66 lines
2 KiB
Text
66 lines
2 KiB
Text
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# fstatat.m4 serial 4
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dnl Copyright (C) 2004-2021 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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# Written by Jim Meyering.
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# If we have the fstatat function, and it has the bug (in AIX 7.1)
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# that it does not fill in st_size correctly, use the replacement function.
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AC_DEFUN([gl_FUNC_FSTATAT],
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[
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AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
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AC_REQUIRE([AC_CANONICAL_HOST])
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AC_CHECK_FUNCS_ONCE([fstatat])
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if test $ac_cv_func_fstatat = no; then
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HAVE_FSTATAT=0
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else
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dnl Test for an AIX 7.1 bug; see
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dnl <https://lists.gnu.org/r/bug-tar/2011-09/msg00015.html>.
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AC_CACHE_CHECK([whether fstatat (..., 0) works],
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[gl_cv_func_fstatat_zero_flag],
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[AC_RUN_IFELSE(
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[AC_LANG_SOURCE(
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[[
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#include <fcntl.h>
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#include <sys/stat.h>
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int
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main (void)
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{
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struct stat a;
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return fstatat (AT_FDCWD, ".", &a, 0) != 0;
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}
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]])],
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[gl_cv_func_fstatat_zero_flag=yes],
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[gl_cv_func_fstatat_zero_flag=no],
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[case "$host_os" in
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aix*) gl_cv_func_fstatat_zero_flag="guessing no";;
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*) gl_cv_func_fstatat_zero_flag="guessing yes";;
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esac
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])
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])
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case $gl_cv_func_fstatat_zero_flag+$gl_cv_func_lstat_dereferences_slashed_symlink in
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*yes+*yes) ;;
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*) REPLACE_FSTATAT=1 ;;
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esac
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case $host_os in
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solaris*)
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REPLACE_FSTATAT=1 ;;
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esac
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case $REPLACE_FSTATAT,$gl_cv_func_fstatat_zero_flag in
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1,*yes)
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AC_DEFINE([HAVE_WORKING_FSTATAT_ZERO_FLAG], [1],
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[Define to 1 if fstatat (..., 0) works.
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For example, it does not work in AIX 7.1.])
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;;
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esac
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fi
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])
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