t value_of_ebx = 0;
   uint32_t value_of_ecx = 0;
   uint32_t value_of_edx = 0;
   __asm__ volatile (/* Instructions */
                         /* ebx is callee-save, so push it */
                     "   pushl   %%ebx      \n"
                     "   movl    %4, %%eax  \n"
                     "   cpuid              \n"
                     "   movl    %%eax, %0  \n"
                     "   movl    %%ebx, %1  \n"
                     "   movl    %%ecx, %2  \n"
                     "   movl    %%edx, %3  \n"
                         /* restore ebx */
                     "   popl    %%ebx      \n"
                     : /* Outputs */
                     "=m" (value_of_eax),
                     "=m" (value_of_ebx),
                     "=m" (value_of_ecx),
                     "=m" (value_of_edx)
                     : /* Inputs */
                     "m" (arg)
                     : /* Clobbers */
                     "%eax", "%ecx", "%edx"
                     );
   *eaxp = value_of_eax;
   *ebxp = value_of_ebx;
   *ecxp = value_of_ecx;
   *edxp = value_of_edx;
 #endif
 }
 #endif /* __linux__ && i586 */
 #ifdef i586
 /*
  * Routines shared by solaris-i586 and linux-i586.
  */
 enum HyperThreadingSupport_enum {
   hts_supported        =  1,
   hts_too_soon_to_tell =  0,
   hts_not_supported    = -1,
   hts_not_pentium4     = -2,
   hts_not_intel        = -3
 };
 typedef enum HyperThreadingSupport_enum HyperThreadingSupport;
 /* Determine if hyperthreading is supported */
 HyperThreadingSupport
 hyperthreading_support(void) {
   HyperThreadingSupport result = hts_too_soon_to_tell;
   /* Bits 11 through 8 is family processor id */
 # define FAMILY_ID_SHIFT 8
 # define FAMILY_ID_MASK 0xf
   /* Bits 23 through 20 is extended family processor id */
 # define EXT_FAMILY_ID_SHIFT 20
 # define EXT_FAMILY_ID_MASK 0xf
   /* Pentium 4 family processor id */
 # define PENTIUM4_FAMILY_ID 0xf
   /* Bit 28 indicates Hyper-Threading Technology support */
 # define HT_BIT_SHIFT 28
 # define HT_BIT_MASK 1
   uint32_t vendor_id[3] = { 0U, 0U, 0U };
   uint32_t value_of_eax = 0U;
   uint32_t value_of_edx = 0U;
   uint32_t dummy        = 0U;
   /* Yes, this is supposed to be [0], [2], [1] */
   get_cpuid(0, &dummy, &vendor_id[0], &vendor_id[2], &vendor_id[1]);
   if (_launcher_debug) {
     printf("vendor: %c %c %c %c %c %c %c %c %c %c %c %c \n",
            ((vendor_id[0] >>  0) & 0xff),
            ((vendor_id[0] >>  8) & 0xff),
            ((vendor_id[0] >> 16) & 0xff),
            ((vendor_id[0] >> 24) & 0xff),
            ((vendor_id[1] >>  0) & 0xff),
            ((vendor_id[1] >>  8) & 0xff),
            ((vendor_id[1] >> 16) & 0xff),
            ((vendor_id[1] >> 24) & 0xff),
            ((vendor_id[2] >>  0) & 0xff),
            ((vendor_id[2] >>  8) & 0xff),
            ((vendor_id[2] >> 16) & 0xff),
            ((vendor_id[2] >> 24) & 0xff));
   }
   get_cpuid(1, &value_of_eax, &dummy, &dummy, &value_of_edx);
   if (_launcher_debug) {
     printf("value_of_eax: 0x%x  value_of_edx: 0x%x\n",
            value_of_eax, value_of_edx);
   }
   if ((((value_of_eax >> FAMILY_ID_SHIFT) & FAMILY_ID_MASK) == PENTIUM4_FAMILY_ID) ||
       (((value_of_eax >> EXT_FAMILY_ID_SHIFT) & EXT_FAMILY_ID_MASK) != 0)) {
     if ((((vendor_id[0] >>  0) & 0xff) == 'G') &&
         (((vendor_id[0] >>  8) & 0xff) == 'e') &&
         (((vendor_id[0] >> 16) & 0xff) == 'n') &&
         (((vendor_id[0] >> 24) & 0xff) == 'u') &&
         (((vendor_id[1] >>  0) & 0xff) == 'i') &&
         (((vendor_id[1] >>  8) & 0xff) == 'n') &&
         (((vendor_id[1] >> 16) & 0xff) == 'e') &&
         (((vendor_id[1] >> 24) & 0xff) == 'I') &&
         (((vendor_id[2] >>  0) & 0xff) == 'n') &&
         (((vendor_id[2] >>  8) & 0xff) == 't') &&
         (((vendor_id[2] >> 16) & 0xff) == 'e') &&
