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# readlinkat.m4
# serial 9
dnl Copyright (C) 2009-2025 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.
# See if we need to provide readlinkat replacement.
# Written by Eric Blake.
AC_DEFUN([gl_FUNC_READLINKAT],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
gl_CHECK_FUNCS_ANDROID([readlinkat], [[#include <unistd.h>]])
AC_REQUIRE([gl_FUNC_READLINK])
if test $ac_cv_func_readlinkat = no; then
HAVE_READLINKAT=0
case "$gl_cv_onwards_func_readlinkat" in
future*) REPLACE_READLINKAT=1 ;;
esac
else
AC_CACHE_CHECK([whether readlinkat signature is correct],
[gl_cv_decl_readlinkat_works],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <unistd.h>
/* Check whether original declaration has correct type. */
ssize_t readlinkat (int, char const *, char *, size_t);
]])
],
[gl_cv_decl_readlinkat_works=yes],
[gl_cv_decl_readlinkat_works=no])
])
# Assume readlinkat has the same bugs as readlink,
# as is the case on OS X 10.10 with trailing slashes.
case $gl_cv_decl_readlinkat_works,$gl_cv_func_readlink_trailing_slash,$gl_cv_func_readlink_truncate in
*yes,*yes,*yes)
;;
*)
REPLACE_READLINKAT=1
;;
esac
dnl On Cygwin 3.3.6, readlinkat(AT_FDCWD,"/dev/null") returns
dnl "\\Device\\Null", which is unusable.
case "$host_os" in
cygwin*)
REPLACE_READLINKAT=1
;;
esac
fi
])
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