--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/solaris/native/java/lang/UNIXProcess_md.c Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,645 @@
+/*
+ * Copyright 1995-2006 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.
+ */
+
+#undef _LARGEFILE64_SOURCE
+#define _LARGEFILE64_SOURCE 1
+
+#include "jni.h"
+#include "jvm.h"
+#include "jvm_md.h"
+#include "jni_util.h"
+#include "io_util.h"
+
+/*
+ * Platform-specific support for java.lang.Process
+ */
+#include <assert.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <ctype.h>
+#include <wait.h>
+#include <signal.h>
+#include <string.h>
+#include <errno.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <limits.h>
+
+#ifndef STDIN_FILENO
+#define STDIN_FILENO 0
+#endif
+
+#ifndef STDOUT_FILENO
+#define STDOUT_FILENO 1
+#endif
+
+#ifndef STDERR_FILENO
+#define STDERR_FILENO 2
+#endif
+
+#ifndef SA_NOCLDSTOP
+#define SA_NOCLDSTOP 0
+#endif
+
+#ifndef SA_RESTART
+#define SA_RESTART 0
+#endif
+
+#define FAIL_FILENO (STDERR_FILENO + 1)
+
+static void
+setSIGCHLDHandler(JNIEnv *env)
+{
+ /* There is a subtle difference between having the signal handler
+ * for SIGCHLD be SIG_DFL and SIG_IGN. We cannot obtain process
+ * termination information for child processes if the signal
+ * handler is SIG_IGN. It must be SIG_DFL.
+ *
+ * We used to set the SIGCHLD handler only on Linux, but it's
+ * safest to set it unconditionally.
+ *
+ * Consider what happens if java's parent process sets the SIGCHLD
+ * handler to SIG_IGN. Normally signal handlers are inherited by
+ * children, but SIGCHLD is a controversial case. Solaris appears
+ * to always reset it to SIG_DFL, but this behavior may be
+ * non-standard-compliant, and we shouldn't rely on it.
+ *
+ * References:
+ * http://www.opengroup.org/onlinepubs/7908799/xsh/exec.html
+ * http://www.pasc.org/interps/unofficial/db/p1003.1/pasc-1003.1-132.html
+ */
+ struct sigaction sa;
+ sa.sa_handler = SIG_DFL;
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = SA_NOCLDSTOP | SA_RESTART;
+ if (sigaction(SIGCHLD, &sa, NULL) < 0)
+ JNU_ThrowInternalError(env, "Can't set SIGCHLD handler");
+}
+
+static void*
+xmalloc(JNIEnv *env, size_t size)
+{
+ void *p = malloc(size);
+ if (p == NULL)
+ JNU_ThrowOutOfMemoryError(env, NULL);
+ return p;
+}
+
+#define NEW(type, n) ((type *) xmalloc(env, (n) * sizeof(type)))
+
+/**
+ * If PATH is not defined, the OS provides some default value.
+ * Unfortunately, there's no portable way to get this value.
+ * Fortunately, it's only needed if the child has PATH while we do not.
+ */
+static const char*
+defaultPath(void)
+{
+#ifdef __solaris__
+ /* These really are the Solaris defaults! */
+ return (geteuid() == 0 || getuid() == 0) ?
+ "/usr/xpg4/bin:/usr/ccs/bin:/usr/bin:/opt/SUNWspro/bin:/usr/sbin" :
+ "/usr/xpg4/bin:/usr/ccs/bin:/usr/bin:/opt/SUNWspro/bin:";
+#else
+ return ":/bin:/usr/bin"; /* glibc */
+#endif
+}
+
+static const char*
+effectivePath(void)
+{
+ const char *s = getenv("PATH");
+ return (s != NULL) ? s : defaultPath();
+}
+
+static int
+countOccurrences(const char *s, char c)
+{
+ int count;
+ for (count = 0; *s != '\0'; s++)
+ count += (*s == c);
+ return count;
+}
+
+static const char * const *
+splitPath(JNIEnv *env, const char *path)
+{
+ const char *p, *q;
+ char **pathv;
+ int i;
+ int count = countOccurrences(path, ':') + 1;
+
+ pathv = NEW(char*, count+1);
+ pathv[count] = NULL;
+ for (p = path, i = 0; i < count; i++, p = q + 1) {
+ for (q = p; (*q != ':') && (*q != '\0'); q++)
+ ;
+ if (q == p) /* empty PATH component => "." */
+ pathv[i] = "./";
+ else {
+ int addSlash = ((*(q - 1)) != '/');
+ pathv[i] = NEW(char, q - p + addSlash + 1);
+ memcpy(pathv[i], p, q - p);
+ if (addSlash)
+ pathv[i][q - p] = '/';
+ pathv[i][q - p + addSlash] = '\0';
+ }
+ }
+ return (const char * const *) pathv;
+}
+
+/**
+ * Cached value of JVM's effective PATH.
