6685121: (launcher) make ReportErrorMessages accessible by other launcher subsystems
Summary: provided error reporting interfaces to other java subsystems that the launcher uses.
Reviewed-by: darcy
/*
* Copyright 1998-2008 Sun Microsystems, Inc. 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. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun in the LICENSE file that accompanied this code.
*
* 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.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 <sys/stat.h>
#include <unistd.h>
#include <sys/types.h>
#include "manifest_info.h"
#include "version_comp.h"
#ifdef __linux__
#include <pthread.h>
#else
#include <thread.h>
#endif
#define JVM_DLL "libjvm.so"
#define JAVA_DLL "libjava.so"
/*
* 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.
*/
#ifdef __solaris__
# 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
/* pointer to environment */
extern char **environ;
/*
* 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
/* Store the name of the executable once computed */
static char *execname = NULL;
/*
* 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 const char * SetExecname(char **argv);
static jboolean GetJVMPath(const char *jrepath, const char *jvmtype,
char *jvmpath, jint jvmpathsize, const char * arch);
static jboolean GetJREPath(char *path, jint pathsize, const char * arch, jboolean speculative);
#define GetArch() GetArchPath(CURRENT_DATA_MODEL)
const char *
GetArchPath(int nbits)
{
switch(nbits) {
#ifdef DUAL_MODE
case 32:
return LIBARCH32NAME;
case 64:
return LIBARCH64NAME;
#endif /* DUAL_MODE */
default:
return LIBARCHNAME;
}
}
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.
*/
int original_argc = *_argcp;
jboolean jvmpathExists;
/* Compute/set the name of the executable */
SetExecname(*_argvp);
/* 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 = CURRENT_DATA_MODEL;
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 __solaris__
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 (JLI_StrCmp(argv[i], "-J-d64") == 0 || JLI_StrCmp(argv[i], "-d64") == 0) {
wanted = 64;
continue;
}
if (JLI_StrCmp(argv[i], "-J-d32") == 0 || JLI_StrCmp(argv[i], "-d32") == 0) {
wanted = 32;
continue;
}
newargv[newargc++] = argv[i];
if (IsJavaArgs()) {
if (argv[i][0] != '-') continue;
} else {
if (JLI_StrCmp(argv[i], "-classpath") == 0 || JLI_StrCmp(argv[i], "-cp") == 0) {
i++;
if (i >= argc) break;
newargv[newargc++] = argv[i];
continue;
}
if (argv[i][0] != '-') { i++; break; }
}
}
/* 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) ) {
JLI_ReportErrorMessage(JRE_ERROR1);
exit(2);
}
/* Find the specified JVM type */
if (ReadKnownVMs(jrepath, arch, JNI_FALSE) < 1) {
JLI_ReportErrorMessage(CFG_ERROR7);
exit(1);
}
jvmpath[0] = '\0';
jvmtype = CheckJvmType(_argcp, _argvp, JNI_FALSE);
if (!GetJVMPath(jrepath, jvmtype, jvmpath, so_jvmpath, arch )) {
JLI_ReportErrorMessage(CFG_ERROR8, 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, GetArchPath(wanted), JNI_TRUE)) {
goto EndDataModelSpeculate;
}
/*
* Read in jvm.cfg for target data model and process vm
* selection options.
