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# serial 4
# Determine whether getcwd aborts when the length of the working directory
# name is unusually large. Any length between 4k and 16k trigger the bug
# when using glibc-2.4.90-9 or older.
# Copyright (C) 2006, 2009-2011 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
# gl_FUNC_GETCWD_ABORT_BUG([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
AC_DEFUN([gl_FUNC_GETCWD_ABORT_BUG],
[
AC_CHECK_DECLS_ONCE([getcwd])
AC_CHECK_FUNCS([getpagesize])
AC_CACHE_CHECK([whether getcwd aborts when 4k < cwd_length < 16k],
gl_cv_func_getcwd_abort_bug,
[# Remove any remnants of a previous test.
rm -rf confdir-14B---
# Arrange for deletion of the temporary directory this test creates.
ac_clean_files="$ac_clean_files confdir-14B---"
dnl Please keep this in sync with tests/test-getcwd.c.
AC_RUN_IFELSE(
[AC_LANG_SOURCE(
[[
#include <stdlib.h>
#include <unistd.h>
#include <limits.h>
#include <string.h>
#include <sys/stat.h>
/* Don't get link errors because mkdir is redefined to rpl_mkdir. */
#undef mkdir
#ifndef S_IRWXU
# define S_IRWXU 0700
#endif
/* FIXME: skip the run-test altogether on systems without getpagesize. */
#if ! HAVE_GETPAGESIZE
# define getpagesize() 0
#endif
/* This size is chosen to be larger than PATH_MAX (4k), yet smaller than
the 16kB pagesize on ia64 linux. Those conditions make the code below
trigger a bug in glibc's getcwd implementation before 2.4.90-10. */
#define TARGET_LEN (5 * 1024)
int
main ()
{
char const *dir_name = "confdir-14B---";
char *cwd;
size_t initial_cwd_len;
int fail = 0;
size_t desired_depth;
size_t d;
/* The bug is triggered when PATH_MAX < getpagesize (), so skip
this relatively expensive and invasive test if that's not true. */
if (getpagesize () <= PATH_MAX)
return 0;
cwd = getcwd (NULL, 0);
if (cwd == NULL)
return 2;
initial_cwd_len = strlen (cwd);
free (cwd);
desired_depth = ((TARGET_LEN - 1 - initial_cwd_len)
/ (1 + strlen (dir_name)));
for (d = 0; d < desired_depth; d++)
{
if (mkdir (dir_name, S_IRWXU) < 0 || chdir (dir_name) < 0)
{
fail = 3; /* Unable to construct deep hierarchy. */
break;
}
}
/* If libc has the bug in question, this invocation of getcwd
results in a failed assertion. */
cwd = getcwd (NULL, 0);
if (cwd == NULL)
fail = 4; /* getcwd failed. This is ok, and expected. */
free (cwd);
/* Call rmdir first, in case the above chdir failed. */
rmdir (dir_name);
while (0 < d--)
{
if (chdir ("..") < 0)
{
fail = 5;
break;
}
rmdir (dir_name);
}
return fail;
}
]])],
[gl_cv_func_getcwd_abort_bug=no],
dnl A "regular" nonzero return does not indicate this bug.
dnl An abort will provoke an exit code of something like 134 (128 + 6).
[test $? -gt 128 \
&& gl_cv_func_getcwd_abort_bug=yes \
|| gl_cv_func_getcwd_abort_bug=no],
[gl_cv_func_getcwd_abort_bug=yes])
])
AS_IF([test $gl_cv_func_getcwd_abort_bug = yes], [$1], [$2])
])
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