/* * 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. * * 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. * */ /* * Gamma (Hotspot internal engineering test) launcher based on 1.6.0-b28 JDK, * search "GAMMA" for gamma specific changes. */ #include "java.h" #include #include #include #include #include #include #include #include #include #include #include #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" # 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 # include # include #else # ifndef ARCH # include # 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 "/libjvm.so" where 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 /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 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 not load method JVM_FindClassFromBootLoader"); return NULL; } } return findBootClass(env, classname, JNI_FALSE); }