/* Execute a Java program.
Copyright (C) 2001-2003, 2006-2015 Free Software Foundation, Inc.
Written by Bruno Haible <haible@clisp.cons.org>, 2001.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <alloca.h>
/* Specification. */
#include "javaexec.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "execute.h"
#include "classpath.h"
#include "xsetenv.h"
#include "sh-quote.h"
#include "concat-filename.h"
#include "xalloc.h"
#include "xmalloca.h"
#include "error.h"
#include "gettext.h"
#define _(str) gettext (str)
/* Survey of Java virtual machines.
A = does it work without CLASSPATH being set
B = does it work with CLASSPATH being set to empty
C = option to set CLASSPATH, other than setting it in the environment
T = test for presence
Program from A B C T
$JAVA unknown N Y n/a true
gij GCC 3.0 Y Y n/a gij --version >/dev/null
java JDK 1.1.8 Y Y -classpath P java -version 2>/dev/null
jre JDK 1.1.8 N Y -classpath P jre 2>/dev/null; test $? = 1
java JDK 1.3.0 Y Y -classpath P java -version 2>/dev/null
jview MS IE Y Y -cp P jview -? >nul; %errorlevel% = 1
The CLASSPATH is a colon separated list of pathnames. (On Windows: a
semicolon separated list of pathnames.)
We try the Java virtual machines in the following order:
1. getenv ("JAVA"), because the user must be able to override our
preferences,
2. "gij", because it is a completely free JVM,
3. "java", because it is a standard JVM,
4. "jre", comes last because it requires a CLASSPATH environment variable,
5. "jview", on Windows only, because it is frequently installed.
We unset the JAVA_HOME environment variable, because a wrong setting of
this variable can confuse the JDK's javac.
*/
bool
execute_java_class (const char *class_name,
const char * const *classpaths,
unsigned int classpaths_count,
bool use_minimal_classpath,
const char *exe_dir,
const char * const *args,
bool verbose, bool quiet,
execute_fn *executer, void *private_data)
{
bool err = false;
unsigned int nargs;
char *old_JAVA_HOME;
/* Count args. */
{
const char * const *arg;
for (nargs = 0, arg = args; *arg != NULL; nargs++, arg++)
;
}
/* First, try a class compiled to a native code executable. */
if (exe_dir != NULL)
{
char *exe_pathname = xconcatenated_filename (exe_dir, class_name, EXEEXT);
char *old_classpath;
char **argv = (char **) xmalloca ((1 + nargs + 1) * sizeof (char *));
unsigned int i;
/* Set CLASSPATH. */
old_classpath =
set_classpath (classpaths, classpaths_count, use_minimal_classpath,
verbose);
argv[0] = exe_pathname;
for (i = 0; i <= nargs; i++)
argv[1 + i] = (char *) args[i];
if (verbose)
{
char *command = shell_quote_argv (argv);
printf ("%s\n", command);
free (command);
}
err = executer (class_name, exe_pathname, argv, private_data);
/* Reset CLASSPATH. */
reset_classpath (old_classpath);
freea (argv);
goto done1;
}
{
const char *java = getenv ("JAVA");
if (java != NULL && java[0] != '\0')
{
/* Because $JAVA may consist of a command and options, we use the
shell. Because $JAVA has been set by the user, we leave all
all environment variables in place, including JAVA_HOME, and
we don't erase the user's CLASSPATH. */
char *old_classpath;
unsigned int command_length;
char *command;
char *argv[4];
const char * const *arg;
char *p;
/* Set CLASSPATH. */
old_classpath =
set_classpath (classpaths, classpaths_count, false,
verbose);
command_length = strlen (java);
command_length += 1 + shell_quote_length (class_name);
for (arg = args; *arg != NULL; arg++)
command_length += 1 + shell_quote_length (*arg);
command_length += 1;
command = (char *) xmalloca (command_length);
p = command;
/* Don't shell_quote $JAVA, because it may consist of a command
and options. */
memcpy (p, java, strlen (java));
p += strlen (java);
*p++ = ' ';
p = shell_quote_copy (p, class_name);
for (arg = args; *arg != NULL; arg++)
{
*p++ = ' ';
p = shell_quote_copy (p, *arg);
}
*p++ = '\0';
/* Ensure command_length was correctly calculated. */
if (p - command > command_length)
abort ();
if (verbose)
printf ("%s\n", command);
argv[0] = "/bin/sh";
argv[1] = "-c";
argv[2] = command;
argv[3] = NULL;
err = executer (java, "/bin/sh", argv, private_data);
freea (command);
/* Reset CLASSPATH. */
reset_classpath (old_classpath);
goto done1;
}
}
/* Unset the JAVA_HOME environment variable. */
old_JAVA_HOME = getenv ("JAVA_HOME");
if (old_JAVA_HOME != NULL)
{
old_JAVA_HOME = xstrdup (old_JAVA_HOME);
unsetenv ("JAVA_HOME");
}
{
static bool gij_tested;
static bool gij_present;
