342 lines
8.0 KiB
C++
342 lines
8.0 KiB
C++
// natPosixProcess.cc - Native side of POSIX process code.
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/* Copyright (C) 1998, 1999, 2000, 2002, 2003, 2004 Free Software Foundation
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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#include <config.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <gcj/cni.h>
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#include <jvm.h>
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#include <java/lang/ConcreteProcess.h>
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#include <java/lang/IllegalThreadStateException.h>
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#include <java/lang/InterruptedException.h>
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#include <java/lang/NullPointerException.h>
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#include <java/lang/Thread.h>
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#include <java/io/File.h>
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#include <java/io/FileDescriptor.h>
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#include <gnu/java/nio/channels/FileChannelImpl.h>
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#include <java/io/FileInputStream.h>
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#include <java/io/FileOutputStream.h>
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#include <java/io/IOException.h>
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#include <java/lang/OutOfMemoryError.h>
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using gnu::java::nio::channels::FileChannelImpl;
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extern char **environ;
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void
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java::lang::ConcreteProcess::destroy (void)
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{
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if (! hasExited)
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{
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// Really kill it.
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kill ((pid_t) pid, SIGKILL);
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}
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}
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jint
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java::lang::ConcreteProcess::waitFor (void)
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{
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if (! hasExited)
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{
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int wstat;
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int r = waitpid ((pid_t) pid, &wstat, 0);
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if (r == -1)
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{
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if (java::lang::Thread::interrupted())
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throw new InterruptedException (JvNewStringLatin1 (strerror
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(errno)));
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}
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else
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{
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hasExited = true;
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if (WIFEXITED (wstat))
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status = WEXITSTATUS (wstat);
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else
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status = -1;
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}
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}
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return status;
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}
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static char *
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new_string (jstring string)
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{
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jsize s = _Jv_GetStringUTFLength (string);
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char *buf = (char *) _Jv_Malloc (s + 1);
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_Jv_GetStringUTFRegion (string, 0, string->length(), buf);
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buf[s] = '\0';
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return buf;
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}
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static void
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cleanup (char **args, char **env, char *path)
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{
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if (args != NULL)
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{
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for (int i = 0; args[i] != NULL; ++i)
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_Jv_Free (args[i]);
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_Jv_Free (args);
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}
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if (env != NULL)
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{
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for (int i = 0; env[i] != NULL; ++i)
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_Jv_Free (env[i]);
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_Jv_Free (env);
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}
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if (path != NULL)
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_Jv_Free (path);
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}
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// This makes our error handling a bit simpler and it lets us avoid
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// thread bugs where we close a possibly-reopened file descriptor for
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// a second time.
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static void
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myclose (int &fd)
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{
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if (fd != -1)
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close (fd);
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fd = -1;
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}
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void
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java::lang::ConcreteProcess::startProcess (jstringArray progarray,
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jstringArray envp,
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java::io::File *dir)
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{
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using namespace java::io;
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hasExited = false;
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// Initialize all locals here to make cleanup simpler.
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char **args = NULL;
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char **env = NULL;
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char *path = NULL;
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int inp[2], outp[2], errp[2], msgp[2];
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inp[0] = -1;
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inp[1] = -1;
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outp[0] = -1;
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outp[1] = -1;
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errp[0] = -1;
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errp[1] = -1;
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msgp[0] = -1;
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msgp[1] = -1;
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java::lang::Throwable *exc = NULL;
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errorStream = NULL;
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inputStream = NULL;
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outputStream = NULL;
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try
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{
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// Transform arrays to native form.
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args = (char **) _Jv_Malloc ((progarray->length + 1)
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* sizeof (char *));
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// Initialize so we can gracefully recover.
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jstring *elts = elements (progarray);
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for (int i = 0; i <= progarray->length; ++i)
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args[i] = NULL;
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for (int i = 0; i < progarray->length; ++i)
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args[i] = new_string (elts[i]);
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args[progarray->length] = NULL;
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if (envp)
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{
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env = (char **) _Jv_Malloc ((envp->length + 1) * sizeof (char *));
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elts = elements (envp);
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// Initialize so we can gracefully recover.
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for (int i = 0; i <= envp->length; ++i)
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env[i] = NULL;
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for (int i = 0; i < envp->length; ++i)
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env[i] = new_string (elts[i]);
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env[envp->length] = NULL;
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}
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// We allocate this here because we can't call malloc() after
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// the fork.
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if (dir != NULL)
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path = new_string (dir->getPath ());
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// Create pipes for I/O. MSGP is for communicating exec()
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// status.
