diff options
Diffstat (limited to 'm4/getcwd-path-max.m4')
| -rw-r--r-- | m4/getcwd-path-max.m4 | 217 |
1 files changed, 0 insertions, 217 deletions
diff --git a/m4/getcwd-path-max.m4 b/m4/getcwd-path-max.m4 deleted file mode 100644 index 6d58d69d..00000000 --- a/m4/getcwd-path-max.m4 +++ /dev/null @@ -1,217 +0,0 @@ -# serial 19 -# 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) 2003-2007, 2009-2017 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_CHECK_DECLS_ONCE([getcwd]) - AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles - AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) - AC_CHECK_HEADERS_ONCE([unistd.h]) - AC_REQUIRE([gl_PATHMAX_SNIPPET_PREREQ]) - 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" - dnl Please keep this in sync with tests/test-getcwd.c. - AC_RUN_IFELSE( - [AC_LANG_SOURCE( - [[ -#include <errno.h> -#include <stdlib.h> -#if HAVE_UNISTD_H -# include <unistd.h> -#else -# include <direct.h> -#endif -#include <string.h> -#include <limits.h> -#include <sys/stat.h> -#include <sys/types.h> -#include <fcntl.h> - -]gl_PATHMAX_SNIPPET[ - -#ifndef AT_FDCWD -# define AT_FDCWD 0 -#endif -#ifdef ENAMETOOLONG -# define is_ENAMETOOLONG(x) ((x) == ENAMETOOLONG) -#else -# define is_ENAMETOOLONG(x) 0 -#endif - -/* Use the getcwd function, not any macro. */ -#undef getcwd - -/* Don't get link errors because mkdir is redefined to rpl_mkdir. */ -#undef mkdir - -#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 () -{ -#ifndef PATH_MAX - /* The Hurd doesn't define this, so getcwd can't exhibit the bug -- - at least not on a local file system. And if we were to start worrying - 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 / (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 * (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 (10); - - cwd_len = initial_cwd_len = strlen (cwd); - - while (1) - { - 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) - { - if (! (errno == ERANGE || is_ENAMETOOLONG (errno))) - fail = 20; - break; - } - - if (PATH_MAX <= cwd_len && cwd_len < PATH_MAX + DIR_NAME_SIZE) - { - struct stat sb; - - c = getcwd (buf, PATH_MAX); - if (!c && errno == ENOENT) - { - fail = 11; - break; - } - if (c) - { - fail = 31; - break; - } - if (! (errno == ERANGE || is_ENAMETOOLONG (errno))) - { - fail = 21; - break; - } - - /* Our replacement needs to be able to stat() long ../../paths, - so generate a path larger than PATH_MAX to check, - avoiding the replacement if we can't stat(). */ - c = getcwd (buf, cwd_len + 1); - if (c && !AT_FDCWD && stat (c, &sb) != 0 && is_ENAMETOOLONG (errno)) - { - fail = 32; - break; - } - } - - 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 = 22; - break; - } - if (AT_FDCWD || errno == ERANGE || errno == ENOENT) - { - fail = 12; - break; - } - } - } - - if (c && strlen (c) != cwd_len) - { - fail = 23; - break; - } - ++n_chdirs; - } - - /* Leaving behind such a deep directory is not polite. - So clean up here, right away, even though the driving - shell script would also clean up. */ - { - size_t i; - - /* Try rmdir first, in case the chdir failed. */ - rmdir (DIR_NAME); - for (i = 0; i <= n_chdirs; i++) - { - if (chdir ("..") < 0) - break; - if (rmdir (DIR_NAME) != 0) - break; - } - } - - exit (fail); -#endif -} - ]])], - [gl_cv_func_getcwd_path_max=yes], - [case $? in - 10|11|12) gl_cv_func_getcwd_path_max='no, but it is partly working';; - 31) gl_cv_func_getcwd_path_max='no, it has the AIX bug';; - 32) gl_cv_func_getcwd_path_max='yes, but with shorter paths';; - *) gl_cv_func_getcwd_path_max=no;; - esac], - [case "$host_os" in - aix*) gl_cv_func_getcwd_path_max='no, it has the AIX bug';; - *) gl_cv_func_getcwd_path_max=no;; - esac]) - ]) -]) |