-#serial 4
-# Check whether getcwd has the bug that it succeeds for a working directory
-# longer than PATH_MAX, yet returns a truncated directory name.
+#serial 11
+# Check for several getcwd bugs with long file names.
# If so, arrange to compile the wrapper function.
# This is necessary for at least GNU libc on linux-2.4.19 and 2.4.20.
# I've heard that this is due to a Linux kernel bug, and that it has
# been fixed between 2.4.21-pre3 and 2.4.21-pre4. */
-# Copyright (C) 2003, 2004 Free Software Foundation, Inc.
-
-# 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 2, 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, write to the Free Software Foundation,
-# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+# Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
# From Jim Meyering
-AC_DEFUN([GL_FUNC_GETCWD_PATH_MAX],
+AC_DEFUN([gl_FUNC_GETCWD_PATH_MAX],
[
- AC_CHECK_DECLS([getcwd])
- AC_CACHE_CHECK([whether getcwd properly handles paths longer than PATH_MAX],
- gl_cv_func_getcwd_vs_path_max,
- [
- # Arrange for deletion of the temporary directory this test creates.
- ac_clean_files="$ac_clean_files confdir3"
- AC_RUN_IFELSE([AC_LANG_SOURCE([[
+ AC_CHECK_DECLS_ONCE(getcwd)
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+ AC_CACHE_CHECK([whether getcwd handles long file names properly],
+ gl_cv_func_getcwd_path_max,
+ [# Arrange for deletion of the temporary directory this test creates.
+ ac_clean_files="$ac_clean_files confdir3"
+ AC_RUN_IFELSE(
+ [AC_LANG_SOURCE(
+ [[
+#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <limits.h>
#include <sys/stat.h>
#include <sys/types.h>
+#include <fcntl.h>
-/* Don't get link errors because mkdir is redefined to rpl_mkdir. */
-#undef mkdir
-
-#ifndef CHAR_BIT
-# define CHAR_BIT 8
+#ifndef AT_FDCWD
+# define AT_FDCWD 0
+#endif
+#ifdef ENAMETOOLONG
+# define is_ENAMETOOLONG(x) ((x) == ENAMETOOLONG)
+#else
+# define is_ENAMETOOLONG(x) 0
#endif
-/* The extra casts work around common compiler bugs. */
-#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
-/* The outer cast is needed to work around a bug in Cray C 5.0.3.0.
- It is necessary at least when t == time_t. */
-#define TYPE_MINIMUM(t) ((t) (TYPE_SIGNED (t) \
- ? ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1) : (t) 0))
-#define TYPE_MAXIMUM(t) ((t) (~ (t) 0 - TYPE_MINIMUM (t)))
+/* Don't get link errors because mkdir is redefined to rpl_mkdir. */
+#undef mkdir
-#ifndef INT_MAX
-# define INT_MAX TYPE_MAXIMUM (int)
+#ifndef S_IRWXU
+# define S_IRWXU 0700
#endif
/* The length of this name must be 8. */
#define DIR_NAME "confdir3"
+#define DIR_NAME_LEN 8
+#define DIR_NAME_SIZE (DIR_NAME_LEN + 1)
+
+/* The length of "../". */
+#define DOTDOTSLASH_LEN 3
+
+/* Leftover bytes in the buffer, to work around library or OS bugs. */
+#define BUF_SLOP 20
int
main ()
about remote file systems, we'd have to enable the wrapper function
all of the time, just to be safe. That's not worth the cost. */
exit (0);
-#elif INT_MAX - 9 <= PATH_MAX
- /* The '9', above, comes from strlen (DIR_NAME) + 1. */
+#elif ((INT_MAX / (DIR_NAME_SIZE / DOTDOTSLASH_LEN + 1) \
+ - DIR_NAME_SIZE - BUF_SLOP) \
+ <= PATH_MAX)
/* FIXME: Assuming there's a system for which this is true,
this should be done in a compile test. */
exit (0);
#else
- char buf[PATH_MAX + 20];
+ char buf[PATH_MAX * (DIR_NAME_SIZE / DOTDOTSLASH_LEN + 1)
+ + DIR_NAME_SIZE + BUF_SLOP];
char *cwd = getcwd (buf, PATH_MAX);
+ size_t initial_cwd_len;
size_t cwd_len;
int fail = 0;
size_t n_chdirs = 0;
if (cwd == NULL)
exit (1);
- cwd_len = strlen (cwd);
+ cwd_len = initial_cwd_len = strlen (cwd);
while (1)
{
- char *c;
- size_t len;
-
- cwd_len += 1 + strlen (DIR_NAME);
- /* If mkdir or chdir fails, be pessimistic and consider that
- as a failure, too. */
- if (mkdir (DIR_NAME, 0700) < 0 || chdir (DIR_NAME) < 0)
+ size_t dotdot_max = PATH_MAX * (DIR_NAME_SIZE / DOTDOTSLASH_LEN);
+ char *c = NULL;
+
+ cwd_len += DIR_NAME_SIZE;
+ /* If mkdir or chdir fails, it could be that this system cannot create
+ any file with an absolute name longer than PATH_MAX, such as cygwin.