*/
if (ReadKnownVMs(jrepath, GetArchPath(wanted), 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, GetArchPath(wanted));
}
EndDataModelSpeculate: /* give up and let other code report error message */
;
#else
JLI_ReportErrorMessage(JRE_ERROR2, 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 __solaris__
/*
* 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:
JLI_ReportErrorMessage(JRE_ERROR3, __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 /* __solaris__ */
#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)?JLI_StrLen(runpath):0) +
2*JLI_StrLen(jrepath) + 2*JLI_StrLen(arch) +
JLI_StrLen(jvmpath) + 52);
newpath = new_runpath + JLI_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 = JLI_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, GetArchPath(wanted),
jrepath, GetArchPath(wanted)
#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 &&
JLI_StrNCmp(newpath, runpath, JLI_StrLen(newpath))==0 &&
(runpath[JLI_StrLen(newpath)] == 0 || runpath[JLI_StrLen(newpath)] == ':') &&
(running == wanted) /* data model does not have to be changed */
#ifdef __solaris__
&& (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) {
JLI_StrCat(new_runpath, ":");
JLI_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 __solaris__
/*
* 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 = JLI_StrCpy(JLI_MemAlloc(JLI_StrLen(execname) + 1), execname);
char *olddir = oldexec;
char *oldbase = JLI_StrRChr(oldexec, '/');
newexec = JLI_MemAlloc(JLI_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);
JLI_ReportErrorMessageSys(JRE_ERROR4, newexec);
#ifdef DUAL_MODE
if (running != wanted) {
JLI_ReportErrorMessage(JRE_ERROR5, wanted, running);
# ifdef __solaris__
# ifdef __sparc
JLI_ReportErrorMessage(JRE_ERROR6);
# else
JLI_ReportErrorMessage(JRE_ERROR7);
# endif
}
# endif
#endif
}
exit(1);
}
}
/*
* On Solaris VM choosing is done by the launcher (java.c).
*/
static jboolean
GetJVMPath(const char *jrepath, const char *jvmtype,
char *jvmpath, jint jvmpathsize, const char * arch)
{
struct stat s;
if (JLI_StrChr(jvmtype, '/')) {
sprintf(jvmpath, "%s/" JVM_DLL, jvmtype);
} else {
sprintf(jvmpath, "%s/lib/%s/%s/" JVM_DLL, jrepath, arch, jvmtype);
}
JLI_TraceLauncher("Does `%s' exist ... ", jvmpath);
if (stat(jvmpath, &s) == 0) {
JLI_TraceLauncher("yes.\n");
return JNI_TRUE;
} else {
JLI_TraceLauncher("no.\n");
return JNI_FALSE;
}
}
/*
* Find path to JRE based on .exe's location or registry settings.
*/
static jboolean
GetJREPath(char *path, jint pathsize, const 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) {
JLI_StrCat(path, "/jre");
goto found;
}
}
if (!speculative)
JLI_ReportErrorMessage(JRE_ERROR8 JAVA_DLL);
return JNI_FALSE;
found:
JLI_TraceLauncher("JRE path is %s\n", path);
return JNI_TRUE;
}
jboolean
LoadJavaVM(const char *jvmpath, InvocationFunctions *ifn)
{
Dl_info dlinfo;
void *libjvm;
JLI_TraceLauncher("JVM path is %s\n", jvmpath);
libjvm = dlopen(jvmpath, RTLD_NOW + RTLD_GLOBAL);
if (libjvm == NULL) {
#if defined(__solaris__) && 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 = JLI_StrStr(buf, "sparcv8plus ");
if(location == NULL) {
JLI_ReportErrorMessage(JVM_ERROR3);
return JNI_FALSE;
}
}
}
#endif
JLI_ReportErrorMessage(DLL_ERROR1, __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:
JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror());
return JNI_FALSE;
}
/*
* If app is "/foo/bin/javac", or "/foo/bin/sparcv9/javac" then put
* "/foo" into buf.
