| 1 | # fstatat.m4 serial 3 |
| 2 | dnl Copyright (C) 2004-2014 Free Software Foundation, Inc. |
| 3 | dnl This file is free software; the Free Software Foundation |
| 4 | dnl gives unlimited permission to copy and/or distribute it, |
| 5 | dnl with or without modifications, as long as this notice is preserved. |
| 6 | |
| 7 | # Written by Jim Meyering. |
| 8 | |
| 9 | # If we have the fstatat function, and it has the bug (in AIX 7.1) |
| 10 | # that it does not fill in st_size correctly, use the replacement function. |
| 11 | AC_DEFUN([gl_FUNC_FSTATAT], |
| 12 | [ |
| 13 | AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS]) |
| 14 | AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) |
| 15 | AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK]) |
| 16 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles |
| 17 | AC_CHECK_FUNCS_ONCE([fstatat]) |
| 18 | |
| 19 | if test $ac_cv_func_fstatat = no; then |
| 20 | HAVE_FSTATAT=0 |
| 21 | else |
| 22 | dnl Test for an AIX 7.1 bug; see |
| 23 | dnl <http://lists.gnu.org/archive/html/bug-tar/2011-09/msg00015.html>. |
| 24 | AC_CACHE_CHECK([whether fstatat (..., 0) works], |
| 25 | [gl_cv_func_fstatat_zero_flag], |
| 26 | [AC_RUN_IFELSE( |
| 27 | [AC_LANG_SOURCE( |
| 28 | [[ |
| 29 | #include <fcntl.h> |
| 30 | #include <sys/stat.h> |
| 31 | int |
| 32 | main (void) |
| 33 | { |
| 34 | struct stat a; |
| 35 | return fstatat (AT_FDCWD, ".", &a, 0) != 0; |
| 36 | } |
| 37 | ]])], |
| 38 | [gl_cv_func_fstatat_zero_flag=yes], |
| 39 | [gl_cv_func_fstatat_zero_flag=no], |
| 40 | [case "$host_os" in |
| 41 | aix*) gl_cv_func_fstatat_zero_flag="guessing no";; |
| 42 | *) gl_cv_func_fstatat_zero_flag="guessing yes";; |
| 43 | esac |
| 44 | ]) |
| 45 | ]) |
| 46 | |
| 47 | case $gl_cv_func_fstatat_zero_flag+$gl_cv_func_lstat_dereferences_slashed_symlink in |
| 48 | *yes+*yes) ;; |
| 49 | *) REPLACE_FSTATAT=1 |
| 50 | case $gl_cv_func_fstatat_zero_flag in |
| 51 | *yes) |
| 52 | AC_DEFINE([HAVE_WORKING_FSTATAT_ZERO_FLAG], [1], |
| 53 | [Define to 1 if fstatat (..., 0) works. |
| 54 | For example, it does not work in AIX 7.1.]) |
| 55 | ;; |
| 56 | esac |
| 57 | ;; |
| 58 | esac |
| 59 | fi |
| 60 | ]) |