+ * (We don't support putenv("PATH=...") in native code)
+ */
+static const char *parentPath;
+
+/**
+ * Split, canonicalized version of parentPath
+ */
+static const char * const *parentPathv;
+
+static jfieldID field_exitcode;
+
+JNIEXPORT void JNICALL
+Java_java_lang_UNIXProcess_initIDs(JNIEnv *env, jclass clazz)
+{
+ field_exitcode = (*env)->GetFieldID(env, clazz, "exitcode", "I");
+
+ parentPath = effectivePath();
+ parentPathv = splitPath(env, parentPath);
+
+ setSIGCHLDHandler(env);
+}
+
+
+#ifndef WIFEXITED
+#define WIFEXITED(status) (((status)&0xFF) == 0)
+#endif
+
+#ifndef WEXITSTATUS
+#define WEXITSTATUS(status) (((status)>>8)&0xFF)
+#endif
+
+#ifndef WIFSIGNALED
+#define WIFSIGNALED(status) (((status)&0xFF) > 0 && ((status)&0xFF00) == 0)
+#endif
+
+#ifndef WTERMSIG
+#define WTERMSIG(status) ((status)&0x7F)
+#endif
+
+/* Block until a child process exits and return its exit code.
+ Note, can only be called once for any given pid. */
+JNIEXPORT jint JNICALL
+Java_java_lang_UNIXProcess_waitForProcessExit(JNIEnv* env,
+ jobject junk,
+ jint pid)
+{
+ /* We used to use waitid() on Solaris, waitpid() on Linux, but
+ * waitpid() is more standard, so use it on all POSIX platforms. */
+ int status;
+ /* Wait for the child process to exit. This returns immediately if
+ the child has already exited. */
+ while (waitpid(pid, &status, 0) < 0) {
+ switch (errno) {
+ case ECHILD: return 0;
+ case EINTR: break;
+ default: return -1;
+ }
+ }
+
+ if (WIFEXITED(status)) {
+ /*
+ * The child exited normally; get its exit code.
+ */
+ return WEXITSTATUS(status);
+ } else if (WIFSIGNALED(status)) {
+ /* The child exited because of a signal.
+ * The best value to return is 0x80 + signal number,
+ * because that is what all Unix shells do, and because
+ * it allows callers to distinguish between process exit and
+ * process death by signal.
+ * Unfortunately, the historical behavior on Solaris is to return
+ * the signal number, and we preserve this for compatibility. */
+#ifdef __solaris__
+ return WTERMSIG(status);
+#else
+ return 0x80 + WTERMSIG(status);
+#endif
+ } else {
+ /*
+ * Unknown exit code; pass it through.