         (((vendor_id[2] >> 24) & 0xff) == 'l')) {
       if (((value_of_edx >> HT_BIT_SHIFT) & HT_BIT_MASK) == HT_BIT_MASK) {
         if (_launcher_debug) {
           printf("Hyperthreading supported\n");
         }
         result = hts_supported;
       } else {
         if (_launcher_debug) {
           printf("Hyperthreading not supported\n");
         }
         result = hts_not_supported;
       }
     } else {
       if (_launcher_debug) {
         printf("Not GenuineIntel\n");
       }
       result = hts_not_intel;
     }
   } else {
     if (_launcher_debug) {
       printf("not Pentium 4 or extended\n");
     }
     result = hts_not_pentium4;
   }
   return result;
 }
 /* Determine how many logical processors there are per CPU */
 unsigned int
 logical_processors_per_package(void) {
   /*
    * After CPUID with EAX==1, register EBX bits 23 through 16
    * indicate the number of logical processors per package
    */
 # define NUM_LOGICAL_SHIFT 16
 # define NUM_LOGICAL_MASK 0xff
   unsigned int result                        = 1U;
   const HyperThreadingSupport hyperthreading = hyperthreading_support();
   if (hyperthreading == hts_supported) {
     uint32_t value_of_ebx = 0U;
     uint32_t dummy        = 0U;
     get_cpuid(1, &dummy, &value_of_ebx, &dummy, &dummy);
     result = (value_of_ebx >> NUM_LOGICAL_SHIFT) & NUM_LOGICAL_MASK;
     if (_launcher_debug) {
       printf("logical processors per package: %u\n", result);
     }
   }
   return result;
 }
 /* Compute the number of physical processors, not logical processors */
 unsigned long
 physical_processors(void) {
   const long sys_processors = sysconf(_SC_NPROCESSORS_CONF);
   unsigned long result      = sys_processors;
   if (_launcher_debug) {
     printf("sysconf(_SC_NPROCESSORS_CONF): %lu\n", sys_processors);
   }
   if (sys_processors > 1) {
     unsigned int logical_processors = logical_processors_per_package();
     if (logical_processors > 1) {
       result = (unsigned long) sys_processors / logical_processors;
     }
   }
   if (_launcher_debug) {
     printf("physical processors: %lu\n", result);
   }
   return result;
 }
 #endif /* i586 */
 #if defined(__sun) && defined(i586)
 /* The definition of a server-class machine for solaris-i586/amd64 */
 jboolean
 solaris_i586_ServerClassMachine(void) {
   jboolean            result            = JNI_FALSE;
   /* How big is a server class machine? */
   const unsigned long server_processors = 2UL;
   const uint64_t      server_memory     = 2UL * GB;
   /*
    * We seem not to get our full complement of memory.
    *     We allow some part (1/8?) of the memory to be "missing",
    *     based on the sizes of DIMMs, and maybe graphics cards.
    */
   const uint64_t      missing_memory    = 256UL * MB;
   const uint64_t      actual_memory     = physical_memory();
   /* Is this a server class machine? */
   if (actual_memory >= (server_memory - missing_memory)) {
     const unsigned long actual_processors = physical_processors();
     if (actual_processors >= server_processors) {
       result = JNI_TRUE;
     }
   }
   if (_launcher_debug) {
     printf("solaris_" LIBARCHNAME "_ServerClassMachine: %s\n",
            (result == JNI_TRUE ? "true" : "false"));
   }
   return result;
 }
 #endif /* __sun && i586 */
 #if defined(__linux__) && defined(i586)
 /* The definition of a server-class machine for linux-i586 */
 jboolean
 linux_i586_ServerClassMachine(void) {
   jboolean            result            = JNI_FALSE;
   /* How big is a server class machine? */
   const unsigned long server_processors = 2UL;
   const uint64_t      server_memory     = 2UL * GB;
   /*
    * We seem not to get our full complement of memory.
    *     We allow some part (1/8?) of the memory to be "missing",
    *     based on the sizes of DIMMs, and maybe graphics cards.
