1/* Determine the Java version supported by javaexec. 2 Copyright (C) 2006, 2007 Free Software Foundation, Inc. 3 Written by Bruno Haible <bruno@clisp.org>, 2006. 4 5 This program is free software: you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 17 18#include <config.h> 19 20/* Specification. */ 21#include "javaversion.h" 22 23#include <errno.h> 24#include <stdbool.h> 25#include <stdio.h> 26 27#if ENABLE_RELOCATABLE 28# include "relocatable.h" 29#else 30# define relocate(pathname) (pathname) 31#endif 32 33/* Get PKGDATADIR. */ 34#include "configmake.h" 35 36#include "javaexec.h" 37#include "pipe.h" 38#include "wait-process.h" 39#include "error.h" 40#include "gettext.h" 41 42#define _(str) gettext (str) 43 44 45struct locals 46{ 47 /* OUT */ 48 char *line; 49}; 50 51static bool 52execute_and_read_line (const char *progname, 53 const char *prog_path, char **prog_argv, 54 void *private_data) 55{ 56 struct locals *l = (struct locals *) private_data; 57 pid_t child; 58 int fd[1]; 59 FILE *fp; 60 char *line; 61 size_t linesize; 62 size_t linelen; 63 int exitstatus; 64 65 /* Open a pipe to the JVM. */ 66 child = create_pipe_in (progname, prog_path, prog_argv, DEV_NULL, false, 67 true, false, fd); 68 69 if (child == -1) 70 return false; 71 72 /* Retrieve its result. */ 73 fp = fdopen (fd[0], "r"); 74 if (fp == NULL) 75 { 76 error (0, errno, _("fdopen() failed")); 77 return false; 78 } 79 80 line = NULL; linesize = 0; 81 linelen = getline (&line, &linesize, fp); 82 if (linelen == (size_t)(-1)) 83 { 84 error (0, 0, _("%s subprocess I/O error"), progname); 85 return false; 86 } 87 if (linelen > 0 && line[linelen - 1] == '\n') 88 line[linelen - 1] = '\0'; 89 90 fclose (fp); 91 92 /* Remove zombie process from process list, and retrieve exit status. */ 93 exitstatus = wait_subprocess (child, progname, true, false, true, false); 94 if (exitstatus != 0) 95 { 96 free (line); 97 return false; 98 } 99 100 l->line = line; 101 return false; 102} 103 104char * 105javaexec_version (void) 106{ 107 const char *class_name = "javaversion"; 108 const char *pkgdatadir = relocate (PKGDATADIR); 109 const char *args[1]; 110 struct locals locals; 111 112 args[0] = NULL; 113 locals.line = NULL; 114 execute_java_class (class_name, &pkgdatadir, 1, true, NULL, args, 115 false, false, execute_and_read_line, &locals); 116 117 return locals.line; 118} 119