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if (pipe (inp) || pipe (outp) || pipe (errp) || pipe (msgp)
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|| fcntl (msgp[1], F_SETFD, FD_CLOEXEC))
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throw new IOException (JvNewStringLatin1 (strerror (errno)));
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// We create the streams before forking. Otherwise if we had an
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// error while creating the streams we would have run the child
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// with no way to communicate with it.
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errorStream = new FileInputStream (new FileChannelImpl(errp[0], FileChannelImpl::READ));
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inputStream = new FileInputStream (new FileChannelImpl(inp[0], FileChannelImpl::READ));
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outputStream = new FileOutputStream (new FileChannelImpl(outp[1], FileChannelImpl::WRITE));
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// We don't use vfork() because that would cause the local
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// environment to be set by the child.
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if ((pid = (jlong) fork ()) == -1)
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throw new IOException (JvNewStringLatin1 (strerror (errno)));
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if (pid == 0)
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{
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// Child process, so remap descriptors, chdir and exec.
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if (envp)
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{
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// Preserve PATH and LD_LIBRARY_PATH unless specified
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// explicitly.
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char *path_val = getenv ("PATH");
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char *ld_path_val = getenv ("LD_LIBRARY_PATH");
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environ = env;
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if (path_val && getenv ("PATH") == NULL)
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{
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char *path_env = (char *) _Jv_Malloc (strlen (path_val)
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+ 5 + 1);
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strcpy (path_env, "PATH=");
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strcat (path_env, path_val);
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putenv (path_env);
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}
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if (ld_path_val && getenv ("LD_LIBRARY_PATH") == NULL)
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{
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char *ld_path_env
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= (char *) _Jv_Malloc (strlen (ld_path_val) + 16 + 1);
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strcpy (ld_path_env, "LD_LIBRARY_PATH=");
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strcat (ld_path_env, ld_path_val);
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putenv (ld_path_env);
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}
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}
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// We ignore errors from dup2 because they should never occur.
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dup2 (outp[0], 0);
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dup2 (inp[1], 1);
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dup2 (errp[1], 2);
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// Use close and not myclose -- we're in the child, and we
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// aren't worried about the possible race condition.
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close (inp[0]);
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close (inp[1]);
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close (errp[0]);
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close (errp[1]);
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close (outp[0]);
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close (outp[1]);
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close (msgp[0]);
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// Change directory.
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if (path != NULL)
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{
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if (chdir (path) != 0)
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{
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char c = errno;
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write (msgp[1], &c, 1);
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_exit (127);
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}
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}
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execvp (args[0], args);
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// Send the parent notification that the exec failed.
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char c = errno;
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write (msgp[1], &c, 1);
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_exit (127);
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}
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// Parent. Close extra file descriptors and mark ours as
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// close-on-exec.
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myclose (outp[0]);
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myclose (inp[1]);
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myclose (errp[1]);
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myclose (msgp[1]);
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char c;
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int r = read (msgp[0], &c, 1);
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if (r == -1)
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throw new IOException (JvNewStringLatin1 (strerror (errno)));
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else if (r != 0)
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throw new IOException (JvNewStringLatin1 (strerror (c)));
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}
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catch (java::lang::Throwable *thrown)
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{
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// Do some cleanup we only do on failure. If a stream object
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// has been created, we must close the stream itself (to avoid
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// duplicate closes when the stream object is collected).
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// Otherwise we simply close the underlying file descriptor.
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// We ignore errors here as they are uninteresting.
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try
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{
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if (inputStream != NULL)
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inputStream->close ();
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else
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myclose (inp[0]);
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}
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catch (java::lang::Throwable *ignore)
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{
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}
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try
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{
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if (outputStream != NULL)
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outputStream->close ();
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else
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myclose (outp[1]);
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}
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catch (java::lang::Throwable *ignore)
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{
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}
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try
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{
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if (errorStream != NULL)
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errorStream->close ();
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else
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myclose (errp[0]);
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}
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catch (java::lang::Throwable *ignore)
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{
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}
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// These are potentially duplicate, but it doesn't matter due to
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// the use of myclose.
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myclose (outp[0]);
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myclose (inp[1]);
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myclose (errp[1]);
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myclose (msgp[1]);
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exc = thrown;
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}
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myclose (msgp[0]);
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cleanup (args, env, path);
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if (exc != NULL)
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throw exc;
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else
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{
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fcntl (outp[1], F_SETFD, FD_CLOEXEC);
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fcntl (inp[0], F_SETFD, FD_CLOEXEC);
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fcntl (errp[0], F_SETFD, FD_CLOEXEC);
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}
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}
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