    */
   const uint64_t      missing_memory    = 256UL * MB;
   const uint64_t      actual_memory     = physical_memory();
   /* Is this a server class machine? */
   if (actual_memory >= (server_memory - missing_memory)) {
     const unsigned long actual_processors = physical_processors();
     if (actual_processors >= server_processors) {
       result = JNI_TRUE;
     }
   }
   if (_launcher_debug) {
     printf("linux_" LIBARCHNAME "_ServerClassMachine: %s\n",
            (result == JNI_TRUE ? "true" : "false"));
   }
   return result;
 }
 #endif /* __linux__ && i586 */
 /* Dispatch to the platform-specific definition of "server-class" */
 jboolean
 ServerClassMachine(void) {
   jboolean result = JNI_FALSE;
 #if   defined(NEVER_ACT_AS_SERVER_CLASS_MACHINE)
   result = JNI_FALSE;
 #elif defined(ALWAYS_ACT_AS_SERVER_CLASS_MACHINE)
   result = JNI_TRUE;
 #elif defined(__sun) && defined(__sparc)
   result = solaris_sparc_ServerClassMachine();
 #elif defined(__sun) && defined(i586)
   result = solaris_i586_ServerClassMachine();
 #elif defined(__linux__) && defined(i586)
   result = linux_i586_ServerClassMachine();
 #else
   if (_launcher_debug) {
     printf("ServerClassMachine: returns default value of %s\n",
            (result == JNI_TRUE ? "true" : "false"));
   }
 #endif
   return result;
 }
 /*
  *      Since using the file system as a registry is a bit risky, perform
  *      additional sanity checks on the identified directory to validate
  *      it as a valid jre/sdk.
  *
  *      Return 0 if the tests fail; otherwise return non-zero (true).
  *
  *      Note that checking for anything more than the existence of an
  *      executable object at bin/java relative to the path being checked
  *      will break the regression tests.
  */
 static int
 CheckSanity(char *path, char *dir)
 {
     char    buffer[PATH_MAX];
     if (strlen(path) + strlen(dir) + 11 > PATH_MAX)
         return (0);     /* Silently reject "impossibly" long paths */
     (void)strcat(strcat(strcat(strcpy(buffer, path), "/"), dir), "/bin/java");
     return ((access(buffer, X_OK) == 0) ? 1 : 0);
 }
 /*
  *      Determine if there is an acceptable JRE in the directory dirname.
  *      Upon locating the "best" one, return a fully qualified path to
  *      it. "Best" is defined as the most advanced JRE meeting the
  *      constraints contained in the manifest_info. If no JRE in this
  *      directory meets the constraints, return NULL.
  *
  *      Note that we don't check for errors in reading the directory
  *      (which would be done by checking errno).  This is because it
  *      doesn't matter if we get an error reading the directory, or
  *      we just don't find anything interesting in the directory.  We
  *      just return NULL in either case.
  *
  *      The historical names of j2sdk and j2re were changed to jdk and
  *      jre respecively as part of the 1.5 rebranding effort.  Since the
  *      former names are legacy on Linux, they must be recognized for
  *      all time.  Fortunately, this is a minor cost.
  */
 static char
 *ProcessDir(manifest_info *info, char *dirname)
 {
     DIR     *dirp;
     struct dirent *dp;
     char    *best = NULL;
     int     offset;
     int     best_offset = 0;
     char    *ret_str = NULL;
     char    buffer[PATH_MAX];
     if ((dirp = opendir(dirname)) == NULL)
         return (NULL);
     do {
         if ((dp = readdir(dirp)) != NULL) {
             offset = 0;
             if ((strncmp(dp->d_name, "jre", 3) == 0) ||
                 (strncmp(dp->d_name, "jdk", 3) == 0))
                 offset = 3;
             else if (strncmp(dp->d_name, "j2re", 4) == 0)
                 offset = 4;
             else if (strncmp(dp->d_name, "j2sdk", 5) == 0)
                 offset = 5;
             if (offset > 0) {
                 if ((JLI_AcceptableRelease(dp->d_name + offset,
                     info->jre_version)) && CheckSanity(dirname, dp->d_name))
                     if ((best == NULL) || (JLI_ExactVersionId(
                       dp->d_name + offset, best + best_offset) > 0)) {
                         if (best != NULL)
                             JLI_MemFree(best);
                         best = JLI_StringDup(dp->d_name);
                         best_offset = offset;
                     }
             }
         }
     } while (dp != NULL);
     (void) closedir(dirp);
     if (best == NULL)
         return (NULL);
     else {
         ret_str = JLI_MemAlloc(strlen(dirname) + strlen(best) + 2);
         ret_str = strcat(strcat(strcpy(ret_str, dirname), "/"), best);
         JLI_MemFree(best);
         return (ret_str);
     }
 }
 /*
  *      This is the global entry point. It examines the host for the optimal
  *      JRE to be used by scanning a set of directories.  The set of directories
  *      is platform dependent and can be overridden by the environment
  *      variable JAVA_VERSION_PATH.