*/
jboolean
GetApplicationHome(char *buf, jint bufsize)
{
if (execname != NULL) {
JLI_StrNCpy(buf, execname, bufsize-1);
buf[bufsize-1] = '\0';
} else {
return JNI_FALSE;
}
if (JLI_StrRChr(buf, '/') == 0) {
buf[0] = '\0';
return JNI_FALSE;
}
*(JLI_StrRChr(buf, '/')) = '\0'; /* executable file */
if (JLI_StrLen(buf) < 4 || JLI_StrRChr(buf, '/') == 0) {
buf[0] = '\0';
return JNI_FALSE;
}
if (JLI_StrCmp("/bin", buf + JLI_StrLen(buf) - 4) != 0)
*(JLI_StrRChr(buf, '/')) = '\0'; /* sparcv9 or amd64 */
if (JLI_StrLen(buf) < 4 || JLI_StrCmp("/bin", buf + JLI_StrLen(buf) - 4) != 0) {
buf[0] = '\0';
return JNI_FALSE;
}
*(JLI_StrRChr(buf, '/')) = '\0'; /* bin */
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 ((JLI_StrLen(indir) + JLI_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))
JLI_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=='\\' && JLI_StrRChr(program, ':')))
return Resolve("", program+1);
/* relative path? */
if (JLI_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(JLI_StrLen(path) + 2);
JLI_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;
}
/*
* 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 const char*
SetExecname(char **argv)
{
char* exec_path = NULL;
#if defined(__solaris__)
{
Dl_info dlinfo;
int (*fptr)();
fptr = (int (*)())dlsym(RTLD_DEFAULT, "main");
if (fptr == NULL) {
JLI_ReportErrorMessage(DLL_ERROR3, dlerror());
return JNI_FALSE;
}
if (dladdr((void*)fptr, &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 /* !__solaris__ && !__linux */
{
/* Not implemented */
}
#endif
if (exec_path == NULL) {
exec_path = FindExecName(argv[0]);
}
execname = exec_path;
return exec_path;
}
void JLI_ReportErrorMessage(const char* fmt, ...) {
va_list vl;
va_start(vl, fmt);
vfprintf(stderr, fmt, vl);
fprintf(stderr, "\n");
va_end(vl);
}
void JLI_ReportErrorMessageSys(const char* fmt, ...) {
va_list vl;
char *emsg;
/*
* TODO: its safer to use strerror_r but is not available on
* Solaris 8. Until then....
*/
emsg = strerror(errno);
if (emsg != NULL) {
fprintf(stderr, "%s\n", emsg);
}
va_start(vl, fmt);
vfprintf(stderr, fmt, vl);
fprintf(stderr, "\n");
va_end(vl);
}
void JLI_ReportExceptionDescription(JNIEnv * env) {
(*env)->ExceptionDescribe(env);
}
/*
* 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 (JLI_StrLen(path) + JLI_StrLen(dir) + 11 > PATH_MAX)
return (0); /* Silently reject "impossibly" long paths */
sprintf(buffer, "%s/%s/bin/java", path, dir);
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 ((JLI_StrNCmp(dp->d_name, "jre", 3) == 0) ||
(JLI_StrNCmp(dp->d_name, "jdk", 3) == 0))
offset = 3;
else if (JLI_StrNCmp(dp->d_name, "j2re", 4) == 0)
offset = 4;
else if (JLI_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(JLI_StrLen(dirname) + JLI_StrLen(best) + 2);
sprintf(ret_str, "%s/%s", 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(JLI_StrLen(home) + \
JLI_StrLen(system_dir) + JLI_StrLen(user_dir) + 2);
sprintf(path, "%s%s:%s", 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 = JLI_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];
const char* progname = GetProgramName();
/*
* Resolve the real path to the directory containing the selected JRE.
*/
if (realpath(jre, wanted) == NULL) {
JLI_ReportErrorMessage(JRE_ERROR9, jre);
exit(1);
}
/*
* Resolve the real path to the currently running launcher.
*/
SetExecname(argv);
if (execname == NULL) {
JLI_ReportErrorMessage(JRE_ERROR10);
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 (JLI_StrNCmp(wanted, execname, JLI_StrLen(wanted)) == 0)
return; /* I am the droid you were looking for */
/*
* 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 (JLI_StrLen(wanted) + JLI_StrLen(progname) + 6 > PATH_MAX) {
JLI_ReportErrorMessage(JRE_ERROR11);
exit(1);
}
/*
* Construct the path and exec it.
*/
(void)JLI_StrCat(JLI_StrCat(wanted, "/bin/"), progname);
argv[0] = JLI_StringDup(progname);
if (JLI_IsTraceLauncher()) {
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);
JLI_ReportErrorMessageSys(JRE_ERROR12, wanted);
exit(1);
}
/*
* "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' ||
JLI_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
ContinueInNewThread0(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)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)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(JLI_StrLen(substr) + MAX_PID_STR_SZ + 1);
sprintf(pid_prop_str, "%s%d", substr, getpid());
AddOption(pid_prop_str, NULL);
#endif
}
jboolean
IsJavaw()
{
/* noop on UNIX */
return JNI_FALSE;
}
void
InitLauncher(jboolean javaw)
{
JLI_SetTraceLauncher();
}