if (!gij_tested)
{
/* Test for presence of gij: "gij --version > /dev/null" */
char *argv[3];
int exitstatus;
argv[0] = "gij";
argv[1] = "--version";
argv[2] = NULL;
exitstatus = execute ("gij", "gij", argv, false, false, true, true,
true, false, NULL);
gij_present = (exitstatus == 0);
gij_tested = true;
}
if (gij_present)
{
char *old_classpath;
char **argv = (char **) xmalloca ((2 + nargs + 1) * sizeof (char *));
unsigned int i;
/* Set CLASSPATH. */
old_classpath =
set_classpath (classpaths, classpaths_count, use_minimal_classpath,
verbose);
argv[0] = "gij";
argv[1] = (char *) class_name;
for (i = 0; i <= nargs; i++)
argv[2 + i] = (char *) args[i];
if (verbose)
{
char *command = shell_quote_argv (argv);
printf ("%s\n", command);
free (command);
}
err = executer ("gij", "gij", argv, private_data);
/* Reset CLASSPATH. */
reset_classpath (old_classpath);
freea (argv);
goto done2;
}
}
{
static bool java_tested;
static bool java_present;
if (!java_tested)
{
/* Test for presence of java: "java -version 2> /dev/null" */
char *argv[3];
int exitstatus;
argv[0] = "java";
argv[1] = "-version";
argv[2] = NULL;
exitstatus = execute ("java", "java", argv, false, false, true, true,
true, false, NULL);
java_present = (exitstatus == 0);
java_tested = true;
}
if (java_present)
{
char *old_classpath;
char **argv = (char **) xmalloca ((2 + nargs + 1) * sizeof (char *));
unsigned int i;
/* Set CLASSPATH. We don't use the "-classpath ..." option because
in JDK 1.1.x its argument should also contain the JDK's classes.zip,
but we don't know its location. (In JDK 1.3.0 it would work.) */
old_classpath =
set_classpath (classpaths, classpaths_count, use_minimal_classpath,
verbose);
argv[0] = "java";
argv[1] = (char *) class_name;
for (i = 0; i <= nargs; i++)
argv[2 + i] = (char *) args[i];
if (verbose)
{
char *command = shell_quote_argv (argv);
printf ("%s\n", command);
free (command);
}
err = executer ("java", "java", argv, private_data);
/* Reset CLASSPATH. */
reset_classpath (old_classpath);
freea (argv);
goto done2;
}
}
{
static bool jre_tested;
static bool jre_present;
if (!jre_tested)
{
/* Test for presence of jre: "jre 2> /dev/null ; test $? = 1" */
char *argv[2];
int exitstatus;
argv[0] = "jre";
argv[1] = NULL;
exitstatus = execute ("jre", "jre", argv, false, false, true, true,
true, false, NULL);
jre_present = (exitstatus == 0 || exitstatus == 1);
jre_tested = true;
}
if (jre_present)
{
char *old_classpath;
char **argv = (char **) xmalloca ((2 + nargs + 1) * sizeof (char *));
unsigned int i;
/* Set CLASSPATH. We don't use the "-classpath ..." option because
in JDK 1.1.x its argument should also contain the JDK's classes.zip,
but we don't know its location. */
old_classpath =
set_classpath (classpaths, classpaths_count, use_minimal_classpath,
verbose);
argv[0] = "jre";
argv[1] = (char *) class_name;
for (i = 0; i <= nargs; i++)
argv[2 + i] = (char *) args[i];
if (verbose)
{
char *command = shell_quote_argv (argv);
printf ("%s\n", command);
free (command);
}
err = executer ("jre", "jre", argv, private_data);
/* Reset CLASSPATH. */
reset_classpath (old_classpath);
freea (argv);
goto done2;
}
}
#if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__
/* Native Windows, Cygwin */
{
static bool jview_tested;
static bool jview_present;
if (!jview_tested)
{
/* Test for presence of jview: "jview -? >nul ; test $? = 1" */
char *argv[3];
int exitstatus;
argv[0] = "jview";
argv[1] = "-?";
argv[2] = NULL;
exitstatus = execute ("jview", "jview", argv, false, false, true, true,
true, false, NULL);
jview_present = (exitstatus == 0 || exitstatus == 1);
jview_tested = true;
}
if (jview_present)
{
char *old_classpath;
char **argv = (char **) xmalloca ((2 + nargs + 1) * sizeof (char *));
unsigned int i;
/* Set CLASSPATH. */
old_classpath =
set_classpath (classpaths, classpaths_count, use_minimal_classpath,
verbose);
argv[0] = "jview";
argv[1] = (char *) class_name;
for (i = 0; i <= nargs; i++)
argv[2 + i] = (char *) args[i];
if (verbose)
{
char *command = shell_quote_argv (argv);
printf ("%s\n", command);
free (command);
}
err = executer ("jview", "jview", argv, private_data);
/* Reset CLASSPATH. */
reset_classpath (old_classpath);
freea (argv);
goto done2;
}
}
#endif
if (!quiet)
error (0, 0, _("Java virtual machine not found, try installing gij or set $JAVA"));
err = true;
done2:
if (old_JAVA_HOME != NULL)
{
xsetenv ("JAVA_HOME", old_JAVA_HOME, 1);
free (old_JAVA_HOME);
}
done1:
return err;
}