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/* Determine the Java version supported by javaexec.
Copyright (C) 2006-2021 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2006.
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 <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "javaversion.h"
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#if ENABLE_RELOCATABLE
# include "relocatable.h"
#else
# define relocate(pathname) (pathname)
# define relocate2(pathname,allocatedp) (*(allocatedp) = NULL, (pathname))
#endif
#include "javaexec.h"
#include "spawn-pipe.h"
#include "wait-process.h"
#include "error.h"
#include "gettext.h"
#define _(str) gettext (str)
/* Get PKGDATADIR. */
#include "configmake.h"
struct locals
{
/* OUT */
char *line;
};
static bool
execute_and_read_line (const char *progname,
const char *prog_path, const char * const *prog_argv,
void *private_data)
{
struct locals *l = (struct locals *) private_data;
pid_t child;
int fd[1];
FILE *fp;
char *line;
size_t linesize;
size_t linelen;
int exitstatus;
/* Open a pipe to the JVM. */
child = create_pipe_in (progname, prog_path, prog_argv, NULL,
DEV_NULL, false, true, false, fd);
if (child == -1)
return false;
/* Retrieve its result. */
fp = fdopen (fd[0], "r");
if (fp == NULL)
{
error (0, errno, _("fdopen() failed"));
return false;
}
line = NULL; linesize = 0;
linelen = getline (&line, &linesize, fp);
if (linelen == (size_t)(-1))
{
error (0, 0, _("%s subprocess I/O error"), progname);
return false;
}
if (linelen > 0 && line[linelen - 1] == '\n')
line[linelen - 1] = '\0';
fclose (fp);
/* Remove zombie process from process list, and retrieve exit status. */
exitstatus =
wait_subprocess (child, progname, true, false, true, false, NULL);
if (exitstatus != 0)
{
free (line);
return false;
}
l->line = line;
return false;
}
char *
javaexec_version (void)
{
const char *class_name = "javaversion";
char *malloc_pkgdatadir;
const char *pkgdatadir = relocate2 (PKGDATADIR, &malloc_pkgdatadir);
const char *args[1];
struct locals locals;
args[0] = NULL;
locals.line = NULL;
execute_java_class (class_name, &pkgdatadir, 1, true, NULL, args,
false, false, execute_and_read_line, &locals);
free (malloc_pkgdatadir);
return locals.line;
}
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