kc3-lang/gnulib/lib/javaversion.c

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• Hash : 57fdfd3f
  Author :
  Date : 2007-10-07T19:14:58
  

  Change copyright notice from GPLv2+ to GPLv3+.
  

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• lib/javaversion.c

• /* Determine the Java version supported by javaexec.
     Copyright (C) 2006, 2007 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 <http://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include "javaversion.h"
  
  #include <errno.h>
  #include <stdbool.h>
  #include <stdio.h>
  
  #if ENABLE_RELOCATABLE
  # include "relocatable.h"
  #else
  # define relocate(pathname) (pathname)
  #endif
  
  /* Get PKGDATADIR.  */
  #include "configmake.h"
  
  #include "javaexec.h"
  #include "pipe.h"
  #include "wait-process.h"
  #include "error.h"
  #include "gettext.h"
  
  #define _(str) gettext (str)
  
  
  struct locals
  {
    /* OUT */
    char *line;
  };
  
  static bool
  execute_and_read_line (const char *progname,
  		       const char *prog_path, char **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, 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);
    if (exitstatus != 0)
      {
        free (line);
        return false;
      }
  
    l->line = line;
    return false;
  }
  
  char *
  javaexec_version (void)
  {
    const char *class_name = "javaversion";
    const char *pkgdatadir = relocate (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);
  
    return locals.line;
  }
  

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