  *
  *      This routine itself simply determines the set of appropriate
  *      directories before passing control onto ProcessDir().
  */
 char*
 LocateJRE(manifest_info* info)
 {
     char        *path;
     char        *home;
     char        *target = NULL;
     char        *dp;
     char        *cp;
     /*
      * Start by getting JAVA_VERSION_PATH
      */
     if (info->jre_restrict_search)
         path = JLI_StringDup(system_dir);
     else if ((path = getenv("JAVA_VERSION_PATH")) != NULL)
         path = JLI_StringDup(path);
     else
         if ((home = getenv("HOME")) != NULL) {
             path = (char *)JLI_MemAlloc(strlen(home) + strlen(system_dir) +
                 strlen(user_dir) + 2);
             path = strcat(strcat(strcat(strcpy(path, home),
                 user_dir), ":"), system_dir);
         } else
             path = JLI_StringDup(system_dir);
     /*
      * Step through each directory on the path. Terminate the scan with
      * the first directory with an acceptable JRE.
      */
     cp = dp = path;
     while (dp != NULL) {
         cp = strchr(dp, (int)':');
         if (cp != NULL)
             *cp = (char)NULL;
         if ((target = ProcessDir(info, dp)) != NULL)
             break;
         dp = cp;
         if (dp != NULL)
             dp++;
     }
     JLI_MemFree(path);
     return (target);
 }
 /*
  * Given a path to a jre to execute, this routine checks if this process
  * is indeed that jre.  If not, it exec's that jre.
  *
  * We want to actually check the paths rather than just the version string
  * built into the executable, so that given version specification (and
  * JAVA_VERSION_PATH) will yield the exact same Java environment, regardless
  * of the version of the arbitrary launcher we start with.
  */
 void
 ExecJRE(char *jre, char **argv)
 {
     char    wanted[PATH_MAX];
     char    *execname;
     char    *progname;
     /*
      * Resolve the real path to the directory containing the selected JRE.
      */
     if (realpath(jre, wanted) == NULL) {
         fprintf(stderr, "Unable to resolve %s\n", jre);
         exit(1);
     }
     /*
      * Resolve the real path to the currently running launcher.
      */
     execname = SetExecname(argv);
     if (execname == NULL) {
         fprintf(stderr, "Unable to resolve current executable\n");
         exit(1);
     }
     /*
      * If the path to the selected JRE directory is a match to the initial
      * portion of the path to the currently executing JRE, we have a winner!
      * If so, just return.
      */
     if (strncmp(wanted, execname, strlen(wanted)) == 0)
         return;                 /* I am the droid you were looking for */
     /*
      * If this isn't the selected version, exec the selected version.
      */
 #ifdef JAVA_ARGS  /* javac, jar and friends. */
     progname = "java";
 #else             /* java, oldjava, javaw and friends */
 #ifdef PROGNAME
     progname = PROGNAME;
 #else
     progname = *argv;
     if ((s = strrchr(progname, FILE_SEPARATOR)) != 0) {
         progname = s + 1;
     }
 #endif /* PROGNAME */
 #endif /* JAVA_ARGS */
     /*
      * This should never happen (because of the selection code in SelectJRE),
      * but check for "impossibly" long path names just because buffer overruns
      * can be so deadly.
      */
     if (strlen(wanted) + strlen(progname) + 6 > PATH_MAX) {
         fprintf(stderr, "Path length exceeds maximum length (PATH_MAX)\n");
         exit(1);
     }
     /*
      * Construct the path and exec it.
      */
     (void)strcat(strcat(wanted, "/bin/"), progname);
     argv[0] = progname;
     if (_launcher_debug) {
         int i;
         printf("ReExec Command: %s (%s)\n", wanted, argv[0]);
         printf("ReExec Args:");
         for (i = 1; argv[i] != NULL; i++)
             printf(" %s", argv[i]);
         printf("\n");
     }
     (void)fflush(stdout);
     (void)fflush(stderr);
     execv(wanted, argv);
     perror("execv()");
     fprintf(stderr, "Exec of %s failed\n", wanted);
     exit(1);
 }
 #endif /* ifndef GAMMA */
 /*
  * "Borrowed" from Solaris 10 where the unsetenv() function is being added
  * to libc thanks to SUSv3 (Standard Unix Specification, version 3). As
  * such, in the fullness of time this will appear in libc on all relevant
  * Solaris/Linux platforms and maybe even the Windows platform.  At that
  * time, this stub can be removed.
