6953477: Increase portability and flexibility of building Hotspot
Summary: A collection of portability improvements including shared code support for PPC, ARM platforms, software floating point, cross compilation support and improvements in error crash detail.
Reviewed-by: phh, never, coleenp, dholmes
/*
* Copyright (c) 1999, 2008, 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.
*
*/
/*
* Gamma (Hotspot internal engineering test) launcher based on 1.6.0-b28 JDK,
* search "GAMMA" for gamma specific changes.
*/
#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
#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 BIG_ARCH and SMALL_ARCH. 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.
*/
#ifdef _LP64
# ifdef ia64
# define ARCH "ia64"
# elif defined(amd64)
# define ARCH "amd64"
# elif defined(__sparc)
# define ARCH "sparcv9"
# else
# define ARCH "unknown" /* unknown 64-bit architecture */
# endif
#else /* 32-bit data model */
# ifdef i586
# define ARCH "i386"
# elif defined(__sparc)
# define ARCH "sparc"
# elif defined(arm)
# define ARCH "arm"
# elif defined(PPC)
# define ARCH "ppc"
# endif
#endif /* _LP64 */
#ifdef __sun
# define DUAL_MODE
# ifdef __sparc
# define BIG_ARCH "sparcv9"
# define SMALL_ARCH "sparc"
# else
# define BIG_ARCH "amd64"
# define SMALL_ARCH "i386"
# endif
# include <sys/systeminfo.h>
# include <sys/elf.h>
# include <stdio.h>
#else
# ifndef ARCH
# include <sys/systeminfo.h>
# endif
#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);
const char *
GetArch()
{
static char *arch = NULL;
static char buf[12];
if (arch) {
return arch;
}
#ifdef ARCH
strcpy(buf, ARCH);
#else
sysinfo(SI_ARCHITECTURE, buf, sizeof(buf));
#endif
arch = buf;
return arch;
}
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 =>
32 bit vm; LP64 => 64 bit vm */
#ifdef _LP64
64;
#else
32;
#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 **)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)?BIG_ARCH:SMALL_ARCH), JNI_TRUE)) {
goto EndDataModelSpeculate;
}
/*
* Read in jvm.cfg for target data model and process vm
* selection options.
*/
if (ReadKnownVMs(jrepath, ((wanted==64)?BIG_ARCH:SMALL_ARCH), 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)?BIG_ARCH:SMALL_ARCH));
}
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 $JRE/lib/$ARCH
* o $JRE/../lib/$ARCH
*
* 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 = strdup(jvmpath);
new_runpath = MemAlloc( ((runpath!=NULL)?strlen(runpath):0) +
2*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)?"/"BIG_ARCH:"/.."):""), */
sprintf(new_runpath, "LD_LIBRARY_PATH="
"%s:"
"%s/lib/%s:"
"%s/../lib/%s",
jvmpath,
#ifdef DUAL_MODE
jrepath, ((wanted==64)?BIG_ARCH:SMALL_ARCH),
jrepath, ((wanted==64)?BIG_ARCH:SMALL_ARCH)
#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/BIGARCH/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(MemAlloc(strlen(execname) + 1), execname);
char *olddir = oldexec;
char *oldbase = strrchr(oldexec, '/');
newexec = MemAlloc(strlen(execname) + 20);
*oldbase++ = 0;
sprintf(newexec, "%s/%s/%s", olddir,
((wanted==64) ? BIG_ARCH : ".."), oldbase);
argv[0] = newexec;
}
#endif
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 *)GetArch(); /* 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
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 /* GAMMA */
}
/*
* Get the path to the file that has the usage message for -X options.
*/
void
GetXUsagePath(char *buf, jint bufsize)
{
static const char Xusage_txt[] = "/Xusage.txt";
Dl_info dlinfo;
/* we use RTLD_NOW because of problems with ld.so.1 and green threads */
dladdr(dlsym(dlopen(JVM_DLL, RTLD_NOW), "JNI_CreateJavaVM"), &dlinfo);
strncpy(buf, (char *)dlinfo.dli_fname, bufsize - sizeof(Xusage_txt));
buf[bufsize-1] = '\0';
strcpy(strrchr(buf, '/'), Xusage_txt);
}
/*
* 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 /* 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 = 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 = 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;
}
free(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*)MemAlloc(PATH_MAX+1);
if (resolved != NULL) {
exec_path = realpath(dlinfo.dli_fname, resolved);
if (exec_path == NULL) {
free(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 = strdup(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 /* gamma launcher does not have ergonomics */
/*
* 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_" ARCH "_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 */
/* even though it's in the clobbers section */
" 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", "%ebx", "%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_" ARCH "_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_" ARCH "_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(__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;
}
#endif /* ifndef GAMMA */
#ifndef GAMMA /* gamma launcher does not choose JDK/JRE/JVM */
/*
* 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 ((acceptable_release(dp->d_name + offset,
info->jre_version)) && CheckSanity(dirname, dp->d_name))
if ((best == NULL) || (exact_version_id(
dp->d_name + offset, best + best_offset) > 0)) {
if (best != NULL)
free(best);
best = strdup(dp->d_name);
best_offset = offset;
}
}
}
} while (dp != NULL);
(void) closedir(dirp);
if (best == NULL)
return (NULL);
else {
ret_str = MemAlloc(strlen(dirname) + strlen(best) + 2);
ret_str = strcat(strcat(strcpy(ret_str, dirname), "/"), best);
free(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 = strdup(system_dir);
else if ((path = getenv("JAVA_VERSION_PATH")) != NULL)
path = strdup(path);
else
if ((home = getenv("HOME")) != NULL) {
path = (char *)MemAlloc(strlen(home) + 13);
path = strcat(strcat(strcat(strcpy(path, home),
user_dir), ":"), system_dir);
} else
path = strdup(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++;
}
free(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("execv(\"%s\"", wanted);
for (i = 0; argv[i] != NULL; i++)
printf(", \"%s\"", argv[i]);
printf(")\n");
}
execv(wanted, argv);
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));
}
/*
* The implementation for finding classes from the bootstrap
* class loader, refer to java.h
*/
static FindClassFromBootLoader_t *findBootClass = NULL;
jclass
FindBootStrapClass(JNIEnv *env, const char* classname)
{
if (findBootClass == NULL) {
findBootClass = (FindClassFromBootLoader_t *)dlsym(RTLD_DEFAULT,
"JVM_FindClassFromBootLoader");
if (findBootClass == NULL) {
fprintf(stderr, "Error: could load method JVM_FindClassFromBootLoader");
return NULL;
}
}
return findBootClass(env, classname, JNI_FALSE);
}