+ If so, leave fail as 0, because the current working directory can't
+ be too long for getcwd if it can't even be created. For other
+ errors, be pessimistic and consider that as a failure, too. */
+ if (mkdir (DIR_NAME, S_IRWXU) < 0 || chdir (DIR_NAME) < 0)
{
- fail = 1;
+ if (! (errno == ERANGE || is_ENAMETOOLONG (errno)))
+ fail = 2;
break;
}
- if ((c = getcwd (buf, PATH_MAX)) == NULL)
- {
- /* This allows any failure to indicate there is no bug.
- FIXME: check errno? */
- break;
+
+ if (PATH_MAX <= cwd_len && cwd_len < PATH_MAX + DIR_NAME_SIZE)
+ {
+ c = getcwd (buf, PATH_MAX);
+ if (!c && errno == ENOENT)
+ {
+ fail = 1;
+ break;
+ }
+ if (c || ! (errno == ERANGE || is_ENAMETOOLONG (errno)))
+ {
+ fail = 2;
+ break;
+ }
}
- if ((len = strlen (c)) != cwd_len)
+
+ if (dotdot_max <= cwd_len - initial_cwd_len)
+ {
+ if (dotdot_max + DIR_NAME_SIZE < cwd_len - initial_cwd_len)
+ break;
+ c = getcwd (buf, cwd_len + 1);
+ if (!c)
+ {
+ if (! (errno == ERANGE || errno == ENOENT
+ || is_ENAMETOOLONG (errno)))
+ {
+ fail = 2;
+ break;
+ }
+ if (AT_FDCWD || errno == ERANGE || errno == ENOENT)
+ {
+ fail = 1;
+ break;
+ }
+ }
+ }
+
+ if (c && strlen (c) != cwd_len)
{
- fail = 1;
+ fail = 2;
break;
}
++n_chdirs;
- if (PATH_MAX < len)
- break;
}
/* Leaving behind such a deep directory is not polite.
exit (fail);
#endif
}
- ]])],
- [gl_cv_func_getcwd_vs_path_max=yes],
- [gl_cv_func_getcwd_vs_path_max=no],
- [gl_cv_func_getcwd_vs_path_max=no])])
-
- if test $gl_cv_func_getcwd_vs_path_max = no; then
- AC_LIBOBJ(getcwd)
- AC_DEFINE(getcwd, rpl_getcwd,
- [Define to rpl_getcwd if the wrapper function should be used.])
- fi
+ ]])],
+ [gl_cv_func_getcwd_path_max=yes],
+ [case $? in
+ 1) gl_cv_func_getcwd_path_max='no, but it is partly working';;
+ *) gl_cv_func_getcwd_path_max=no;;
+ esac],
+ [gl_cv_func_getcwd_path_max=no])
+ ])
+ case $gl_cv_func_getcwd_path_max in
+ no,*)
+ AC_DEFINE([HAVE_PARTLY_WORKING_GETCWD], 1,
+ [Define to 1 if getcwd works, except it sometimes fails when it shouldn't,
+ setting errno to ERANGE, ENAMETOOLONG, or ENOENT. If __GETCWD_PREFIX
+ is not defined, it doesn't matter whether HAVE_PARTLY_WORKING_GETCWD
+ is defined.]);;
+ esac
])
projects / gnulib.git / blobdiff