X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=m4%2Fgetcwd-path-max.m4;fp=m4%2Fgetcwd-path-max.m4;h=0000000000000000000000000000000000000000;hb=dc84183747ce1703eb99685b5dbde1f65a143c06;hp=ecf6192842e11b38144840c6869d8c02b2c21657;hpb=a2016c1de6e4884f6c8ed5cc498f3bf821c25ca4;p=debian%2Fgzip diff --git a/m4/getcwd-path-max.m4 b/m4/getcwd-path-max.m4 deleted file mode 100644 index ecf6192..0000000 --- a/m4/getcwd-path-max.m4 +++ /dev/null @@ -1,190 +0,0 @@ -# serial 14 -# 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, 2009-2010 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([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 -#include -#include -#include -#include -#include -#include -#include - -#ifndef AT_FDCWD -# define AT_FDCWD 0 -#endif -#ifdef ENAMETOOLONG -# define is_ENAMETOOLONG(x) ((x) == ENAMETOOLONG) -#else -# define is_ENAMETOOLONG(x) 0 -#endif - -/* 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 (1); - - 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 = 2; - 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 (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 = 2; - 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 - 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 -])