| 1 | # fstatat.m4 serial 4
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| 2 | dnl Copyright (C) 2004-2021 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | # Written by Jim Meyering.
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| 8 |
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| 9 | # If we have the fstatat function, and it has the bug (in AIX 7.1)
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| 10 | # that it does not fill in st_size correctly, use the replacement function.
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| 11 | AC_DEFUN([gl_FUNC_FSTATAT],
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| 12 | [
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| 13 | AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
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| 14 | AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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| 15 | AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
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| 16 | AC_REQUIRE([AC_CANONICAL_HOST])
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| 17 | AC_CHECK_FUNCS_ONCE([fstatat])
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| 18 |
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| 19 | if test $ac_cv_func_fstatat = no; then
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| 20 | HAVE_FSTATAT=0
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| 21 | else
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| 22 | dnl Test for an AIX 7.1 bug; see
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| 23 | dnl <https://lists.gnu.org/r/bug-tar/2011-09/msg00015.html>.
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| 24 | AC_CACHE_CHECK([whether fstatat (..., 0) works],
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| 25 | [gl_cv_func_fstatat_zero_flag],
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| 26 | [AC_RUN_IFELSE(
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| 27 | [AC_LANG_SOURCE(
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| 28 | [[
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| 29 | #include <fcntl.h>
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| 30 | #include <sys/stat.h>
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| 31 | int
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| 32 | main (void)
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| 33 | {
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| 34 | struct stat a;
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| 35 | return fstatat (AT_FDCWD, ".", &a, 0) != 0;
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| 36 | }
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| 37 | ]])],
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| 38 | [gl_cv_func_fstatat_zero_flag=yes],
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| 39 | [gl_cv_func_fstatat_zero_flag=no],
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| 40 | [case "$host_os" in
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| 41 | aix*) gl_cv_func_fstatat_zero_flag="guessing no";;
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| 42 | *) gl_cv_func_fstatat_zero_flag="guessing yes";;
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| 43 | esac
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| 44 | ])
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| 45 | ])
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| 46 |
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| 47 | case $gl_cv_func_fstatat_zero_flag+$gl_cv_func_lstat_dereferences_slashed_symlink in
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| 48 | *yes+*yes) ;;
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| 49 | *) REPLACE_FSTATAT=1 ;;
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| 50 | esac
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| 51 |
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| 52 | case $host_os in
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| 53 | solaris*)
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| 54 | REPLACE_FSTATAT=1 ;;
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| 55 | esac
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| 56 |
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| 57 | case $REPLACE_FSTATAT,$gl_cv_func_fstatat_zero_flag in
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| 58 | 1,*yes)
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| 59 | AC_DEFINE([HAVE_WORKING_FSTATAT_ZERO_FLAG], [1],
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| 60 | [Define to 1 if fstatat (..., 0) works.
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| 61 | For example, it does not work in AIX 7.1.])
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| 62 | ;;
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| 63 | esac
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| 64 | fi
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| 65 | ])
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