+ */
+ return status;
+ }
+}
+
+static int
+closeDescriptors(void)
+{
+ DIR *dp;
+ struct dirent64 *dirp;
+ int from_fd = FAIL_FILENO + 1;
+
+ /* We're trying to close all file descriptors, but opendir() might
+ * itself be implemented using a file descriptor, and we certainly
+ * don't want to close that while it's in use. We assume that if
+ * opendir() is implemented using a file descriptor, then it uses
+ * the lowest numbered file descriptor, just like open(). So we
+ * close a couple explicitly. */
+
+ close(from_fd); /* for possible use by opendir() */
+ close(from_fd + 1); /* another one for good luck */
+
+ if ((dp = opendir("/proc/self/fd")) == NULL)
+ return 0;
+
+ /* We use readdir64 instead of readdir to work around Solaris bug
+ * 6395699: /proc/self/fd fails to report file descriptors >= 1024 on Solaris 9
+ */
+ while ((dirp = readdir64(dp)) != NULL) {
+ int fd;
+ if (isdigit(dirp->d_name[0]) &&
+ (fd = strtol(dirp->d_name, NULL, 10)) >= from_fd + 2)
+ close(fd);
+ }
+
+ closedir(dp);
+
+ return 1;
+}
+
+static void
+moveDescriptor(int fd_from, int fd_to)
+{
+ if (fd_from != fd_to) {
+ dup2(fd_from, fd_to);
+ close(fd_from);
+ }
+}
+
+static const char *
+getBytes(JNIEnv *env, jbyteArray arr)
+{
+ return arr == NULL ? NULL :
+ (const char*) (*env)->GetByteArrayElements(env, arr, NULL);
+}
+
+static void
+releaseBytes(JNIEnv *env, jbyteArray arr, const char* parr)
+{
+ if (parr != NULL)
+ (*env)->ReleaseByteArrayElements(env, arr, (jbyte*) parr, JNI_ABORT);
+}
+
+static void
+initVectorFromBlock(const char**vector, const char* block, int count)
+{
+ int i;
+ const char *p;
+ for (i = 0, p = block; i < count; i++) {
+ /* Invariant: p always points to the start of a C string. */
+ vector[i] = p;
+ while (*(p++));
+ }
+ vector[count] = NULL;
+}
+
+static void
+throwIOException(JNIEnv *env, int errnum, const char *defaultDetail)
+{
+ static const char * const format = "error=%d, %s";
+ const char *detail = defaultDetail;
+ char *errmsg;
+ jstring s;
+
+ if (errnum != 0) {
+ const char *s = strerror(errnum);
+ if (strcmp(s, "Unknown error") != 0)
+ detail = s;
+ }
+ /* ASCII Decimal representation uses 2.4 times as many bits as binary. */
+ errmsg = NEW(char, strlen(format) + strlen(detail) + 3 * sizeof(errnum));
+ sprintf(errmsg, format, errnum, detail);
+ s = JNU_NewStringPlatform(env, errmsg);
+ if (s != NULL) {
+ jobject x = JNU_NewObjectByName(env, "java/io/IOException",
+ "(Ljava/lang/String;)V", s);
+ if (x != NULL)
+ (*env)->Throw(env, x);
+ }
+ free(errmsg);
+}
+
+#ifdef DEBUG_PROCESS
+/* Debugging process code is difficult; where to write debug output? */
+static void
+debugPrint(char *format, ...)
+{
+ FILE *tty = fopen("/dev/tty", "w");
+ va_list ap;
+ va_start(ap, format);
+ vfprintf(tty, format, ap);
+ va_end(ap);
+ fclose(tty);
+}
+#endif /* DEBUG_PROCESS */
+
+/* Version of execvpe when child's PATH differs from parent's */
+static int
+execvp_usingParentPath(const char *file, const char *const argv[])
+{
+ char expanded_file[PATH_MAX];
+ int filelen = strlen(file);
+ int sticky_errno = 0;
+ const char * const * dirs;
+ /* Search parent's PATH */
+ for (dirs = parentPathv; *dirs; dirs++) {
+ const char * dir = *dirs;
+ int dirlen = strlen(dir);
+ if (filelen + dirlen + 1 >= PATH_MAX) {
+ /* Resist the urge to remove this limit;
+ * calling malloc after fork is unsafe. */
+ errno = ENAMETOOLONG;
+ continue;
+ }
+ strcpy(expanded_file, dir);
+ strcpy(expanded_file + dirlen, file);
+ execvp(expanded_file, (char **) argv);
+ /* There are 3 responses to various classes of errno:
+ * return immediately, continue (especially for ENOENT),
+ * or continue with "sticky" errno.
+ *
+ * From exec(3):
+ *
+ * If permission is denied for a file (the attempted
+ * execve returned EACCES), these functions will continue
+ * searching the rest of the search path. If no other
+ * file is found, however, they will return with the
+ * global variable errno set to EACCES.
