# fstatat.m4 serial 4 dnl Copyright (C) 2004-2019 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. # Written by Jim Meyering. # If we have the fstatat function, and it has the bug (in AIX 7.1) # that it does not fill in st_size correctly, use the replacement function. AC_DEFUN([gl_FUNC_FSTATAT], [ AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS]) AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK]) AC_REQUIRE([AC_CANONICAL_HOST]) AC_CHECK_FUNCS_ONCE([fstatat]) if test $ac_cv_func_fstatat = no; then HAVE_FSTATAT=0 else dnl Test for an AIX 7.1 bug; see dnl <https://lists.gnu.org/r/bug-tar/2011-09/msg00015.html>. AC_CACHE_CHECK([whether fstatat (..., 0) works], [gl_cv_func_fstatat_zero_flag], [AC_RUN_IFELSE( [AC_LANG_SOURCE( [[ #include <fcntl.h> #include <sys/stat.h> int main (void) { struct stat a; return fstatat (AT_FDCWD, ".", &a, 0) != 0; } ]])], [gl_cv_func_fstatat_zero_flag=yes], [gl_cv_func_fstatat_zero_flag=no], [case "$host_os" in aix*) gl_cv_func_fstatat_zero_flag="guessing no";; *) gl_cv_func_fstatat_zero_flag="guessing yes";; esac ]) ]) case $gl_cv_func_fstatat_zero_flag+$gl_cv_func_lstat_dereferences_slashed_symlink in *yes+*yes) ;; *) REPLACE_FSTATAT=1 ;; esac case $host_os in solaris*) REPLACE_FSTATAT=1 ;; esac case $REPLACE_FSTATAT,$gl_cv_func_fstatat_zero_flag in 1,*yes) AC_DEFINE([HAVE_WORKING_FSTATAT_ZERO_FLAG], [1], [Define to 1 if fstatat (..., 0) works. For example, it does not work in AIX 7.1.]) ;; esac fi ])