| /* |
| * Copyright (c) 2012, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| #include "java.h" |
| |
| /* |
| * If app is "/foo/bin/javac", or "/foo/bin/sparcv9/javac" then put |
| * "/foo" into buf. |
| */ |
| jboolean |
| GetApplicationHome(char *buf, jint bufsize) |
| { |
| const char *execname = GetExecName(); |
| if (execname != NULL) { |
| JLI_Snprintf(buf, bufsize, "%s", execname); |
| 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; |
| JLI_Snprintf(name, sizeof(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 |
| */ |
| 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]; |
| JLI_Snprintf(dir, sizeof(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; |
| } |
| |
| 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 */ |
| |
| JLI_Snprintf(buffer, sizeof(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 = '\0'; |
| 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(); |
| const char* execname = NULL; |
| |
| /* |
| * 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); |
| execname = GetExecName(); |
| 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"); |
| } |
| JLI_TraceLauncher("TRACER_MARKER:About to EXEC\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)); |
| } |
| |
| const char * |
| jlong_format_specifier() { |
| return "%lld"; |
| } |
| |
| jboolean |
| IsJavaw() |
| { |
| /* noop on UNIX */ |
| return JNI_FALSE; |
| } |
| |
| void |
| InitLauncher(jboolean javaw) |
| { |
| JLI_SetTraceLauncher(); |
| } |
| |
| /* |
| * 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) { |
| JLI_ReportErrorMessage(DLL_ERROR4, |
| "JVM_FindClassFromBootLoader"); |
| return NULL; |
| } |
| } |
| return findBootClass(env, classname); |
| } |
| |
| StdArg |
| *JLI_GetStdArgs() |
| { |
| return NULL; |
| } |
| |
| int |
| JLI_GetStdArgc() { |
| return 0; |
| } |
| |
| jobjectArray |
| CreateApplicationArgs(JNIEnv *env, char **strv, int argc) |
| { |
| return NewPlatformStringArray(env, strv, argc); |
| } |