+ */
+ switch (errno) {
+ case EACCES:
+ sticky_errno = errno;
+ /* FALLTHRU */
+ case ENOENT:
+ case ENOTDIR:
+#ifdef ELOOP
+ case ELOOP:
+#endif
+#ifdef ESTALE
+ case ESTALE:
+#endif
+#ifdef ENODEV
+ case ENODEV:
+#endif
+#ifdef ETIMEDOUT
+ case ETIMEDOUT:
+#endif
+ break; /* Try other directories in PATH */
+ default:
+ return -1;
+ }
+ }
+ if (sticky_errno != 0)
+ errno = sticky_errno;
+ return -1;
+}
+
+/* execvpe should have been included in the Unix standards. */
+static int
+execvpe(const char *file, const char *const argv[], const char *const envp[])
+{
+ /* This is one of the rare times it's more portable to declare an
+ * external symbol explicitly, rather than via a system header.
+ * The declaration is standardized as part of UNIX98, but there is
+ * no standard (not even de-facto) header file where the
+ * declaration is to be found. See:
+ * http://www.opengroup.org/onlinepubs/009695399/functions/environ.html
+ * http://www.opengroup.org/onlinepubs/009695399/functions/xsh_chap02_02.html
+ *
+ * "All identifiers in this volume of IEEE Std 1003.1-2001, except
+ * environ, are defined in at least one of the headers" (!)
+ */
+ extern char **environ;
+
+ if (envp != NULL)
+ environ = (char **) envp;
+
+ if (/* Parent and child environment the same? Use child PATH. */
+ (envp == NULL)
+
+ /* http://www.opengroup.org/onlinepubs/009695399/functions/exec.html
+ * "If the file argument contains a slash character, it is used as
+ * the pathname for this file. Otherwise, the path prefix for this
+ * file is obtained by a search of the directories passed in the
+ * PATH environment variable" */
+ || (strchr(file, '/') != NULL)
+
+ /* Parent and child PATH the same? Use child PATH. */
+ || (strcmp(parentPath, effectivePath()) == 0)
+
+ /* We want ENOENT, not EACCES, for zero-length program names. */
+ || (*file == '\0'))
+
+ return execvp(file, (char **) argv);
+ else
+ return execvp_usingParentPath(file, argv);
+}
+
+static void
+closeSafely(int fd)
+{
+ if (fd != -1)
+ close(fd);
+}
+
+#ifndef __solaris__
+#undef fork1
+#define fork1() fork()
+#endif
+
+JNIEXPORT jint JNICALL
+Java_java_lang_UNIXProcess_forkAndExec(JNIEnv *env,
+ jobject process,
+ jbyteArray prog,
+ jbyteArray argBlock, jint argc,
+ jbyteArray envBlock, jint envc,
+ jbyteArray dir,
+ jboolean redirectErrorStream,
+ jobject stdin_fd,
+ jobject stdout_fd,
+ jobject stderr_fd)
+{
+ int errnum;
+ int resultPid = -1;
+ int in[2], out[2], err[2], fail[2];
+ const char **argv = NULL;
+ const char **envv = NULL;
+ const char *pprog = getBytes(env, prog);
+ const char *pargBlock = getBytes(env, argBlock);
+ const char *penvBlock = getBytes(env, envBlock);
+ const char *pdir = getBytes(env, dir);
+
+ in[0] = in[1] = out[0] = out[1] = err[0] = err[1] = fail[0] = fail[1] = -1;
+
+ assert(prog != NULL && argBlock != NULL);
+ if (pprog == NULL) goto Catch;
+ if (pargBlock == NULL) goto Catch;
+ if (envBlock != NULL && penvBlock == NULL) goto Catch;
+ if (dir != NULL && pdir == NULL) goto Catch;
+
+ /* Convert pprog + pargBlock into a char ** argv */
+ if ((argv = NEW(const char *, argc + 2)) == NULL)
+ goto Catch;
+ argv[0] = pprog;
+ initVectorFromBlock(argv+1, pargBlock, argc);
+
+ if (envBlock != NULL) {
+ /* Convert penvBlock into a char ** envv */
+ if ((envv = NEW(const char *, envc + 1)) == NULL)
+ goto Catch;
+ initVectorFromBlock(envv, penvBlock, envc);
+ }
+
+ if ((pipe(in) < 0) ||
+ (pipe(out) < 0) ||
+ (pipe(err) < 0) ||
+ (pipe(fail) < 0)) {
+ throwIOException(env, errno, "Bad file descriptor");
+ goto Catch;
+ }
+
+ resultPid = fork1();
+ if (resultPid < 0) {
+ throwIOException(env, errno, "Fork failed");
+ goto Catch;
+ }
+
+ if (resultPid == 0) {
+ /* Child process */
+
+ /* Close the parent sides of the pipe.
