1dnl Copyright 2011 The Kyua Authors. 2dnl All rights reserved. 3dnl 4dnl Redistribution and use in source and binary forms, with or without 5dnl modification, are permitted provided that the following conditions are 6dnl met: 7dnl 8dnl * Redistributions of source code must retain the above copyright 9dnl notice, this list of conditions and the following disclaimer. 10dnl * Redistributions in binary form must reproduce the above copyright 11dnl notice, this list of conditions and the following disclaimer in the 12dnl documentation and/or other materials provided with the distribution. 13dnl * Neither the name of Google Inc. nor the names of its contributors 14dnl may be used to endorse or promote products derived from this software 15dnl without specific prior written permission. 16dnl 17dnl THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18dnl "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19dnl LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20dnl A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21dnl OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22dnl SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23dnl LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24dnl DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25dnl THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26dnl (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27dnl OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 29dnl \file m4/fs.m4 30dnl File system related checks. 31dnl 32dnl The macros in this file check for features required in the utils/fs 33dnl module. The global KYUA_FS_MODULE macro will call all checks required 34dnl for the library. 35 36 37dnl KYUA_FS_GETCWD_DYN 38dnl 39dnl Checks whether getcwd(NULL, 0) works; i.e. if getcwd(3) can dynamically 40dnl allocate the output buffer to fit the whole current path. 41AC_DEFUN([KYUA_FS_GETCWD_DYN], [ 42 AC_CACHE_CHECK( 43 [whether getcwd(NULL, 0) works], 44 [kyua_cv_getcwd_dyn], [ 45 AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <stdlib.h> 46#include <unistd.h> 47], [ 48 char *cwd = getcwd(NULL, 0); 49 return (cwd != NULL) ? EXIT_SUCCESS : EXIT_FAILURE; 50])], 51 [kyua_cv_getcwd_dyn=yes], 52 [kyua_cv_getcwd_dyn=no]) 53 ]) 54 if test "${kyua_cv_getcwd_dyn}" = yes; then 55 AC_DEFINE_UNQUOTED([HAVE_GETCWD_DYN], [1], 56 [Define to 1 if getcwd(NULL, 0) works]) 57 fi 58]) 59 60 61dnl KYUA_FS_LCHMOD 62dnl 63dnl Checks whether lchmod(3) exists and if it works. Some systems, such as 64dnl Ubuntu 10.04.1 LTS, provide a lchmod(3) stub that is not implemented yet 65dnl allows programs to compile cleanly (albeit for a warning). It would be 66dnl nice to detect if lchmod(3) works at run time to prevent side-effects of 67dnl this test but doing so means we will keep receiving a noisy compiler 68dnl warning. 69AC_DEFUN([KYUA_FS_LCHMOD], [ 70 AC_CACHE_CHECK( 71 [for a working lchmod], 72 [kyua_cv_lchmod_works], [ 73 AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <sys/stat.h> 74#include <fcntl.h> 75#include <stdio.h> 76#include <stdlib.h> 77#include <unistd.h> 78], [ 79 int fd = open("conftest.txt", O_WRONLY | O_CREAT | O_TRUNC, 0644); 80 if (fd == -1) { 81 perror("creation of conftest.txt failed"); 82 return EXIT_FAILURE; 83 } 84 85 return lchmod("conftest.txt", 0640) != -1 ? EXIT_SUCCESS : EXIT_FAILURE; 86])], 87 [kyua_cv_lchmod_works=yes], 88 [kyua_cv_lchmod_works=no]) 89 ]) 90 rm -f conftest.txt 91 if test "${kyua_cv_lchmod_works}" = yes; then 92 AC_DEFINE_UNQUOTED([HAVE_WORKING_LCHMOD], [1], 93 [Define to 1 if your lchmod works]) 94 fi 95]) 96 97 98dnl KYUA_FS_UNMOUNT 99dnl 100dnl Detect the correct method to unmount a file system. 101AC_DEFUN([KYUA_FS_UNMOUNT], [ 102 AC_CHECK_FUNCS([unmount], [have_unmount2=yes], [have_unmount2=no]) 103 if test "${have_unmount2}" = no; then 104 have_umount8=yes 105 AC_PATH_PROG([UMOUNT], [umount], [have_umount8=no]) 106 if test "${have_umount8}" = yes; then 107 AC_DEFINE_UNQUOTED([UMOUNT], ["${UMOUNT}"], 108 [Set to the path of umount(8)]) 109 else 110 AC_MSG_ERROR([Don't know how to unmount a file system]) 111 fi 112 fi 113]) 114 115 116dnl KYUA_FS_MODULE 117dnl 118dnl Performs all checks needed by the utils/fs library. 119AC_DEFUN([KYUA_FS_MODULE], [ 120 AC_CHECK_HEADERS([sys/mount.h sys/statvfs.h sys/vfs.h]) 121 AC_CHECK_FUNCS([statfs statvfs]) 122 KYUA_FS_GETCWD_DYN 123 KYUA_FS_LCHMOD 124 KYUA_FS_UNMOUNT 125]) 126