  *
  * This implementation removes the environment locking for multithreaded
  * applications.  (We don't have access to these mutexes within libc and
  * the launcher isn't multithreaded.)  Note that what remains is platform
  * independent, because it only relies on attributes that a POSIX environment
  * defines.
  *
  * Returns 0 on success, -1 on failure.
  *
  * Also removed was the setting of errno.  The only value of errno set
  * was EINVAL ("Invalid Argument").
  */
 /*
  * s1(environ) is name=value
  * s2(name) is name(not the form of name=value).
  * if names match, return value of 1, else return 0
  */
 static int
 match_noeq(const char *s1, const char *s2)
 {
         while (*s1 == *s2++) {
                 if (*s1++ == '=')
                         return (1);
         }
         if (*s1 == '=' && s2[-1] == '\0')
                 return (1);
         return (0);
 }
 /*
  * added for SUSv3 standard
  *
  * Delete entry from environ.
  * Do not free() memory!  Other threads may be using it.
  * Keep it around forever.
  */
 static int
 borrowed_unsetenv(const char *name)
 {
         long    idx;            /* index into environ */
         if (name == NULL || *name == '\0' ||
             strchr(name, '=') != NULL) {
                 return (-1);
         }
         for (idx = 0; environ[idx] != NULL; idx++) {
                 if (match_noeq(environ[idx], name))
                         break;
         }
         if (environ[idx] == NULL) {
                 /* name not found but still a success */
                 return (0);
         }
         /* squeeze up one entry */
         do {
                 environ[idx] = environ[idx+1];
         } while (environ[++idx] != NULL);
         return (0);
 }
 /* --- End of "borrowed" code --- */
 /*
  * Wrapper for unsetenv() function.
  */
 int
 UnsetEnv(char *name)
 {
     return(borrowed_unsetenv(name));
 }
 /* --- Splash Screen shared library support --- */
 static const char* SPLASHSCREEN_SO = "libsplashscreen.so";
 static void* hSplashLib = NULL;
 void* SplashProcAddress(const char* name) {
     if (!hSplashLib) {
         hSplashLib = dlopen(SPLASHSCREEN_SO, RTLD_LAZY | RTLD_GLOBAL);
     }
     if (hSplashLib) {
         void* sym = dlsym(hSplashLib, name);
         return sym;
     } else {
         return NULL;
     }
 }
 void SplashFreeLibrary() {
     if (hSplashLib) {
         dlclose(hSplashLib);
         hSplashLib = NULL;
     }
 }
 const char *
 jlong_format_specifier() {
     return "%lld";
 }
 /*
  * Block current thread and continue execution in a new thread
  */
 int
 ContinueInNewThread(int (JNICALL *continuation)(void *), jlong stack_size, void * args) {
     int rslt;
 #ifdef __linux__
     pthread_t tid;
     pthread_attr_t attr;
     pthread_attr_init(&attr);
     pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
     if (stack_size > 0) {
       pthread_attr_setstacksize(&attr, stack_size);
     }
     if (pthread_create(&tid, &attr, (void *(*)(void*))continuation, (void*)args) == 0) {
       void * tmp;
       pthread_join(tid, &tmp);
       rslt = (int)(intptr_t)tmp;
     } else {
      /*
       * Continue execution in current thread if for some reason (e.g. out of
       * memory/LWP)  a new thread can't be created. This will likely fail
       * later in continuation as JNI_CreateJavaVM needs to create quite a
       * few new threads, anyway, just give it a try..
       */
       rslt = continuation(args);
     }
     pthread_attr_destroy(&attr);
 #else
     thread_t tid;
     long flags = 0;
     if (thr_create(NULL, stack_size, (void *(*)(void *))continuation, args, flags, &tid) == 0) {
       void * tmp;
       thr_join(tid, NULL, &tmp);
       rslt = (int)(intptr_t)tmp;
     } else {
       /* See above. Continue in current thread if thr_create() failed */
       rslt = continuation(args);
     }
 #endif
     return rslt;
 }
 /* Coarse estimation of number of digits assuming the worst case is a 64-bit pid. */
 #define MAX_PID_STR_SZ   20
 void SetJavaLauncherPlatformProps() {
    /* Linux only */
 #ifdef __linux__
     const char *substr = "-Dsun.java.launcher.pid=";
     char *pid_prop_str = (char *)JLI_MemAlloc(strlen(substr) + MAX_PID_STR_SZ + 1);
     sprintf(pid_prop_str, "%s%d", substr, getpid());
     AddOption(pid_prop_str, NULL);
 #endif
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/os/posix/launcher/java_md.c@e58d06a8037e (annotated)

src/os/posix/launcher/java_md.c