+ Give the child sides of the pipes the right fileno's.
+ Closing pipe fds here is redundant, since closeDescriptors()
+ would do it anyways, but a little paranoia is a good thing. */
+ /* Note: it is possible for in[0] == 0 */
+ close(in[1]);
+ moveDescriptor(in[0], STDIN_FILENO);
+ close(out[0]);
+ moveDescriptor(out[1], STDOUT_FILENO);
+ close(err[0]);
+ if (redirectErrorStream) {
+ close(err[1]);
+ dup2(STDOUT_FILENO, STDERR_FILENO);
+ } else {
+ moveDescriptor(err[1], STDERR_FILENO);
+ }
+ close(fail[0]);
+ moveDescriptor(fail[1], FAIL_FILENO);
+
+ /* close everything */
+ if (closeDescriptors() == 0) { /* failed, close the old way */
+ int max_fd = (int)sysconf(_SC_OPEN_MAX);
+ int i;
+ for (i = FAIL_FILENO + 1; i < max_fd; i++)
+ close(i);
+ }
+
+ /* change to the new working directory */
+ if (pdir != NULL && chdir(pdir) < 0)
+ goto WhyCantJohnnyExec;
+
+ if (fcntl(FAIL_FILENO, F_SETFD, FD_CLOEXEC) == -1)
+ goto WhyCantJohnnyExec;
+
+ execvpe(argv[0], argv, envv);
+
+ WhyCantJohnnyExec:
+ /* We used to go to an awful lot of trouble to predict whether the
+ * child would fail, but there is no reliable way to predict the
+ * success of an operation without *trying* it, and there's no way
+ * to try a chdir or exec in the parent. Instead, all we need is a
+ * way to communicate any failure back to the parent. Easy; we just
+ * send the errno back to the parent over a pipe in case of failure.
+ * The tricky thing is, how do we communicate the *success* of exec?
+ * We use FD_CLOEXEC together with the fact that a read() on a pipe
+ * yields EOF when the write ends (we have two of them!) are closed.
+ */
+ errnum = errno;
+ write(FAIL_FILENO, &errnum, sizeof(errnum));
+ close(FAIL_FILENO);
+ _exit(-1);
+ }
+
+ /* parent process */
+
+ close(fail[1]); fail[1] = -1; /* See: WhyCantJohnnyExec */
+ if (read(fail[0], &errnum, sizeof(errnum)) != 0) {
+ waitpid(resultPid, NULL, 0);
+ throwIOException(env, errnum, "Exec failed");
+ goto Catch;
+ }
+
+ (*env)->SetIntField(env, stdin_fd, IO_fd_fdID, in [1]);
+ (*env)->SetIntField(env, stdout_fd, IO_fd_fdID, out[0]);
+ (*env)->SetIntField(env, stderr_fd, IO_fd_fdID, err[0]);
+
+ Finally:
+ /* Always clean up the child's side of the pipes */
+ closeSafely(in [0]);
+ closeSafely(out[1]);
+ closeSafely(err[1]);
+
+ /* Always clean up fail descriptors */
+ closeSafely(fail[0]);
+ closeSafely(fail[1]);
+
+ free(argv);
+ free(envv);
+
+ releaseBytes(env, prog, pprog);
+ releaseBytes(env, argBlock, pargBlock);
+ releaseBytes(env, envBlock, penvBlock);
+ releaseBytes(env, dir, pdir);
+
+ return resultPid;
+
+ Catch:
+ /* Clean up the parent's side of the pipes in case of failure only */
+ closeSafely(in [1]);
+ closeSafely(out[0]);
+ closeSafely(err[0]);
+ goto Finally;
+}
+
+JNIEXPORT void JNICALL
+Java_java_lang_UNIXProcess_destroyProcess(JNIEnv *env, jobject junk, jint pid)
+{
+ kill(pid, SIGTERM);
+}